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Color LaserWriter 12/600 PS

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2. j 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Transfer Drum Cleaning Assembly page 3 of 4 3 Unlock the lock lever at the left end of the assembly Lever 95 08 24 14 49 Color LaserWriter 12 600 PS Take Apart Transfer Drum Cleaning Assembly page 4 of 4 4 Slide the assembly to the left and pull it out of the printer 95 08 24 14 54 Color LaserWriter 12 600 PS Take Apart High Voltage Separation Assembly page 1 of 3 First Remove the I O controller board top cover left cover rear cover rear shield plate fuser fan and mechanical controller mount and board Now 1 Remove the three brass colored terminal contact screws the brass colored screw that secures the assembly to the chassis and the silver colored grounding screw Remove the contact cables from their guides and clamps High Voltage Separation Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart High Voltage Separation Assembly page 2 of 3 Note For clearance purposes you must loosen the I O board housing so that you can perform step 3 2 Remove
3. CPFED IC302 5 I AO_ J304 6 6 3 A 5 ae BS 3 Pickup M ickup Motor 17 18 CA gt p CB 1 5V 24V J303 2 Cassette Feed 1 SL1 5V it 24V MPFED Solenoid J302 6 Manual Feed S Solenoid 1 l ad N 5V 7 J302 9 H toy Registrati REGFED gistration 10 Roller Clutch 5V DC Controller Board MPSSNS Mechanical Controller Board MPPSNS f REGSNS LEDDRV TOPSNS PS302 P S J302 1 Manual Feed 3 Paper Width PS2 Sensor J302 4 Manual Feed 6 Paper Present psgq Sensor Paper Registration Sensor Cassette Paper Present Sensor PS301 Paper Leading Edge Sensor PS303 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Pickup Motor The pickup motor is a two phase stepping motor located in the pickup Drive Circuit block This motor drives the cassette pickup roller the manual feed pickup roller the separation roller the registration roller feed rollers 1 and 2 and the paper lifting plate press cam The pickup motor is controlled by the pickup motor driver IC302 on the cassette pickup board C302 sets the pickup motor drive signal to L to drive the main motor 0 2 second after starting it C302 selects the rotational speed as the normal speed the initial speed or the grip speed Grip speed is one third of normal speed Cass
4. F F F F F F F F F none none none none none Low Magenta Low Cyan Low Yellow Low Black No Magenta Cartridge No Cyan Cartridge No Yellow Cartridge No Black Cartridge Low Fuser Oil Toner Disposal Box Full Photoconductor Warning Photoconductor End of Life No Cleaning Web No Photoconductor No Fuser Oil No Fuser Assembly 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting EPOST Codes Matrix 2 of 2 P 2 Flashing With Test Plug Toner Access Maintenance Error Lights Lights Lights Designation none none Pickup Block Door Jam none none Front Door Jam none none Fuser Door Jam none none Top Access Door Jam none none Pre Registration Jam none none Leading Edge Jam none none Transfer Grip Jam none none Transfer Drum Jam none none Paper Delivery Jam 4 99 lye Access Lights 6 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting POST Codes Notes Note 1 Note 2 Note 3 Note 4 The notes below correspond to the POST Codes Matrix earlier in this topic Over the phone denotes actions that you can ask a customer to take to help you isolate faults remotely On site denotes actions you take after you have arrived Importa
5. Voltage oes ON OFF Voltage Sireuit Circuit Detection A 4 DEVDC Switching DC Bias Circuit gt Generation _ Regulator HVFre1 TIT Circuit HVFre1 3 are pulse signals 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Voltage to The transfer drum is charged with print bias and between colors bias Transfer Drum according to each print sequence For print bias positive voltage is applied to the transfer drum in order to transfer the toner on the photosensitive drum surface onto the paper High Voltage Power Supply Attraction Roller Voltage Generation Circuit i Constant Voltage Circuit Discharge ATRPWM Ni Poller ES l i i Voltage i Detection i Circuit HVFre1 gt Attraction Roller HVATR i pale Voltage Generation gt i vent Circuit Attraction i 1 Roller AREE E EEE E ESE E EE beza RPWM Integral Circuit A g Constant Voltage Circuit p ters a gt o o i ira T i 3 Be i 5 z g Voltage i 8 2 Detection i o 1 3 gt Circuit 2 5 HVTR T Switch Transfer Roller 2 HVEre1 Circ
6. 5V L4 gI Euser TH oller K 5 TIT Thermistor IC101 T K FXUON CPU FXLON FXENB gt Fuser Heater Fuser Heater Drive Circuit FXSEL TH Safety Circuit 1 102 THI When the DC controller outputs the fuser temperature control enable signal FXENB to the fuser heater safety circuit it controls the fuser temperature The microcomputer CPU on the DC controller controls the fuser heater drive signals FXUON and FXLON so as to maintain the fuser temperature at the specified value based on the voltage of the THI signal 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Target Temperature Fuser Temperature The printer starts to raise the fuser temperature while it is in the wait period and when the temperature reaches the target value the printer enters the standby state Note If the fuser temperature reaches the target value while image quality stability control and toner cartridge detection are still in progress the printer will not enter the standby state If the fuser temperature is 100 C or lower when it starts to rise the target temperature is set to a value higher than the normal one After a certain period of time the value is returned to the normal target temper ature WAIT STANDBY PRINT STANDBY 0 C 95 08 23 11 30 Color LaserWriter 12 600 PS Basics am
7. When the primary POST error array occurs some combination of secondary lights also illuminates This secondary array isolates the error designation to the module or piece part level To decipher the meaning of the secondary lights ask yourself two questions which lights are on to the left of the graphic and how many lights are on to the right of the graphic Then refer to the matrix to see what service action is required 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Extended POST EPOST Initiating EPOST Some error conditions that stop printer operation cannot be detected within the short period of time that POST runs When this occurs the status panel flashes all four primary lights anag POST Undetected Error To identify the specific error condition that is causing the all flashing array you must restart the printer under Extended POST EPOST This mode simply extends the amount of time given to the testing so that all errors are detectable It also reports on jams and consumables See EPOST Codes Matrix later in this topic Whereas POST messages can be relayed to you by the customer over the phone EPOST requires that you be at the printer To initiate EPOST you must have the printer loopback test plug P N 922 1489 This test plug is colored bright green to differentiate it from the older version black plug Do not use the black plug on the Color LaserWriter 12 600 PS
8. Exploded View 922 1318 922 1306 Top Access 661 0217 922 1301 Filter Cover Door Cover Hard Drive 240 MB vesi Rear amp 922 1307 922 1494 VO Bracket 922 1350 COV is Hard Drive Bracket y 1 0 Controller 1 Fan _ amp FM3 922 1303 661 1701 1 ESS Top Cover SIMM E SN 661 013 922 1302 V O Controller Bd Left Cover PETE S Q Z 1 0 Interconnect Bd oe SS Self a Sy LES sh 922 1590 922 1348 j Ozone Fuser Fan FM 922 1349 922 1562 ie 922 1354 Main Density Control 661 0899 Separation Discharge Fan FM2 Panel Mechanical Assy 922 1387 Status Panel 922 1310 922 1610 Controller Ba 922 1715 Status Panel Cover Density 661 0905 Separation A Sensor Assy H V eparatio a 661 0898 DC Controller Board Power Supply Assy a of eae 922 1316 922 2220 Density Sensor Link Arm ee Carousel N Manual 661 0902 Laser Scanner Ass y Rotary Assy 922 1369 1 922 1298 R 1 Toner 922 1338 Carousel Attraction 922 1714 Interlock Roller Drive Transfer i Assy fs 922 1308 B mee a IA Toner Sensor Z 922 1341 a y Main 661 0903 Wr Holder Sy Delivery aca 334 Motor Power i Drive Sa rinter Supply 110 V AR A Drive Assy 661 0904 922 1580 922 1294 gt E 3 Lath 337 Power Photoconductor Cassette iScnarge Supply 220 V Tray Size Cover Roller Drive 922 1336 Assy Photoconductor xGyy Z Cleaning Cartridge _ Ze 3 a 922 1340 S s Paper Delivery Assy 661 0900 Fuser Assem
9. since their potential is higher than the charge of toner particles on the developing cylinder The laser beam irradiated area on the photosensitive drum is higher in potential than the toner negatively charged on the cylinder When this area comes close to the negatively charged toner on the cylinder the toner jumps and adheres to the drum surface due to the difference in potential between the drum surface and the cylinder This effect is called toner projection development and makes the elec trostatic latent image on the photosensitive drum surface visible AC bias is applied to the developing cylinder for ease of projecting toner to the photosensitive drum surface and in order to improve the contrast of the output image DC bias varies in response to density cali bration and the operation of the density control panel 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Stage 3 Photosensitive Drum Cleaning Step 4 During the transfer stage a small amount of toner does not transfer onto Photosensitive the paper To prepare for the next imaging cycle the toner remaining on Drum Cleaning the photosensitive drum surface is scraped by the cleaner blade and the drum is cleaned The scraped toner particles are trapped with the sweeper strip and collected in the toner disposal box by means of the toner transport plate and the waste toner transport screw The waste toner transport screw is driven by the main motor
10. 1 of 2 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Cassette Pickup Assembly Board page 1 of 4 Remove the paper pickup block The cassette pickup assembly board is a part of the cassette pickup assembly but is also available separately as P N 922 1311 All func tions of the paper pickup block route through this board This board contains the photo reflectors for the cassette paper present sensor PS301 and paper leading edge sensor PS303 and the photo interrupter for paper registration sensor PS302 Set the pickup block flat on its cover so that the two bullet shaped posi tioning rods are pointing straight up 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Cassette Pickup Assembly Board page 2 of 4 2 Remove the three silver colored screws that secure the shield to the pickup block and lift the shield from the block 2 Shield 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Cassette Pickup Assembly Board page 3 of 4 3 Disconnect J301 from the pickup board and remove the two silver colored screws that secure the receptacle bracket to the pickup block Remove the bracket and cable from the pickup block J301 1 2 Receptacle Bracket 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Cassette Pickup Assembly Board page 4 of 4 4 Disconnect connectors J302 J303 and J304 and remove the two silver colored screws Carefully remove the
11. Note J2010 is the wide ribbon cable at the top of the mechanical controller board J2010 J2007 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart DC Controller Board page 3 of 5 2 Remove the seven silver colored screws that secure the I O board housing to the chassis Disconnect connectors J802 and J804 from the T O interconnect board and remove the cable from the cable clamp I O Board Housing 4 5 6 Guide Replacement Note When replacing the I O board housing make sure to thread the ribbon cable through the ferrite guide 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart DC Controller Board page 4 of 5 3 Pull the fan cable under the density control panel bezel and lift the I O board housing from the printer not shown in photo Remove the two brass colored screws that secure the black cable guide to the chassis Disconnect connectors J101 J102 and J103 at the cable guide and remove the cable guide from the printer Cable Guide P Replacement Note Make sure to seat the cable guide firmly into the two cutouts in the chassis 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart DC Controller Board page 5 of 5 4 Remove all the remaining connectors and the four silver colored screws and remove the DC controller board from the printer Note J108 and J112 have a clampless socket style fitting If you are removing the board only to get to the laser scanner assembl
12. Therefore this sensing circuit uses the density sense mode select signal DSEL to switch between the colored toner density sensing mode and the black toner density sensing mode When the density sense enable signal DENB goes L the LED emits light with the intensity provided by the LED power control signal DO 7 The photodiode senses the light which is reflected by the density sensing pattern on the transfer drum The density sensing board outputs the density to the DC controller as the toner sensor signal DSNS DC Controller Board Density Sensing Board IC101 DENB Calibration Density Sensor PS14 DO to 7 Density Sensing Receiver Emitter Circuit DSEL DSNS 4 Note Ifthe DC controller determines that sensor PS14 is blocked it will still allow printer operation to continue but will default to factory density settings 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory V Pickup Feed System Color LaserWriter 12 600 PS Basics amp Theory Outline When the PRNT signal is sent to the DC controller by the I O controller and the scanner motor is put in the ready state the DC controller issues the print sequence command to the mechanical controller which then starts printing After a sheet of paper is picked up by either the cassette or the manual feed pickup rollers the feed rollers advance it to the registration roller which corrects any skew
13. 2 o 5 to c 2 en Oo O D 2 a 2 ao ko E 2 wa a va 5 2 5 lt 4 3 5 e a 9 o o z lp g z 5 a 2 S D g 2 T S SL5 a 2 x a Separation Claw Cleaning Brush Press Cam Cleaning brush 2 Discharge Roller Press Cam Attraction Roller Press Cam Discharge Roller Roller 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory When the paper cued at the paper leading edge sensor PS303 begins feeding the gripper drive signal GRIPON goes H and the gripper drive solenoid SL4 is turned on to open the gripper on the transfer drum The paper is then fed 1 3 times faster than the transfer drum speed so that its leading edge will be pushed into the opened gripper When the leading edge of the paper reaches the gripper SL4 is turned off and then the gripper is closed to clamp the paper top Simultaneously the attraction roller press signal ATTSLON turns L and the attraction roller press solenoid SL6 is turned on when the separation claw drive signal SEPON goes H in order to actuate the press cam to press the attraction roller against the transfer drum Attraction roller voltage is applied to the attraction roller while the paper is passing through it This gives negative electric charge to the surface of the transfer drum and thus the paper is electrostatically attracted by that surface After ton
14. 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Bottle page 2 of 2 Note There is a mechanism in the lid of the bottle that automatically cuts off flow of oil when the bottle is removed from the printer However some oil might still drip Be sure to keep the bottle upright and protected by a paper towel as you continue servicing the printer If any fuser oil spills on the floor clean it up immediately The oil is very slippery on hard surfaces 95 08 23 09 16 i Sy Q lt co x H Color LaserWriter 12 600 PS Fuser Assembly page 1 of 3 Remove the fuser access cover and fuser oil bottle Open the pickup block door if it is not already open First 1 Loosen the two large locking screws at the base of the fuser assembly Now These screws do not come off 7 A ak i ast i X As SWI y Ri o n E N toe ka UI i ee PY 95 08 23 09 16 i Q lt 0 x He Color LaserWriter 12 600 PS Fuser Assembly page 2 of 3 2 Grasp the two knobs and slide the fuser assembly outward 72 D e c a AST J Tae i A n EAL LS 95 08 23 09 16 S Q lt 5 x He Color LaserWriter 12 600 PS Fuser Assembly page 3 of 3 3 Grasp the two green handles and remove the fuser assembly from the printer oz Important If you are replacing the fuser
15. Description of When the print sequence command is received the CPU Q2001 in the Operation mechanical controller sets the main motor drive signal to L to drive the main motor The mechanical controller monitors the main motor ready signal MRDY to check whether the main motor is rotating at the specified speed If the main motor operates at any speed other than the specified value the MRDY signal becomes L If the MRDY signal goes L for two seconds or more continuously the CPU will determine that a main motor failure has occurred In the transparency mode the CPU sets the main motor rotation rate select signal MLOW to H to slow down the rotational speed to half that normal and thus improve the fusibility Unit Second Unit Second PRINT PRINT TS Registration Position Registration Position Transfer Drum Top Sensor PS8 Jam Check Separation Sensor PS7 Main Motor M2 T4 3 4 5 3 in case of overhead transparencies 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Outline Paper Jam Detection The following paper sensors are provided to detect whether paper is present and whether the paper is fed normally PS301 Cassette paper present sensor located on the cassette pickup assembly board PS302 Paper registration sensor located on the cassette pickup assembly board PS303 Paper leading edge sensor located on the cassette pickup
16. First Remove the cassette Now Remove the two brass colored screws and remove the rear cover from the sheet feeder Rear Cover 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Left Cover First Remove the cassette front cover and rear cover Now Remove the two brass colored screws and remove the left cover from the sheet feeder Left Cover 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Right Corner Cover First Remove the cassette and front cover Now Remove the brass colored screw and lift the right corner cover from the sheet feeder Screw Right Corner Cover 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Side Access Cover page 1 of 2 First Remove the cassette Now 1 Open the side access cover Remove the two E rings that hold the hinge pins to the pickup block Side Access Cover 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Side Access Cover page 2 of 2 2 While holding the metal bracket in place remove the black screw that holds the metal bracket to the cover Press the black tabs and slide the two white plastic hinge arms off the pickup block Free the side access cover from its hinge pins and remove it from the sheet feeder Hinge Arm a Te a Screw and Hinge Arm Bracket a D 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder
17. Magenta cceseseeeeteeeteeees M3760G A Color LaserWriter Toner Cartridge Yellow ccceeceeeeeseeeeteeeneeees M3758G A Color LaserWriter Toner Cartridge Black cccesceesesseeeeteeeeeees M3756G A Color LaserWriter 12 600 PS 250 Sheet Feeder cccceseeeeeeeee M3762G A Color LaserWriter 12 600 PS Universal Cassette cceeereeee M3874G A Color LaserWriter 12 600 PS Internal Hard Disk Drive M3875G A Color LaserWriter Photoconductor Replacement Kit eeeeeee M3761G A 110 V Color LaserWriter Fuser Replacement Kit cceeeeeeeeeees M3867G A 220 V Color LaserWriter Fuser Replacement Kit ccceeeeeereeee M4234G A Color LaserWriter 12 600 PS 16MB Memory Expansion Kit M4255LL A Color LaserWriter Fuser Oil ccccceceeeseeeeeeeeeeeeeeseeeeeeeeeeeseeeenaeeeea M3755G A Color LaserWriter Transparencies A4 ccceeceeeteeseeeeeeeeeeeeeneeeneeeees M3877G A Color LaserWriter Transparencies Letter ccceceeseeeeeeeeeeeeeeees M3876G A Apple HDI 30 SCSI Cable ec eceesceseeeeseeeeeeeeeeeeeaeeeeeeteaeeteeeteaeen M2538LL A Apple Ethernet Thin Coax Transceiver 0 eceeeeeeeeeeeeee terete MO329LL A Apple Ethernet Twisted Pair Transceivet cccccccccceeeeeesteeeeeetees M0437LL A Apple Ethernet AUI Adapter ec eeceesesceeeeseeeeeeeeeeeeeeeeeeeeeenatereaas M0432LL A Apple 1284 Parallel I O Cable ceecseseseeeeeee
18. The paper then feeds a short distance to the leading edge detection position where it pauses to synchronize with the rotation of the transfer drum The paper then continues through the transfer separation and fuser and is delivered to the face down or face up tray Face down Delivery Roller Face Down Tray a e Upper Fuser Roller L Face Up Tray hotosensitive Drum X Separation Claw X Lower Fuser Roller O Cleaning Brush Discharge Roller Manual Feed Pickup Roller f ripper 7 Registration Roller a Manual Feed Tray Attraction Roller Leading Edge Detection Position Cassette Pickup Roller Feed Roller Cassette i Separation Roller 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Cassette Feeding Paper Pickup When the print sequence command is received the mechanical controller drives the main motor M2 and 0 2 second later also drives the drum motor M4 and the pickup motor M1 Simultaneously the pickup solenoid SL1 is turned on and the drive of the pickup motor is transferred to the pickup roller feed rollers and separation roller After any multifeed pickup is eliminated by the separation roller the paper is fed into the printer by the rotations of feed rollers 1 and 2 Mechanical Controller Board f Cassette Pickup Board TOPREG A 2 a a fe E Signal CPFED al REGFED Pickup Motor Drive Sign
19. Theory Multifeed For cassette feeding the printer uses the separation roller to prevent Prevention multifeeding Normally the separation roller is given rotational force Mechanism reverse that of the feed roller However since the separation roller is equipped with a torque limiter it rotates with the feed roller by trans mission of its rotational force via the transported paper If multiple sheets of paper are picked up the low friction force between those sheets results in a weak rotational force being transmitted to the separa tion roller from the feed roller As a result the separation roller s own rotational force separates the extra sheet Feed Roller 2 Feed Roller 1 Separation Roller Rotational force transmitted from feed roller gt Rotational force transmitted from pickup motor via torque limiter A gt Rotational force of feed roller gt Paper feed direction Normal Feed wee Rotational force Feed roller transmitted from Q feed roller Paper Pad Separation roller Rotational force transmitted from pickup motor Multiple feed via torque limiter 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Manual Feeding The presence of paper in the manual feed tray is detected by the manual feed paper present sensor PS1 Upon receiving the print sequence command the mechanical controller drives the main motor M2 and 0 2 second later also drives the drum motor
20. Transfer lt a Flow of Paper lt t Direction of Photosensitive Drum Rotation 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Stage 1 Electrostatic Latent Image Formation This stage consists of two steps primary charging and scanning expo sure Upon completion of this stage the points on the drum that are struck by a laser beam have their charge neutralized while those points not struck remain negatively charged The image that is irradiated onto the drum in this manner is invisible and is therefore referred to as a latent image 0 1 400 aa 3 5004 Dark area Primary Scanning Transfer Primary Charging Exposure Step 6 Charging Step 1 Step 2 Step 1 Surface Electric Potential V 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 1 As a preliminary step in forming the latent image the surface of the Primary photosensitive drum is uniformly charged with negative potential The Charging primary charging is done by directly imparting charges onto the photo sensitive drum In order to keep uniform the surface potential charged on the surface of the photosensitive drum AC bias is superimposed on the primary charging roller in addition to the DC bias The AC bias current value varies according to the values sensed for temperature and humidity to prevent toner from adhering to the charging roller 7 Primary Cha
21. amp Theory 1 111 When the registration position for the fourth color in the full color mode or the first registration position in the monochrome mode is detected on the transfer drum the mechanical controller turns on the fuser assembly drive clutch CL4 This transmits the rotation of the main motor to the upper and lower fuser rollers the fuser delivery roller the oil applying roller and the oil pump The upper and lower fuser rollers each have one built in fuser heater H1 485 W 100 120V 430W 220 240V that heats the roller The fuser temperature is detected by the thermistor TH at the center of the lower roller surface The thermoswitches are in contact with the respective shafts of the upper and lower fuser rollers Upper Fuser Roller Thermoswitches Thermistor Lower Fuser Roller 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Transparency Mode The fusing characteristics of overhead transparencies are poorer than that of normal paper To improve the fusibility the feed speed for a transparency is slowed down to half that of normal paper while the transparency is passing through the fuser assembly The distance between the transfer drum and the fuser assembly is short So the trailing edge of the transparency would still be on the transfer drum when the leading edge has reached the fuser assembly If the rotational speed of the fuser roller were slowed down to half its normal speed witho
22. and remove the assembly from the printer Carousel Interlock 3 4 Support 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Carousel Interlock First Remove the top cover left cover rear cover rear shield plate mechan ical controller mount and board main fan and carousel manual rotary assembly Now Remove the E ring and slide the interlock off the shaft Toner Carousel Interlock E Ring 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart First Now Toner Carousel Assembly page 1 of 5 Remove the toner disposal box photoconductor cartridge toner cartridges front door inner panel 1 toner carousel guide panel top cover left cover rear cover rear shield plate mechanical controller mount and board main fan carousel manual rotary assembly and posi tion sensor assembly Remove the two brass colored screws and lift the developing bias contact holder off the chassis Developing Bias Contact Holder 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Carousel Assembly page 2 of 5 Replacement Note Make sure to install the rocker pin so that the end with the rectangular tip seats in the cutout at the bottom of the devel oping bias contact Developing Rocker Pin Bias Contact Note The press drive gear actuates this rocker pin during cartridge press to complete the developing bias circuit into the toner cartridge 95 08 23 09 18 Co
23. draw the oil into the syringe Inject the oil into the reservoir of the replacement fuser assembly Repeat this step until there is no residual oil left in the bottom of the reservoir Stopper the reservoir on the old assembly with the sealing block that is provided Oil Reservoir 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Extraction page 4 of 5 Extraction from the overflow pan An oil overflow condition is sensed when a float type actuator in the overflow pan breaks the photo interrupter of sensor PS10 The oil that is buoying the actuator can be extracted from the overflow pan though a well located on the delivery side of the fuser assembly 2 Elevate the gear end of the fuser assembly so that oil flows toward the well Remove the well cover and well cap Well Cover Well Cap Well 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Extraction page 5 of 5 3 Insert the syringe into the center ring of the well and draw the oil into the syringe Repeat this step until there is no residual oil left in the overflow pan Replace the well cap and well cover 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart First Now Paper Pickup Block Removal page 1 of 2 No first steps are required This procedure covers the removal of the pickup block from the printer The Paper Pickup Block Disassembly topic that follows this topic describes the breakdown of the
24. inner housing until it clicks into place and cannot turn any more Load each toner cartridge into its corresponding bay Note If you cannot install a cartridge make sure that its sealing tape is removed and that you are installing the cartridge according to the instructions in the user guide After you load the fourth cartridge advance the carousel manually another half revolution to assure that the fourth cartridge is installed correctly Make sure that the fuser oil bottle is installed and that the oil bottle clamp is in an up position Load the cassette tray with paper that is approved for use in this printer and install the cassette into the printer Raise the transfer drum lever and close the front door Close the pickup block door and fuser access door if they are open If you have just run EPOST remove the loopback test plug from the VO controller board 10 Plug in the printer 11 If you are on site with a Macintosh connect the Macintosh to the AppleTalk connector on the I O controller board 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Required Recommended Tools The following tools are required for servicing the Color LaserWriter 12 600 PS printer e PowerBook computer with AppleTalk connectors e Color LaserWriter Service Utility with diagnostic interface cable e Digital multimeter e Phillips screwdriver various sizes e Medium size flat blade screwdriver e Precision flat blade
25. internal signal in the laser scanner assembly output from the PWM IC the laser driver circuit turns the laser diode on or off to produce the modulated laser beam External Device 1 0 Controller Board LSYNC MOP VDO 0 7 IMCHR PRNT LLCNT PDIN M1 M8 Dv2 Dv9 VDOENB LSON SCNON DC Controller Board Cylindrical Collimator Lens Laser Driver Lens Board Photosensitive Drum Reflecting Mirror o BD Board The modulated laser beam is converted to a parallel beam with the collimator lens and cylindrical lens and the beam then strikes the scan ning mirror which is rotating at a constant speed The laser beam reflected by the scanning mirror focuses on the photo sensitive drum after passing through the focusing lens and being reflected by the reflecting mirror Since the scanning mirror rotates at a constant speed the laser beam scans at a constant speed across the photosensitive drum which also rotates at a constant speed As a result a latent image is formed on the photosensitive drum Example The laser beam comes on in frame 62 for the magenta layer The scanner mirror projects it right to left off the reflecting mirror which projects it downward and to the right onto the surface of the photosensitive drum 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory 1 33 Video Data Processing The video data supplied by the I O controller is composed of 8 bit video signals
26. 161003 Separation DC Voltage i Generation Circuit j High HVSEP_ 1 gt voltage E Switching Circuit DC J1004 6 Control Circuit Voltage Ho IC ANE ni Generation i v Eee bee seeec tence betters oO je faa 5 High Voltage Separation Assembly J1505 c Dra ra Poe eee Ee aN a Sehr eee eee pr Ip eet eae ot at T 1 8 Separation AC Voltage Generation Circuit i 8 ao 1 1 g Overcurrent i 2 Protective Circuit J1506 Fuser i o gt z j y Assembly Switching Circuit AC Voltage HVSEPAC i r gt T Constant Voltage gt Generation gt D T Separation ae Circuit Circuit Discharge i Assembly i Voltage 1 Detection Circuit i HVFre 1 is a pulse signal 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Outline Drum Thickness Detection Photosensitive Drum Life Detection The printer determines the life of the photosensitive drum mathemati cally by tracking page count When a new photoconductor cartridge is installed the EEPROM on the DC controller board logs the current page count of the printer This value becomes the starting page count for that photoconductor During each subsequent print the controller compares the running page count against the starting page count stored in EEPROM If the difference between the two values reaches a prescribed number the controller determines that end of life has occurred and instructs the I O controller to report the
27. 17 Color LaserWriter 12 600 PS Take Apart I O Controller Fan FM3 page 2 of 2 2 Remove the brass colored screw and the four flex type tabs that secure the fan duct to the I O board housing Remove the fan and duct from the printer then remove the fan from the grounding plate and duct Screw Tabs Replacement Note Install the fan with the vendor label facing out 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart I O Interconnect Shield page 1 of 2 First Remove the front door top cover and status panel bottom cover Now 1 Remove the nine silver colored screws that secure the I O interconnect shield to the chassis I O Interconnect Shield 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart I O Interconnect Shield page 2 of 2 2 Lift the shield and status panel housing and disconnect J803 on the I O interconnect board Remove the shield and housing from the printer Right Slot J803 Left Slot Replacement Note Two small claws on the I O interconnect shield mate into slots in the chassis If the left slot is not rectangular you may need to flatten the left claw prior to reinstallation to assure a tight fit between shield and chassis Note that there is a ribbon cable grounding pad beneath the flange so you will not get a familiar metal to metal fit 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Density Control Panel First Remove top cover left cover rear cov
28. A L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge A L_ Ge Ge _ L_ Ge Ge A L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge t Ff FF FF F FF F FF F FF t t Ft FF t H E HF FF F FF OF 1 O Controller Board RAM SIMM 1 J11 RAM SIMM 2 J10 Hard Drive ROM Checksum Fuser Assembly Fuser Oil Pump Temp Humidity Sensor Paper Pickup Block Calibration Density Sensor DC Controller Board Power Supply Toner Carousel Laser Scanner Assembly Main Motor Drum Motor Scanner Motor I O Controller Fan Fuser Fan Main Fan Unknown error Run Extended POST to isolate further 5 98 05 08 09 00 2 Flashing Color LaserWriter 12 600 PS Troubleshooting EPOST Codes Matrix 1 of 2 P With Test Plug Extended POST EPOST reports the errors shown in POST Codes Matrix plus all the errors shown below and on the next page Note that EPOST consumable and jam errors do not necessarily correspond to status panel readouts during normal operation UA FB amp Toner Lights Access Lights Maintenance Lights Error Designation _ L_ Ge Gey L L a a A U Ge a A L_ Ge Ge _ L_ Ge Gey _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Gey _ L_ Ge Gey _ L_ Ge Ge _ L_ Ge Gel _ L_ Ge Gel _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge FF F F Access Lights
29. CLW 12 660 chapter On site if the printer has just been serviced and has exhibited this error ever since immediately check connector J2009 on the mechanical controller board Disconnect J2009 remove it from the cable guides along the top of the board and then reconnect it Test the printer If the printer has just been moved or tilted the problem might be that oil has contaminated the sensor Replace the photo interrupter P N 922 1353 and test the printer If the problem persists open the fuser access door and lower the fuser delivery roller The actuator for PS10 rises through the floor on the delivery side of the fuser roller If you have a dental mirror you can place it against the lower fuser roller and get an unobstructed view of the actuator and photo interrupter The movie to the left shows how to position the mirror Lower Fuser Roller Photo Interrupter Actuator Oil Overflow Sensor PS10 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Movie Note 6 Note 7 Note 8 Note 9 If you do not have a mirror you can remove the two screws and the black trim piece above the fuser roller opening to get a partial direct view of the actuator The movie to the left is taken from this view and shows an actuator in the up position being pressed with the tip of a jeweller s screwdriver If the flag is up then oil is filling the pan Replace the fuser assembly Make sure to e
30. Carousel Motor M3 Drum Motor M4 Cleaning Brush Motor M5 Scanner Motor The main motor is a DC brushless motor It is controlled by the CPU on the mechanical controller board and provides mechanical drive to the following parts e Fuser assembly Upper and lower fuser rollers Fuser delivery roller Oil applying roller Oil pump e Paper delivery assembly e Transfer drum peripherals Attraction roller press cam Transfer drum press cam Cleaning brush press cam Discharge roller press cam e Waste toner screw inside the photoconductor cartridge The main motor itself is not a part of the printer drive assembly but is available separately as P N 922 1370 The toner carousel motor is a two phase stepping motor controlled by the toner carousel motor driver Q2003 on the mechanical controller board This motor is part of the printer drive assembly and provides mechanical drive to the toner carousel The drum motor is a two phase stepping motor controlled by the drum motor driver Q2002 on the mechanical controller board The drum motor is part of the printer drive assembly It provides mechanical drive to the photosensitive drum and to the transfer drum Drum Motor M4 Toner Carousel Position of Motor M3 Main Motor M2 The cleaning brush motor is a DC motor It is controlled by the CPU on the mechanical controller board and provides the mechanical drive that rotates the transfer drum cleani
31. Color LaserWriter 12 600 PS Basics amp Theory Vil Power Supply Color LaserWriter 12 600 PS Basics amp Theory Outline The power switch uses a remote switch method When the power switch SW 1 is turned on the DC controller is informed of this by the power supply circuit The DC controller turns on the control IC in the power supply circuit and the AC power supply is sent to the power supply circuit via the circuit breaker the noise filter etc Power Supply Board To Fuser leater Fuser Heater Fuser Heater Safety Circuit Drive circuit Fuser Abnormality Detection Circuit T oz 3 cBi01 Noise H 26 Filter a aS AC Power Circuit pI xx Supply Breaker Ras F1 ghee a 2S Z f amp E Rectifier G Circuit Rush Current DAV Prevention Overvoltage H 3 le sa Switching Rectifier as Transistor Transformer Circuit Asa 7 Overcurrent DC DC Regulator IC Convertor Control IC j 7 1 3 a Power 5 V Overcurrent gt Switch 5 VB Overvoltage Detection 3 Circuit sw 5 s 1 1 _ Photo Photo i coupler coupler 26 a 3 wus in XX gt xP RE 5 Z oo i 5 g 56 DOPN i 8 ARII Q 2 i GE FA X 1 5 Sd vo T2V Generation Z4 VC Generation Mechanical Circuit DG Co
32. Heater H2 Thermistor a Fuser Roller Temperature Detection Fuser Assembly POFF lt switch is ON 5_ PCONT L to turn ON the printer 7 DOPN _ H when the front door pickup door or fuser access Mechanical door is open Controller Board L when the fuser assembly is properly installed J112 31 H when improperly FXSTS installed pulse signal when fuser heater is ON 30 _ H when the safety circuit 29 ace turns OFF the relay 28 ae L to turn OFF the relay N The fuser heater can be turned ON when pulses are output 26 FXUON 27 lt L to turn ON the upper Par fuser heater L to turn ON the lower fuser heater The voltage decreases 9112 24 TH as the fuser roller temperature increases J112 22 7 FXSNS_ L when the fixing unit is installed TIT 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Temperature Humidity Sensor Density Sensing Board Density Control Panel DC Controller Board J73 1 J2005 5 J2007 6 J112 6 4t5V z HUMSNS Humidity sensor signal 3 5 4 3 B10 810 TMPSNS Temperature sensor signal Mechanical Controller Board J103 14 4t24V 1 4 5V c Density sensor signal 2 DsNs y 3 H to enter the color toner IDSEL density sensing mode L to enter the black toner density sensing mode 5 6 7 8 9 10 11 12 13 4 DO to D7 LED power
33. Ic 8 18 14 sgpsns H when print paper separates Sensor from the transfer drum 4 H Gripper Drive 4 15 GRIPon H to turn ON SL4 operating the Solenoid SL4 Su 10 A gripper drive solenoid 24V 5 17 28 Separation Solenoid SLS QO 2 16 16 sepon H to turn ON SL4 operating the fee separation claw J2007 21 TNSNS L when there is no toner or cartridge Receiver Emitter 5V 4 t J2017 5 TONLED H to turn ON the LED fa s TIT Toner Sensor PS11 J2013 6 L to rotate the main motor at the 7 normal speed H to operate it at 4 MLOW a half speed Main Motor 3 MRDY L when main motor rotates normally MON 4 1 L to turn ON the main motor seni GONA 2 COMB Toner Carousel Motor A Toner Carousel Drive Signal AO J2015 1 COMA 2 COMB 4 i Drum Motor mE S Drum Motor Drive Signal ae AO J2014 8 q 24V Cleaning Brush Motor 7 TTDCON L to turn ON the cleaning brush motor J2012 3 FAND1 24VC OV in the energy saving mode FANLK1 L when the fan motor rotates normally hr J2019 3 FAND2 24VC OV in the power saving mode 2 1 Fuser Fan Motor Qo O 2 Main Fan Motor FANLK2 L when the fan motor rotates normally J2010 3 rT Normally 24V 16V in the FAND3 energy saving mode with the fan Controller Fan Motor 2 FANLK3 7 motor rotating at half speed 1 L when the fan m
34. M4 and the pickup motor M1 After 0 5 second the manual feed solenoid SL2 is turned on to transmit the rotational force of the pickup motor to the manual feed pickup roller As the pickup roller rotates the paper lifting plate press cam is released and the spring force pushes up the paper lifting plate Thus the paper is pressed against the pickup roller and picked up by its rotation After the paper is separated from any extra sheet by the separation pad it is fed into the printer by feed roller 2 The subsequent operations are as described for cassette feeding Paper Lifting Plate Lifting Plate Press Cam 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Paper Size The paper size in the cassette is detected by the cassette size sensing switches CSW 1 2 and 3 on the cassette size sensing board Loading the cassette will turn the switches on or off as applicable The CPU on the DC controller detects the presence of the cassette and its size by this switch combination Cassette Size Sensing Switch Cassette CSW CSW2 CSW3 A4 OFF ON ON B5 ON ON LTR ON LGL Cassette Absent 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory For the universal cassette the actuators that press the cassette size sensing switches are linked with the paper guide in the cassette When the paper guide is set to the paper size the positioning of projections changes
35. Symptom Driven Troubleshooting 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Miscellaneous Issues 1 The front door opens too easily When you open and close the front door with the power on the DC controller assumes that you have opened the door to clear a jam and drives the cleaning brush to remove scattered toner This causes a delay If you want to tighten the door so that you do not open it inad vertently perform the Front Door Latch Adjustment procedure in the Take Apart chapter 2 High voltage power plays an extra role The Color LaserWriter 12 600 PS is the first printer from Apple in which high voltage power plays a role in both paper handling and image quality Inadequate transfer of high voltage power to the attrac tion roller separation discharge assembly or the transfer drum itself can result in paper jams while the cutting of high voltage to imaging rollers can result in blank pages If you experience such a problem refer to the lower right corner of the wiring diagram in this chapter Note what cables are going to what locations and make sure that all connections and contacts are secure 3 There is aloud grinding sound coming from the toner carousel This indicates blockage of the carousel If the printer has not yet been operational the problem is likely to be in initial setup probably in the handling of the toner cartridges See Troubleshooting Checklist for information on lockin
36. aiena a a A ees 3 11 FUSERASSOMDIV 55 arenie aaa a ara end a o da 3 13 F ser Oil Extraction ienen a e AEA 3 16 Paper Pickup Block REMOVAlI ceescceeeeeeeteeeeeeeeneeeeesneesenaeeeeeneeeeeeneeernaeeess 3 21 Paper Pickup Block Disassembly c ceeeceeeesneeeeeneeereneeeerseeeeeneeereees 3 23 Cassette Pickup Assembly cceeeceeseeseceeeseeteneeseeeeeaeeteaeeeaeeteaeeteeeenaeeeea 3 34 Multipurpose Pickup Assembly eeeeeeesceeeeeneeeeeneeeeeeeeeeeeaeeeseeeeeenaeeeeeas 3 35 Cassette Pickup Assembly Board cecceesceseeeeeeeeeeneeseeeeeaeeseaeenaeeeneteas 3 37 VO Controller Board 2 0 eset Gs hit ee dee es Nin eet eo des 3 41 TE epee en ee ag ee er ee Ere ee eRe eee 3 43 OZONG Filthy ties t eet et ns es EEE 3 45 Front DOOM aiena a Had a davevad ecgbe akg ieadiudeva cate diay cieduarseadevtves sina aa 3 47 Front Door Latch Adjustment eee eeeeeeeeeneeeeseeeeeeneeeeeeneeesnaeeeeeeeeeeeneeeneaeeees 3 48 TOP COVEN oviin niei Shinai aii tin radians rad 3 49 AbOutiINNEF Panels isinin anne di caveneindaedessacuwes ctuat cvstadaseecis eudeatbats 3 54 InfieriPanel A ssctiisckveai ict n tastneiieavetsaeie thane 3 55 lNMer Panel 2 scckst 2 hh aret A AEA th Latha E boi Bias aid 8 3 56 Janster Drum eT aE EA A E he Biche fuels bane nce Meech E AE S Madea aes 3 57 Toner Carousel Guide Panel ccccccccccssssccccecssseeeeecessseeseeeeessnseeeeeseseees 3 58 LOPE COVER 2 ecnszte aa e ea te ick Gerda oak
37. assembly 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Note 14 Note 15 Note 16 Note 17 The DC controller has detected an I O controller fan error On site remove J2010 from the mechanical controller board and reconnect it Test the printer If the problem persists replace the I O controller fan The DC controller has detected a fuser fan error On site remove J2012 from the mechanical controller board and reconnect it Test the printer If the problem persists replace the fuser fan The DC controller has detected a main fan error On site remove J2019 from the mechanical controller board and reconnect it Test the printer If the problem persists replace the main fan When all four lights flash there is an error that could not be detected within the short span of POST There are three errors of this type the laser scanner error and certain kinds of fuser and carousel errors Note The type of fuser error that flashes four lights during POST will appear as a detected fuser error yellow zero if you switch off and immediately restart the printer Over the phone ask the customer to restart the printer If the four lights resume flashing the problem is probably in the laser scanner assembly or carousel in that order If the fuser error appears go to note 4 On site initiate EPOST and act on the resulting error code 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Outline
38. assembly perform the Fuser Oil Extraction procedure that follows this topic 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Extraction page 1 of 5 First Remove the fuser access cover fuser oil bottle and fuser assembly General Description Residual oil remains in the fuser assembly after removal of the assembly from the printer If you are replacing the fuser assembly you must extract this oil with a syringe and then seal the oil reservoir before returning the assembly to Apple Note One syringe and a sealing block come with the replacement fuser assembly The syringe is also available separately as P N 922 1549 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Extraction page 2 of 5 Under normal conditions you need only extract the oil from the reser voir itself Step 1 describes the process of extracting oil from the reser voir When the control panel lights indicate an oil pump error see Power On Self Test in Chapter 2 an oil overflow condition is deemed to exist In this case you must also extract oil from the well leading to the oil overflow pan Steps 2 and 3 describe this procedure Fuser Assembly Oil Reservoir Overflow Well 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Oil Extraction page 3 of 5 Now Extraction from the oil reservoir 1 Place the tip of the syringe into the oil at the bottom of the reservoir and
39. control signal DENB L to turn ON the LED 77 J114 1 to 8 Serial Communications gt 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Mechanical Controller Board Input Output Signals Mechanical Controller Board High Voltage Power Supply Serial Communications Cassette Pickup Board K J2002_ X Serial Communications Toner Carousel Sensors 5VSAVE Toner J2006 4 Carousel 6 pevynp H when a flag is detected Position i See Carousel Rotational Detection in Sensor this chapter Toner 5VSAVE J2006 1 an Cartridge L when the toner cartridge is pressed Position E 3_ DEVCAM against the photosensitive drum Sensor H H when the toner cartridge is separated from the photosensitive drum CL2 Toner Carousel J2017 4_ f 24V Drive Clutch mers DEVON L to turn ON CL2 rotating the toner carousel H to turn OFF CL2 rotating the cartridge sleeve CL1 Toner Carousel J2017 2_ f 24V Brake Clutch C 1 DEVBRK L to turn ON CL1 braking the toner carousel Fuser Assembly A PS10 j2009 12 5VSAVE S OILFUL H when oil overflows from oil pan A Paper Delivery anne 5VSAVE Sensor POUT H when paper is detected CL4 24V Fuser Assembly J2011 2_ 1 Drive Clutch 1 FIXON L to turn ON SL3 rotating the rollers in the fuser assembly Sts 24V Cleaning Belt 32009 8 ia 7 WEBSL L to turn ON SL12 This solenoid is used to drive the c
40. controller In full color mode the I O controller sends the M magenta C cyan Y yellow and K black video signals to the DC controller in that order In the monochrome mode the I O controller sends only the video signals for monochrome 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory 1 141 The DC controller generates 8 bit video data signals DV2 DV9 in accordance with the video signals VDO0 VDO7 sent by the I O controller and then sends them to the PWM IC in the laser scanner assembly The laser drive circuit turns the laser diode on and off in accordance with the laser drive signal internal signal in the laser scanner assembly output from the PWM IC to generate the modulated laser beam The laser beam emitted by the laser drive signal is scanned across the photosensitive drum to create a latent image on the drum The latent image on the photosensitive drum is transferred to plain paper The paper is then delivered onto the face down tray or the face up tray While printing a page the DC controller checks whether or not the PRNT signal has been sent by the I O controller If no PRNT signal has been sent the printer terminates the print sequence with the current page and initiates the last rotations At the end of the last rotations the printer enters the standby STBY state On the other hand if the PRNT signal has been sent the printer continues the print sequence 95 08 23 11 31
41. controller It returns to the normal mode when a command to cancel the power saving mode is received from the I O controller 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Protection Function Remote Switch When the power switch on the printer is turned off the power supply circuit sets the power off signal POFF sent to the DC controller to H When the printer is subsequently ready to be turned off the DC controller sets the power off control signal PCONT to L This stops the switching regulator for the power supply circuit and turns off the printer This indirect shutdown of the printer allows the transfer drum to be parked in the home position and allows for excess heat to be exhausted The power supply circuits for 24 VDC and 5 VDC have an overcur rent overvoltage detection function which is activated if some problem has occurred If this function is activated it automatically shuts off the output voltage to protect the power supply circuit If no DC voltage is output from the power supply circuit because the overcurrent protection function has been activated turn off the power switch SW1 discon nect the power cable rectify the problem with the loads and then turn on the power switch again Do not turn on the printer for about two minutes after turning it off If overcurrent flows in the AC line the circuit breaker on the circuit is turned on to shut off the output voltage 95 08 23
42. current flows normally the FXSTS signal alternates between H and L at a certain frequency Thus the CPU can detect that the fuser heater is broken by the FXSTS signal 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Notes 1 When starting the temperature control the printer individually turns on the upper and lower fuser heaters and monitors them for breakage with the FXSTS signal Upper Fuser Heater Drive signal FXUON Lower Fuser i il Heater Drive signal FXLON Pit gt gt lt Upper lower heaters OFF Only uppe Piet Upper lower heaters ON heater ON r Only lower heater ON 2 To reset the fuser assembly abnormality detection circuit turn off the printer for about 30 minutes or discharge jumper JP102 on the DC controller board 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory 1 122 Oil Circulation System In order to prevent the tracking of toner onto the fuser rollers the printer uses an oil circulation system to lubricate the rollers Note Laser printer engines typically have fuser lubrication but usually in the form of oil impregnated rollers Due to the high fusing temperature and the characteristics of the mono component toner used in this printer additional lubrication is required An oil applying roller remains in contact with the upper fuser roller When the fuser assembly drive clutch CL4 is engaged the m
43. dently of its outer housing This design accomplishes two things it keeps toner plumb so as to avoid scattering that would otherwise occur and it reveals the developing cylinder in synch with a cartridge s arrival at the stop position Spring Loaded Bushing Pin 7 Pin 8 Slot for Slot for Pin 7 Pin 8 The developing bias transfer pin on the carousel end panel presses against the contact inside the rear face of the cartridge Pin 9 Contact for Pin 9 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Carousel Rotation The carousel rotates to advance the next toner cartridge to the photo sensitive drum Internal workings of the toner cartridge rotate independently of the housing Internal workings remain level throughout carousel rotation Photosensitive Drum Toner carousel motor M3 delivers rotational drive at this point Carousel End Panel When the print sequence command is received from the DC controller the mechanical controller sets the developing rotary brake signal DEVBRK to H and the toner carousel brake clutch CL1 to off to release the brake At the same time the developing rotary drive signal DEVON is set to L and the toner carousel drive clutch CL2 is turned on Then the toner carousel motor starts driving the rotation of the toner carousel The rotational position of the toner carousel is detected by the toner carousel position sensor PS4 by m
44. is normally separated from the transfer drum and it is pressed against it as necessary After the gripper solenoid SL4 is turned on and the paper top is clamped by the gripper the attraction roller press solenoid SL6 is turned on The rotation of the main motor actuates the attraction roller press cam to press the attraction roller against the transfer drum The attraction of the paper is detected by the attraction sensor PS6 Transfer Drum Attraction a Attraction Roller Press Cam Attraction Roller Pressed Attraction Roller Separated Transfer Drum Attraction Roller Attraction Roller Press Cam 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory The attraction roller is not driven by any motor but rotates along with the transfer drum When the paper reaches the attraction roller the attraction voltage corresponding to one cycle of the transfer drum is applied to the attraction roller Thus the paper is electrostatically attracted by the transfer drum In the full color mode the attraction roller rotates for the first color only When the paper for the first color passes through the attraction roller SL6 is turned off to separate the attraction roller from the transfer drum 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Separation Upon completion of the transfer the gripper solenoid SL4 is turned on and the gripper opens to raise the leading edge
45. of the paper The separation claw solenoid SL5 is also turned on to actuate the separa tion claw which then scoops up the leading edge of the paper to sepa rate the paper from the transfer drum The separation of the paper is detected by the separation sensor PS7 Separation Claw Solenoid Separation Claw Gripper AE Gripper Solenoid SL4 Paper 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Transfer Drum Cleaning Assembly The transfer drum cleaning assembly is operated following every 100 prints upon power on door open close or cleaning of the density detection pattern after image quality stability control The transfer drum cleaner is normally separated from the transfer drum After the transfer is completed and the paper is separated the transfer drum cleaner press solenoid SL8 is turned on to actuate the transfer drum cleaner press cam to press the cleaning brush against the transfer drum When the cleaning brush motor M5 is turned on the cleaning brush starts rotating After this cleaning is completed SL8 is turned off to release the cam and the spring force separates the cleaning brush from the transfer drum Simultaneously the cleaning brush motor is turned off Cleaning brush rotation will not interrupt a multiple page print job N O A ISs Y pe Cleaning gt N j D 2 uN d a 2 gt gt JA 4 PA Transfer Drum Cleaning Brush Press Cam Cleani
46. onto the paper When the paper reaches the transfer drum its leading edge is retained by the gripper so that the paper is retained on the transfer drum surface Since the leading edge of the paper is retained by the gripper approximately 8 mm of the leading edge cannot be imaged Transfer Drum Transfer Sheet n AD P a NN j pa y Aara k a gt O Yo pts Ca Soy gt x 5S NY Example The leading edge of the paper is gripped in frame 55 of the animation Gripper 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 6 Attraction Animation The attraction roller imparts negative charges onto the paper and helps hold the paper to the transfer drum surface by means of electrostatic force The attraction roller presses only for the first color and separates from the transfer drum upon completion of the transfer operation for the first color Note If you select Best as the print quality mode the entire sheet receives the attraction charge prior to any imaging This assures the best possible attraction of paper to drum and requires one extra rotation of the transfer drum For monochrome and continuous print operation the attraction roller is separated from the transfer drum upon completion of a single page transfer and returns to the drum before the transfer starts for the next page Transfer Sheet Transfer Drum os DC Bias Attraction R
47. paper from the drum 98 05 08 09 00
48. subsequent colors 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 8 Separation Animation Paper is separated from the transfer drum by the gripper and separation claw After passing through the separation discharge assembly the leading edge of the paper is pushed up by the gripper and the paper is separated from the transfer drum surface by the separation claw Separation Paper Gripper Discharge Assembly dese a AC Bias a DC Bias Transfer Drum 3 Separation Claw Transfer Drum In a low temperature and low humidity environment the separation discharge assembly is activated to assist in separating the paper from the transfer drum Note The separation discharge assembly can be forced on or off manually by means of the density control panel See Separation Voltage Designation earlier in this chapter Example The separation claw actuates in frame 232 of the animation The paper then separates from the drum and feeds toward the fuser assembly The leading edge of the paper trips separation sensor PS7 in frame 237 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 9 Transfer Drum Cleaning Cw Animation Stage 5 Transfer Drum Cleaning and Discharge After the page has left the transfer drum the printer must return the drum to a clean and electrically neutral state During density calibra
49. the PRNT signal sensitivity of the motor reaches the has been input fromthe photosensitive drum target speed the DC I O controller until the in preparation for controller sends the transfer drum rotates printing print sequence up to the top position command to the for the first color mechanical controller PRINT Print To form an image on From the end of the the photosensitive INTR period and the drum according to subsequent completion the VDO signal input of transfer until the from the I O transfer drum rotates controller and to up to the registration transfer the image to position the paper LSTR Last Rotations To deliver the last Cleaning of the From the end of the PRINT period until the main motor stops print and to discharge the transfer drum transfer drum occurs after every 100 prints 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory lll Laser Scanner System Color LaserWriter 12 600 PS Basics amp Theory Outline Animation Laser System When the PRNT signal is sent from the I O controller the DC controller performs Automatic Photoemission Control APC to stabi lize the intensity of the laser beam Upon completion of APC the DC controller generates 8 bit video data signals DV2 DV9 in accordance with the video signals VDO0 VDO7 sent by the I O controller and then sends them to the PWM IC in the laser scanner assembly According to the laser drive signal
50. the attraction sensor PS6 detects paper a specified period of time 1 48 seconds after transfer drum registration position detection 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory VI System Interface Color LaserWriter 12 600 PS Basics amp Theory Outline The I O controller in the printer converts the print data sent by external devices including the host computer into dot data which is then output from the I O controller to the DC controller The types of interface signals transmitted between the I O controller and the DC controller as well as an outline of the operation of the printer using the interface signals are described below External Device Host Computer etc Printer I O Controller Board eae Status Panel I O Interconnect Board DC Controller Board Scanner Motor Video Data Drive Signal Signals SCNON Dv2 Dv9 Scanner Laser Motor Unit Driver Note For more information on the I O system interface see the following documents that are bundled with Service Source e Inside the Color LaserWriter This is a short 15 page document that graphically illustrates the high lights of the controller technology in this printer Included is a descrip tion of Color PhotoGrade Contone compression technology and general principles of digital color imaging e Developer Tech Notes This is a product of Apple Developer Technical Publications and contai
51. toner disposal box is available separately as P N 922 1546 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Photoconductor Cartridge page 2 of 2 Now Place the end of the photoconductor tray on the V shaped entrance to the photoconductor compartment Release the green tab on the right edge of the cartridge Slide the cartridge into the tray making sure that the tabs on the cartridge track snugly along the top edges of the tray Photoconductor Cartridge Photoconductor Tray Green Tab 95 08 23 09 16 i i Q lt co x H Color LaserWriter 12 600 PS Fuser Access Cover page 1 of 2 No first steps are required First Now 1 Open the front door and the door to the paper pickup area Open the fuser access cover and remove the tab that connects the fuser door strap to the chassis ates ak AY Ye 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Fuser Access Cover page 2 of 2 2 Slide the fuser access cover leftward out of its hinge connector and remove the cover from the printer 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart First Now Fuser Oil Bottle page 1 of 2 No first steps are required Open the front door and lower the clamp that covers the fuser oil compartment Lift the fuser oil bottle from the printer Fuser Oil Bottle Oil Bottle Clamp
52. 1 Color LaserWriter 12 600 PS Basics amp Theory Separation The CPU determines that a separation stationary jam has occurred if the Stationary Jam paper is detected by the separation sensor PS7 a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second PRINT Registration Position Transfer Drum Top Sensor PS8 Jam Check Separation Sensor PS7 Main Motor M2 T4 3 4 5 3 in case of overhead transparencies Unit Second PRINT S Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Delivery Delay The CPU determines that a delivery delay jam has occurred if the paper Jam does not reach the delivery paper sensor PS9 a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second Registration Position Transfer Drum Top Sensor PS8 Jam Check Paper Delivery Sensor a9 5 Main Motor M2 T5 5 23 8 99 in case of overhead transparencies Unit Second PRINT S Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Delivery The CPU determines that a delivery stationary jam has occurred if the Stationary Jam paper
53. 1 148 Pickup Fe d SyStem viirit nieee uratna desde deren Acie 1 149 Power Supply nicit nie ie hae aa Ae a eel 1 150 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory General Information Color LaserWriter 12 600 PS Print Quality Speed Multiplatform Support Connectivity Automatic Traffic Control Fonts Energy Savings Hard Disk Option Paper Handling Basics amp Theory Features Some of the main features of the Color LaserWriter 12 600 PS are as follows The printer has a resolution of 600x600 dots per inch with color Photo Grade The printer prints up to 12 pages per minute in black cyan magenta or yellow 3 pages per minute in two or more colors and 1 transparency per minute You can connect the printer to Macintosh Windows DOS and UNIX computers The printer offers LocalTalk Ethernet and parallel connections Without any user intervention the printer can accept jobs simulta neously from AppleTalk TCP IP and NetWare networks and from the parallel port The printer supports both TrueType and PostScript fonts The printer has 39 built in PostScript fonts The printer can automatically lower its power consumption when it s not being used You can install an internal hard disk or attach up to six external hard disks to store downloadable fonts You can print up to 350 sheets 250 in the standard paper cassette plus 100 in the multipurpose tray with
54. 11 31 Color LaserWriter 12 600 PS Basics amp Theory Vill Sheet Feeder Color LaserWriter 12 600 PS Basics amp Theory Outline of Electrical Circuit The sheet feeder is electrically controlled by the sheet feeder controller board in the sheet feeder This board provides serial communications with the mechanical controller in the printer and outputs signals to drive the loads of the motors and the solenoids The power supply for the sheet feeder consists of 24 VDC generated by the internal power source and 5 VDC supplied by the printer The following block diagram shows the correlation between the sheet feeder and the printer Sheet Feeder Motor Cassette Feed Solenoid Sheet Feeder PS352 Pickup Sensor Renee Sheet Mechanical Cassette Feeder Controller Paper Controller Board Sensor Board in Printer Cassette Size Sensing Board Power Supply 5 V 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Sheet Feeder Controller Board Input Output Sheet Feeder Controller Board 5V PS352 J352 z Pickup Sensor 3 OPFEDSNS H when paper is available 5V PS351 J352 Cassette Paper 5 Present Sensor ps OPSNS H when no paper is available SL351 24V Cassette Feed J354 N Solenoid O 1 OPFED L the SL351 is turned on to rotate the pickup roller Sheet Feeder Motor IAO Sheet Feeder Motor Drive Signal Cassette Size Sensing Switc
55. 8 M6 Sheet feeder motor Part of the front sheet feeder pickup assembly P N 922 1358 Fan FM1 Fuser fan P N 922 1348 FM2 Main fan P N 922 1349 FM3 I O controller fan P N 922 1350 Fuser Heater H1 Upper fuser roller heater Part of the fuser assembly P Ns 661 0900 661 0901 H2 Lower fuser roller heater Part of the fuser assembly P Ns 661 0900 661 0901 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Circuit Boards Locations The illustrations below show circuit board locations for the Color LaserWriter 12 600 PS and the optional sheet feeder 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Descriptions The table below describes the major circuit boards used in the Color LaserWriter 12 600 PS and the optional sheet feeder No Name Function Availability 10 I O controller board I O interconnect board Relays signals between the DC controller and the I O controller boards DC controller board Controls printer functions laser scanner control image stabilization control fuser temperature control I O control and various other functions Mechanical controller board Controls the various loads and various detection functions motors developing unit fuser assembly transfer drum peripherals pickup high voltage sheet feeder etc High voltage power supply Applies voltage in sequential correspondence with primary charging developin
56. 9 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 4 of 11 2 Open the manual feed tray and remove the three black screws that secure the pickup block cover to the pickup block 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 5 of 11 3 The pickup block cover is held in place by two posts at the bottom of the pickup block and four positioning pins along the top edge of the block Shift the pickup block cover upward to clear the positioning pins thread the door lever though the opening and remove the cover from the pickup block Positioning Pins Door Lever Pickup Block Cover Note The pickup block cover is available as P N 922 1305 One of the actuators for door switch SW2 is a part of this cover 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 6 of 11 4 Separate the width guide from the multipurpose tray by flexing the guides and releasing the two pins Deflect the multipurpose tray to release its hinge pin and remove the tray from the pickup block Lower the width guide to its maximum and slide it off the pickup block Width Guide Multipurpose Tray 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 7 of 11 5 Remove the two brass colored screws that secure the trim cover to the pickup block There are three slider tabs on the
57. Availability Diagnostic Utility The Color LaserWriter Service Utility is a stand alone application for the Macintosh that lets you upload and download printer parameters from the DC controller board You connect your Macintosh to the printer s I O Test IOT connector by means of the utility interface cable P N 922 1703 The IOT connector is J109 on the DC controller board It is accessible through the left side of the printer see illustration under Verifying Printer Operation in this chapter If the left cover is in place you must remove the small IOT access plate built into the cover The utility can be found on the Service Source Companion CD path Diagnostic Utilities Color LW Service Utility folder Refer to the ReadMe file within that folder for full information on how to operate this utility 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting lll Flowchart Troubleshooting 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Flowchart A Switch on the printer y Do any fans motors LEDs come on indicating that power is getting into the printer NO Go to Flowchart B See POST in this chapter Are the paper out and paper jam lights flashing San San ooga Does the ready light illuminate steadily after 3 4 minutes e oog Go to Flowchart C Are any of the secondary lig
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59. Circuit Discharge Roller Voltage Generation Circuit Primary Charging Roller Voltage Circuit High Voltage Power Supply Board Transfer Roller Voltage Developing Bias ping Generation Circuit Generation Circuit DC Voltage Generation Circuit Separation Voltage Generation Circuit High Voltage Control IC 1003 Q Mechanical Controller Board Q DC Controller Board 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Voltage to Primary Charging Roller High Voltage Control Operation When the PRNT signal sent from the I O controller goes L and the print sequence command is entered from the DC controller to the mechanical controller the mechanical controller rotates the drum motor and controls the high voltage control IC IC1003 on the high voltage power supply board as follows The high voltage control IC IC 1003 on the high voltage power supply board outputs the primary charging DC voltage drive signal HV1DC1 primary charging AC voltage drive signal HV1AC1 primary charging DC voltage select signal HV1DCO primary charging AC voltage select signal HV1ACO and density adjustment signal for primary charging voltage HV1PWM to control the high voltage power supply The HV1DC1 signal and HV1AC1 signal turn the primary charging voltage DC AC on or off The HV1DCO signal selects the printing bias or the between
60. Color LaserWriter 12 600 PS and 12 660 PS Service Technical Documentation This document was created with FrameMaker 4 0 4 MU Alsel te lt gt Dilla E About Graphics Using the magnifier tool enables you to zoom Thumbnails into graphics and see greater detail Bookmarks pages out of Acrobat Page numbers that appear on the i About Printing Always use these numbers when printing paper do not reflect their true order within the document CCEE Could not open the specified file If you get this message when trying to launch a QuickTime movie you may not have enough memory to run MoviePlayer Try quitting out of other applications This error also may occur if you copied files from the CD to a hard drive and have not foldered the files identically to the arrangement of folders on the CD Service Source Color LaserWriter Color LaserWriter 12 600 PS Color LaserWriter 12 660 PS Color LaserWriter 12 660 PS 96 11 13 15 58 Color LaserWriter 12 660 PS Packaging and Setup Changes Overview The Color LaserWriter 12 660 PS is an enhanced version of the original Color LaserWriter 12 600 PS The 12 660 engine and plastics are identical to the original in every respect and all finished goods and service part numbers apply equally to both printers The sole differences between the two versions are in the packaging and setup the ROM
61. DV2 DV9 and mode setting signals M1 M8 in IC109 and then sent to the PWM board in the laser scanner assembly The DV2 DV9 signals are video data signals containing halftone information The M1 M8 signals control the image mode selection etc The PWM circuit modulates the DV2 DV9 signals into PWM signals and sends them as laser drive signals to the laser driver board The printer includes an anti counterfeiting function whereby a pattern unique to the printer is invisibly marked on every printout 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Laser Emission Laser Control Circuit The DC controller generates 8 bit video data signals DV2 DV9 and mode setting signals M1 M8 in the gate array IC109 in accordance with the video signals VDO0 VDO7 and image mode select signal IMCHR sent by the I O controller It sends those signals to the PWM IC in the laser driver board Based on the above signals the PWM IC produces laser drive signals with the pulse width corresponding to the halftone and then sends them to the laser driver circuit At this time when the forcible laser on signal LSON sent to the laser driver circuit is H and the video enable signal VDOENB is L the laser driver board turns the laser diode on in accordance with the laser drive signal DC Controller Board BDI BD Board TOP LSYNC Laser Driver Board VDO7 to 0 IMCHR Lase
62. IN Voltage is input in proportion to the 11 13 15 17 laser power 19 21 23 25 Dv2 to Dv9 Video data signals TIT 5V J102 4 A Beam Detect 3 oai Board BDI L when the BD signal is input 2 hr 24V J102 10 11 A 6 SCNCLK Reference clock signal oa 8 SCNON L to drive the scanner motor 9 SCNRDY L when the scanner motor 5 7 is rotating normally TIT J631 3 J106 6 OILSNS H when oil runs out Oil Low Sensor 1 5 PS13 2 4 m J61 3 J106 1 LEDON L when the power saving mode is set Cleaning Belt E 3 Sensor WEBSNS_ H when the cleaning belt has run out 2 2 PS5 a Tarer J41F 1 J105 13 4 5V H switched to L when the TOP 3 11 position of the transfer drum is detected e leo yur 2 q2 TOPREG i switched to H when the TH registration position is detected Waste Toner ae sor LEDON L when the power saving mode is set To 2D E big H when the waste toner is full Cassette Ejection Size Sensing Switch Sensing Switch al CSIZE3 The cassette size and the pulling 2 6 4j 3 5 IGORS operation for the ejector are detected CSIZE1 SW1601 nae Tr 95 08 23 11 29 Color LaserWriter 12 600 PS Power Supply Basics amp Theory DC Controller Board L when the power Safety Circuit Thermoswitch TP1 OO Upper Fuser Heater Thermoswitch H1 TP2 Lower Fuser
63. It won t harm anything it just won t work Note In order to perform EPOST the I O board configuration switch must be in the custom configuration position to the right If the switch is to the left EPOST will not work Switch off the printer and install the test plug into the LocalTalk port on the back of the I O controller board Switch the printer on The printer will now behave normally except that the startup sequence will last longer In addition if no error is detected by Extended POST an EPOST test page will print before control is passed on to the PostScript interpreter EPOST Test Page Note Remember to remove the loopback plug after running EPOST 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting T POST Codes Matrix te Flashing POST error arrays can occur during normal printer operation Therefore customers can observe an array and describe it to you even though they will not know its significance Important An error designation does not necessarily mean that the named module is defective it means that something along the functional path is defective Please refer to POST Codes Notes later in this topic for more information Qh Which How Many Q A D O Toner Lights Maintenance Lights Error Designation L U a a L U a A A L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge _ L_ Ge Ge
64. Now Remove the brass colored screw and remove inner panel 1 from the printer Screw Inner Panel 1 Replacement Note Make sure not to pinch the cables 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Inner Panel 2 No first steps are required Note Inner panel 2 is the plastic molding in the lower right portion of the front chassis wall Remove the brass colored screw the second screw up from the bottom right corner Insert a flat blade screwdriver near the bottom of the transfer drum lever and pull inner panel 2 from the printer Inner Panel 2 Screw Transfer Drum Lever 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Transfer Drum Panel First Remove the toner disposal box top cover inner panel 1 and inner panel 2 Note The transfer drum panel is the plastic molding on the front chassis wall that covers the end of the transfer drum Now Raise the disposal box cover and remove the four brass colored screws Lower the transfer drum lever and remove the transfer drum panel from the printer Disposal Box Cover Transfer Drum Panel 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Toner Carousel Guide Panel Remove the top cover and inner panel 1 Remove the five brass colored screws and the strap and remove the panel from the printer Strap Toner Carousel Guide Panel Replacement Note Make sure that the panel nests over the
65. PS Take Apart Oil Overflow Sensor PS10 page 1 of 6 First Remove the fuser access cover fuser oil bottle and the fuser assembly Set the fuser assembly down with the delivery side facing you Note The photo interrupter at oil overflow sensor is available as P N 922 1353 Now 1 Remove the tension spring that goes between the delivery roller mecha nism and the bottom plate of the fuser Pp SURFACE woo CONTACT MATONG HESS DESH ansa PRECAUOONY ATTENDONE ALIA TEMPERATURA TEMPERATURE ELQVEE Tension Spring 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Overflow Sensor PS10 page 2 of 6 2 Remove the two brass colored screws one that secures the right knob to the fuser and the other that secures the black cover plate to the fuser Release the two tabs at the right end of the fuser and remove the black cover plate Tab Cover Plate 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Overflow Sensor PS10 page 3 of 6 3 Remove the silver colored screw that secures the metal pivot mount to the fuser and slide the mount about 3 4 inch 2 cm to the right Remove the delivery roller mechanism from the fuser Pivot Mount Delivery Roller Mechanism 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Overflow Sensor PS10 page 4 of 6 4 Remove the two black screws and lift the long black trim piece from the fuser Remove the four brass colored scre
66. Pickup Block page 1 of 2 First Remove the cassette front cover and side access cover The sheet feeder pickup block consists of two assemblies the front paper pickup assembly P N 922 1358 and the rear paper pickup assembly P N 922 1359 Now 1 Remove the five silver colored screws and lift the metal gear cover from the sheet feeder Gear Cover Sheet Feeder Pickup Block N aro NM 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Pickup Block page 2 of 2 2 Remove the seven large silver colored screws disconnect the three connectors and lift the pickup block from the sheet feeder Connectors 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Front Paper Pickup Assembly First Remove the cassette front cover side access cover and pickup block Now Remove the E ring at the right hinge pin of the pickup block and sepa rate the front assembly from the rear assembly Front Paper Pickup Assembly Rear Paper Pickup Assembly E Ring 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Rear Paper Pickup Assembly First Remove the cassette front cover side access cover and pickup block Now Remove the E ring at the right hinge pin of the pickup block and sepa rate the front assembly from the rear assembly Front Paper Pickup Assembly Rear Paper Pickup Assembly E Ring 95 08 23 09 18 Color LaserWriter 12 600
67. Power off time measurement e Various detection functions e J O interface control This board controls various loads in response to signals from the DC controller board The mechanical controller returns the status signals to the DC controller The mechanical controller controls the cassette pickup board the high voltage power supply and the sheet feeder controller board via its serial communications The mechanical controller also provides e Drive of various motors and fan motors e Control of the toner carousel e Control of the fuser assembly e Control of the transfer drum and its peripheral assemblies e Control of the cassette pickup board the high voltage power supply and the sheet feeder controller board e Toner stirring function toner low detection and toner cartridge detection e Photosensitive drum life detection e Waste toner collection system control e Energy saving mode control 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory DC Controller Input Output Signals Laser Scanner Assembly DC Controller Board J111 23 22 NDOENB L when video data can be written LSON L to switch ON the laser diode forcibly a NHD Reset signal 7345 SCK1 Clock signal o M1 to M8 PWM mode setting signal TIT gt Analog signals are output to control J110 7 ienr lt the laser power Laser Diode 5 PD
68. Primary Charging Roller Cleaning Blade re Toner Transport Plate eca Waste Toner Transport Screw Photosensitive Sweeper Stri Drum i j Waste Toner Transport Screw Photosensitive Drum Toner Disposal Box 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory When the photosensitive drum door opens the shutter lever is released and the waste toner shutter of the photoconductor closes so that the waste toner is no longer exhausted Toner Disposal Shutter Box Lever Opening the disposal 9S f box cover releases the shutter lever and closes the waste toner outlet Y Waste Closing the disposal box cover presses the C Toner 4 Outlet shutter lever and opens Waste the waste toner outlet Toner n Outlet Shutter Waste Lever Toner Shutter Outlet Lever The waste toner level is detected by the waste toner sensor PS12 housed in the disposal box cover assembly When the waste disposal box gets full the DC controller notifies the I O controller of the waste toner full condition and stops the printer PS12 Receiver PS12 Emitter Waste Disposal Box Toner Normal Waste Toner Full 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 5 Grip a Ce Animation Stage 4 Transfer This stage consists of four steps grip attraction transfer and separa tion This stage is where the toner image is mapped from the photosen sitive drum
69. S Take Apart Separation Discharge Assembly First No first steps are required Now 1 Open the front door and the top cover 2 Release the tab press the assembly slightly to the right and remove the assembly from the printer 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Status Panel Bottom Cover No first steps are required Open the front door Carefully release the two tabs and slide off the status panel bottom cover Caution These tabs are very delicate do not apply too much force Status Panel Bottom Cover 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Status Panel First Remove the status panel bottom cover Now Carefully release the four flex type tabs and disconnect the ribbon cable Remove the status panel from the printer Tabs Status Panel 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Main Motor First Remove top cover left cover rear cover and rear shield plate Now Disconnect J2013 from the mechanical controller board Remove the four silver colored screws and remove the motor from the printer Main Motor J2013 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart About Fans General There are three exhaust fans in the Color LaserWriter 12 600 PS Take apart procedures for each immediately follow this topic The role of each fan is as follows 1 Fuser fan FM1 Exhaus
70. SSNS goes H when it is larger than B5 the signal goes L Manual feed paper present sensor When there is no paper on the manual feed tray the manual feed paper sensor signal MPPSNS goes H Paper leading edge sensor This sensor is located on the feed side of the transfer drum When paper is detected the paper top sensor signal TOPREG goes H For a transparency the signal remains H only while the white band on its leading edge is being detected The inten sity of light may be changed using the LED power select signal LEDDRV described on the previous page Pickup motor This is a two phase stepping motor Cassette feed solenoid This solenoid controls the transmission of rota tional drive from the pickup motor to the cassette pickup roller When the cassette feed solenoid drive signal CPFED goes L the solenoid is turned on Manual feed solenoid This solenoid controls the transmission of rota tional drive from the pickup motor to the manual feed pickup roller When the manual feed solenoid drive signal MPFED goes L the solenoid is turned on Registration roller clutch This clutch controls the transmission of rota tional drive from the pickup motor to the registration roller When the registration roller clutch drive signal REGFED goes L the clutch is engaged 95 08 23 11 30 Basics amp Color LaserWriter 12 600 PS Cassette Pickup Board Theory
71. Soc Gh Oe ded cca a sk ee e aTa 3 59 REAR COVEN 2 c28iibe cea nt 2S on 12s et OF Serle es Dea ibe eke bb ie ot Rees BEY oe 3 60 Rear Shield Plate cic cites cts i ie dtd Se i td ee 3 61 Separation Discharge Assembly ceeceeeceeeeeeeereeseeeeeeeeeeeeeeeseaeesteeeeeeenaees 3 62 Status Panel Bottom Cover ccccccccccssscccccsssssceeeeesseeeecescesseseeeeeessseeeeeeeeseaes 3 63 Status Panel ti costes Vass E Gee ite eee ee 3 64 Mair MOTOL sorrend ecvede eden thsbasea cage eaat a aae apaa aeeoe lap eate 3 65 About F s saen cde iad enn i catecddane ito a a esate 3 66 Fuser Fani F Ml sve eerie ciel ei ais Aetna Be Ee 3 67 Main Fan EM2 cis E el te ich eh es Se lee tes Shan 3 69 VO Controller Fan EMS vss csiscccesacescadchiaaesessesesuaiceven tus siacaessesaseadensaainapany 3 72 W O Interconnect Shield sairis a aee aiaee aara Kharia eria S riai 3 74 BINAK Mat aE EREA T A TA 3 76 W O IntercONNect BOard r a a aaa 3 77 DC Controller Board ccccccscscscssccccececcceceeeecceesesseseseeeeeceesscauauecaeeeeeeeueuseeeeeess 3 78 Laser Scanner Assembly ecceeececeeeeeeeeceeeeneeseeeeeeeseaeeeaeeeeaeeeeeeeeaeeseaeeeaeetea 3 83 Mechanical Controller Board cccccscsssscccccceeceeeeeeeceeeceeeeeeeeseessesesssssseaeeeeees 3 84 Mechanical Controller Mount and Board cccccccccccceccssseeceecsssseeeeeeeessaeeees 3 85 Power SUppIVs cs cit he tele Anil bn a ee 3 88 High Voltage Power Supply cecceseceeseeeeeeeceee
72. TAR EXPONERSE AL RAYO VARO AVATTAESSA OLET ALTTIINA NAKYMATTOMALLE LASERSATEILYLLE ALA KATSO SATEESEEN VARNING OSYNLIG LASERSTRALNING NAR DENNA DEL AR PPNAD BETRAKTA EJ STRALEN ADVARSEL Prie ee NAR DENNE ER BEN ADVARSEL USYN UG LASERSTRALING NAR DEKSEL PNES UNNGA EKSPONERING FOR STRALEN E CONN OARTEATAL Y KHBNSNTLST V KesPHSAHsudseuT CRAY Laser Safety Label If you get toner on your skin or clothes remove as much as possible with dry tissue and then wash with cold water Do not let toner come into contact with vinyl material The charging roller and separation discharge assembly generate very small amounts of ozone gas when the printer is operating The printer meets the Underwriters Laboratory UL ozone emission standard 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory Outline Movie Status Panel The Color LaserWriter 12 600 PS status panel consists of 4 primary and 17 secondary lights The primary lights arranged horizontally along the bottom of the panel are similar to those on the LED panels on many of Apple s previous printers During normal operation primary lights report general readiness states for consumables paper supply and paper feed Secondary lights report on specific consumables and highlight locations of a consumable paper jam or paper problems The QuickTime movie to the left shows the normal operational behavior of the status panel when the
73. VDO0 VDO7 for each of four colors M Magenta C Cyan Y Yellow and K Black and the Image Mode Select signal IMCHR which is used to set either the text mode binary mode or the image mode halftone mode DC Controller Board Laser Driver Board Image Masking VDO 0 7 IMCHR Halftone Correction Laser Driver Circuit Note In order to ensure that text and halftone images are each properly printed out the printer switches its image mode via the IMCHR signal sent by the I O controller In the image data of the printer there is both full color mode and mono chrome mode In the full color mode the I O controller sends the video signals in the order of M C Y and K to the DC controller In the monochrome mode it sends the video signals for only a single color The video signals VDO0 VDO7 and the IMCHR signal sent to the DC controller by the I O controller are sent to the gate array IC109 via IC111 ine memory IC109 processes VDOO VDO7 to perform the image masking halftone correction etc Note The printer incorporates the halftone correction table in the DC controller so that the ideal halftone image can be obtained This allows the video signals VDO0 VDO7 sent by the I O controller to be corrected and converted to the video data signals DV2 DV9 They are subsequently output to the laser driver The signals are then converted to 8 bit video data signals
74. a Yellow Cyan Black Yellow Home and Stop Fetch Stop Fetch Stop Fetch Stop and Magenta Magenta Fetch Fetch L1 Approx 11 9mm L2 Approx 62 9mm L3 Approx 2 2mm L4 Approx 64 0mm L5 Approx 6 1 mm Width of Flags and Distance Between Flags 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory 1 77 Toner Cartridge Position Detection The press separation of the toner cartridge is detected by the toner cartridge position sensor PS3 by monitoring the position detection flag When the cartridge is separated from the drum the flag interrupts PS3 and the toner cartridge position sensor signal DEVCAM is set to L When the cartridge is pressed against the drum the flag leaves PS3 and DEVCAM is set to H The relationship between the cartridge press cam press detection flag and the press sensor is shown below Toner Cartridge Photosensitive Drum Toner Cartridge Position Sensor PS3 Sensor Flag Stop Position Sensor Flag Press Position 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Carousel Rotation Failure Cartridge Press Separation Failure When the following phenomena are detected by the toner carousel posi tion sensor PS4 the DC controller is notified by the mechanical controller and judges them as carousel rotation failures The DC controller notifies the I O controller of the faults and stops the printer e PS4 does not detect the rotational positi
75. access cover P N 922 1339 strikes a lever that is in contact with the door switch assembly An actuator on the pickup block cover P N 922 1305 strikes the door switch assembly directly All three of these must be closed for the switch to be pressed SW1601 Ejection sensing switch Part of the cassette sizing sensor assembly P N 922 1623 SW2001 Mechanical controller reset switch This switch was used during printer development and was removed early in production It may not be present on your unit CSW Cassette size sensing switch 1 Part of the cassette sizing sensor assembly P N 922 1623 csw2 Cassette size sensing switch 2 Part of the cassette sizing sensor assembly P N 922 1623 CSW3 Cassette size sensing switch 3 Part of the cassette sizing sensor assembly P N 922 1623 SW301 Sheet feeder side registration adjustment switch Part of sheet feeder controller board P N 922 1355 SW302 Sheet feeder right door switch Part of sheet feeder controller board P N 922 1355 CSW301 Cassette size sensing switch 1 Sheet feeder CSW302 Cassette size sensing switch 2 Sheet feeder CSW303 Cassette size sensing switch 3 Sheet feeder 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Sensors Locations The illustrations below show sensor locations for the Color LaserWriter 12 600 PS and the optional sheet feeder ee 96 05 15 10 25 Color LaserWriter 12 600 PS Illus
76. accordingly l Actuator Paper Guide Note If the toner release handle is pulled out the ejection sensing switch SW1601 is turned on The DC controller will set all the cassette size signals CSIZE1 CSIZE2 and CSIZE3 to L regardless of the cassette size that is installed When the DC controller detects that the toner release handle has been pulled out it will perform image quality stability control after the front door is closed 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Overhead Transparency Detection When you use overhead transparency material for this printer you must use the type with a white band at its leading edge The printer makes the following determinations by measuring the period that the paper leading edge sensor PS303 is interrupted by this band e Whether it is the correct type of transparency another type of trans parency or paper e Whether it is placed with the proper side up e Whether it is placed with the proper edge leading Note The band and arrows on the left side of the transparency are not used in this printer All markings disappear during the fusing stage If any nondedicated transparency is used or the dedicated transparency sheet is placed incorrectly in the tray the mechanical controller will notify the DC controller which will stop the printer and notify the I O controller of a nondedicated transparency jam White Band 7 Whi
77. acket 96 09 12 16 35 Color LaserWriter 12 600 PS Take Apart First Now Air Filter page 1 of 2 No first steps are required Note This part is available as P N 922 1307 It also comes with the Fuser Replacement Kit Finished Goods P N M3867G A for 110 V and M4234G A for 220 V Press down slightly on the top of the filter cover pull it outward and remove it from the printer 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Air Filter page 2 of 2 2 Unlock and remove the air filter from the cover 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Ozone Filter page 1 of 2 First No first steps are required Now 1 Press down slightly on the top of the filter cover pull it outward and remove it from the printer gt a eo j AAS 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Ozone Filter page 2 of 2 2 Grasp the tab on the ozone filter and slide the filter from its slot behind the fuser fan t Ozone Filter 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Front Door First No first steps are required Now Open the front door and remove the brass colored screw that holds the support strap to the door Lift the front door upward off its hinge plates and remove it fro
78. ain motor drives the upper and lower fuser rollers the oil applying roller and the oil pump The oil sent from the oil bottle to the oil pan under the oil bottle case is collected using the pump and then dropped from the oil nozzle down to the oil applying roller Very small amounts of oil remain on the oil applying roller and the oil applying blade As the applying roller rotates the oil blade controls the amount of oil and then the oil is applied to the upper fuser roller Any excessive oil drops from both ends of the applying blade down to the oil tank and then drops down to the oil catch tray after passing through a pipe The oil catch tray has a filter that filters out dust and other foreign matter The filtered oil is sucked by the pump into the oil bottle for recirculation Oil Applying Roller Oil Nozzle Upper Fuser Roller J V Pipe Pump The amount of oil remaining in the fuser oil bottle is detected by the oil low sensor PS13 mounted to the chassis behind the fuser assembly As the oil level drops a floating ball in the fuser oil bottle interrupts PS13 and the oil sensor signal OILSNS goes H 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory If the CPU on the DC controller detects that oil is low it issues an oil low notice to the I O controller Approximately 50 sheets of paper can be printed before the CPU determines that oil has run out and stops the printer T
79. al Cassette Paper Sensor Signal CPSNS Transfer Drum Top Sensor Signal Cassette Feed Solenoid Drive aper Sensor Signal REGSNS Manual Feed Solenoid Drive Signal MPFED Manual Feed Paper Sensor Signal MPPSNS Paper Leading Edge Sensor Manual Feed Paper Size Sensor Signal MPSSNS P58 Manual Feed Tray A leds A 8 Registration Roller Feed Roller 4 esi Ps Manual Feeding Pickup Roller Casset tte i Pickup Roller Cassette Separation Roller Feed Roller 1 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Animation PS301 Photo reflector PS302 Photo interrupter PS303 Photo reflector The three sensors described below govern paper feed from the cassette PS302 and PS303 are also active in print cycles originating from the multipurpose tray or optional sheet feeder Each of these sensors is contained on the cassette pickup board P N 922 1311 Two are reflector type sensors and one is a conventional photo interrupter sensor The presence of paper in the cassette is detected by the cassette paper sensor PS301 Example The animation shows the paper path for the final sheet of paper in the cassette Up through frame 57 the light emitted from PS301 reflects off the paper and back to PS301 When the trailing edge of the last sheet of paper passes this beam in frame 58 the bea
80. and RAM on the I O controller board and the driver software The Color LaserWriter 12 660 PS requires two extra steps during setup the leveling of the printer and the removal of oil absorption sheets from the fuser assembly Note The orange flag that identifies the shipping screw has also been enlarged in the new version of the printer The leveling procedure helps to alleviate oil overflow problems within the fuser assembly The level and shim kit that comes with the 12 660 PS is also available separately as P N 076 0622 for those who would to perform the procedure on the original version of the printer After removing the packing tape from the outside of the printer performing the leveling procedure below before proceeding any further Remove the spirit level and the round black rubber shims from their package Snap the spirit level into its base Open the printer s top access cover and place the spirit level on top of the fuser to level the printer first from front to back then from side to side Spirit Level 96 11 13 15 58 Color LaserWriter 12 660 PS 3 3 3 Place the shims under the printer s feet as needed to level the printer The oil absorption sheets have been installed to eliminate migration of silicon oil during shipping After leveling the printer remove the shipping spacers and absorption sheets as described below 1 Open the fuser access door and remove the two orang
81. appropriate alert to the status panel Only new cartridges initialize page count Otherwise the printer would recognize as new any used cartridge that had been removed and rein stalled This safeguard is achieved by storing a second value in EEPROM the thickness of the photosensitive drum Note Before replacing the DC controller board you must download these values see Chapter 2 If you are installing a new photocon ductor and there is a chance that the old one will be reinstalled as a troubleshooting measure for example you must also download these values The thickness of the photosensitive drum is detected upon power on door open and each time a certain number of prints is reached Drum thickness is detected by measuring the discharged current value after charging by the primary charging roller to the photosensitive drum For correct measurement of the current value the photosensitive drum and the transfer drum are separated from each other and the thickness detec tion is performed See Drum Separation below The photosensitive drum thickness detection circuit is in the high voltage power supply board After the power is turned on and the main motor is turned on the drum press solenoid SL7 is turned on and the photosensitive drum and the transfer drum are separated Then the drum motor is turned on the primary charging DC voltage drive signal HV1DC1 and the primary charging AC voltage drive signal HV1AC1 are se
82. art A IV Symptom Driven Troubleshooting This section is geared toward a quick retrieval approach to trouble shooting and contains topics such as Print Quality Defects and Miscellaneous Problems This section is designed to expand to cover late breaking issues that are reported from the field 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting I Preparation and Tips 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Troubleshooting Checklist Before troubleshooting the printer make sure that you have checked the following items in the order in which they are listed 1 Make sure that the printer is on a flat sturdy surface and that it is isolated from vibrations direct sunlight or environmental condi tions that do not meet specification Caution It is extremely important that the printer be on a perfectly level surface Oil overflow errors can occur due to out of level surfaces See the Leveling Instructions addendum at the end of this chapter for complete information Install the photoconductor cartridge and toner disposal box and lower the disposal box cover Examine each cartridge and make sure that its inner workings are locked and cannot turn within the cartridge housing Note If you can turn the inner housing to see the toner coated developing cylinder the cartridge is not locked Hold the cartridge in your hands with the dark black inner housing facing up Turn the
83. artup page s okay but there is a problem printing from the host computer Is the size and type of paper the same as what the startup page printed on If you have a PowerBook connect it to the printer and issue a Print Window command from the Finder the last item in the File menu If this prints then the problem is external to the printer in either networking connections or host software To test the printer s ability to image a memory intensive page from a source application print page 1 of this manual Refer to the following chapters in the Color LaserWriter 12 600 PS User Guide an Adobe Acrobat version is provided on Service Source Chapter 2 Setting Up the Printer for Macintosh Users Chapter 3 Setting Up the Printer for Windows and NetWare Users Chapter 4 Setting Up the Printer for UNIX Users If you continue to experience problems call Apple Technical Assistance Center e e For optimum color quality on legal size paper you must upgrade RAM to 16 MB You cannot print onto envelopes You cannot print onto paper narrower than 7 16 182 mm Load letterhead face up in the cassette and face down on the multipurpose tray You can use only transparencies that are designed for this printer You must load them onto the multipurpose tray with the white bands at the leading edge and to the left 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting IV
84. assembly board PS8 Transfer drum top sensor located within the transfer drum assembly PS6 Attraction sensor located within the transfer drum assembly PS7 Separation sensor located within the transfer drum assembly PS9 Delivery paper sensor located with the fuser assembly The CPU in the mechanical controller monitors sensor timing and compares it against what has been calculated to be normal Abnormal sensor timing is reported to the DC controller which stops printer oper ation The DC controller then notifies the I O controller of the jam condition There are 11 jam conditions as described on the following pages 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Pickup Delay The CPU determines that a pickup delay jam has occurred if the paper Jam does not reach the registration paper sensor PS302 within a specified period of time after the feed solenoid is engaged Unit Second Unit Second Feed Solenoid SL1 SL2 SL351 Jam Check Paper Leading Edge Sensor PS303 Pickup Motor M1 T1 0 83 Cassette feed Manual feed 1 17 Paper feeder T2 2 57 Cassette feed Paper feeder 2 07 Manual feed 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Paper Top The CPU determines that a paper top position delay jam has occurred if Position Delay the paper does not reach the paper leading edge sensor PS303 within Jam a specified period of tim
85. assettes are available that support letter A4 B5 and U S legal paper sizes Cassettes are compatible with both the printer and the optional sheet feeder Apple has tested the following papers and found them to be acceptable e Aussydat lay A4 France 100 g m e Boise Cascade Laser 20 and 24 pound e Classic Crest 24 pound e Hammermill Laser Print 24 pound e Legacy Laser Paper 24 pound e Nekoosa Laser 1000 24 pound e Neusiedler A4 Austria 100 g m e Xerox 4024 LTR and A4 20 24 and 28 pound e Nekoosa Laser 1000 24 pound Note Recycled paper is not recommended It tends to produce more paper dust degrading image quality and necessitating more frequent replacement of the fuser assembly 95 08 23 11 28 Color LaserWriter 12 600 PS Dimensions Weight Environmental Conditions Acoustic Output Wait Times Voltage Requirements Power Consumption Basics amp Theory Height 18 in 46 cm Width 21 in 54 cm Depth 23 in 58 cm Approximately 110 1b 50 kg for the printer body only During printer operation Temperature 50 to 86 F 10 to 30 C and humidity 20 to 80 percent RH noncondensing for optimum print quality operate at 35 to 70 percent RH In storage both toner cartridges and printer Temperature 4 to 104 F 20 to 40 C and humidity 10 to 95 percent RH noncondensing Standby less than 45 dB Printing less than 55 dB e Either 120 or 240 V 3 5 minutes m
86. aximum e Either 100 or 220 V 4 5 minutes maximum 100 to 120 V 50 60 Hz or 220 to 240 V 50 Hz voltage tolerance plus or minus 10 Energy saving mode e Approximately 42 W meets EPA Energy Star Standby average e 100 120 V approximately 215 W e 220 240 V approximately 238 W Operating average e 100 120 V approximately 535 W e 220 240 V approximately 524 W Maximum power consumption e 100 120 V approximately 1 1 KW e 220 240 V approximately 1 0 KW 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory Laser Safety Toner Safety Ozone Safety Safety Information The invisible laser beam irradiated within the laser scanner assembly can be harmful if it comes into contact with your eyes Consequently never disassemble the laser scanner assembly A cautionary label has been affixed to the top of the laser scanner assembly Note The laser scanner assembly cannot be adjusted in the field nor are any of its components available from Apple DANGE R lInvisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM INVISIBLE LASER RADIATION WHEN OPEN i AVOID EXPOSURE TO BEAM RAYONNEMENT LASER INVISIBLE 2 i D OUVERTURE A h EXPOSITION DANGEREUSE AU FAISC UNSICHTBARE LASERSTRAHLUNG WENN Gece GE FFNET ie NICHT DEM STRAHL AUSSETZEN ATTENZIONE RADIAZIONE LASER INVISIBILE IN CASO DI APERTURA EVITARE L ESPOSIZIONE AL FASCIO PRECAUCION RADIACION LASER INVISIBLE CUANDO SE ABRE EVI
87. bly 110 V 661 0901 Fuser Assembly 220 V S NY 4 922 1407 661 0906 Oil Assy Transfer 922 1304 Sensor 922 1549 D 922 1299 Power inge hae Power Switch uc Syringe 922 1339 Fuser Access Cover Switch Cover 990 1368 922 1323 irene Transfer Button 77 Transfer Drum Cassette Pickup Drum Lever Drum Knob lt Cleaning Assy Motor Cover D Ia yu 661 0907 3 p Cassette Pickup Assy 922 1324 MP Pickup Assy Cover 922 1322 922 1297 gt i Carousel Knob Bushing Multipurpose Pickup Assy 922 1292 922 1296 7 A Carousel Knob 922 1342 Pickup Trim Cover 922 1300 Disposal Box Z Toner Carousel Guide Panel Cover Assy 922 1305 Pickup Block Cover 922 1546 ale lt 922 1313 ae Multipurpose bie Width Guide Shipping Screw 922 1295 7 MP Tray Notes Front Door Extension 1 Asterisk indicates parts available through finished goods 2 See next page for exploded view of optional sheet feeder 922 1312 MP Door Cover lt a gt
88. board from the pickup block Note Do not disconnect J305 from the pickup assembly board J305 connects to a small daughterboard on which the photo reflector for paper leading edge sensor PS303 is mounted This small board is a part of the cassette pickup assembly board P N 922 1311 J304 J303 J302 2 J305 Replacement Note Engage the three claws at the bottom of the board 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart I O Controller Board page 1 of 2 First No first steps are required Now 1 Loosen the two captive screws and slide the I O controller board from the printer Note If you are removing the I O controller board to get to a deeper part stop here If you are replacing the board proceed to step 2 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart O Controller Board page 2 of 2 A replacement I O controller board comes without SIMMs and without the I O bracket If you are replacing a board remove the SIMMs from the old board and install them onto the new board If the board you are replacing had v 1 0 ROMs copy the LaserWriter Color 12 660 PPD into the customer s Printer Description folder For more information see Driver Software in the CLW 12 660 chapter 2 To remove the I O bracket remove the seven screws that secure the board to the bracket plate and the four screws that secure the connectors to the bracket face panel Separate the I O board from the br
89. cable cover tab and slide the cover toward the carousel to release the claws Remove the cable cover from the chassis Disconnect the oil sensor cable from the transit coupling and remove the oil sensor assembly from the printer Cable Cover Transit Coupling 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Disposal Box Cover Assembly page 1 of 2 First Remove the toner disposal box Now 1 Release the three tabs and remove the facing panel of the disposal box cover assembly Disposal Box Cover Assembly Tab 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Disposal Box Cover Assembly page 2 of 2 2 Disconnect the three wire connector from J631 on the sensor board Remove the large stepped screw free the cable from the cable clamp and cable guide and remove the disposal box cover from the printer vea Stepped Screw Note The stepped screw is a part of screw kit P N 076 0501 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Release Assembly page 1 of 2 First Remove the toner cartridges front door inner panel 1 toner carousel guide panel top cover and left cover Now 1 Disconnect the five wire temperature humidity connector from the transit coupling on the inside face of the rear chassis Transit Coupling Toner Release Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Release Assembly page 2 of 2 2 Release the two tabs p
90. calibration density sensor circuit On site check to make sure that the black arm at the end of the density sensing assembly is correctly attached to the top access door and that there is nothing keeping the assembly from pivoting down and resting above the transfer drum Check the ribbon cable connection at J103 on the DC controller board and at its opposite end on the sensing assembly If the problem persists replace the density sensing assembly Replace the DC controller board P N 661 0898 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Note 10 Note 11 Note 12 Note 13 The DC controller has detected incorrect timing at carousel position sensor PS4 This is consistent with a jammed carousel Over the phone ask if the printer has been on line yet If it has not the problem is likely in initial setup most likely in the handling of the toner cartridges Make sure that the customer has removed the sealing tape from each cartridge and that the cartridges are correctly installed If the printer has been operational ask if the carousel knob is able to advance the carousel If necessary you might also play the carousel rotational sound to the customer If the knob operates properly and the customer can confirm carousel movement during startup the problem is likely with connections or intermittent blockage On site remove the top and left covers Switch on the printer and try to determine if there is an
91. ce application This same process allows live black text to be imaged in black toner only instead of 100 saturation of cyan magenta and yellow Live text will be extremely sharp graphic text will tend to be blurry We have two Color LaserWriter 12 600 PS printers and we get slightly different colors from them Is there any way to adjust them The printer is adjusted at the factory to produce the best possible image quality If you want to change from these defaults see Density Control Panel in Chapter 1 I am getting some banding on my prints The term banding is generically defined as nonuniform density along the length of the page and usually appears as some kind of horizontal print defect Banding can very difficult to measure but is easily discerned by the human eye Banding caused by electrophotographic and high voltage processes has been minimized in this printer but will appear in some cases This banding is a natural function of digital imaging and cannot be completely remedied 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting To minimize this effect try to avoid large flat areas of color as they will most readily reveal this type of banding and keep the printer away from machinery that might cause excessive vibration In addition take care in maintaining the printer and in keeping it clean and level Banding caused by mechanical processes can be remedied See the print quality issue be
92. charge signal TCDIS is set to H and C106 is forcibly discharged to the voltage level measured at the time of power on and the required time is measured Based on this measured time the time during which the power was turned off is calculated The sensitivity of the thermistor differs between its high and low temperature ranges In order to increase the detection accuracy in either range the CPU in the DC controller uses the thermistor sensi tivity select signal THSEL to switch the thermistor sensitivity between the mode in which the detection accuracy is higher at low temperatures and that in which it is higher at high temperatures When the THSEL signal goes H the thermistor is put in the low temperature detection mode and when L in the high temperature detection mode 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fuser Error B The fuser heater safety circuit in the power supply unit will shut off the Fuser Safety power supplied to the fuser heater if the fuser temperature rises abnor Circuit Detects mally Error DC Mechanical Controller Controller Board Board Power Supply IC101 24V i RL T2 FXUON FXLON Fuser Heater Drive Circuit SFSNS FXROF a FXENB Safety 2 Circuit IC 14 Z4 5V Fuser Heater i Z5 ho 5V Safety Circuit FXSTS Q805 Fuser Assembly THI Abnormality J De
93. colors bias between pages bias The HV1ACO signal switches the primary charging voltage AC current value according to the environment detected by the tempera ture humidity sensing system The output value of the HV1PWM signal remains fixed HV1DCO HV1DC1 HV1ACO HV1AC1 OFF H Between Colors Bias Between Pages Bias AC Current Low Print Bias AC Current High 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory For the initial rotations IC 1003 sets the HV1DC1 signal to L and the HV1DCO signal to L to apply between colors bias between pages bias to the primary charging roller Then the HV1DC1 signal goes L and the HV1AC1 signal goes H so that the primary charging roller is charged with the print bias with the primary charging voltage AC bias and DC bias being superimposed For between colors between pages the HV1AC1 signal is set to H and only the DC bias is applied with the AC bias turned off High Voltage Power Supply Primary Charging Roller Voltage Generation Circuit i Constant Voltage Circuit SW Ge Sate i Primary HV1PWM Integral PE DC Voltage Overlapping ee Gircuit Weed ie h Circuit gt D gt Generation HV1DCO Voltage Vo
94. cuit will recognize it as a mismatch in rated voltage due to incorrect installation of the fuser assembly In this case the CPU on the DC controller notifies the I O controller of a power supply failure and stops the printer The rated voltage of the power supply unit is set with the jumper JP1 and monitored at pin 4 on Z5 The specified voltage of the fuser assembly is set with the jumper JP2 within the fuser assembly and monitored at pin 7 on Z5 Pin 2 on Z5 goes L when the rated voltage of the power supply unit matches that of the fuser assembly it goes H when it does not If there is a mismatch the fuser assembly abnormality detect signal FXSTS output from pin 14 on Z5 goes H and the CPU detects the incorrect installation of the fuser assembly as a result e Fuser heater continuity The fuser assembly abnormality detection circuit detects the AC current flowing in the fuser heater If no AC current flows the CPU on the DC controller will determine that the fuser heater wires are broken notify the I O controller of a fuser assembly failure and then shut off the power An abnormality in the AC current sent to the fuser heater is detected by the voltage generated by T2 The voltage value generated by T2 is monitored at pin 10 on Z5 If the fuser heater is broken and no AC current flows Z5 13 will become H and the fuser assembly abnormality detect signal FXSTS output at pin 14 on Z5 goes L When the AC
95. d remove the assembly from the printer Delivery Drive Assembly Hook 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart General About Transfer Drum Peripherals The four assemblies below transfer mechanical drive to the transfer drum and its peripherals Take apart procedures for each directly follow this topic Refer to Chapter 1 for full information on the func tions of these four assemblies Cleaning Drive Discharge Roller Transfer Drum Attraction Roller Assembly Drive Assembly Drive Assembly Drive Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Cleaning Drive Assembly First Remove the top cover left cover rear cover rear shield plate power supply solenoid assembly and main motor Leave the paper pickup block in its out position Now Remove the two silver colored screws and remove the cleaning drive assembly from the printer Cleaning Drive Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Attraction Roller Drive Assembly First Remove the top cover left cover rear cover rear shield plate power supply and solenoid assembly Leave the paper pickup block in its out position Now Remove the two silver colored screws and remove the attraction roller drive assembly from the printer Attraction Roller Drive Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Discharge Roller Drive Assembly First Remove the top cov
96. d solenoids External Device Status Panel O Controller Board I O Interconnect Board Density Sensing Board Cassette Ejection Size Sensing a Sensing Board Board Laser Scanner Assembly Scanner Motor Beam Detect Board Laser Driver Board Various Sensors Main Switch Pickup Motor J Cassette Pickup Board Sensors Solenoids Clutches Toner Carousel Motor Cleaning Brush Motor Various Fan Motors Various Sensor Solenoids Clutches Temperature Humidity Sensor Board Toner Sensor High Voltage Power Supply Mechanical Controller Board Power Supply Low Voltage Power Supply AC Drive Circuit gt Fuser Heaters Upper Lower COO Daar Quwitah 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory DC Controller Board Mechanical Controller Board Outline of Major Circuit Boards This section describes the functions of the DC controller board and the mechanical controller board See Circuit Boards in the Parts chapter for additional information This board controls the printer When the PRNT signal is received from the I O controller the DC controller sends the print sequence command to the mechanical controller which then starts controlling various loads The DC controller also provides e Laser scanner control e Image stabilization control e Fuser temperature control e
97. de a Color LaserWriter 12 600 PS to a Color LaserWriter 12 660 PS by installing version 2 0 ROMs onto the customer s I O controller board The version 2 0 ROM upgrade kit is available as P N 076 0621 The contains eight ROM ICs a user manual addendum a software installation CD and upgrade labels Note Install new ROM only if the customer s printer is exhib iting one of the problems described below Install a replace ment I O controller board P N 661 0133 only if your troubleshooting has found the board to be defective All service stock for the I O controller board will include version 2 0 of ROM After installing the new ROM affix the labels that are provided in the kit as described in the instructions that accompany the ROM upgrade kit Caution All but one of the bug fixes contained in version 2 0 of the ROM also appeared in version 1 2 If your I O controller board has version 1 2 of ROM do not upgrade unless it is specifically for the Windows 95 feature described immediately below You can identify the ROM version by inspecting the margin text on the startup page Plug and play support for Windows 95 Plug and play support means that the user can connect the printer to the system boot Windows 95 and automatically see the printer name in the New Hardware Found dialog box during the installation process After installation is complete the Device ID string and related information will be returned whenever the printe
98. density gauge LED above the word DEFAULT If this LED is off then the density settings have been changed from the default Plus minus buttons Advance the density gauge setting Toner Lights An illuminated toner light indicates the color that is being adjusted 95 08 23 16 19 Color LaserWriter 12 600 PS Basics amp Theory Density Adjustments This feature is offered for customers who have multiple Color Laser Writer 12 600 PS printers in a single location and need to adjust one printer to match the output of another Important The range of settings is limited Use this feature only if you have prior experience in four color density adjustments The printer needs to be switched on and in a ready state to make density adjustments Density adjustments are persistent To adjust the density Press the COLOR SELECT button as many times as necessary until the desired toner light illuminates Selected Color j r DEFAULT 6e8 Press the plus or minus button to change the setting for that color The density gauge LED will light whenever the selected setting differs from the previously entered setting Repeat steps and 2 if you want to adjust other colors Press the ENTER button to engage the settings Note If you want to quickly return the printer to its factory defaults press and hold both the plus and m
99. does not pass through the delivery paper sensor PS9 a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second PRINT Registration Position Transfer Drum Top Sensor PS8 Jam Check Paper Delivery Sensor PS9 Main Motor M2 T6 8 91 15 06 in case of overhead transparencies Unit Second Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Multifed Paper The CPU determines that a multifed paper stationary jam has occurred Stationary Jam if the delivery paper sensor PS9 detects paper a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second PRINT Registration Position Transfer Drum Top Sensor PS8 Jam Check Paper Delivery Sensor PS9 Main Motor M2 Normal T7 0 5 1 0 2 0 3 0 Unit Second PRINT S Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Nondedicated The CPU determines that a nondedicated transparency jam has Transparency occurred if one of the following is sensed Jam e The white band on the leading edge of the transparency is not detected by the paper leading edge sensor PS303 a
100. e Best mode in the print dialog box adds one rotation to the transfer drum see Stage 4 Transfer under Stages of Imaging in Chapter 1 This additional rotation occurs before any imaging to allow the paper to fully adhere to the transfer drum This precaution corrects small registration problems that might occur during the imaging of the magenta layer the first color that is transferred 98 05 08 09 00 Take Apart Color LaserWriter 12 600 PS Take Apart 3 2 General List of Procedures The following pages describe take apart procedures for the Color LaserWriter 12 600 PS Listed below are the procedures in the order in which they appear in this chapter This list is primarily for the benefit of those who have printed this documentation If you are viewing this in Acrobat format from a computer screen you may navigate by bookmarks Select the bookmarks button in the toolbar second button from the left and scroll to find the entry Take Apart Steps Bookmarks remain visible until you close the bookmarks window Note that you can zoom in on all graphics to see more detail Select the zoom button in the toolbar fifth button from the left and click anywhere on a page to zoom in Toner Disposal Box irises raea r beeen ee Rai ae 3 4 Photoconductor Cartridge s ae aar aaa a e ia aeoaea Eea Raai i 3 7 Fuser ACCESS COVEI zarate paraa iy ak rea edia aeea Ee N NNa Sis Ea Eaei eaaa 3 9 Fuser Oil Bottle
101. e after the registration paper sensor PS302 detects the leading edge of the paper Unit Second Unit Second Paper Registration Sensor PS302 Jam Check Paper Leading Edge Sensor PS303 Main Motor M2 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory 1 129 Grip Jam The CPU determines that a grip jam has occurred if the attraction sensor PS6 does not detect the paper a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second PRINT Registration Position Transfer Drum Top Sensor PS8 Jam Check Attraction Sensor PS6 Main Motor M2 Unit Second Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Separation The CPU determines that a separation delay jam has occurred if the Delay Jam paper does not reach the separation sensor PS7 a specified period of time after transfer drum registration position detection in the full color mode the registration position for the fourth color is detected Unit Second Registration Position Transfer Drum Top Sensor PS8 Jam Check Separation Sensor PS7 Main Motor M2 T3 4 17 6 88 in case of overhead transparencies Unit Second PRINT eS Registration Position 95 08 23 11 3
102. e array IC109 in the DC controller contains the halftone correction table see below used to correct the laser output in order to obtain an ideal halftone image The halftone correction control modi fies the halftone correction table to accommodate changes in the present environment the total number of prints or the condition of the toner and the photosensitive drum The laser output and the image density of the printer do not change in a linear relationship Therefore when the laser image is output according to the halftone specified with the video data signal sent from the I O controller an ideal halftone image is not obtained on the actual prints In order to obtain an ideal halftone image the DC controller halftone correction table is used to correct the output value of the laser diode Image Density Real Halftone Curve a Laser Output Maximum density and halftone correction are controlled using the cali bration density sensor PS14 Calibration Density Sensor PS14 Density Sensor Assembly _ _ P N 922 1310 Transfer Drum Density Patches 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory At each of the five intervals specified previously the DC controller prints a series of patches directly onto the transfer drum The light emitted by the PS14 LED is reflected off these patches and back into the photodiode of PS14 The reflective characteristics of colored toner and black toner differ
103. e clicks into place nine separate pins engage These pins assure a solid coupling that is critical to the mechanical functionality of the printer See Toner Cartridge Installa tion for more information Note The home position of the carousel is the same as the magenta fetch position This is the position of the carousel during standby During printing or startup the carousel rotates counterclockwise to bring the cartridge to a position facing the photosensitive drum This is known as the stop position From the fetch to the stop positions the cartridge housing revolves approximately 135 degrees relative to the inner workings of the cartridge Therefore the developing cylinder is fully exposed at the stop position It has not yet meshed with a drive train See Toner Cartridge Stop in the Carousel Rotation section for more information The cartridge press assembly at the center of the carousel keeps its position relative to the chassis and does not rotate with the carousel The moment the cartridge reaches a stop position the press assembly shifts it laterally and presses its developing cylinder against the photo sensitive drum This is known as the press position and is the only stage in which the inner workings of the cartridge are mechanically driven Press occurs first for magenta followed in order by cyan yellow and black See Toner Cartridge Press in the Carousel Rotation for
104. e image is trans ferred to the paper on the transfer drum The surface of the photosensi tive drum is cleaned to remove residual toner and the latent imaging cycle continues These steps are taken for each color The paper is fed onto the transfer drum and remains there until the transfer process has been completed The paper is then separated from the transfer drum and is delivered to the fuser assembly 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory The transfer drum is also cleaned periodically to remove toner However its surface is discharged to eliminate remaining charges See Imaging Stage 4 Transfer Drum Cleaning and Discharge later in this chapter Toner Cartridge Photosensitive Drum Separation Claw Paper Cleaning ist Color Transfer Drum Cy Brush Discharge Roller Attraction Roller lt JO 2nd Color SION O OC 3rd Color a j S ys 4th Color amp O om P 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Photoconductor Cartridge Outline The photoconductor cartridge comprises the primary charging roller photosensitive drum and cleaner unit Cleaner Primary Charging Roller The external surface of the photosensitive drum is a photoconductive layer using an organic photoconductor OPC and the inner side is an aluminum substrate The primary charging roller is formed with rubber of medium resistance and operates i
105. e of the small plastic feet found on the bottom of the printer Engineering is working to identify and make available shims specially designed for leveling the Color LaserWriter Continue to use one or more of the readily available items listed above until the new shims are available Front __ Rear f tams i e oe e pa ea T aa a Ye Figure 4 Side view of printer with leveling diagram Pump The Fuser Jam Release Lever To Remove Excess Oil Open the fuser access door to locate the teal green fuser paper jam release lever Pump the lever at least 50 times to manually remove excess oil from the fuser assembly oil catch tray and move it back to the oil reservoir Under most circumstances this action will allow the oil overflow sensor flag to drop back to its normal operating position Push Down The Floating Oil Overflow Sensor Flag To Reset The Error To insure that the previous error condition is cleared use a finger or other blunt object to gently push the oil D overflow sensor flag down to its normal position The Faunia seronoe eet mecaconinteeo Aik TRER sensor flag floats on top of the oil in the fuser oil catch oo oo a tray beneath the PS10 photosensor To access it open the fuser delivery door so that the PS10 photosensor mounting bracket is exposed The sensor flag is located behind the mounting bracket see Figure 5 This step may not be necessary in all cases Caution Allow adequate time for the fuser ass
106. e spacers and the oil absorption sheet from inside 96 11 13 15 58 Color LaserWriter 12 660 PS VO Controller Board Changes Driver Software LaserWriter Color 12 660 PS 3 4 2 Open the fuser assembly and remove the oil absorption sheet from the inside of the fuser assembly The Color LaserWriter 12 660 PS comes standard with 16 MB of DRAM and version 2 0 of ROM All other characteristics of the board remain the same Note Version 2 0 of ROM contains fixes for variety of system and networking bugs that have been reported since the release of the original printer I O controllers with 2 0 ROM will also output new startup and demo pages If you want to upgrade an existing printer see Upgrade Path later in this chapter The new version of the Color LaserWriter printer does not require a driver upgrade However the printer name has changed in ROM Consequently with older drivers you must manually select the LaserWriter Color 12 600 PS PPD when setting up the new printer in the Chooser Alternately if copy the new LaserWriter Color 12 660 PS PPD into the Printer Descriptions folder path System Folder Extensions folder Chooser setup will be automatic This PPD can be found on the Service Source CD path Service Manuals Clips CLW 12 660 PPD 96 11 13 15 58 Color LaserWriter 12 660 PS A Feature added in ROM v2 0 System bugs fixes in ROM v1 2 Upgrade Path You can upgra
107. e time elapsed after the power is shut off see note 2 on the next page If a fuser heater error occurs and then the power is turned on within 30 minutes of having been turned off the DC controller will determine that the temperature of the fuser heater is not low enough and keep the fuser heater off The DC controller recognizes any of the following situations as a fuser heater error e When the power is turned on a fuser assembly error is found stored in the DC controller e Sixty seconds after the power is turned on the value of the fuser temperature detect signal THI sent to the CPU on the DC controller has not changed e After the fuser heater is turned on any of the following phenomena occur The temperature of the fuser heater does not reach 40 C within 130 seconds The temperature of the fuser heater does not reach 60 C within 80 seconds of reaching 40 C The temperature of the fuser heater does not reach 80 C within 80 seconds of reaching 60 C The temperature of the fuser heater does not reach 100 C within 80 seconds of reaching 80 C The temperature of the fuser heater does not reach 120 C within 80 seconds of reaching 100 C The temperature of the fuser heater does not reach the target value within 160 seconds of reaching 120 C e The temperature of the fuser heater falls below 120 C after it has already reached the target value e The temperature of the fuser heater exce
108. ecccseseesseeeeneeeeeeeeseeceaeeeaeeesaeesaeeseaeesieeseaeeenaees 3 146 Sheet Feeder Left Cover ccesceesccseseeeseeteneeeeeeeeseeseaeeeaeessaeeseeeseaeessaeeeeeeaees 3 147 Sheet Feeder Right Corner Cover ceccececceeeeeeeeeeeeeeeeeeeeaeesieeseaeesseeeeeesaees 3 148 Sheet Feeder Side ACCESS Cover ceeceeeeeeeeeeeeeeeteeeeeeeseaeeseeeeaeesieeeeeeenates 3 149 Sheet Feeder Pickup BIOCK cc cescesseeeeeeeeeeeeeaeeceaeeeaeeseaeesaeessaeeseeeeeeeaees 3 151 Sheet Feeder Front Paper Pickup Assembly cecceseeeeeeeteeeeeteetetees 3 153 Sheet Feeder Rear Paper Pickup Assembly eecceeeceeeceeeeteteeeeeneetseteees 3 154 Oil Overflow Sensor PS10 eeeeeceesceeeceseneeeeeeeeaeeceaeeeaeeseaeesaeesnaeeseeeeaeeeaees 3 155 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart 3 4 First Toner Disposal Box page 1 of 3 No first steps are required Note This part is available as P N 922 1546 Two toner disposal boxes are also included in Photoconductor Replacement Kit Finished Goods P N M3761G A 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Toner Disposal Box page 2 of 3 Now 1 Open the front door Lower the transfer drum lever and raise the disposal box cover Disposal Box Cover Transfer Drum Lever 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Toner Disposal Box page 3 of 3 2 Pull the t
109. ect J1602 from the ejection sensing board Remove the black screw and lift the board from the mounting Screw J1602 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart First Now Cassette Size Sensing Board page 1 of 5 Remove the paper cassette toner cartridges front door inner panel 1 toner carousel guide panel top cover left cover and toner release assembly 1 Disconnect J1601 from the ejection sensing board J1601 Ejection Sensing Board 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Cassette Size Sensing Board page 2 of 5 2 Remove the brass colored screw and pull the ejection cassette sensor assembly from the printer Screw Ejection Cassette Sensor Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Cassette Size Sensing Board page 3 of 5 3 Disconnect J1602 from the ejection sensing board and free the cable from the cable guide J1602 Cable Guide 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Cassette Size Sensing Board page 4 of 5 4 Release the tab and snap the sensor housing upward and out of the metal plate 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Cassette Size Sensing Board page 5 of 5 5 Release the two tabs and remove the cover Disconnect J312 release the tab and remove the cassette size sensing board Tabs 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Po
110. ed If the problem persists replace the power supply 98 05 08 09 00 Color LaserWriter 12 600 PS Flowchart C Troubleshooting Power is getting into the printer but the printer isn t coming ready Is there a very loud grinding sound coming from the carousel Do all 21 status panel lights come on and stay on Are all four primary lights flashing ee eS Are any of the three error lights illuminating or flashing Qe E E YES If you have gotten to this point without resolution of your problem go to the Symptom Driven Troubleshooting section of this chapter and see if your specific symptom is addressed See Symptom Driven Troubleshooting in this chapter This indicates that the I O controller board is not installed or is failing Check that you have installed the board completely into the printer and that it has mated solidly into the inter connect board If the problem persists replace the I O controller board See POST in this chapter See Status Panel Lights on page 1 12 of the Basics and Theory chapter 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Flowchart D The printer comes ready but secondary lights are illuminating YES These lights come on to alert the user to order a replacement part The fuser assembly light comes on when clea
111. eds 200 C during the standby or print period the fuser heater malfunctions 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory When the THI signals are compared after changing the sensitivity of the thermistor see note 3 below from the high range to the low range there is almost no difference recognized the wiring for the thermistor is broken Notes 1 Ifa failure occurs in the fuser heater do not turn on the printer power switch for about 30 minutes Even if the power switch is turned on during this time period the CPU determines the fuser heater failure has occurred and the fuser heater will not be turned on to prevent it from overheating Discharging jumper JP102 on the DC controller board will reset this circuit The off timer circuit on the DC controller board can measure the lapse of time after the power is turned off The measured time is used for release of fuser assembly errors and for tempera ture humidity sensing While the power is turned on the CPU IC101 sets the off timer charge signal TCCHG to be output to IC102 to L to charge C106 After the power is turned off C106 begins to discharge DC Controller Board Off Timer Circuit IC101 5V 1C102 TCCHG f CPU wigs When the power is turned on again the CPU detects the voltage of C106 with the off timer sense signal OFTMR sets the TCCHG signal to L and charges C106 to the specified voltage Then the off timer dis
112. eed When the scanner motor drive signal SCNON and the scanner clock signal SCNCLK are sent to the scanner driver by the DC controller the scanner driver rotates the scanner motor Laser Scanner Assembly Scanner Mirror SCNRDY DC SCNON Controller SCNCLK Board 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Scanner Motor Circuit The scanner motor is a three phase 8 pole DC brushless motor with a hall element It is incorporated in a single unit with the scanner driver which controls it so that the motor rotates at a constant speed When the printer is turned on the oscillation frequency of the crystal oscil lator X103 is divided by the gate array IC109 and the resulting signal is sent as the SCNCLK signal to the scanner driver When the PRNT signal that is sent to the CPU IC101 on the DC controller goes L the CPU sets the SCNON signal to L via the gate array and rotates the scanner motor When the scanner motor reaches the specified speed the scanner motor ready signal SCNRDY goes L The CPU on the DC controller issues the print sequence command to the CPU on the mechanical controller when the SCNRDY signal goes L The CPU on the DC controller monitors the SCNRDY signal via the gate array to determine whether or not the scanner motor is rotating at the specified speed If the scanner motor fails to reach the specified speed within 30 seconds after it
113. eeeeeeeeeeee 1 48 Stage 2 DEVElOPING a a a a E Ta aaaea RE eaaa E PO aaa lies 1 50 Stage 3 Photosensitive Drum Cleaning 0 0 cceeeceeeeeseeeeeeeseeeeneeeneeeees 1 51 St ge 4 Transier 2 cscaie ihn ian Nee ee 1 53 Stage 5 Transfer Drum Cleaning and Discharge cceeceeeeeeeeeereee 1 57 Stage 6 FUSING ciency i tine iit atin Sens keeles 1 59 High Voltage Control je ccs tle eecese tess Geeth did nveeenteaebed cesaeestiecsidie cite 1 60 Photosensitive Drum Life Detection 2 0 0 ee eeeeeeeeseeeeeeneeeeseeeseneeeeeeeeeenaeeees 1 68 Toner Carousel Control ccecceesceteeeeesceeeaeeseeeeeaeeceaeeeaeeeaeesseeseaeeseeseaeeeseeteaes 1 71 Toner Cartridge Installation 2 0 ceeceeeseceeeeeneeeeeeeeeeeseeeeeeeteeeeeeeseaeeeeenea 1 73 Carousel ROATION se ssi osiin orsa arees enai A Tee a oiee E aoa San 1 75 Toner Cartridge Stopis ei eaei eaa ea beeen Alaina 1 79 Toner Cartridge Pre S a a crease seine a aa aee A Ae R AEE sauces 1 80 Developing Cylinder Drive e cc ecceeeceeeeeeeeeeeeeeeeeeeeeeeseeeeseeseaeesieeeeieetaees 1 81 Toner Cartridge Separation oo eeeeeeceeeeeseeeeeeeeeeeeeeneeseeeeeaeeseeeeeeeseaeeeeeeea 1 82 Image Quality Stability Control oo ec eee eeeeeeeeeeeeeeeeeeeaeeseeeeeaeeeeeeeeneeseneeeaes 1 84 Temperature Humidity Sensing System cceecceeseeeeeeeeeeeeeeeeeneeteeeeeeeeee 1 85 Density Calibration System ec eeeeeceeeeeeeneeeeeeeeeeeeeeeseeeeseeeeaeesneeeeaeeeaees 1 86 95 08 23 11 28 Col
114. eeeeeeeneeeeeesneeteeeeeees M0435ZM A Apple SCSI Cable Extender cccceecseeeeeseeseeeeeneeeeneeeneeeeneeteeeseates M0208 Apple SCSI Cable Terminator II Black eecceseeeeseeeeeeeeteeeeeeeeneees M5871G A 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Sheet Feeder Exploded View 922 1355 Sheet Feeder Controller Bd 922 1356 661 0932 Sheet Sheet Feeder Power Supply Universal Feeder Cassette 922 1358 Front Pickup Assembly Sheet Feeder 922 1360 Feed Roller 922 1361 Front Roller 661 0908 Mists ae Sheet Feeder Whole Unit k 2 922 1362 oN v 922 1359 Rear Poller Rear Pickup Assy Assy Sheet Feeder 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Switches Locations The illustrations below show switch locations for the Color LaserWriter 12 600 PS and the optional sheet feeder x ia a SW2001 CSW3 Ma lt gt SW1601 P wee cswe Q gt D csw Q sr Swi S csws02 d csw301 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Descriptions The table below describes the switches for the Color LaserWriter 12 600 PS and the optional sheet feeder Designation Name Availability SWw1 Power switch P N 922 1320 SW2 Door switch P N 922 1351 e An actuator on the front door P N 922 1317 strikes a transfer rod that is in contact with the door switch assembly e An actuator on the fuser
115. eganesseg OOW AM Md Soo sor ever ryt yO ONY ES dat B28 or NOG3T v NOdId5 ae wa EES ax SNSLIV no an K Zz ND 2isd peog Yous SSd Pas POSSI sosueg 9S UIsuag 821S sosuas 119g er seer Weve Sd onsen 18u01 ASEM ayjasseg Bujueajo JOsuas IIO al 38d 98 05 08 09 00 zoer youms Buisuesg PPP 8ZIS y sseg A ddng samog oger ololo PAKARO D S WO SIRIS A D Tho leo a CLEP Ino foo fx PEP B W p F O IM oser sser pan S355 0 DOH D BRBZ gees NNNY SSos A 2 ggg Adee DO D mm 5 LL SRR Q H z je L io Sau 8 D Z D N 5 Tas Z Pleog J9 O4JU0D 19p394 4 4S YoUMS 100q 4 H Te 7p 5 ON 9 Z0EMS J a AS g yoyums juawisnipy O IS oO aN 5 v uonensib y apis C o 2 9 ar LOEms a a ax z A oo axl I 4 A gt _ m S zser bse m2Oh2o oorsaa as 2a 6NG 2wo0oo0o0o us S D ae o a eo eset Tele la lo raer AT l 2 BIO My Q eser o LAT sger as LSETS 5 5 7 a l plougjos pee y sseg T osis PE pa JOSUaS 2 s deus Jaded anesseg an 2 l EVAZ y JOJO 19p994 sedeq E 2 je 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Roller Diameters General Horizontal print defects that occur repetitively over a single page are almo
116. embly to cool before performing this procedure Figure 5 PS10 Sensor Flag Location Page 2 of 2 Color LaserWriter 12 600PS Circuit Breaker Reset Procedures In order to access the circuit breaker the rear plastic cover must be removed so that the main power supply is exposed The circuit breaker itself is hidden but there is a small oval hole cut in the power supply sheet metal which can be used to view whether or not the circuit breaker needs to be reset Once the hole has been located see pictures below check to see whether or not the yellow plastic indicator from the circuit breaker is visible If it is visible then the circuit breaker needs to be reset using the procedures listed below Circuit Breaker Normal j x Indicator move to right to reset the circuit breaker Circuit Breaker Access Hole Procedure 1 Remove the rear plastic cover to expose the main power supply 2 Use a small non conductive wood or plastic probe i e toothpick ball point pen cap to gently move the yellow plastic circuit breaker indicator to the right until it is no longer visible 3 Reinstall the plastic covers and test the printer If the printer continues to trip the circuit breaker then an overload condition still exists Consult the Service a ae AN Source troubleshooting documentation for additional nate assistance Service Source Exploded View Color LaserWriter 12 600 12 660 lt a gt Exploded View
117. eptional rota tional force is required because the carousel s center of gravity is out of center Since the mechanical controller cannot recognize whether all cartridges are present or not during operation of the toner cartridge detection function the CPU reduces the toner carousel rotation rate by setting the DEVICH signal to H to drive the toner carousel motor at half speed Mechanical Controller Board 5V Toner Carousel CPU Motor Driver Q2003 24VC Toner Carousel COMA J2016 1 Motor COMB 2 60 DEVPHA AO 8 5g DEVPHA TAO 4 5g DEVPHB BO 5 57 DEVPHB IBO 6 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Image Quality Stability Control Outline The printer is protected by an image quality control system that mini mizes image density fluctuations caused by environmental changes photosensitive drum wear and degradation of toner Intervals Image quality stability control is performed at the following intervals e When the power is turned on e When the printer encounters an abrupt environmental change e Following every 100 prints e When a toner cartridge is installed e When anew photoconductor cartridge is installed Temperature Humidity Environment change correction control start 9 Sensing Environment detected Primary charging voltage determined Transfer bias determined Discharge bias determined Attraction bias determined Sepa
118. er and rear shield plate Now Remove the black screw and the plastic bezel Remove the two silver colored screws disconnect connector J1 on the back of the density control panel and remove the panel from the printer Screw Bezel Connector Density Control Panel Screws 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart I O Interconnect Board First Remove I O controller board front door top cover status panel bottom cover and I O interconnect shield Now Disconnect the connectors from the I O interconnect board Remove the five silver colored screws and remove the interconnect board from the printer n Do u I O Interconnect Board 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart DC Controller Board page 1 of 5 First Remove the I O controller board front door top cover left cover rear cover rear shield plate status panel bottom cover and I O interconnect shield Important The DC controller board stores important information about consumables and other customer specific parameters If you are replacing the DC controller board you must first download these parameters from the old board so that you can upload them to the replacement board For more information see Diagnostic Utility in Chapter 2 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart DC Controller Board page 2 of 5 Now 1 Disconnect connectors J2007 and J2010 from the mechanical controller board
119. er left cover rear cover rear shield plate power supply and solenoid assembly Leave the paper pickup block in its out position Now Remove the two silver colored screws and pull the discharge roller drive assembly out of the printer Discharge Roller Drive Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Transfer Drum Drive Assembly First Remove the top cover left cover rear cover rear shield plate power supply and solenoid assembly Lower the transfer drum lever Leave the paper pickup block in its out position Now Remove the two silver colored screws and remove the transfer drum drive assembly from the printer Transfer Drum Drive Assembly Replacement Note Make sure that the shaft is properly seated in the white bushing at the front side of the printer 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Transfer Drum Cleaning Assembly page 1 of 4 First No first steps are required Now 1 Open the pickup block cover Release the green lock levers at each side of the pickup block and slide the block out Lock Lever 95 08 24 14 47 Color LaserWriter 12 600 PS Take Apart Transfer Drum Cleaning Assembly page 2 of 4 2 Remove the connector cover at the right end of the assembly and unplug the connector _ A EL
120. er carousel motor M3 delivers developing cylinder drive at this point Developing Cylinder This mockup does not show toner carousel and photosensitive drum After the toner cartridge is pressed against the photosensitive drum the mechanical controller rotates the toner carousel motor The toner carousel motor drives the developing cylinder in the toner cartridge by means of the large white gear on the printer drive assembly into which the photosensitive drum mates Note The photosensitive drum is driven by drum motor M3 Though the drum and carousel motors use separate drive trains they are deliv ered in synch by the mechanical controller board Upon completion of the developing process for the designated color the mechanical controller sets the developing rotary brake signal DEVBRk to L and the toner carousel brake clutch CL1 to on to apply a brake The toner carousel motor then stops and the developing cylinder ceases to rotate 95 08 23 11 30 Basics amp Theory Color LaserWriter 12 600 PS The toner cartridge separates from the photosensitive drum after the Toner Cartridge development process Separation pang Phot sensitiv S ww M Drum s EN Wy S 2 5 ee ny lt nm Annnnnnnnnnnnnnnnnnnnn a Actuator 1 of 2 Gear Actuator 1 of 2 Gear Actuators and Gear After Separation Actuators and Gear During Press After the developing cylinder ceases to rotate the
121. er transfer SL4 is turned on to open the gripper The separa tion claw drive solenoid SL5 is also turned on to actuate the separa tion claw The paper is separated from the transfer drum and then fed to the fuser assembly If the paper fails to reach or pass through each sensor within the speci fied time the CPU on the DC controller determines that a jam has occurred and notifies the I O controller 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Gripper Control The opening and closing of the gripper are controlled by the gripper drive signal GRIPON sent from the mechanical controller When the GRIPON signal turns H the gripper solenoid SL4 is turned on and the gripper drive cam is pressed Meanwhile the gripper drive arm in the transfer drum rotates around the transfer drum shaft along with the transfer drum rotation When the gripper arm is pressed against the cam projection it pushes up the gripper lever to open the gripper The gripper drive cam projection separates from the drive arm in accor dance with the rotation of the transfer drum closing the gripper More over since the cam is separated from the gripper arm while the GRIPON signal is L the gripper does not open Gripper Gripper lever Gripper Solenoid Gripper SL4 Drive Gripper Drive Cam 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Attraction Roller The attraction roller
122. ette Pickup Board Pickup Motor CPU Driver 24V IC301 IC302 eye 7 Pickup CA J304 a Motor AO 5 AO 6 BO 3 BO 4 Note The pickup roller rotates to the initial position upon power on and door open close 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Outline Transfer Drum and Peripherals The transfer drum is the mechanism that enables multiple pass printing It clamps the leading edge of the paper by means of a solenoid actuated gripper attracts and holds the paper to its surface and then carries the paper past the photosensitive drum where toner transfer occurs In full color mode toner transfer occurs four times per page while in the monochrome mode transfer occurs once The transfer drum is surrounded by the attraction roller the photosensi tive drum the discharge roller the cleaning brush and the separation claw These components are controlled by the mechanical controller DC Controller Board A Mechanical Controller Board ee a oe z amp Z N n gt Z og aS Z Cc oo Z Zz Zz i fe 9 CO _ beg o ag ses BO 9 n SHlE o w n 7p FE em im z So n O El gt oO ow q D BA GBS 20 Ee 2 Q Oris n Ox 3 2 QA Q 1 a Va l wa vaya gE Saat a oO oc aS t al 5 c oO e OD D gt s oD 20 D z5 D 5 c ie D D op D e9 op E nl oO Z S is n n o 5 Q ol E 2 a D 8 oO 5
123. g transfer discharging attraction and separation Separation high voltage transfer board Outputs separation voltage to the fuser assembly and the separation discharge assembly Cassette pickup assembly board Controls the pickup system loads Cassette size sensing board Detects the cassette size Ejection sensing board Detects the pulling of the toner release handle Sheet feeder controller board P N 661 0133 P N 922 1319 P N 661 0898 P N 661 0899 P N 661 0905 P N 922 1610 P N 922 1311 P N 922 1623 P N 922 1623 P N 922 1355 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Connector Locations 1 of 3 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts 20f3 J J303 902 Je Bog a aE S N bn oe Sh ye S S i 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts 3 of 3 96 05 15 10 25 Bulletins HES Leveling Instructions 3 15 96 Almost any non compressible flat object can be used as a shim when leveling the Color LaserWriter Items commonly found at customer locations which can be used include Post It Notes note cards paper magazines etc Other materials that can be cut to size include wood plastic and metal Post It Notes work well because the shim height can be easily adjusted by tearing off or adding pieces of paper Install the shims under one or mor
124. g the internal workings of the cartridge If the printer has been operational and this problem arose suddenly place the printer into a validation state see Verifying Printer Opera tion in this chapter Examine the carousel manual rotary assembly and the carousel interlock Remove the toner release assembly if you need more space to clear blockage 4 The paper intermittently jams at the separation claw or doesn t come off the transfer drum at all The problem might be environmental Force the separation voltage on see Density Control Panel in Chapter 1 and see if the problem improves This setting will not persist after printer shutdown so it will need to be reentered 5 Desktop printing software was not installed What can I do to get it Desktop printing software requires System 7 1 1 Finder 7 1 3 or later If you have System 7 1 then Print Monitor 7 1 2 has been installed To get desktop printing capability install System 7 1 1 or later and rein stall the Color LaserWriter 12 600 PS software 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting 6 Printer empties paper tray of paper Output is blank Restart the printer and check the calibration patches as they are printed on the drum see Troubleshooting Verifying Operation Imaging by opening the top of the printer If the patches are bands of toner extending across the drum replace the Laser Scanner unit 98 05 08 09 00 Color LaserW
125. generated it informs the mechanical controller CPU in the printer of a sheet feeder 24 V failure The mechanical controller noti fies the DC controller which then reports an internal communication failure to the I O controller Sheet Feeder Power Supply D Power Source AC in Printer Power PUS Outlet Sheet Feeder Controller Board Filter 5V Remote Phototriac T 5V IC30 p Power td see a Mechanical ircui Bi Controller Door Switch Board SW302 in Printer 24 VA 5 V Power Source gt gt S wr y X Sensors Solenoid Motors 95 08 23 11 31 Troubleshooting 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting I Using This Chapter This chapter is divided into four sections Preparation and Tips This section contains troubleshooting checklists list of recommended tools circuit diagrams and tips If you are working on a Color Laser Writer 12 600 PS for the first time please take time to read the topic Verifying Printer Operation This topic discusses how to place the printer in an open operational state Startup Tests and Diagnostics This section describes the Power On Self Test and the Color Laser Writer Service Utility II Flowchart Troubleshooting This section is geared toward a procedural approach to troubleshooting If you do not know where to start or you want to verify printer opera tion after servicing go to Flowch
126. h CSW301 2 j CSW303 4 CSIZE2 Detect cassette size 06 4 CSIZE3 a rir Mechanical J351 1 to 8 ei Serial Communications in Printer 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Outline Pickup Operation Detecting Jams Pickup Feed System The sheet feeder pickup roller is driven by the sheet feeder motor M6 The sheet feeder motor is controlled by the sheet feeder motor driver IC on the sheet feeder controller board The cassette pickup solenoid is controlled by the sheet feeder driver IC on the sheet feeder controller board When the print sequence command is received the mechanical controller in the printer rotates the main motor M2 The sheet feeder controller board in the sheet feeder rotates the sheet feeder motor M6 at high speed Simultaneously it turns the cassette feed solenoid SL351 on to rotate the sheet feeder pickup roller Thus paper is picked up After any multifed sheet is separated by the separation roller the paper is fed into the printer by the feed roller The sheet feeder controller board detects the paper leading edge with the pickup sensor in the feeder and changes the speed of the sheet feeder motor to normal when the paper reaches feed roller 2 in the printer pickup block Thus one sheet of paper is picked up from the cassette in the sheet feeder The following table shows the settings of the cassette size sensing switches Cassette Si
127. he drum This is referred to as the unblanking period This causes the laser diode to emit the laser beam at the intensity set during the initial APC To ensure that the PDIN signal is at the specified value the APCLW signal 8 bit is changed to correct the LLCNT signal so as to compensate for the offset from the target value A small beam detect BD mirror is fixed in the optical path of the laser beam Upon reaching the scanning start position the laser beam is reflected by the BD mirror to the BD board in the laser scanner assembly during the unblanking period On receiving the laser beam the BD board generates the beam detect input signal BDI and then sends it to the gate array in the DC controller board The gate array produces the horizontal sync signal LSYNC based on the BDI signal and then sends it to the I O controller 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Laser Diode Emission Control The laser driver circuit turns the laser diode on or off in accordance with the laser drive signal received from the PWM IC when the video enable signal VDOENB is L and the forcible laser on signal LSON supplied by the DC controller is H The gate array IC109 applies left right and top bottom margin masking to the video signals VDO7 VDOO in accordance with the paper size data sent by the I O controller and then sends them as DV2 DV9 signals to the PWM IC in the laser scanner asse
128. he high voltage power supply from the inside of the chassis 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart General About Solenoids There are nine solenoids in the Color LaserWriter 12 600 PS and one in the optional sheet feeder Five of these are available only as a part of larger assemblies see Solenoids Clutches in Chapter 4 The five solenoids listed below are available separately Cleaning belt drive solenoid SL3 Solenoid SL3 is located in the upper rear of the printer to the right of the paper delivery assembly See the Cleaning Belt Drive Solenoid topic that follows for take apart instructions Attraction roller press solenoid SL6 Transfer drum press solenoid SL7 Transfer drum cleaner press solenoid SL8 Discharge roller press solenoid SL9 The last four solenoids are mounted together on a plate located above the power supply You must first remove this solenoid assembly from the printer before you can remove any of the individual solenoids See the Solenoid Assembly topic for take apart instructions 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart First Now 1 2 Cleaning Belt Drive Solenoid Remove the top cover Remove the two silver colored screws and disconnect the connector on the rear face of the transit coupling Lift the cleaning belt drive sole noid from the printer Advance Lever Cleaning Belt Rotator Arm Drive Solenoid Connector Replacement Note
129. he oil catch tray is equipped with an oil overflow sensor PS10 A floating ball with a flag is floated in the oil catch tray and as the oil level rises the flag interrupts the sensor and the oil overflow sensor signal OILFUL sent to the mechanical controller goes H When the DC controller is notified of the overflow of oil by the mechanical controller it stops the printer and issues the oil overflow signal to the VO controller If the OILFUL signal continues to be H for 2 seconds or more the DC controller notifies the I O controller that an oil over flow failure has occurred Cleaning Belt Oil Nozzle Oil Applying Roller Applying Blade Oil Pan 1 Oil Bottle __ Filter Oil Low Sensor ee aan PS13 e 4 Oil Pan 2 a ae Secor 0 Reservoir Mechanically Driven Note Only the floating ball actuator portion of oil low sensor PS13 is within the fuser assembly The sensor portion is in the oil sensor assembly which is mounted on the chassis behind the fuser 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fuser Cleaner Assembly The printer uses a cleaning assembly to clean the upper fuser roller This assembly comprises a cleaning belt winding roller a cleaning belt roller and a rolled cleaning belt After every seven prints the cleaning belt winding roller rotates a
130. he top cover left cover rear cover and rear shield plate Now 1 If you are replacing a faulty fan disconnect J2019 from the mechanical controller board release the two tabs and remove the fan If you are removing the fan to get to a deeper part begin at step 2 Tab Main Fan Tab Replacement Note Install the fan with the vendor label facing out 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Main Fan FM2 page 2 of 3 Note For clearance purposes you must loosen the I O board housing so that you can perform step 3 2 Remove the four rearmost screws that secure the I O board housing to the chassis Raise the I O board housing slightly and hold it while you performing the next step I O Board Housing a gt a 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Main Fan FM2 page 3 of 3 3 Remove the mechanical controller mount and board remove the two brass colored screws and disconnect the three connectors below the duct Grasp the fan duct lift upward to release the two claws and remove the fan and duct from the printer Claw Fan Duct 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart I O Controller Fan FM3 page 1 of 2 First Remove top cover left cover rear cover and rear shield plate Now 1 Disconnect J2010 from the mechanical controller board Remove the black screw and the plastic bezel Screw Bezel I O Controller Fan 95 08 23 09
131. htened after installation On site check to see if the fuser bulbs glow during warmup If the bulbs glow the power supply is probably okay and the thermistor within the fuser assembly is bad This suggests replacement of the fuser assembly If the fuser bulb doesn t glow either fuser bulb circuitry is blown inside the fuser the power supply is faulty or a connection or cable is bad First check that J1 the 4 pin black and white cable and J2 the 9 pin yellow cable are secure at the power supply 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Note 5 Movie If the connectors are secure remove the fuser assembly and measure continuity between pins 1 and 2 and then between pins 3 and 4 on the fuser assembly J21 1 J21 2 Receptacle connector on back of fuser assembly removed from printer J21 3 J21 4 A lack of continuity at either point indicates that the fuser heater circuitry is broken in which case you should replace the fuser assembly If continuity is confirmed replace the power supply The DC controller has detected that oil overflow sensor PS10 is returning low This is consistent with a condition in which the oil in the overflow pan floats the actuator upward into the photo interrupter Note If your printer persists in this problem order the level and shim kit P N 076 0622 to assure that the printer is properly levelled For more information see Overview in the
132. hts illuminating or flashing u Go to Flowchart D Did the printer print the startup page s Go to Flowchart E Is the print quality of the page okay See the Symptom Driven Troubleshooting section of this chapter Does the printer print correctly from a host computer Go to Flowchart F If you are having a problem that is not addressed in this flowchart go to the Symptom Driven Troubleshooting section of this chapter 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Flowchart B No power is getting into the printer Make sure that the line voltage is present and that the printer is plugged in problem first appear following take apart and reassembly of the printer YES NO Check the following connectors and make sure they are securely attached The connector on each side of the transit coupling behind the power supply e Connector J4 and J6 at the power supply e Connector J101 at the DC controller board this is the connector that carries the power on power off signals Vv Is the circuit breaker thrown You can tell by looking through a small cutout in the power supply right above the power plug If it is thrown reset it and switch on the printer again If the circuit breaker is thrown again check to see whether the AC power is short
133. inus buttons for at least five seconds 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Test Page Pattern Selection Usage Tips This feature allows you to select one of six test page patterns based upon which one would best confirm a print quality issue Test pattern selection is nonpersistent After restart the test page reverts to the vertical line pattern To select a pattern Hold down the COLOR SELECT button and press the ENTER button eight times The four toner lights will flash to indicate that you are in the test pattern selection mode il c m LAG COLOR SELECT DEFAULT ENTER p 7 CDE Using the plus or minus buttons advance the density gauge to illumi nate the LED corresponding to the desired pattern The density gauge will flash when the selected setting differs from the previously entered setting Only LEDs 4 through 9 on the density gauge correspond to available patterns q D W Grid Vertical Horizontal Gradation Solid Solid Lines Lines White Colors Press the ENTER button to engage the setting If you make no further adjustments the panel will exit from the test pattern selection mode in 30 seconds Each pattern will inherently reveal a different type of defect For example color registration problems a
134. ion system the laser scanner system and the paper pickup feed system Overall Control System I O Controller Board To I O Interconnect Board External Device DC Controller Board Mechanical Controller Board Laser Scanner Assembly Paper Pickup Feed System Scanner Motor a Beam Face Down Tray Position Detector Scanning Mirror Cleaning Unit Primar E Charging Separation Delivery Roller Discharge re Assembly M Photo sensitive Drum Transfer Toner Drum Carousel gt Cleaning Transfer Drum Assembly Discharge Roller Manual Feed Tray Image Formation System Attraction Roller Sheet Feeder Optional 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Outline of Electrical System The operation sequence for the printer is controlled by the microcom puters on the DC controller and the mechanical controller boards When the printer is turned on and enters the standby state the micro computer on the DC controller sends signals for driving the laser diode fuser heaters and other loads in response to the print signal entered from the I O controller board Simultaneously the microcomputer on the DC controller sends the print sequence command to the microcom puter on the mechanical controller Subsequently the latter microcom puter outputs the signals for driving various loads including the high voltage power supply motors an
135. is pressed against the photosensitive drum Cartridge A g Press otosensitive Drum Press Drive Gear Toner carousel motor M3 delivers cartridge press drive through this gear Press Cam Actuator 1 of 2 After the toner cartridge comes to a stop facing the photosensitive drum the mechanical controller reverses the toner carousel motor The cartridge press cams are driven by the toner carousel motor via the press drive gear The four cams press the cartridge against the photo sensitive drum by means of two actuators When the cams are about to turn the controller sets the rotary brake signal DEVBRK to H and turns the toner carousel brake clutch CL1 off to release the brake Example The press cams rotate between frames 56 and 57 of the ag animation and press the magenta cartridge against the photosensitive r drum Animation When the controller detects that the cartridge has begun to leave its bay the controller measures the amount of the drive to the pressing position and stops the toner carousel motor according to that timing 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Developing The toner carousel motor rotates the developing cylinder Cylinder Drive Photosensitive Drum Stirring Plate Developing Cylinder Toner Feed gt Roller Photosensitive drum receives rotational drive through the coupling at the center of this gear Ton
136. iter 12 600 PS Basics amp Theory Step 10 Discharge Animation AC bias is applied by the discharge roller to eliminate charges remaining on the transfer drum surface after the separation of the paper The value of the AC bias varies in line with the temperature humidity sensing system Transfer Drum Discharge Roller Rotates by Friction AC Bias ITT Note For more information see Discharge Roller in the Pickup Feed System section of this chapter Example The discharge roller presses against the transfer drum in frame 228 of the animation just after the trailing edge of the paper has passed The assembly separates from the drum in frame 280 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 11 Fusing Stage 6 Fusing In the transfer stage the toner image transferred onto the paper adheres to it only by means of static electricity and is susceptible to distortion when touched by hand To avoid this problem the fuser assembly fuses and mixes the paper and the four toners to create a permanent image Note For more information see Transfer Drum Cleaning Assembly in the Pickup Feed System section of this chapter Upper Upper Heater Fuser Roller Toner WwW Paper Lower Heater D Lower DC Bias Fuser Roller IIT 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory High Voltage Control Ou
137. ith average page coverage of 5 Photoconductor cartridge 40 000 pages black and white or 10 000 pages color for continuous printing 13 000 pages black and white or 6 500 pages color printing only single page documents Fuser oil life 10 000 pages Fuser assembly life 60 000 pages Transfer drum cleaner life 60 000 pages Ozone filter life 60 000 pages Air filter life 60 000 pages Separation Discharge Assembly life 60 000 pages 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory Speed Printing Materials Transparencies Paper Sizes and Capacity Suggested Paper Brands Prints 12 pages per minute in monochrome 3 pages per minute maximum in color and page per minute for transparencies Actual speed depends on the images printed and paper size Uses 16 to 28 pound laser quality bond 60 to 90 g m Most textured and colored stock is accepted but discouraged as it will adversely affect color print quality The paper used should not scorch melt transfer material or release hazardous emissions when heated to 200 C 392 F for 0 1 seconds Use only Apple Color LaserWriter 12 600 PS Transparencies A4 or Letter Supports U S letter and A4 in the standard paper cassette The paper cassette holds 250 sheets of 20 pound 75 g m paper The multipur pose tray can hold up to 100 sheets of standard U S letter paper and other paper sizes up to U S legal Optional 250 sheet universal c
138. l user LocalTalk ports turns off EtherTalk remains active In some cases the LocalTalk port turned off after printing a very large number of PostScript test files to a printer using both EtherTalk amp LocalTalk ports even though the EtherTalk port remained active and could be seen from any host Unlikely to affect normal user Specific PostScript Code resets printer Sending the following PostScript code caused the printer to reset itself unlikely to affect normal user Sdisk1 lt lt InitializeAction 1 gt gt setdevparams PowerPoint v3 0 gradients Some PowerPoint slides containing complex gradients or patterns would freeze the printer TraySwitch not saved Enabling the TraySwitch feature on a Color LaserWriter 12 600 J Kanji version did not survive power cycles One byte PostScript filename on printer hard drive Creating a one byte long PostScript filename on a printer s hard disk caused an I O error Unlikely to affect normal user Configuration switch and image data This issue only affects printing from PC computers using the parallel port Once the printer s configuration switch was used 96 11 13 15 58 Color LaserWriter 12 660 PS 3 7 Networking bugs fixes in ROM v1 2 the default protocol for the parallel port TBCP was changed to Normal and not returned back to TBCP regardless of config uration switch position In this scenario text documents would print but documents with image
139. leaning belt Drive Solenoid io L6 4 24V l J2014 2 L to turn ON SL6 operating the attraction roller press 1 ATTSLON cam SL6 is used to control the pressing separation between the attraction roller and the transfer drum Attraction Roller Press Solenoid ie NX 24V Drum Press J2014 4 1 L to turn ON SL7 operating the transfer drum press Solenoid ______ 3 DDSLON cam SL7 is used to control the pressing separation between the photosensitive drum and the transfer drum ie im Transfer Drum J2014 5 st24V Cleaner Press 4 5 L to turn ON SL8 operating the cleaning brush press TDCSLON cam SL8 is used to control the pressing separation Solenoid between the cleaning brush and the transfer drum SLO 24V Discharge Roller J2014 10 L to turn ON SL9 operating the discharge roller press Press Solenoid C 9 DCSLON cam SL9 is used to control the pressing separation between the discharge roller and the transfer drum 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Transfer Drum DC Controller Board Mechanical Controller Board PS6 J105 J112 J2007 Attraction yg 3 20 12 ATTSNS H when print paper is rolled Sensor over the transfer drum eee PS8 L switched to H when the transfer ransier Drum 11 19 13 drum reaches the registration position TOPRE Top Sensor a 2 H switched to L when the transfer PS7 drum reaches the TOP position Separation VL
140. lies but are available as part of the paper pickup block kit P N 076 0500 Pivot Mount Spring Behind Plate 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Cassette Pickup Assembly Perform the Paper Pickup Block Disassembly procedure After split ting the pickup block as described in that procedure the cassette pickup assembly is one of the parts that remains Note that the following pieces are not contained in the cassette pickup assembly e Pickup motor cover P N 922 1323 e Paper pickup block kit P N 076 0500 which contains the door closing spring grounding spring pivot mount and pivot mount spring and screw 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart 3 35 First Multipurpose Pickup Assembly page 1 of 2 Remove and disassemble the paper pickup block After splitting the pickup block as described in the Paper Pickup Block Disassembly topic the only task remaining is the removal of the pickup assembly cover This cover is not a part of the multipurpose pickup assembly but is available separately as P N 922 1324 Itis held in place by two C shaped claws that grip the metal shaft beneath the cover 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Multipurpose Pickup Assembly page 2 of 2 Now With a flat blade screwdriver pry the claws free of the shaft and remove the cover from the multipurpose pickup assembly Pickup Assembly Cover C Shaped Claw
141. lor LaserWriter 12 600 PS Take Apart Toner Carousel Assembly page 3 of 5 2 Remove the three silver colored self tapping screws and remove the rear carousel bushing from the chassis You may have to shift the carousel slightly for the bushing to clear the printer drive assembly Tip Pointing Upward r Rocker Pin Rear Carousel Nipple Pointing Outward Bushing Replacement Note If the rocker pin comes loose from the bushing make sure to reinstall it with the tip high and pointing upward and the nipple low and pointing outward 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Carousel Assembly page 4 of 5 3 Remove the three brass colored screws and remove the front carousel bushing If necessary unclamp the cable to free the bushing Front Carousel L p Bushing Replacement Note This bushing is keyed Set it in position in the chassis and manually rotate the carousel s central rotary mechanism until the bushing seats solidly in place The front and rear carousel bushings secure the central rotary to the chassis so that the rotary does not rotate with the carousel 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Carousel Assembly page 5 of 5 4 Slide the carousel assembly out the left side of the printer Caution Take care not to damage the carousel flags during this proce dure A broken flag will result in a toner carousel error and prevent the printer from
142. low 4 There is a repetitive horizontal defect on my pages Refer to Roller Diameters in this chapter Defects that repeat at a constant spacing are usually the result of dirty or damaged rollers 5 Iam getting oil spots on the paper What can I do to prevent this The purpose of silicone oil is to prevent offsetting of toner onto the fuser rollers Oil spots on paper should occur infrequently and then usually on the back of the page Some factors that are known to increase the incidence of oil staining are e Failure to remove the orange spacers from inside the fuser access door Turning the printer on and off repeatedly over a short period of time e g five times in an hour e A printer coming out of a very long standby mode may exhibit some staining on the first couple of pages e Using recycled paper over a prolonged period can plug the oil pan filter which in turn can cause long streaks on the back of the paper 6 Iam getting small amounts of toner on the printed page What can I do to prevent it Cleaning the toner off the following areas should eliminate the problem e Clean the density sensor and separation discharge wire with the brush provided as described on page 223 of the user guide Clean the paper pickup area as described on page 226 of the user guide e Print ten blank pages This will help clean toner off rollers 7 What does the Best print quality selection do for the printer Selecting th
143. ltage E IHV1DC1 g Conversioni Detection i 8 1 lt Circuit Circuit i 5 g 5 5 i 5 8 i O gt 2 Switching E HVFre1 7 Circuit i E gt 7 i g g HVFre2 _ r I i i a 1 Constant Current fo 1 i I S 7 Gontroller Circuit Sign Train ication AC Voltage 5 i m NE 1 Sori mplification g Q i Circuit Circuit Generation P i a Generation Circuit i gt Sn Current j Detection f j Circuit i HV1AC1 Voltage Voltage ON OFF Selection Circuit Circuit HV1ACO I HVFre 1 2 are signals of pulses 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Developing Bias When the print sequence starts the primary charging voltage AC DC is applied and the toner cartridge is pressed against the photosensitive drum to rotate the developing cylinder Then the high voltage control IC IC1003 on the high voltage power supply board sets the devel oping bias DC drive signal DEVDC to L and applies the developing DC bias to the developing cylinder through the developing bias contact behind the mechanical controller board After the specified period of time has elapsed the developing bias AC drive signal DEVAVE goes L and the voltage superimposing developing AC bias onto devel oping DC bias is applied to the developing cylinder The developing bias is applied only when the toner cartridge is pressed against the photosensitive dr
144. luminate briefly This confirms that power is getting to the status panel and that all LEDs are operational The lights then extinguish and the four primary lights come back on This marks the start of the Power On Self Test POST POST is a set of diagnostic procedures that are written into firmware on the I O controller board POST occurs during normal printer startup POST checks the following four areas of the printer Stage 1 I O controller CPU amp SIMMs Stage 2 I O controller miscellaneous Stage 3 Printer engine Stage 4 Optional hardware POST extinguishes the primary lights left to right as each test stage passes In a functional printer the testing process takes about 40 seconds after which the normal warmup continues However if POST detects a fault during any stage the status panel enters an error state and flashes the Paper Out and Paper Jam lights forever At this point no further printer operation is possible until the fault is resolved LJ LI Ge Ge POST Detected Error Note The QuickTime movie to the left shows the behavior of the status panel when a POST error is encountered during startup The POST Codes Matrix follows later in this topic Observation of the primary lights prior to an error array can be an effec tive I O controller confidence test If the Ready and Consumable lights extinguish during POST stages 1 and 2 have passed signifying that the VO controller is functional Which How Many
145. ly P N 661 0906 PS8 Transfer drum top sensor Sensor Actuator Part of the transfer drum assembly P N 661 0906 PS9 Paper delivery sensor Sensor Actuator Part of the fuser assembly P Ns 661 0900 661 0901 PS10 Oil overflow sensor Sensor P N 922 1353 Actuator Part of the fuser assembly P Ns 661 0900 661 0901 PS302 Paper registration sensor Sensor Part of the cassette pickup assembly board P N 922 1311 Actuator Part of the cassette pickup assembly P N 661 0907 PS352 Sheet feeder pickup sensor Sensor Actuator Part of the front sheet feeder pickup assembly P N 922 1358 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Descriptions The table below describes the other sensors used in the Color Laser 2 of 2 Writer 12 600 PS Designation Name Function Availability Photo reflector PS301 Cassette paper present sensor Part of the cassette pickup assembly board P N 922 1311 PS303 Paper leading edge sensor Part of the cassette pickup assembly board P N 922 1311 PS351 Cassette paper present sensor Part of the front sheet feeder pickup sheet feeder assembly P N 922 1358 Photosensor PS11 Toner sensor Emitter P N 922 1558 Receiver P N 922 1559 PS12 Waste toner sensor Emitter Receiver Part of the disposal box cover assembly P N 922 1342 PS13 Oil low sensor Emitter Receiver Part of the oil assembly sensor P N 922 1407 Actuator Floating ball within
146. m Motor CPU toV Driver Q2002 24 VC COMA J201 2 Drum Motor TOPREG Transfer Drum Top Sensor Upon receiving the print sequence command the CPU Q2001 in the mechanical controller sends the drum motor control signals DRMPHA DRMPHA DRMPHB and DRMPHB and the drum motor rotation rate select signal DRMICH to the drum motor driver Q2002 0 2 second after the main motor starts The Q2002 sends the drive signal to the drum motor based on these signals 24 VC power supply is used to drive the drum motor In order to slow down the paper feed speed through the fuser assembly in the transparency mode the CPU sets the DRMICH signal to H to drive the drum motor at a low speed If the transfer drum top sensor signal TOPREG remains unchanged for six seconds or more 12 seconds in the transparency mode the CPU recognizes it as a drum motor error 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Cleaning The cleaning brush motor is a DC brushless motor Controlled by the Brush Motor CPU on the mechanical controller it is used to drive the cleaning brush Drive Circuit Mechanical Controller Board CPU Q2001 24VA J2014 8 TDCLON 7 33 Cleaning Brush Motor Upon power on door open close or cleaning of the density detection pattern after image quality stability control or after the paper is sepa rated following every 100 prints the CPU se
147. m projects through a cutout in the cassette elevator plate and is no longer reflected back to PS301 After actuating the lever for the registration paper sensor PS302 the paper reaches the registration roller Since the registration roller is not rotating at this time the paper stops its leading edge is curled and its skew is corrected Example The paper actuates the lever for PS302 and reaches the registration roller in frame 19 of the animation When a certain time period elapses after the paper has passed through PS302 the registration roller clutch CL3 is turned on to resume feeding the paper When the paper reaches the paper leading edge sensor PS303 the pickup motor and paper stop Example Up through frame 38 the light emitted by PS303 reflects off a prism and returns to PS303 The leading edge of the paper breaks this beam in frame 39 The DC controller and the mechanical controller detect the registration position on the transfer drum by the transfer drum top sensor PS8 This timing is used as reference to execute the print sequence The mechanical controller starts driving the pickup motor at a certain time period after detecting the registration position of the transfer drum Thus the paper resumes feeding so that its leading edge will synchro nize with the gripper on the transfer drum and also match the image leading edge on the photosensitive drum 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp
148. m PS11 aligns with a window in the bottom of the cartridge In a totally empty cartridge the light beam would shoot through this window out a second window in the top of the cartridge and strike the receiving diode of PS11 In a normal cartridge the controller judges level of toner by measuring the duration that light strikes the receiving diode after the stirring plate has swept in front of the bottom window If the duration is longer than a prescribed value the DC controller determines that the toner is low and notifies the I O controller aa Toner Sensor PS11 Receiver Di C4 Toner Sensor PS11 Emitter Normal Toner Low Example See the cyan cartridge in frame 116 of the animation This is the position that a cartridge is in when toner level is detected This position is called the press position It is the only position in which the inner workings of the toner cartridge are mechanically driven The cartridge is in the stop position in frame 115 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Stages of Imaging The print process is roughly divided into the six stages shown below Electrostatic Latent Image Formation Photosensitive 1 Primary Charging Drum Cleaning 2 Scanner Exposure E 4 Drum Cleaning i E 3 Developing S Developing Transfer Drum Cleaning Discharge 9 Cleaning 10 Discharge 6 Attraction Registration
149. m the printer Screw Strap Upper Hinge Plate Lower Hinge Plate 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Front Door Latch Adjustment First Open the pickup block door After prolonged use or directly following shipment of the printer the front door latch may get out of alignment just enough to prevent tight closure If this has occurred perform the following procedure Now Locate the positioning screws on the front door latch With one hand press the front door shut fully slightly loosen and shift the two screws against the door catch and then tighten the screws Latch Positioning Screws 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Top Cover page 1 of 5 First No first steps are required Now 1 Open the front door Open the fuser access cover and remove the two brass colored screws that secure the top cover to the printer chassis 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Top Cover page 2 of 5 2 Open the top access door release the small tab by gently pulling it upward and slide the black arm off its pin Top Access Door Tab Pin 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart 3 51 Top Cover page 3 of 5 Important There are three hidden claws at the left end of the top cover In the step on the next page you will unseat these claws raise the left end of the top cover and remove the cover from the printer Do not attempt to
150. mbly The paper size data is supplied to the CPU by the cassette size sensing switch for cassette paper feed or by the paper size specification command issued by the I O controller for manual paper feed Notes 1 The shaded area permits writing with the laser beam 2 Times T1 and T2 vary depending on the paper size 3 Ifno paper size is specified by the paper size specification command from the I O controller for manual feed the printer does not recog nize the paper width So the T1 and T2 values are assumed to be legal size the maximum paper width for the printer The CPU deter mines the actual paper size from the paper length detected by the paper leading edge sensor PS303 when the leading edge of the paper has passed through PS303 Subsequently the image is masked based on the detected paper size LSYNG Un Left Right Margin T2 Masking Signal Ti l EET Top Bottom Margin Masking Signal TOP i A gt E u jE ee tis ine shy EESE O A fee m He SEAN io a t E 1 1 Sie 2mm 2mm 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Outline Scanner System The scanning mirror is a critical part in the scanner unit It is mounted on the scanner motor shaft and rotates with the scanner motor The rotation of the scanner motor is controlled by the scanner driver so that the laser beam reflected by the scanning mirror scans across the photo sensitive drum at a constant sp
151. mechanical controller reverses the toner carousel motor This motor drives the operation of the cartridge press cam so that the pressure on the press actuator is released and the toner cartridge separates from the photosen sitive drum When the press cam is about to turn the controller sets the developing rotary brake signal DEVBRK to H and turns the toner carousel brake clutch CL1 off When the toner cartridge position sensor PS3 detects the cartridge has begun to leave the drum the controller sets DEVBRK to L and CL to on again and stops the toner carousel motor 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Carousel Motor Drive Circuit The toner carousel motor M3 is a two phase stepping motor The toner carousel motor is controlled by the toner carousel motor driver Q2003 on the mechanical controller This motor transmits the driving force to the toner carousel and the toner cartridge press cam When the print sequence command is received the CPU Q2001 in the mechanical controller sends the toner carousel motor control signals DEVPHA DEVPHA DEVPHB DEVPHB and the toner carousel motor rotation rate select signal DEVICH to the drum motor driver Q2003 0 2 second after the main motor starts Based on those signals Q2003 supplies the drive signal to the toner carousel motor 24 VC is supplied for the drive power supply When none of the toner cartridges has been installed exc
152. more infor mation 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Mechanical drive is delivered to the toner carousel in three phases the rotation of the toner carousel itself the press and separation of the toner cartridge and the rotation of the developing cylinder This sequencing is accomplished by varying the rotational direction of the toner carousel motor and the switching of the toner carousel drive clutch CL2 The three phases are delivered from three separate points on the printer drive assembly Mechanical Controller Board A cS 5 oe 52 a Sx Bot a Loa oO Om o gt N gt a W c dW o O fe SO D a gt ko gy 3 Sm co A gt 6S SD o 2 Go p 39 3 g 2a x oo w S Fo oO m Photosensitive Developing Rotary Drive Signal DEVON Developing Motor Drive Signal 1 of 8 Toner Carousel Carousel Position Detection Flag Cartridge Position Detection Flag Toner Carousel Toner Carousel Motor Clutch CL2 Carousel Rotation Normal On Toner Cartridge Press Separation Reverse Off Developing Cylinder Rotation Normal Off 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Toner Cartridge Installation Pins The front face of the toner cartridge has three triangular projections on 1 2 3 which positioning pins are mounted Pins 1 and 3 on the sides mate into the hard plastic of the carousel Pi
153. n 2 on the top mates into a white nylon bushing These pins help fix the cartridge housing to the carousel in a rotational axis while still allowing for the slight lateral press that occurs during development The slot for pin 2 is spring loaded and also assists in cartridge separation after development Slot Pin2 Toner Carousel Slot Slot Pin 3 Pin 1 Toner Cartridge Pins There are three toner color identification pins projecting from the 4 5 6 carousel end panel The arrangement of pins is unique for each bay These pins mate into three slots on the rear face of the cartridge A fourth slot on each cartridge is plugged to prevent the cartridge from being installed into an incorrect bay Co Ne Whe ple Magenta Cyan Yellow Black Plug Position Key Pins 4 5 amp 6 Slots for Pins 4 5 amp 6 Pin and plug positions are unique for each color This example shows the cyan bay and cartridge 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Pin 9 The 3 8 95 mm wide pin 7 at the center point of the cartridge mates into a slot in a spring loaded bushing in the carousel end panel This pin functions similarly to pin 2 Pin 8 is the flex type pin on the rear face of the cartridge It mates into a slot in the same bushing as pin 7 described above but its function is entirely different A ramped opening into the slot actuates pin 8 and unlocks the toner cartridge so that its inner workings rotate indepen
154. n coordination with the photosensi tive drum 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Outline Toner Stirring Function Toner Cartridge The toner cartridge includes a toner container with stirring plate a toner feed roller rubber blade and developing cylinder The developing cylinder toner feed roller and stirring plate receive rotational drive through the white toner cartridge drive gear on the photoconductor drive shaft Toner carousel motor M3 supplies this drive in syne with the drive supplied to the photosensitive drum by drum motor M4 This internal drive train of the toner cartridge engages with the toner cartridge drive gear only during the press position Note See Toner Carousel Control later in this chapter for full stop 99 66 99 66 description of home press and fetch positions Toner Container Blade Developing Cylinder Toner Feed Stirring Plate Roller The toner cartridge stirring mechanism consists of the stirring plate and toner feed roller and helps in supplying toner from the toner container to the developing cylinder The stirring plate agitates the toner within the container The feed roller is responsible for applying a thin layer of toner onto the developing cylinder 95 08 23 11 29 Color LaserWriter 12 600 PS Basics am
155. nd the contact surface of the cleaning belt moves to clean the upper fuser roller In normal operation the cleaning belt moves by one step each time the cleaning belt drive solenoid SL3 is actuated In the transparency mode it moves by two steps The cleaning belt has a notch about 12 30 cm from its trailing edge When this notch is detected by the cleaning belt sensor PS5 the cleaning belt sensor signal WEBSNS goes H and the DC controller notifies the I O controller that the cleaning belt is near its end of life The DC controller will notify the I O controller and stop the printer after about 500 more prints At that point you must replace the fuser assembly Cleaning Belt Drive Solenoid SL3 Cleaning Belt Winding Roller Cleaning Belt Sensor Lever Cleaning Belt Cleaning Belt Roller 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Main Motor Drive Circuit Outline The main motor is a DC brushless motor controlled by the CPU on the mechanical controller and used to drive the loads peripheral to the transfer drum and the fuser delivery unit Those loads include e Fuser Assembly Upper and lower fuser rollers Face down delivery roller Fuser delivery roller Oil applying roller Oil pump e Transfer Drum Peripherals Attraction roller press cam Transfer drum press cam Cleaning brush press cam Discharge roller press cam e Waste toner screw inside the photoconductor cartridge
156. ng Brush Separated Cleaning Brush Pressed Transfer Cleaning Brush Press Cam Cleaning Brush 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Discharge Roller The discharge roller is normally pushed up by the discharge roller press cam so that it is separated from the transfer roller After the paper is separated from the transfer drum the discharge roller press solenoid SL9 is turned on to release the cam and thus press the discharge roller against the transfer drum After the discharge SL9 is turned off to actuate the cam to push the discharge roller up and then separate it from the transfer drum The discharge roller is not driven by any motor but rotates along with the transfer drum The discharge voltage corresponding to one cycle of the transfer drum is applied to the discharge roller to neutralize the elec tric charge remaining on the transfer drum surface Discharge Roller Q A DD Ay K YO ue og 500 Transfer Drum Discharge Roller Press Cam Discharge Roller Pressed Discharge Roller Separated Discharge Roller Press Cam Transfer Drum Discharge Roller 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Drum Motor The drum motor is a two phase stepping motor controlled by the drum Drive Circuit motor driver Q2002 on the mechanical controller It drives the photo sensitive drum and the transfer drum Mechanical Controller Board Dru
157. ng brush The scanner motor is a three phase eight pole DC brushless motor with a built in hall element The scanner motor rotates a six sided mirror that in turn scans the laser beam which has been emitted from the laser diode in the horizontal scanning direction 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Outline Basic Sequence of Operation The following table describes the five periods of printer operation Period amp Duration Purpose Remarks WAIT Wait To warm up the fuser During this period the From power on untilthe roller to put the printer checks for fuser roller tempera printer inthe standby jammed paper and for ture reaches the target state availability of all the value This period fin toner cartridges It ishes in about three also performs image minutes at normal room stabilization and other temperature tasks STBY Standby To hold the fuser If the printer stays in From the end of the roller at the target the standby state for WAIT period until the value to keep the 30 minutes or more it PRINT signal is input printer ready to print drives the main motor from the I O controller for 0 5 second to From the end of the rotate the fuser roller LSTR period until the so that the fuser roller PRNT signal is input will not be deformed from the I O controller or the power switch is turned off INTR Initial Rotations To stabilize the When the scanner After
158. nical Controller Mount and Board page 1 of 3 Remove the top cover left cover rear cover and rear shield plate For better clearance you can also remove the main fan Note Perform this procedure only if you need to get to a part deeper in the printer If you simply want to replace the mechanical controller board see the Mechanical Controller Board topic Remove all the connectors going into the mechanical controller board Replacement Note J2018 J2020 and J2021 are empty 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Mechanical Controller Mount and Board page 2 of 3 2 Remove the two silver colored screws at the left and right side of the board and the one brass colored screw below the board Remove the cables from the cable guide at the top of the board Disconnect the large connector going into J1004 on the high voltage power supply 1 Cable Guide 2 3 Cable to J1004 Replacement Note Make sure that you install the three screws tightly in their correct locations 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Mechanical Controller Mount and Board page 3 of 3 3 Using a flat blade screwdriver press upward on the claw that hooks into the chassis below connector J2017 Lift the mount slightly to free the tab at the upper right and remove the mount and board from the printer using an outward rolling motion 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Fir
159. ning belt sensor PS5 is tripped At that point the DC controller allows 500 more prints to occur before stopping printer operation at which time you must replace the fuser assembly The fuser oil light comes on when the oil low sensor PS13 is tripped by the floating ball within the oil reservoir At that point the DC controller allows 50 more prints to occur before stopping printer operation at which time you must replace the fuser oil bottle Is the fuser assembly light or the fuser oil light illuminating 8 lol The toner cartridge and photoconductor lights will illuminate when end of life is sensed see page 1 46 for information on toner level sensing and page 1 68 for photoconductor sensing The printer does not shut down when end of life is sensed for these consumables 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Flowchart E The printer came ready but did not print the startup page s The startup page and or the demo page might be disabled through the Apple Printer Utility under the Printer Preferences heading Enable the startup page and restart the printer y Does the printer deliver the startup page Go to E on Flowchart C Go to on Flowchart A 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Flowchart F YES The printer comes ready and prints the st
160. ns all the information that developers receive Chapter 1 discusses some of the broader issues of the printer such as pinouts connectors extended memory and the like 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Video Interface V O Interface The I O interface signals are as illustrated below Signals O Controller Board IOl zlz z ziz z SlSlFlS S BlS G GB Alsi ale O12 S S S S S S S S S 2 vi a wawo 3a 5 00000 000l giaa z 9 9 9 3 lt 3 A SJN S A Ao Ns oy lt 215 DC Controller Board Description of When power is turned on the printer enters the wait state Operation At the end of the wait state the DC controller sends the ready signal RDY to the I O controller to verify that the printer is ready to print When the RDY signal goes L and the data for printing one page is available the I O controller sends the print signal PRNT to the DC controller Upon receiving the PRNT signal the DC controller issues the print sequence command to the mechanical controller and starts the initial rotations INTR sequence At the end of the INTR sequence the DC controller sends the vertical sync signal TOP to the I O controller within the specified time The I O controller sends the video signals VDO7 0 which synchro nize with the horizontal sync signal LSYNC and the TOP signal sent by the DC controller to the DC
161. nt DC controller or mechanical controller boards are the intelligence centers of the printer POST errors in some cases can be caused by a fault in one of these boards Keep these boards in mind as you isolate faults In addition always check the ribbon cable between J2007 on the mechanical controller board and J112 on the DC controller board Poor connection at either of these two points can cause unpredictable behavior On site first make sure that the controller and interconnect boards are firmly installed and that the connectors are secure especially the cable between J802 on the interconnect board and J108 on the DC controller board Tighten the two screws on the I O bracket If the problem persists replace the I O controller board Note In rare instances a faulty I O interconnect board could also return this error Make sure that the SIMMs are securely installed in the correct sockets and match one of the supported configurations listed on page 146 of the User Guide If the problem persists replace the SIMM This error indicates that POST detects that the hard drive is present but failing Make sure that the cable is firmly connected If the problem persists replace the hard drive The DC controller has detected an error in the fuser heater bulb circuit Over the phone ask if the customer has just replaced the fuser If yes then confirm that the correct voltage fuser was installed and that the two captive screws were fully tig
162. ntroller Board Controller Gircuit Controller Board o fe a z gt o S a gt gt a E4 gt gt gt gt K gt gt gt t FA l 7 gq S ay AY JA F t Laser Scanner Solenoids Pickup High Voltage Sheet Drive Motor Sensors Clutches F8 S Board Power Supply Motors Feeder 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory When the front door the fuser access cover and the pickup cover are closed the door switch SW2 is automatically turned on and the power supply is sent to the driving loads This circuit also supplies 24 VDC and 5 VDC which are required for the printer itself The 24 VDC is supplied for the motors the exhaust fans the clutches and other driving components as well as for the cassette pickup board and the high voltage power supply board The 12V power is generated in the DC controller to drive the laser diode The 24 VDC consists of e Normal 24 VA which is shut off when SW2 is turned off by the opening of the front door fuser access cover or the pickup cover e Voltage of 24 VB which is always on whether SW2 is turned on or off e Voltage of 24 VC which is shut off in the power saving mode see below or when the cover is opened is generated in the mechanical controller board The 5 V power supplied to the I O controller is monitored using the 5 VB signal to ensure it is always supplied The printer enters the energy saving mode on command from the I O
163. oller Rotates by Friction Paper DC bias is applied to the attraction roller The value of the DC bias varies in line with the temperature humidity sensing system Example The attraction roller presses in frame 59 of the animation and separates in frame 89 after the trailing edge of the paper passes 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 7 Toner Transfer The paper attracted to the transfer drum is transported in correspon dence with the rotation of the transfer drum At this time positive charges are applied to the reverse side of the transfer sheet to transfer the toner from the photosensitive drum to the paper This process repeats sequentially for each color M C Y K Toner Gripper Photosensitive Drum Pe usec Transfer Sheet Elastic Sponge Layer Aluminum Layer Transfer Drum Paper Z DC bias The transfer drum consists of an internal aluminum cylinder covered successively by a conductive elastic sponge layer and an external insu lating transfer sheet DC bias is applied to the transfer drum The value of the DC bias varies in line with the temperature humidity sensing system In full color mode as the transfer steps proceed with the first color second color and so on the transfer force weakens due to the increase in the number of negatively charged toner particles on the paper To counteract this effect the transfer bias is gradually increased for the second and
164. oller Board IC1003 one _ HV1DCO SENSEO Primary Charging vinci High SENSE1 Roller Voltage 7HV1ACO Voltage Generation lt ___ Control Circuit ph ACA IC CPU The photosensitive drum and the transfer drum are separated when the photosensitive drum thickness detection is performed the overhead transparency mode is activated or the photoconductor cartridge is being replaced When the mechanical controller sets the drum press signal DDSLON to L the drum press solenoid SL7 is turned on and drum separation cam activates to move the transfer drum away from the photosensitive drum 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Transfer Drum Transfer Drum Shaft Separation Cam 2 a Roller Separation Cam 1 When you lower the transfer drum lever drum separation cam 2 moves the transfer drum away from the photosensitive drum in a manner iden tical to the solenoid controlled operation described above Transfer Drum Separation Cam 2 Roller Transfer Drum Lever 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fetch Stop Press Toner Carousel Control Outline The toner carousel consists of four cylindrical bays clustered around a central press assembly Each bay is occupied by a single cartridge When you load a cartridge into the printer that color is said to be ina fetch position As the cartridg
165. on flag even though the toner carousel motor rotates e PS4 detects an error in the width of the rotational position flag e PS4 detects a flag width differing from that of the specified rota tional position flag e PS4 does not detect the rotational position flag when the press oper ation starts When the following phenomena are detected by the toner cartridge position sensor PS3 the DC controller is notified by the mechanical controller and judges them as toner cartridge press separation failures The DC controller notifies the I O controller of the faults and stops the printer e PS3 stays on for a certain period of time after press starts e PS3 stays off for a certain period of time after separation starts 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Toner The carousel stops when the next toner cartridge is facing the photosen Cartridge sitive drum Stop Photosensitive Drum APy 7 _ _ When the mechanical controller detects that the carousel has rotated to a stop position the controller turns off the toner carousel motor The DEVBRK signal is set to L CL1 is turned on to apply a brake and the DEVON signal is set to H to turn CL2 off 1 Cartridge Press Drive Gear Behind Chassis Wall Shaft Cartridge Press Cam 1 of 4 Cartridge Press Actuator 1 of 2 AUN 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Toner The toner cartridge
166. oner disposal box from the printer Remove the black plastic cap in the side of the disposal box and use it to seal the box Toner Disposal Box Important There is a small safety that drops when you remove the disposal box Lift this safety before closing the disposal box cover Do not force the cover shut when the box is absent 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart First Photoconductor Cartridge page 1 of 2 Remove the toner disposal box and toner cartridges WARNING When you install a new photoconductor the DC controller board automatically zeros the parameter that tracks photo conductor life Pulling out a new cartridge and reinstalling the old one may result in an old cartridge being treated as new If you are consid ering swapping photoconductors to isolate a problem you must first capture the controller board parameters For more information see Diagnostic Utility in Chapter 2 The photoconductor is light sensitive and subject to damage if special care is not taken during removal You must use the protective orange photoconductor tray when removing the cartridge from the printer The photoconductor cartridge is available only through the Photocon ductor Replacement Kit Finished Goods P N M3761G A The protective tray and two toner disposal boxes are included in this kit The tray is also available separately as P N 922 1580 The
167. onitoring the number of passing flags see Carousel Rotational Position Detection below 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Carousel The rotational position of the toner carousel is detected by the toner Rotational carousel position sensor PS4 by monitoring the number of passing Position rotational position flags The eight rotational position flags include the Detection home position flag which also serves as magenta cartridge fetch posi tion flag and the fetch and stop position flags for each of three other colors The home fetch and stop flags are of different widths When PS4 detects a flag the developing rotary position sensor signal DEVHP is set to H The CPU on the mechanical controller recog nizes which flag the home position flag stop position flag or fetch position flag is being detected based on the time during which the DEVHP signal is set to H Carousel Position Sensor Yellow Stop Black Fetch S A Cyan Stop Magenta Fetch and Home Position Black Stop Q i Cyan Fetch Magenta Stop Yellow Fetch Note This illustration is diagrammatic and doesn t show the flags and the sensor in their actual locations In this example the yellow cartridge is in the stop position opposite the photosensitive drum L1 L3 L5 L3 L5 L3 L5 L3 L5 j I c ail c i al etae p Cn CE T T L l l Home Black Cyan Magent
168. operating For more information see Chapter 1 Flag 3 Flag 4 Flag 5 Inner Bushing Flag 6 Flag 7 Replacement Note Make sure that the circular guide on the inner bushing slides into the slotted cutout in the chassis The carousel will not fit into the printer otherwise See in place photo under step 2 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Removal page 1 of 2 First No first steps are required Note The Color LaserWriter 12 600 PS is very heavy and requires two people to lift it The right side of the printer is heavier than the left Now 1 Unplug the sheet feeder power cord from the printer Printer a Power Cord Sheet Feeder 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Removal page 2 of 2 2 Remove the two cotter pins that secure the printer to the feeder Grip the two hand recesses on each side of the printer and remove the printer from the sheet feeder Cotter Pin 1 Cotter Pin 2 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Front Cover First Remove the paper cassette Now Open the side access cover Remove the three brass colored screws Lift the front cover up to release the three hidden claws along the outside edge of the feeder and remove the cover from the feeder Front Cover Side Access Cover 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Sheet Feeder Rear Cover
169. or LaserWriter 12 600 PS Basics amp Theory V Pickup Feed System QOUtING s Sites He ee i a a iea 1 89 Paper PICKUP sictest ic ets ide athe ten Ge ae lence abies 1 90 Overhead Transparency Detection cceccceeseeseeeeeeeeeeeeeeeseeeeeaeessaeeeeeenaees 1 96 Cassette Pickup Board cceesceeseeeeseeeeeeteseeseeeteaeeseaeeeaeessaeesaeessaeeseeeeaeeeaees 1 97 Transfer Drum and Peripherals cceeeseceeeseeeeeeneeeeeneeeeeeeeeeeeneeesenneeeeeeeees 1 100 Gripper CONTO a a ce hes a a lieth eit etiets attatiadiseedbaltedassstinsiedlec AAE 1 102 Attraction Roller cc A toc etki bee ed ieee deviled ape ees 1 103 Eor lee a EEEE A saseeccadeacdessisediagaversraiczsusasicbisaiteasasediapasa 1 105 Transfer Drum Cleaning Assembly cecceeeceesceeeeeeeeeeeeneeseeeeeeeteaeeeeeeea 1 106 Discharge ROET d siigh aeaa aaa e Aaa E E sek tals 1 107 Cleaning Brush Motor Drive Circuit ecceeceeeceeeeeeeeeeeeeeeeeeteaeeseeeeeaeeeea 1 109 Fuser Assembly isi ntinnstie cove aa ee a Ae 1 110 Transparency MOC is 2c kot ranei aray feeders eS 1 112 Fuser Assembly Errors Ssnin a a N A R AEA 1 115 Oil Circulation Systeri 28 c cscs as Aisin iene atin aes 1 122 Fuser Cleaner Assembly cecceeeceeeceeeneeeeeeeneeteaeeeeeeeaeeseeseaeesneeeeeeeaees 1 124 Main Motor Drive Circuit sanepane aie aroari ae o E eaaa ei ie ainan 1 125 Paper Jam Detection nrp iinei ea eae aara a anaE a araa EE pa Tanri 1 126 Pickup Delay Jar sis seccc c
170. otor rotates normally 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Pickup Motor M1 About the Printer Drive Assembly Outline of Drive System The printer has six motors the pickup motor main motor drum motor toner carousel motor cleaning brush motor and scanner motor See Motors Fans Heaters in the Parts chapter for additional information The pickup motor is a two phase stepping motor in the paper pickup block and is controlled by the cassette pickup board The pickup motor provides mechanical drive to the following parts e Cassette pickup roller e Separation roller e Registration roller e Manual feed pickup roller e Manual feed paper lifting cam e Feed rollers 1 and 2 The printer drive assembly houses three separate drive trains for main motor M2 toner carousel motor M3 and drum motor M4 Their delivery points and destinations are as shown Main motor M2 drive train Fuser assembly 2 Paper delivery assembly via the delivery drive assembly 3 Waste toner screw 4 Transfer drum peripherals Toner carousel motor M3 drive train 5 Toner carousel rotation 6 Toner cartridge press via cartridge press drive gear Developing cylinder rotation outer gear Drum motor M4 drive train Photosensitive drum coupling at the center of the gear 9 Transfer drum 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Main Motor M2 Toner
171. out changing paper You can also add a 250 sheet feeder 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory Marking Engine Laser Controller True 600 dpi Specifications Canon HX LBP print engine 3 ppm in color 12 ppm in black cyan magenta or yellow 1 ppm for transparencies e 600x600 dpi with Color PhotoGrade e Enhanced 600 dpi grayscale imaging effective 200 line screen half tone 122 gray levels Semiconductor laser GaAlAs e Wavelength 780 nm e Output power 1 mW The specifications for the I O controller board are as follows e AMD Am29030 30 MHz microprocessor e 8 MB of ROM including 39 Type 1 fonts e 12 MB of RAM 16 MB on CLW 12 660 8 MB soldered 4 MB or 8 MB SIMM expandable to 40 MB total e 128 K parameter SRAM e SCSI interface for internal external hard disk s e LocalTalk interface e High speed parallel interface IEEE P1284 ECP bidirectional e Ethernet interface with three protocols EtherTalk Novell NetWare IPX PSERVER or RPRINTER and TCP IP BSD Ipd e External Ethernet transceivers available for thin coaxial twisted pair 10Base T and thick coaxial IEEE 802 3 AUI e Two position communication configuration switch e All ports protocols simultaneously active e Color rendering acceleration e Data compression decompression system e Adobe PostScript Level 2 version 2014 The Color LaserWriter 12 600 PS is a true 600 dpi printer because every a
172. p Theory Cartridge Presence Detection The printer has cartridge presence and toner level detecting functions Both these functions are served by toner sensor PS11 Cartridge pres ence is sensed when the cartridge is in the stop position When a toner cartridge is in the stop position the LED of toner sensor PS11 emits lights through a light pipe in the toner carousel Each cartridge bay has its own light pipe The light emitted from the light pipe is normally blocked by the cartridge and does not reach the receiving diode of PS11 mounted above the toner carousel Toner Cartridge a If the light does reach the receiving diode the DC controller determines that no cartridge is installed in that bay and notifies the I O controller L Toner Sensor PS11 Receiver Toner Sensor PS11 Emitter Sound Cartridge presence sensing occurs after printer startup or following the actuation of the toner ejection sensor The controller rotates the carousel to each of the four stop positions confirms that a cartridge occupies each bay then continues its startup sequences Click the icon to the left for a sound sampling of the carousel during cartridge presence sensing 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Toner Level Detection Animation When it presses against the photosensitive drum the cartridge shifts just enough so that the light fro
173. p Theory Fuser Assembly Errors In order to prevent the fuser heater from malfunctioning the printer provides the following three error detection functions Full description of these functions are on the following pages Error Type A The CPU monitors the voltage of the fuser temperature detect signal THI If it detects any abnormal value it will notify the I O controller as a fuser heater error and then shut off the power supplied to the heater Error Type B If the fuser temperature rises abnormally and the temperature detected by the thermistor exceeds 217 C the safety circuit will shut off the power supplied to the fuser heater irrespective of the output from the CPU Simultaneously the CPU recognizes it as a power supply error and notifies the I O controller Error Type C If the fuser temperature abnormally increases and the temperature of the thermoswitch exceeds about 230 C the thermoswitch will be turned off to shut off the power supplied to the fuser heater 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fuser Error A DC Controller Detects a Fuser Heater Error If the fuser assembly is abnormally heated or if the fuser assembly does not reach the specified temperature for some reason the DC controller will store a fuser heater error and then shut off the power supplied to the heater The DC controller notifies the I O controller of this fuser heater error The DC controller measures th
174. p cover pickup block and transfer drum assembly Raise the separation discharge assembly For this procedure you will need a short Phillips screwdriver no more than 4 inches 10 cm long Do not touch the sensor with your hands If it gets soiled clean it with a lint free paper or cloth 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Sensor Receiver page 2 of 3 Now 1 Remove the brass colored screw that secures the sensor holder to the chassis ceiling above the carousel Disconnect the connector and remove the sensor and holder from the printer Screw Connector 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Sensor Receiver page 3 of 3 2 Release the four tabs and separate the sensor board from the holder Tabs Sensor Board Toner Sensor Holder Tabs Note The sensor board is P N 922 1559 the toner sensor holder is P N 922 1308 and the cable going into the board is P N 922 1328 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Sensor Assembly page 1 of 2 First Remove the fuser access cover and fuser assembly Now 1 Remove the brass colored screw Oil Sensor Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Sensor Assembly page 2 of 2 2 Raise the top access door and locate the black cable cover on the chassis wall just below where the green brush is mounted Using a small flat blade screwdriver raise the
175. per cabling connect it to either the LocalTalk port on the I O controller board or the IOT connector on the DC controller board see Diagnostic Utility in this chapter for more information Top Cover Removed Separation Discharge Fuser Access Assembly Down Front Door Closed Cover Removed 5 4 yo KA es s5 ee ide onnal TA IOT ari AA x Q Connector AA gt T IN n MA E a 0 d N i 5 6 D i Z J c XN Eo sS H Left Cover Removed 4 Vis Rear Cover and Rear Shield Plate Removed 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Door Switch Front Door Main Motor Carousel Fuser Bulb Solenoids Imaging The printer in validation state is its own best instructional and training aid When you first have an operational printer in this state observe as much as you can paying special attention to the following Before you turn on power open and close the doors and observe how the door switch cam assembly works Only when all three doors are closed will the door switch be pressed With power still turned off open the front door and advance the toner carousel by pressing and turning the green carousel knob Observe how the manual rotary assembly meshes with the carousel when you press the knob and how the toner cartridges remain plumb as you rotate the carousel As you close the door observe how the door presse
176. pickup block into its subassemblies Open the front door and pickup block cover Release the green lock levers at each side of the pickup block and slide the block out Lock Lever 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Removal page 2 of 2 2 Remove the two silver colored screws and metal stoppers and remove the pickup block from the printer Left Stopper and Screw Right Stopper and Screw 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 1 of 11 First Remove the paper pickup block The paper pickup block consists of about a dozen parts the two major ones being the cassette pickup assembly and multipurpose pickup assembly Perform this procedure if you need to break down the pickup block into these two assemblies 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Grounding Spring 2 Multipurpose Pickup Assembly Cassette Pickup Assembly Paper Pickup Block U Door Closing Spring 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Now Paper Pickup Block Disassembly page 3 of 11 Remove the door closing spring and the grounding spring from the paper pickup block Note These two tension springs are not a part of either of the two pickup assemblies but are available as part of the paper pickup block kit P N 076 0500 P Grounding Spring Door Closing Sprin 95 08 23 0
177. printer starts up See Chapter 2 for information on the Power On Self Test POST Toner Lights Access Lights Maintenance Lights Waste Fuser Toner Assembly e Photo conductor Ovo cra as Ready In Use Paper Jam Light Alert Paper Out Light Light Light 95 08 23 11 28 Color LaserWriter 12 600 PS Basics amp Theory siapa Status Panel Lights These are the possible arrays that customers can see during normal printer operation Haii Printer O ADA Description Stops E w A A A A A l A J a J Le a a L a J Le J Le a J a A U Ge Gey Warming Up Processing Printer Ready Low Magenta No Low Cyan No Low Yellow No Low Black No Low Fuser Assembly 500 pages later Low Fuser Oil 50 pages later Photoconductor Warning No No Magenta Cartridge No Cyan Cartridge No Yellow Cartridge No Black Cartridge Toner Disposal Box Full No Fuser Assembly No Fuser Oil G loci No Photoconductor Cartridge UUUUUUUUUUUUUUUU UL UUUUUUUUUUUUUUUU UL Access je Lights Door Open See POST Code Matrix in Chapter 2 Poo ge Yox Access Lights gre 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory 1 13 Panel Layout Density Control Panel The density control panel on the rear of the printer can be used to gene
178. r or other knowledge able person is available for consultation with the service technician Providing a computer that is configured with the appropriate system software and is functioning on the network e Arranging for the storage and disposal of packing materials If everything is prepared the service technician should be able to complete the setup and installation in about 45 minutes The file CLW 12 660 Setup pdf is the first chapter of the Color LaserWriter 12 660 PS Read this chapter for the special considerations required when setting up and installing this printer Click on the icon below to open the file FOF e I _ CLW 12 660 Setup pdf 96 11 13 15 58 Basics and Theory Color LaserWriter 12 600 PS Basics amp Theory Chapter Contents General Information Features dai ciiite atid r Ad Dente tiie 1 5 SPeECIICATIONS s s 5 st eee hates eh ES ee ca ated PL Er a Se ed 1 6 Safety Informator es 5i 5 cedesssseecapdecesyerthonsaceeadhenachcavelsaaee anegiihessesetedeaueensacedeagags 1 10 Laser Safety s accu reno ra eaa nal aad ab nate hile inte 1 10 TOMGH Satety APEE EEA E A A 1 10 OZONE Safety AE EE E E E A aiheiseaphadinel ane 1 10 Status nee AE E A r O A 1 11 OUTING a Sect hs ca antec och Ahh e et ee ee ele cade 1 11 Contigurations i ccchee vaseline eer eed 1 12 Density Control Panel aste seredan tiled ae adh Weert dete ds 1 13 Panel Layout a A 4eit ad et Ae ea a a a A 1 13 Densi
179. r Drive Dignal VDOENB Laser Driver Circuit Current Voltage Conversion Circuit Switching Circuit APCENB APCLW LLCNT Constant gt Current Circuit APCUP _ APC IC 1C103 PDIN PD oe 12V Note The APC IC monitors the voltage levels of the 5 V and 24 V power supplies If both voltage levels exceed the specified value the laser driver board uses 12 V power supply produced from the 24 V power supply 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Laser Intensity Control Initial APC The CPU in the DC controller controls the intensity of the laser beam by using the APCUP signal for rough control and the APCLW signal for fine control The APC IC IC103 adds the APCUP and APCLW signals to produce the laser beam intensity control signal LLCNT which is then output to the laser driver circuit in the laser scanner assembly The CPU performs automatic power control APC of the laser diode and adjusts the LLCNT signal so that the laser diode will emit the laser beam at the constant intensity The APC is composed of initial APC and between pages APC The printer performs the initial APC in the following steps while it is executing the initial rotations 1 When the APC enable signal APCENB goes L the CPU decreases the output values of the laser power control signals APCLW and APCUP to zero After resetting the laser current the CPU rota
180. r bias by setting the transfer voltage drive signal HVTR to L At the same time the print bias and between colors bias for each color are applied by varying the TRPWM signal For full color transfer the high voltage control IC IC1003 on the high voltage power supply board applies the attraction voltage to the attraction roller by setting the attraction voltage drive signal HVATR to L before transference of the first color image Also an appropriate attraction bias is applied by varying the attraction bias value control signal ATRPWM according to the environment detected by the temperature humidity sensing system After the attraction roller contacts the transfer drum for a specified period of time the HVATR signal is set to H and the attraction bias is set to off When the paper is separated the high voltage control IC IC1003 on the high voltage power supply board applies the discharge bias which is Output in response to the combination of the discharge bias AC select signals HVSEACO HVSEAC1 to the discharge roller in order to discharge the transfer drum surface Based on values sensed by the temperature humidity sensing system the discharge bias changes the combination of the HVSEACO and HVSEAC1 signals to switch the discharge bias value HVSEACO HVSEAC1 OFF H H Discharge Bias Low L H Discharge Bias Middle H L Discharge Bias High L L 95 08 23 11 29 Color Lase
181. r is queried for its device id System error at address 0x132460 When printing a complex document to the Color LaserWriter 12 600 PS a page is printed stating printer restarted due to system error at address 0x132460 System error at address 0x33F844 A bug in version 1 0 ROM caused certain complex Adobe Illus trator files to reset the printer and to print a page stating printer restarted due to system error at address 0x33F844 Image stitching problem When an image has a very fine line running across its body and the line does not seem to belong to the image that may be a stitching problem If the same problem occurs when printing to another printer for example a LaserWriter 16 600 PS the 96 11 13 15 58 Color LaserWriter 12 660 PS 3 6 problem is likely in the application and the ROM upgrade will not help If possible try printing the problem file to a printer with version 2 0 ROMs If there is no improvement then the problem is elsewhere NetWare port number not set properly When setting the NetWare port number through the Apple Printer Utility the number did not stick Changing AppleTalk type fails Changing the AppleTalk type on version 1 0 ROMs fails when PAPTest is run through a LocalTalk port Unlikely to affect normal user EtherTalkZone and LocalTalkType strings EtherTalkZone strings and LocalTalkType strings did not take input longer than 31 characters Unlikely to affect norma
182. r two adjustments each step in the gauge is equal to 017 inch 425 mm Press the ENTER button to engage the setting Note If you want to quickly return the printer to its factory defaults press and hold both the plus and minus buttons for at least five seconds 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory ll Basic Operation Color LaserWriter 12 600 PS Basics amp Theory 1 19 Animation Paper Path Animation The icon to the left appears at key points throughout this manual Clicking it launches a QuickTime animation called CLW Paper Path This animation shows one complete print cycle through the Color LaserWriter 12 600 PS starting at the point where the final sheet of paper is picked up from the cassette and ending with the delivery of the paper at the top of the printer zm CLW Paper Path N Se T A gt Frame Number Play Step Back 4 Step Forward The animation is very detailed and moves very quickly By using the Step Back and Step Forward buttons at the bottom right of the frame you can step frame by frame through the animation Whenever applicable specific frame numbers that best illustrate a given topic are called out 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Functions Printer functions can be divided into four systems the overall control system the image format
183. rWriter 12 600 PS Basics amp Theory Voltage to Separation AC voltage is applied to the separation discharge assembly Separation to aid in paper separation when a low temperature and low humidity Discharge environment is detected by the temperature humidity sensing system Assembly Separation DC voltage usually is applied to the upper fuser roller and the separation discharge assembly in print period The high voltage control IC IC1003 on the high voltage power supply board sets the separation DC voltage drive signal HVSEP to L and generates the voltage in the separation DC voltage generation circuit on the high voltage power supply board The separation DC voltage is input once to the high voltage separation board and applied to the upper fuser roller and the separation discharge assembly On the other hand when the separation AC voltage drive signal HVSEPAC input from the mechanical controller goes L the separation AC voltage generation circuit in the high voltage separation board gener ates the separation AC voltage and applies it to the separation discharge assembly upon superimposing it onto the separation DC voltage Note The separation discharge assembly can be forced on or off manually by means of the density control panel See Separation Voltage Designation earlier in this chapter High Voltage Power Supply Board
184. raise the fuser end of the cover first you will damage these claws if you do Claw Locator 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Movie Top Cover page 4 of 5 Reach across the top cover and hold your left thumb on the upper front door hinge plate and your right thumb on the I O controller bracket screw Pull firmly against the edge of the top cover to release the three claws and lift the cover from the printer Replacement Note Apply even pressure along the left edge of the cover and make sure that the three claws are securely seated 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Top Cover page 5 of 5 Note The four frames below are from the movie on the previous page and are for the benefit of those who have printed out this topic 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart About Inner Panels General The dark gray face of the front chassis wall is actually composed of four separate interlocking panels Take apart procedures for each follows this topic The diagram below identifies each of the four Toner Carousel Guide Panel Inner Panel 1 Transfer Drum Panel Inner Panel 2 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Inner Panel 1 First Remove the top cover Note Inner panel 1 is the plastic molding in the upper right portion of the front chassis wall
185. rate a service test page and to set three distinct types of adjust ments Some adjustment settings are persistent 1 e they will remain in effect after a printer restart and some are nonpersistent i e they will default to factory setting after a printer restart In addition to the test print button the density control panel has four toner indicator lights along the top an LED density gauge in the middle and four input buttons along the bottom of the panel mO cO wo y Toe l COLOR SELECT Density Gauge C DEFAULT ENTER BG TEST PRINT button Press this button to generate a service test page Important If the printer is in energy saving mode you must print to the printer or restart the printer before you can run a service test page ENTER button Engages the currently selected value Note The next four items are labelled on the panel according to their density adjustment functions During other adjustments ignore the labels and the functions described below COLOR SELECT button Selects the color whose density you want to adjust Density gauge Indicates the currently selected density value for the selected color light density to the left dark to the right Note During printer ready state you can tell if the density settings are not at the factory default by looking at the center
186. ration discharge determined Environment change correction control end Densi libration Maximum density control start Shelly Callbratlo Density detected Developing bias determined Maximum density control end Halftone correction control start Density detected y Halftone correction table determined End 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Temperature Humidity Sensing System The printer has a temperature humidity sensor board installed under the far end of the toner release assembly Temperature Humidity Sensor Board Toner Release Assembly The DC controller monitors this sensor and adjusts the following high voltage values if a change in temperature or humidity is sensed e Primary charging e Transfer bias e Attraction bias e Discharge AC bias e Separation discharge In addition to the intervals specified on the previous page tempera ture humidity sensing is performed every 30 minutes while the power is turned on Note The separation discharge value can be forced on or off manually by means of the density control panel 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Density Control Halftone Correction Control Halftone Correction Table Density Circuit Density Calibration System Maximum density control is performed to stabilize the maximum density for each color This determines an optimum developing bias The gat
187. re revealed best by the grid pattern while dirty rollers are revealed by printing a solid white page Note By measuring the distance between repeating print defects you can isolate the problem to a specific roller within the printer See Roller Diameters in Chapter 2 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Separation This feature allows you to override the printer sensing system and force Voltage the separation discharge assembly on or off Forcing on is intended as Designation a fail safe in low temperature low humidity conditions where paper is not properly separating from the transfer drum and as a countermea sure in some image offset problems Forcing off is a countermeasure against toner displacement The separation voltage designation is nonpersistent After restart the designation will revert to automatic To designate the separation voltage 1 Hold down the COLOR SELECT button and press the ENTER button three times The yellow and black toner lights will flash to indicate that you are in the separation voltage designation mode 2 Using the plus or minus buttons advance the density gauge to illumi nate the LED corresponding to the desired designation The density gauge will flash whenever the selected setting differs from the previ ously entered setting Only LEDs 4 5 and 6 on the density gauge correspond to available designations dood LOEND Separation Voltage Forced OFF Au
188. rging Roller _ Photosensitive Drum DC Bias 7 ITT Step 2 When the laser beam is scanned across the photosensitive drum surface Scanning the charge in the irradiated area is neutralized and becomes an electro Exposure static latent image This is known as write black laser imaging Laser beam i Irradiated Area Nonirradiated Area 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Step 3 Developing Stage 2 Developing In this stage the toner is placed on the electrostatic latent image on the photosensitive drum making the image visible The toner used for the printer is a single component nonmagnetic toner composed of resin This toner is unique for its insulating property and is charged with negative potential by friction between the rotating cylinder and blade surface The toner comes in four colors magenta cyan yellow and black Each is contained in its own toner cartridge Each toner cartridge is housed within the toner carousel and is sequentially advanced to the photosen sitive drum in line with the rotation of the carousel See Carousel Rotation later in this chapter Photosensitive Drum AC Bias Developing Z vc Bias Cylinder _ Stirring Plate Toner Feed Roller TIT Note The irradiated areas on the photosensitive drum have a neutral charge For sake of clarity these irradiated areas are shown as plus signs
189. riter 12 600 PS Troubleshooting Print Quality Issues This topic addresses general print quality defects that can occur in the Color LaserWriter 12 600 PS Since color quality is largely subjective and some nuances are nearly impossible to describe we encourage you to familiarize yourself with all the general issues covered in this topic To learn general principles of color theory go to the Interactive Color 1 6 folder that is bundled on Service Source CD This application requires a color Macintosh with screen resolution of 640x480 Note Best quality paper will yield best results If color matching is critical discourage customers strongly from using colored or off white paper Avoid recycled paper if possible Live text prints fine but equivalent bitmapped text sometimes prints blurry and exhibits a fuzzy halo effect What is the problem When an object gets a full saturation of two colors the haloing effect normal to all laser imaging is compounded To offset this the I O controller checks incoming fonts and decreases their saturations slightly in cases where unacceptable haloing would otherwise occur For example a green font pure cyan with pure yellow might be adjusted to 80 cyan and 80 yellow This adjustment does not visu ally alter the color Since font ID drives this process bitmapped text is ignored and is imaged as a normal graphic To offset haloing in graphics you must make adjustments by hand in the sour
190. roller press solenoid P N 922 1403 SL7 Transfer drum press solenoid P N 922 1403 SL8 Transfer drum cleaner press P N 922 1403 solenoid SL9 Discharge roller press solenoid P N 922 1404 SL351 Cassette feed solenoid Part of the front sheet feeder pickup sheet feeder assembly P N 922 1358 Clutch CL1 Toner carousel brake clutch Part of the printer drive assembly P N 922 1334 CL2 Toner carousel drive clutch Part of the printer drive assembly P N 922 1334 CL3 Registration roller clutch Part of the cassette pickup assembly P N 661 0907 CL4 Fuser assembly drive clutch Part of the printer drive assembly P N 922 1334 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Motors Fans Heaters Locations The illustrations below show fan motor and fuser heater locations for the Color LaserWriter 12 600 PS and the optional sheet feeder 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Descriptions The table below describes the fan motor and fuser heaters used in the Color LaserWriter 12 600 PS Designation Name Function Availability Motor M1 Pickup motor Part of the cassette pickup assembly P N 661 0907 M2 Main motor P N 922 1370 M3 Toner carousel motor Part of the printer drive assembly P N 922 1334 M4 Drum motor Part of the printer drive assembly P N 922 1334 M5 Cleaning brush motor Part of the transfer drum cleaning assembly P N 922 136
191. s Make the connection at the transit coupling before placing the solenoid Make sure to position the left end of the white rotator arm behind the cleaning belt advance lever 95 08 24 14 44 Color LaserWriter 12 600 PS Take Apart Solenoid Assembly page 1 of 2 First Remove the top cover left cover rear cover rear shield plate and power supply Leave the paper pickup block in its out position Now 1 Disconnect the solenoid harness cable from J2014 on the mechanical controller board Remove the cable from the cable clamp on the printer chassis Disconnect the transfer drum cleaner connector from the transit coupling near the left end of the assembly Remove the four silver colored screws and remove the solenoid assembly from the printer Solenoid Harness Transit Coupling Cable MNT E Solenoid Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Solenoid Assembly page 2 of 2 2 Ifyou need to replace one of the solenoids remove the screw and lift the solenoid from the support plate Transfer Drum Cleaner Discharge Roller Press Solenoid SL9 Transfer Drum Press Solenoid SL7 Attraction Roller Press Solenoid SL6 95 08 24 14 45 Color LaserWriter 12 600 PS Take Apart Delivery Drive Assembly First Remove the top cover Now Remove the silver colored screw that secures the delivery drive assembly to the printer Swing the assembly back unhook it from the metal shaft an
192. s binary data would not The printer s ready light would flash for a while stop and then nothing would print NetWare polling If the printer was in NetWare PServer mode configuration it would likely stop polling its NetWare print queue after being powered on for more than 24 hours Name lengths increased The pserver and rprinter name length has been increased to 47 characters maximum 96 11 13 15 58 Color LaserWriter 12 660 PS How customers will be informed Installation procedures Installation Reimbursement Program Beginning October 21 1996 Authorized Apple Resellers and institutions are entitled to receive a 150 reimbursement on the installation s of the Color Laserwriter 12 660 PS Customers who purchase the printer beginning October 21 1996 are entitled to have the printer set up and installed in the location of their choice at their site A letter will be included with the printer informing customers to contact their Authorized Apple reseller or Apple directly to perform the installation This letter also stipulates special tasks for the customer to perform before a service technician arrives at their location These tasks include Preparing a suitable location for the printer Having someone available to help the service technician lift the printer from the floor to the table or counter Providing appropriate power networking connections and cabling Ensuring that a network administrato
193. s against the knob and elevates the tip of the carousel interlock Also note the other two actuators that slide into the chassis The large one nearer the hinge opens the laser shutter and the small one on the right strikes a transfer rod that actuates the door switch Observe the behavior of the main motor and the three fans When you see the main motor spin or fans rotate you know that power is at least getting as far as the mechanical controller board Watch and listen as the carousel rotates to check for presence of toner cartridges When the calibration tests begin look between the mechan ical controller board and the main fan and observe the bolt action of the cartridge press drive gear From the right angle you can also see the carousel through the left end of the printer Observe how the fuser bulb glows during warmup This glowing confirms that the fuser bulb circuit is intact Observe the solenoids as they release press drive into the cleaning brush and discharge roller At the end of density calibration observe how the cleaning belt drive solenoid behaves like a small piston to advance the cleaning belt Through the top of the printer observe the calibration patches being placed onto the transfer drum and listen as the cleaning brush is powered on to clean off the drum If the startup page prints notice the layering of colors as the paper comes to the top of the drum and finally how the separation claw actuates to skim the
194. screwdriver set e Needle nose pliers e Cotton gloves for use with transfer drum e Extraction syringe for use with the fuser assembly e Lint free paper or cloth e Photoconductor cartridge tray The following tools are recommended for servicing the printer e Vacuum designed for servicing of xerographic copiers e Magnifying loupe e Dental mirror for inspecting the oil overflow sensor Note It is highly recommended that you use magnetized screwdrivers when working on this printer 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting First Now Fuser Interlock Defeated Note Internal engine cabling is not shown for clarity Verifying Printer Operation To observe an operational engine place the printer into the validation state described below Refer to the Take Apart chapter for instructions on performing the First procedures The validation state is also the point in reassembly where you should verify printer operation Remove the top cover left cover rear cover rear shield plate and fuser access cover Make sure that all consumables are installed correctly that the front door and pickup block door are closed and that the sepa ration discharge assembly is down and resting just above the transfer drum Plug in the printer Defeat the fuser cover interlock by wedging the green cleaning brush tool between the chassis and the actuator plate If you have a PowerBook computer with pro
195. seeeeeneeseeeeeeeseeeseeeeaeeteeeeeaeeeea 3 90 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart About Solenoids 0 3 28 Ree ee 3 91 Cleaning Belt Drive Solenoid ceeceeeceeeeeeeeeeeeeeeeeeeeeeeeteaeeeeeteaeeseeeeeaeenea 3 92 Solenoid ASSEMDIY su cssseecelevedenestdesceensleedade etch ecteesetenerdeanch capdeetsenstideeceabeagie 3 93 Delivery Drive Assembly esececessceeesceeeseseeeeesaneneseeeeenseseneeaeenenenenseseeenes 3 95 About Transfer Drum Peripherals eseceeeseeeeeeneeeeeeeeeeeeeeeeeneeerenneeeeeneeees 3 96 Cleaning Drive Assembly ceeceeeeeteeeeeeeeeeeeeneeteeeeeaeeeeaeeeeeeteaeeseaeeeaeenea 3 97 Attraction Roller Drive Assembly eecceeeseeeeneeeeeeneeeeeeeeeeneeeeeeneeeeeeeees 3 98 Discharge Roller Drive Assembly eeeeceeeeseeeeeneeeeeneeeeeneeeteneeeeeeneeeeeaees 3 99 Transfer Drum Drive Assembly 0 ce eeseeeseeeeeneeeeeeeeeenaeeeeeneeeeeeneeereaeeens 3 100 Transfer Drum Cleaning Assembly ccceeceeeeeeeeeeeeeeeeeeeeeeeeseneeeeeeeeeeeeeeteaes 3 101 High Voltage Separation ASSEMDIY cecceeceeeeeeeeeseeeeeeeeeeeeeeeeeteaeeteaeeeaeeeea 3 105 Transfer Drum ASSOMDIY ceeeceeeeneeeeeeeeeeeneeeeeeaeeeseaeeeeesaeeeseeeeseeneeeeeaeeees 3 108 Paper Delivery Assembly csecccsecceeeseeeeseseeeceneneeeneeeecnseseeeeaaeeenenensesenenes 3 110 Printer Drive Assembly ccceseceeeecceeeeceeeeeeeeeeeseneneneeeeensesee
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197. sition Sensor Assembly page 1 of 2 First Remove the top cover left cover rear cover rear shield plate mechan ical controller mount and board and main fan Now 1 Disconnect the cable from the cable clamp and remove the three silver colored screws that secure the position sensor assembly to the chassis Cable Clamp 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Position Sensor Assembly page 2 of 2 2 Disconnect the cable from the transit coupling at the right edge of the printer drive assembly For clearance purposes press the coupling inward through the flange to get it out of the way of the position sensor plate Remove the sensor plate and press drive gear from the printer Transit Coupling Press Drive Gear Sensor Plate 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart First Now Carousel Manual Rotary Assembly page 1 of 2 Remove the front door toner carousel guide panel top cover left cover rear cover rear shield plate mechanical controller mount and board and main fan Remove the brass colored screw and slide the knob disk and spring off the end of the shaft 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Carousel Manual Rotary Assembly page 2 of 2 2 Remove the four silver colored screws that secure the carousel manual rotary assembly to the chassis lift the carousel interlock to clear the gray plastic support at the knob end of the assembly
198. specified period of time after it is detected at the transfer drum registration position e The white band is detected after a specified time subsequent to that Unit Second Registration Position Transfer Drum Top Sensor PS7 Jam Check Delivery Paper Sensor PS9 Main Motor M1 T8 1 49 T9 1 57 T10 1 64 or Unit Second Registration Position Transfer Drum Top Sensor PS7 Jam Check Delivery Paper Sensor sto O 3 Main Motor M2 T11 3 29 Unit Second PRINT Registration Position Unit Second Registration Position 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Wrong Paper The CPU detects the paper size with the paper leading edge sensor Length Feed PS303 It determines that a wrong paper size feed jam has occurred if Jam it detects paper shorter than 9 05 230 mm or longer than 14 96 380 mm 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Initial Residual The CPU determines that an initial residual jam has occurred under the Jam following two conditions If any of the following sensors detects the paper a specified period of time 0 5 or 2 27 seconds after the power switch is turned on Registration paper sensor PS302 Paper leading edge sensor PS303 Separation sensor PS7 Paper delivery sensor PS9 After the power switch is turned on and the transfer drum rotates if
199. spect of its architecture is designed to a 600 dpi specification In addition its 8 bit per pixel capability can assign levels of color or gray to each pixel thereby further enhancing print quality 96 09 11 09 27 Color LaserWriter 12 600 PS Basics amp Theory Printer Fonts Life Expectancies The following fonts are resident in the printer ROM e AvantGarde Book AvantGarde BookOblique AvantGarde Demi AvantGarde DemiOblique e Bookman Demi Bookman Demiltalic Bookman Light Bookman LightlItalic e Courier Courier Bold Courier BoldOblique Courier Oblique e Helvetica Helvetica Bold Helvetica BoldOblique Helvetica Narrow Helvetica Narrow Bold Helvetica Narrow BoldOblique Helvetica Narrow Oblique Helvetica Oblique e Helvetica Condensed Helvetica Condensed Bold Helvetica Condensed BoldOblique Helvetica Condensed Oblique e NewCentury Schoolbook Bold NewCentury Schoolbook Bold Italic NewCentury Schoolbook Italic NewCentury Schoolbook Roman e Palatino Bold Palatino BoldItalic Palatino Italic Palatino Roman e Symbol e Times Bold Times BoldItalic Times Italic Times Roman e Zapf Chancery Mediumltalic e Zapf Dingbats Minimum life expectancy for the printer is 5 years or 300 000 pages in black and white or 150 000 color pages with no monthly page limit Recommended maintenance interval is 60 000 pages due to wear on fuser and rollers Toner Cartridge 4 000 pages per color when printing documents w
200. ssccascesicacstecesesdehaacecareesedhaseebasticudssrecendaiGeessseseaiens 1 127 Paper Top Position Delay Jam 0 0 eceeeesceeesneeeseneeeeeeneeeeeneeeseneeeeeeeeeenaees 1 128 Grip EA E aAA ta ee ait at inta asada isn ATAT 1 129 Separation Delay Jam eccecceesseesceeeseeeeeeeeseeseseeeeeeseaeeteaeseseessaeeeeeeseaeeeee 1 130 Separation Stationary Jam eceecceeeeeeseeeeeeeeeeeeeeeeseeeeeeeeseaeeeeeeseeeseeeeeeened 1 131 Delivery Delay Jam 22 2 ce Gis sien ih avn Steins Baths 1 132 Delivery Stationary Jam eecceecccecceeeeeeeneeeeeeeeneeteaeeeaeeseaeecseeseaeesseeeeeeeaees 1 133 Multi Fed Paper Stationary Jam cceecececeeeeesseeeeeeeeeeeeseeeseaeeseeeseeeeeeeeeaes 1 134 Non Dedicated Transparency Jam cecceeeseeeeeseeeeesneeeeeneeeseneeeetnneeeeeae 1 135 Wrong Paper Length Feed Jamo eeeseeeseeeeenneeeeeneeeeseeeeeneeeeseneeeneeeees 1 136 Initial Residual Jain 0 ccceceececeeeceeseeceeeseeeeeeeeeeesneeenesaneeseseeeseseeenenenseeescees 1 137 VI System Interface CUT cs ses stesso cos a e a Lt neds eee a iaae 1 139 Video Interfaco a A oddvoevucencdeuuun A 1 140 VII Power Supply Outline en f sda enie ada ec neo cate i dete ian sete ett ease 1 143 Remote Switch scccatccte acc eds Nestea Gee eth a vee 1 145 VillSheet Feeder Outline of Electrical Circuit isisisi eseeceesbeveceeceetetties dacneedisaeaevderecetenesees 1 147 Sheet Feeder Controller Board Input Output 2 00 ceeeeeeeeeeeeeeeeeeseeeeneeeeeees
201. sseneneeeneesseeeeees 3 112 Toner Sensor Emitters aerae rea a ae eT iA aare A EE ease aea AES 3 114 Toner Sensor Receiver c eeeeeeceteeeeeeeeeeeeceeeeaeeseeeeaeeeaeeeseeseaeeeeeteaeeeneeteaes 3 115 Oil Sensor ASSEMBLY sci scetececvuatasacensceectcenaecenanenseseestepaaeessncehansnaesseacsandensacedsanais 3 118 Disposal Box Cover Assembly eccceeseeeeeeeneeeeeeeeeeeseeeeeeeeseeeeaeeseeeseeeseneenaes 3 120 Toner Release ASSOMDIY cesccecesenceeeseceeesneceensneeseseeeeseeeeeeeseeesenenenseseeenes 3 122 Temperature Humidity Sensor 02 eeceeeceseceeeneeeeeeeeaeeeeeeeeeeteeeteaeeteaeeeaeened 3 124 Ejection Sensing Board c sis iigavieaed ede ities ieee 3 125 Cassette Size Sensing Board ceeceeeceeeeeeeeeeeeeeeceeeeeaeeseaeeseeseaeesseeeeeeeeaees 3 128 Position Sensor ASSOMDI cesccesceeeseeeseeteaeeseeeeeaeeesaeeeaeesseeeeaeeeeeeeeeeeaeteaes 3 133 Carousel Manual Rotary Assembly ceecceeeeeeeeeeeeeeeeeeeeeeseeeeeaeeseeeeeeeneees 3 135 Toner Carousel Interlock 0 eeeeeeceeeeeseeeeseeeeeeeeeseeeeaeeeseeeeaeeseeeseaeeteaeeeaeetea 3 137 Toner Carousel ASSOMDIY ceecececeeseeeeneeceeeeeaeeceaeeeaeeeaeeeseeseaeeeeeseaeeeeeeteaes 3 138 Sheet Feeder Removal cecceescecesceeseeteneeeeeeeeaeeceaeeeaeessaeeceessaeesieeeneeeaees 3 143 Sheet Feeder Front Cover ecccescceesceeseeeeneeeeeeeeaeeceaeenaeeseaeesaeessaeesieeseaeeeaees 3 145 Sheet Feeder Rear Cover c cecce
202. st Now Power Supply page 1 of 2 Remove the top cover left cover rear cover and rear shield plate Slide the paper pickup block outward as described in step 1 of the Paper Pickup Block Removal topic Release the tab that secures the black power switch cable cover to the pickup block side of the chassis wall the lower of the two cable covers in that area Pull the cable cover away from the chassis and disconnect the power switch connector from the transit coupling Power Supply WI Cable Cover Transit Coupling 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Power Supply page 2 of 2 2 Remove the five silver colored screws and the six connectors along the edges of the power supply and remove the power supply from the printer Replacement Note The two metal tabs at the bottom of the power supply nest over the edge of the chassis frame 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart High Voltage Power Supply First Remove the paper cassette top cover left cover rear cover rear shield plate and power supply Leave the paper pickup block in its out posi tion Now Remove the two brass colored screws that secure the high voltage power supply to the chassis Remove the silver colored grounding screw Disconnect the four connectors and pull the high voltage power supply out of the printer 2 High Voltage Power Supply Replacement Note You can guide the rear edge of t
203. st always caused by dirty or damaged rollers By measuring the tracks on the page and noting the side of the page that the tracks are on you can isolate horizontal defects to a specific roller within the printer The following chart shows the major rollers within the printer and the kinds of defects caused by them Roller Upper Fuser Roller Interval on Page 5 27 134 mm Possible Defects Repetitive tracking on front of page Lower Fuser Roller 5 27 134 mm Repetitive tracking on back of page Photosensitive Drum 5 07 129 mm Repetitive tracking on front of page Developing Cylinder 1 96 50 mm Repetitive blank spots or tracking on front of page Primary Charging Roller Repetitive blank spots or tracking on front of page Attraction Roller Repetitive tracking on front or back of page Discharge Roller 1 96 50 mm Repetitive tracking on back of page Cleaning Brush 1 49 38 mm 1 96 50 mm 3 70 94 mm Repetitive tracking on back of page Note Faint tracking of calibration patches on the back of the page indicates a problem with the cleaning brush 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting ll Startup Tests and Diagnostics 98 05 08 09 00 Color LaserWriter 12 600 PS Troubleshooting Power On Self Test POST Movie Startup Tests When you switch on power all the status panel lights il
204. starts rotation the CPU will stop it and notify the I O controller of this scanner failure Scanner DC Controller Board Driver J108 29 PRNT J102 10 J102 11 SCNCLK J102 6 gt SCNON J102 8 gt 5V SCNRDY 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory IV Image Formation System Color LaserWriter 12 600 PS Basics amp Theory Outline The image formation system is the nucleus of the printer Its major components are the photoconductor cartridge transfer drum toner carousel with toner cartridges and fuser assembly Fuser Photoconductor Cartridge Photosensitive Assembly Drum Primary Charging Roller Separation Discharge i Developing Cylinder SN 3 P SI Transfer Drum Cleaning Brush Discharge Roller Attraction Roller Toner Carousel Upon receiving the PRNT signal from the I O controller the DC controller completes the designated processing and sends the print sequence command to the mechanical controller The mechanical controller drives various motors and the press cams which transfer drive throughout the image formation system The primary charging roller negatively charges the surface of the photosensitive drum just before the drum surface is irradiated by the laser beam The latent image formed across the photosensitive drum is made visible by toner from the toner cartridge and th
205. t to L the primary charging AC voltage select signal HV1ACO is set to L and the primary charging DC voltage select signal HV1DCO is set to H to apply the primary charging voltage to the photosensitive drum 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory After charging for a specified period of time the HV1DC1 signal is set to H the application of the primary DC voltage is stopped and the discharging current value is measured by the photosensitive drum thickness detection circuit on the high voltage power supply board The measured current value is sent from the high voltage control IC to the mechanical controller as the drum thickness sense signals SENSEO and SENSE1 The mechanical controller converts these signals into the corresponding time data and sends them to the DC controller Based on these signals the CPU on the DC controller determines whether the photoconductor cartridge has been replaced with a new one and whether the photoconductor is installed in the printer Primary Charging Roller Photo sensitive Drum Drum Separation High Voltage Power Supply Photosensitive Drum Thickness Detection Circuit Current Detection Circuit Current Voltage Conversion Circuit Ly Amplification gt Filter Circuit Amplification i Circuit gt Voltage Pulse Width Conversion Circuit Mechanical Contr
206. te Band Feed Direction The paper leading edge sensor is a reflective type sensor In order to prevent sensor malfunction due to LED deterioration the printer detects the intensity of light emitted by the LED during the initial rota tions The cassette pickup board sets the detection level based on the intensity detected The emission level of the LED of the sensor is changed in two steps using the LED power select signal LEDDRV If it detects that the intensity is low due to the deterioration of the LED IC301 will change the LEDDRV signal to increase the intensity 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory IC301 IC302 PS301 PS302 PS2 PS1 PS303 M1 SL1 SL2 CL3 Cassette Pickup Board The cassette pickup board carries out serial communication with the mechanical controller to control the pickup operation Controls communications with the mechanical controller and the opera tion of the cassette pickup board Controls the operation of the pickup motor Cassette paper sensor When there is no paper in the cassette the cassette paper sensor signal CPSNS goes H Registration paper sensor This sensor is located on the feed side of the registration roller When paper is detected the registration paper sensor signal REGSNS goes L Manual feed paper width sensor When paper on the manual feed tray is B5 or smaller the manual feed paper size sensor signal MP
207. tection Circuit TH ap Thermistor E age ahg Fuser Assembly 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory The safety circuit IC Z4 in the power supply unit monitors the fuser temperature detect signal THI sent to pin 14 If the voltage output from the thermistor becomes about 1 6 V with an increase in the fuser temperature the safety circuit IC will set the output of pin 5 to L and turn off the relay RL to shut off the power supplied to the fuser heater Simultaneously the safety circuit sensing signal SFSNS sent to the CPU on the DC controller goes H With this setting the CPU deter mines that a failure has occurred in the fuser assembly and notifies the I O controller of a power supply failure To reset the fuser safety circuit turn off the printer for about 30 minutes or discharge jumper JP102 on the DC controller board 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fuser Error C Located in the power supply unit the fuser abnormality detection Abnormality circuit monitors the fuser assembly for voltage compatibility and fuser Detection heater continuity Circuit Error Voltage compatibility The fuser assembly abnormality detection circuit checks that the rated voltage of the power supply unit matches that of the fuser assembly For example if the fuser assembly for 220 V is connected to the power supply for the 10 V version the cir
208. tes the scanner motor Note The APCENB signal goes L when the 5 V and 24 V power supplies are at the specified voltage 2 The CPU sets the forcible laser on signal LSON to L and the video enable signal VDOENB to L via the gate array It changes the D A output value of the APCUP signal and gradually increases the laser diode current When the laser current increases the laser diode starts emitting the laser beam The intensity of the laser beam emitted by the laser diode is detected by the photodiode PD and its output voltage is fed back as the laser power detect signal PDIN to the APC IC 3 The CPU monitors the PDIN signal Until its value reaches the spec ified value stored in the CPU step 2 is continued 4 The between pages APC described below is subsequently performed during the remaining period of the initial rotations to correct the offset from the target value 5 The CPU sets the LSON signal to H to complete the initial APC and then proceeds to the between pages APC 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Between Pages APC Horizontal Sync Control Immediately after the initial APC the printer performs the between pages APC for pages and colors The CPU sets the VDOENB signal to H during the unblanking period Note In order to detect the BDI signal the laser diode is turned on even during the period that it does not scan the laser beam across t
209. th the assembly and finish sliding it from the printer Do not scrape the surface of the drum against the chassis Transfer Drum Assembly Replacement Note The discharge roller on the transfer drum has a metal plate extension that is designed to rest against the white discharge roller drive cam Make sure that this plate extension is in contact with the cam and that the extension is above the metal shaft 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Paper Delivery Assembly page 1 of 2 First Remove the top cover fuser oil bottle fuser assembly cleaning belt drive solenoid and delivery drive assembly Now 1 Disconnect the connector at cleaning belt sensor PS5 at the left end of the paper delivery assembly Paper Delivery Assembly PS5 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Paper Delivery Assembly page 2 of 2 2 Release the flex tab and shift the assembly to the right to unhook the claws Remove the assembly from the printer 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Printer Drive Assembly page 1 of 2 First Remove the toner disposal box photoconductor cartridge toner cartridges I O controller board fuser assembly top cover inner panel 1 delivery drive assembly left cover rear cover rear shield plate fuser fan mechanical controller mount and board high voltage separation assembly paper pickup block and transfer drum assembly Now 1 Remo
210. the four rearmost silver colored screws that secure the I O board housing to the chassis raise the housing slightly and hold it I O Board Housing SS Oo oe 3 Grasp the high voltage separation assembly and shift it firmly to the left to release the claw Remove the assembly from the printer 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart High Voltage Separation Assembly page 3 of 3 Replacement Note Make sure to place all of the cabling securely into the proper cable guides High Voltage Separation SAS Assembly Ee lh we 588 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Transfer Drum Assembly page 1 of 2 First Remove the toner disposal box photoconductor cartridge toner cartridges inner panel 1 top cover and pickup block Raise the separa tion discharge assembly Caution Use cotton gloves when working with the transfer drum Do not touch the surface of the drum with your hands If the surface gets soiled use only lint free paper or cloth to clean it Now 1 Disconnect the 13 pin connector from the end plate of the transfer drum assembly and remove the five silver colored screws 13 Pin Connector 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Transfer Drum Assembly page 2 of 2 2 Lower the transfer drum lever Grasp the rounded opening in the transfer drum end panel and slide the assembly halfway out Place your other hand undernea
211. the fuser assembly P Ns 661 0900 661 0901 PS14 Calibration density sensor Part of the density sensor assembly P N 922 1310 Thermistor TH Detects the surface temperature of Part of the fuser assembly the lower fuser roller P Ns 661 0900 661 0901 Thermoswitch TP1 Detects abnormally high Part of the fuser assembly temperature of the upper fuser P Ns 661 0900 661 0901 roller TP2 Detects abnormally high Part of the fuser assembly temperature of the lower fuser P Ns 661 0900 661 0901 roller Sensor T H Temperature humidity sensor P N 922 1561 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Solenoids Clutches Locations The illustrations below show solenoid and clutch locations for the Color LaserWriter 12 600 PS and the optional sheet feeder CS SL351 4 i 96 05 15 10 25 Color LaserWriter 12 600 PS Illustrated Parts Descriptions The table below describes the other solenoids and clutches used in the Color LaserWriter 12 600 PS Designation Name Function Availability Solenoid SL1 Cassette feed solenoid Part of the cassette pickup assembly P N 661 0907 SL2 Manual feed solenoid Part of the multipurpose pickup assembly P N 922 1322 SL3 Cleaning belt drive solenoid P N 922 1406 SL4 Gripper drive solenoid Part of the transfer drum assembly P N 661 0906 SL5 Separation claw solenoid Part of the transfer drum assembly P N 661 0906 SL6 Attraction
212. tion and after some paper jams unfused toner may find its way onto the surface of the transfer drum The transfer drum cleaning brush is designed to scrape this residual toner off the transfer drum This function takes place following density calibration and following the opening closing of any of the doors It also occurs as a routine maintenance measure after every 100 prints Collected toner is deposited in the filter of the transfer drum cleaner Cleaning Brush Motorized Rotation Transfer Drum Transfer Drum Cleaning Assembly The cleaning brush is normally separated from the transfer drum When the transfer process terminates and the paper leaves the transfer drum the cleaning brush makes contact with the drum cleans the surface then separates from the drum Note For more information see Transfer Drum Cleaning Assembly in the Pickup Feed System section of this chapter Example The transfer drum cleaning assembly presses against the transfer drum in frame 223 of the animation just after the trailing edge of the paper has passed The assembly separates from the drum in frame 274 As noted above this press and separation of the cleaning drum assembly occurs in this way only once in 100 prints Sound The transfer drum cleaning assembly has a very distinctive whining type sound Click the icon to the left to hear a sampling of this sound 95 08 23 11 29 Color LaserWr
213. tline The high voltage power supply of the printer is controlled by the high voltage control IC IC1003 In serial communication with the mechanical controller C1003 applies voltages to the primary charging roller developing cylinder transfer drum attraction roller discharge roller separation discharge assembly and upper fuser roller in response to the instructions from the mechanical controller The primary charging roller the developing cylinder and the separation discharge assembly are charged with superimposed DC and AC volt ages The transfer drum is charged with the positive DC voltage The attraction roller is charged with negative DC voltage being superim posed onto the transfer voltage The discharge roller is charged with AC voltage being superimposed onto the transfer voltage The separa tion discharge assembly normally is charged only with DC voltage and is charged with AC voltage superimposed on DC voltage only in a low temperature and low humidity environment The upper fuser roller is charged with DC voltage i rs Upper Fuser Developing Cylinder Separation Roller Discharge lt Discharge Roller Attraction Roller AC Voltage Generation Circuit DC Voltage Generation Circuit High Voltage Separation Bd L Attraction Roller Voltage AC Bias Generation Circuit Generation Circuit AC Voltage Generation Circuit DC Bias Generation
214. tomatic Separation Voltage Determined by Sensing System Separation Voltage Forced ON 3 Press the ENTER button to engage the setting 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Registration Adjustments This feature allows you to adjust the placement of the image area on the page Registration adjustments require that the printer be placed into a service adjustment mode Consequently these adjustments are not designed to be available to end users Registration adjustments are persistent To adjust the registration Turn off the printer Press and hold the TEST PRINT button and switch the printer back on The normal startup sounds will not occur Continue to hold the TEST PRINT button down for 25 seconds at which time you will notice a slight slowing of the controller fan Press the COLOR SELECT button once The black toner light will flash to indicate that you are in the service adjustment mode In addition one of the other toner lights will illuminate steadily Keep pressing the COLOR SELECT button until you come to the setting that you want Leading Edge Registration Adjustment Cassette Edge Registration Adjustment Manual Feeding Tray Edge Registration Adjustment Using the plus or minus buttons advance the density gauge to illumi nate the LED corresponding to the desired adjustment value For leading edge registration adjustment each step in the gauge is equal to 012 inch 3 mm For the othe
215. trated Parts Descriptions 1 of 2 The table below describes the photo interrrupter sensors used in the Color LaserWriter 12 600 PS and the optional sheet feeder All of these sensors consist of two basic elements one electrical a U shaped light emitting sensor and one mechanical a flag that is actuated by some other movement within the printer When the flag of the actuator passes into the U the flag interrupts the light and the controller reacts accordingly When troubleshooting this type of sensor first check that the mechanical actuator is free to move and is not broken then concentrate on the electrical elements Designation Name Function Availability Photo interrupter PS1 Manual feed paper present sensor Sensor Actuator Part of the multipurpose pickup assembly P N 922 1322 PS2 Manual feed paper width sensor Sensor Actuator Part of the multipurpose detects B5 paper pickup assembly P N 922 1322 PS3 Toner cartridge position sensor Sensor P N 922 1353 Actuator Toner press drive gear P N 922 1713 PS4 Toner carousel position sensor Sensor P N 922 1352 Actuators Part of the toner carousel assembly P N 922 1369 PS5 Cleaning belt sensor Sensor Actuator Part of the paper delivery assembly P N 922 1340 PS6 Attraction sensor Sensor Actuator Part of the transfer drum assembly P N 661 0906 PS7 Separation sensor Sensor Actuator Part of the transfer drum assemb
216. trim cover that mate into the bottom edge of the pickup block frame Pull the trim cover out and down to clear the tabs and remove the cover from the pickup block Pickup Trim Cover 95 08 23 09 16 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 8 of 11 6 Remove the E ring that secures the hinge arm to the multipurpose pickup assembly Unpin the hinge arm from the multipurpose pickup assembly E Ring 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 9 of 11 7 Remove the two brass colored screws and remove the motor cover from the cassette pickup assembly Motor Cover NG z x aG ALL LLE ALL 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 10 of 11 8 Disconnect the two connectors from the transit couplings and free the cables from the two clamps Transit Couplings hla Cable Clamps 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Paper Pickup Block Disassembly page 11 of 11 9 Remove the silver colored screw that secures the small pivot mount to the front left edge of the pickup block Slide the mount off the block While carefully holding the pivot mount spring in place separate the cassette pickup assembly from the multipurpose pickup assembly Note The pivot mount and the pivot mount spring and screw are not a part of either of the two pickup assemb
217. ts air from behind the fuser assembly 2 Main fan FM2 Exhausts air from the area around the DC controller board and laser scanner assembly 3 I O controller fan FM3 Exhausts air from the I O board housing O Controller Fan Fuser Fan FM3 FM1 on cS i Fan Duct Main Fan FM2 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Fuser Fan FM1 page 1 of 2 First Remove top cover left cover rear cover and rear shield plate Now 1 Disconnect J2012 from the mechanical controller board If you are simply replacing the fan release the two flex type tabs and remove the fan from the printer If you are removing the fan to get to a deeper part proceed to step 2 Fuser Fan Tab J2012 Replacement Note Install the fan with the vendor label facing out 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Fuser Fan FM1 page 2 of 2 2 Disconnect J2008 and J2009 from the mechanical controller board and remove the cables from the cable guide in the fan duct Remove the brass colored screw slide the fan and duct to the left to clear the hidden claw pull the fan and duct from the printer Screw Cables to J2008 and J2009 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart 3 69 Main Fan FM2 page 1 of 3 First Remove t
218. ts the cleaning brush motor drive signal TDCON to L to drive the cleaning brush 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory 1 110 Outline Fuser Assembly The paper separated from the transfer drum is fed into the fuser assembly and then delivered from it after passing through the upper and lower fuser rollers and the fuser assembly delivery roller This delivery from the fuser assembly is detected by the delivery paper sensor PS9 For the face up tray the paper is delivered without passing over any additional roller while for the face down tray it is delivered after passing over the face down delivery roller The deflector that selects the face up delivery or the face down delivery is automatically switched by opening or closing the face up tray DC Controller Board Mechanical Controller Board Main Motor Drive Face Down Delivery Roller Oil Sensor Signal OILSNS Oil Overflow Sensor Signal OILFUL Fuser Unit Drive Signal FIXON Cleaning Belt Solenoid Drive Oil Applying Roller Paper Delivery Signal POUT Cleaning Belt Sensor Signal WEBSNS The upper and lower fuser rollers the fuser assembly delivery roller the oil applying roller the face down delivery roller and the oil pump are driven by the main motor M2 The cleaning belt is driven by the cleaning belt drive solenoid SL3 95 08 23 11 30 Color LaserWriter 12 600 PS Basics
219. two ears of the green stopper disk and does not pinch the cables behind the panel Important This panel must be reinstalled before loading toner cartridges 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Left Cover Remove the top cover Remove the two silver colored screws that secure the left cover frame to the chassis Lift the left cover upward and remove it from the printer Left Cover Replacement Note Position the five claws into the cutouts in the chassis and lower the cover until it seats securely in place 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Rear Cover Remove the top cover and left cover Release the two tabs at the upper corners of the rear cover and remove the cover from the printer Tab Rear Cover Tab Replacement Note Position the four claws into the cutouts at the bottom of the chassis before installing the cover over the shield plate 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Rear Shield Plate First Remove the top cover left cover and rear cover Now Remove the nine silver colored screws that secure the rear shield plate to the chassis Lift the shield plate and remove it from the printer 1 2 3 Rear Shield Plate AN 9 8 Tabs 7 Replacement Note The two metal tabs at the bottom of the shield plate nest over the edge of the chassis frame 95 08 23 09 17 Color LaserWriter 12 600 P
220. ty Adjustments inen eetaw entities ae de eee abeia 1 14 Test Page Pattern Selection eceesceceeeceeeeeeeeeeneeeeeeeeeeseeeeeeeseaeeeeenea 1 15 Separation Voltage Designation eecceeeceeeeeeeeeeeeeeeeeeteeeeeeeteeeseeeeeeenea 1 16 Registration Adjustments 0 0 eeeeeeseeeeenneeeeeeeeeseneeeeeeneeeesaeeetenaeeeneneeeenaaes 1 17 ll Basic Operation Paper Path Animatlon ng esrin crete eaves ne crecveneatedaevas mentee ees etn 1 19 FUNCIONS i eaa e needed au nde ee eee ee a 1 20 Outline of Electrical SySteml iicciccesievtsecpaceseh ccedecesseces sariani ien iei aiaa e tates 1 21 Outline of Major Circuit Boards cccceeccceeececeeeeeeeeeeeeeeesaeeessaeeeesneeeesseeesees 1 22 DC Controller Input Output Signals 2 0 0 eceeeeeeeeeeeeeeeeeeeeeeeeetneeeeneeeeees 1 23 Mechanical Controller Board Input Output Signals eceeeeeeeeeeeeeee 1 26 Outline Of Drive System iirrainn ES Ene aaa EEA 1 28 Ill Laser Scanner System Laser System a sccisi nee acct hina Gla ee dana ii atta 1 32 Scannel Syston ziora e e seas isyezcenhadeacea vest aiaze E oa E E AEE EEA EE 1 38 IV Image Formation System Outlines notes A ati Hi ee A sl ates 1 41 Photoconductor Cartridge c cecceeeceeeseeeeeeeeneeeeeeeeeeeseeeeaeesseeeeaeeseeeeeeeseeeeeaes 1 43 Toner Cartridge x3 i oi tie nahin hs r ae st ae eet ail 1 44 Stages Of IMAGING se seaascek Anca A A EAT 1 47 Stage 1 Electrostatic Latent Image Formation cceceeseeeee
221. uit Voltage Generation lt e i S Circuit i 8 t Transfer Roller Voltage Generation Circuit E T beadad HVSEPACO Sores Sign Train Discharge HVSEPAC1 i Conversion Generation Amplification Roller HVFre4 1 Circuit Circuit Voltage J Generation Circuit i Discharge Roller Voltage i Generation Circuit Y Current Current Current Detection Detection Detection Circuit Circuit Circuit L Short Protective Circuits of Transfer Roller Voltage i Attraction Voltage Discharge Roller Voltage HVFrel 1 4 are pulse signals 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory Voltage to Attraction Roller Voltage to Discharge Roller For full color transfer the transfer force weakens as the number of negatively charged toner particles on the paper increases as the transfer step proceeds with the first color second color and so on To counteract this effect the transfer bias is gradually increased for the second and subsequent colors Also the transfer bias control signal TRPWM is changed according to the temperature humidity sensing system so as to apply an appropriate print bias The between colors bias with a voltage value smaller than that of the print bias is applied between colors to minimize the damage to the photosensitive drum When the drum motor begins to rotate the high voltage control IC IC 1003 on the high voltage power supply board is charged with the transfe
222. ull the green handle to its full extension and slide the assembly towards the rear of the printer Remove the assembly through the left side of the printer Tabs Stopper Posts Replacement Note Pull the green handle to its full extension before seating the assembly into the slots in the chassis The handle must rest outside the two stopper posts on the ejection cassette sensor mount 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Temperature Humidity Sensor First Remove the toner cartridges front door inner panel 1 toner carousel guide panel top cover left cover and toner release assembly Now Slide the sensor board off the toner release assembly Temperature Humidity Sensor Board Toner Release Assembly 95 08 24 14 56 Color LaserWriter 12 600 PS Take Apart Ejection Sensing Board page 1 of 3 First Remove the paper cassette toner cartridges front door inner panel 1 toner carousel guide panel top cover left cover and toner release assembly Now 1 Disconnect J1601 from the ejection sensing board J1601 Ejection Sensing Board 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Ejection Sensing Board page 2 of 3 2 Remove the brass colored screw and pull the ejection cassette sensor assembly from the printer Screw Ejection Cassette Sensor Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Ejection Sensing Board page 3 of 3 3 Disconn
223. um Before the toner cartridge leaves the drum the DEVDC signal and DEVAVE signal are set to H to turn off the developing bias Note The rotation of the toner press drive gear actuates a rocker pin that opens and closes the developing bias contact This completes the circuit to the developing cylinder that is shown on the next page For more information see the Toner Carousel Assembly topic in the Take Apart chapter Developing Rocker Pin Bias Contact 95 08 23 11 29 Color LaserWriter 12 600 PS Basics amp Theory As the density adjustment signal for the developing bias DEVPWM adjusts image density according to density instructions from the mechanical controller IC1003 changes the amplitude value of the developing DC bias and the developing AC bias The DEVPWM signal varies according to image density correction control and the setting of the density control panel High Voltage Power Supply Developing Bias Generation Circuit DEVAVE HVFre3 Curve gt Forming Circuit prio gt a AC Bias Overlapping apa gt Generation O gt Circuit Constant Voltage Circuit ay i i Voltage rs Lt gt Detection Lalo ae Circuit g DEVPWM Integral a 2 Circuit z e 1 gt z Integral fe Circuit F o g Developing T a Constant Voltage Cylinder T S T 5 a z 8 oO
224. ut changing the speed of the transfer drum the feed speed would differ between the leading and trailing edges of the transparency Therefore the transparency is not separated immediately after the transfer is completed but kept on the transfer drum for one additional rotation After the transfer is completed up to the trailing edge of the transparency the rotational speed of the transfer drum is slowed down to half its normal speed At this time the photosensitive drum is sepa rated from the transfer drum so that the toner image on the transparency will not be disturbed Subsequently the transparency leaves the transfer drum and proceeds to the fuser assembly Upper Fuser Roller Photosensitive Drum Separation EO Claw Lower Fuser Roller Paper Transfer Drum Transparency Transfer drum 95 08 23 11 30 Color LaserWriter 12 600 PS Basics amp Theory Fuser Temperature Control DC Controller Bo The fuser temperature is detected by the thermistor TH on the lower fuser roller surface As the surface temperature of the lower fuser roller rises the resistance value of TH lowers and the voltage of the fuser temperature detect signal THI sent to the IC102 in the DC controller and the safety circuit in the power supply unit decreases Mechanical ard Controller TO Board Power Supply Fuser Assembly 24V t Th itch RE ermoswitc Upper Fuser Roller T TP1 T2
225. ve the six long silver colored screws that secure the printer drive assembly to the printer Printer Drive Assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Printer Drive Assembly page 2 of 2 2 For clearance purposes remove the two silver colored screws that secure the receptacle of the fuser interconnect cable to the chassis 3 Carefully remove the printer drive assembly from the printer Replacement Note Press the assembly straight inward while using a slight side to side rocking motion Give special attention to meshing correctly the gears at the right side of the drive assembly 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Toner Sensor Emitter First Remove the printer drive assembly see previous topic The toner sensor emitter is a part of printer drive assembly P N 922 1334 The circuit board portion of the emitter is also available sepa rately as P N 922 1558 Now Remove the connector and the brass colored screw and remove the toner sensor emitter from the printer drive assembly Screw Printer Drive Assembly Toner Sensor Emitter Connector Important Do not touch the sensor with your hands If it gets soiled clean it with a lint free paper or cloth 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart 3 115 First Toner Sensor Receiver page 1 of 3 Remove the toner disposal box photoconductor cartridge toner cartridges inner panel 1 to
226. ws that secure the two filter covers to the fuser chassis and remove the covers from the fuser Note You need a small thin Phillips screwdriver to get at the four screws securing the filter covers Be careful not to damage the lower fuser roller when removing these screws 1 Trim Piece 2 Filter Covers 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Overflow Sensor PS10 page 5 of 6 Note For the following step you will need a short Phillips screwdriver no more than 3 5 inches 8 9 cm in length 5 Using the short screwdriver remove the brass colored screw and lift the sensor mount plate away from the fuser Sensor Mount Plate Replacement Note Be very careful to align the flag on the actuator with the slot in the bottom of the mount plate Failure to do so could result in oil overflow conditions going undetected 95 08 23 09 18 Color LaserWriter 12 600 PS Take Apart Oil Overflow Sensor PS10 page 6 of 6 6 Remove the connector from sensor PS10 Release the four tabs and separate the sensor from the mount plate Actuator Flag Sensor and Mount Plate Tabs 95 08 23 09 18 Color LaserWriter 12 600 PS Illustrated Parts Finished Goods Parts Description The parts below are available through Finished Goods This list contains both standard and optional parts Color LaserWriter Toner Cartridge Cyan eccesceeeeeeesreteeeeeeeeeneeeees M3753G A Color LaserWriter Toner Cartridge
227. xtract oil from both the reservoir and the well before returning the fuser to Apple see Fuser Oil Extraction in Take Apart If the flag is not up then the problem is somewhere between the photo interrupter and the DC controller Replace the fuser assembly If the problem persists reinstall the customer s fuser assembly and replace the fuser interconnect cable The DC controller has detected an error in the temperature humidity sensor circuit On site check the transit coupling into which the temper ature humidity cable connects see step 1 of the Toner Release Assembly topic in the Take Apart chapter and check the connection at J2005 on the mechanical controller board Test the printer If the problem persists replace the temperature humidity sensor Note In rare instances a faulty temperature humidity cable or rear DC controller harness cable could also return this error The DC controller has detected an error in the cassette pickup circuit On site check to make sure that the cassette pickup assembly mates firmly into the receptacle connector Check the connection at J2002 on the mechanical controller board Test the printer If the problem persists replace the cassette pickup board and test the printer If the problem persists replace the cassette pickup assembly Note In rare instances a faulty rear DC controller harness cable could also return this error The DC controller has detected an error in the
228. y do not disconnect these two connectors If you are replacing the board grasp each edge of the cable and carefully pull straight up to remove the cable Reverse the action to reinstall it The cable at J112 is available as P N 922 1344 The cable at J108 is available as P N 922 1345 DC Controller Board 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Laser Scanner Assembly First Remove the I O controller board front door top cover left cover rear cover rear shield plate status panel bottom cover I O interconnect shield and DC controller board Now Remove the two silver colored grounding screws and four brass colored mounting screws that secure the laser scanner assembly to the chassis Remove the assembly from the printer Mounting Screws Grounding Screws 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart Mechanical Controller Board First Remove the top cover left cover rear cover and rear shield plate Note Perform this procedure only if you are replacing a board If you are disassembling the printer to get to a deeper part see the Mechan ical Controller Mount and Board topic Now Remove the four black screws and all the connectors going into the board and remove the board from the printer Mechanical Controller Board Replacement Note Connectors J2018 J2020 and J2021 are empty 95 08 23 09 17 Color LaserWriter 12 600 PS Take Apart First Now Mecha
229. y mechanical drive trying to rotate the carousel If there is the printer drive assembly is probably not at fault If the carousel does rotate then the toner carousel assembly is faulty only if the position flags on its rear face have been damaged If there is obvious blockage of the carousel clear it if possible You can remove the toner release assembly if you need better access Examine the toner carousel interlock If it is broken replace it If there is no evidence of blockage reconnect J2006 and J2016 on the mechanical controller board and test the printer If the problem persists work inward and confirm the cable connection at the carousel position sensor replacing the photo interrupter as required The DC controller has detected an error in the laser scanner assembly On site check connections at J102 J110 and J111 on the DC controller board and at the connectors on the laser scanner assembly Test the printer If the problem persists replace the laser scanner assembly Note In rare instances a faulty cable could also return this error The DC controller has detected a main motor error On site remove J2013 from the mechanical controller board and reconnect it Test the printer If the problem persists replace the main motor The DC controller has detected a drum motor error On site remove J2015 from the mechanical controller board and reconnect it Test the printer If the problem persists replace the printer drive
230. ze Sensing Switch Cassette CSW1 CSW2 CSW3 A4 OFF ON ON B5 ON OFF ON LTR ON LGL Cassette Absent Jams during the pickup and feed from the sheet feeder are detected in the same manner as in the printer 95 08 23 11 31 Color LaserWriter 12 600 PS Basics amp Theory Power Supply The power supply for the sheet feeder consists of 24 VDC generated by the internal power source and 5 VDC supplied by the printer The power source in the printer uses a remote switch The CPU in the sheet feeder controller board outputs the REMOTE signal to the power source in accordance with a command from the printer and turns the power supply on or off A voltage of 5 VDC is used by the sensors and the ICs in the sheet feeder controller board while 24 VDC is used to drive the motors and the solenoids The right door switch SW302 is on the sheet feeder controller board When the right door is opened this switch is turned off to shut off 24 V supplied to the drive loads With the sheet feeder installed on the printer the AC power supply is sent to the power source in the printer via that in the sheet feeder If the power cable is connected to the AC inlet on the printer by mistake the AC power supply is not sent to the power in the sheet feeder nor is 24 VDC for the feeder generated Therefore the sheet feeder controller board monitors the supply of 24 VDC by the power source and if 24 VDC is not

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