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LaserWriter 8500

1. HVPS 20 207 Dubi P202 H4 xer z Ep NN Turn Clutch i JF Cassette z Cassette Feed Main Motor Feeder ate Paper Present Sensor IPH P J z amp Cartridge Present Sensor M7 17 BI ISH LI Manual Feed 201 S irum Sensor Assembly gl ig oleno Toner Sensor PN zs Manual Feed Paper Pul 8 Is Present Sensor 134 E E Act m P23 T Registration Sensor cJ 123 34 DC a 2 Controller Layo Registration Clutch 5 Beale T A a a Sed o c E ontroller T a Te Manual Feed Solenoid 5g y BE P JJ eo P16 a 2 8 a P21 P11 P20 Lise Duplex Interface Board P J 190 180 Fuser Cover Interlock Switch I O Board Exit 5 Sensor Pg P J Full a 942 14 Stack Sensor Temp Sensor Heater Bulb Hr py Status 421 Panel P J11 Top Cover Interlock Switch o o Thermostat Fan 127 I 121 Thermal Fuse ES P J 122 P J Power Supply
2. m lol Troubleshooting Image Defects 25 Feed Direction 7 Black Horizontal Lines Run service test page If the symptom disappears the problem is likely with the I O board If the symptom persists the problem is not with the 1 0 board but probably with the laser scanner assembly m lol Troubleshooting Image Defects 26 8 Skewing Print from the multipurpose tray If the symptom disappears the problem is likely with the cassette Remove the bottom cover of the cassette and inspect the small white pinion gear that engages the two toothed width racks Replace the cassette tray if the pinion gear is damaged If skewing occurs from both paper sources check that the paper is within specification If the problem persists refer to the LaserWriter 8500 TIL article 24603 on paper skewing and to the symptom Paper Skewing in the Troubleshooting Addendum 12 99 section later in this chapter m lol Troubleshooting Image Defects 27 9 Bad Fusing Run the EPOST diagnostic If EPOST is inconclusive check all connections going into the fuser assembly If connections are okay the problem is likely with the fuser i assembly or power supply m lol Troubleshooting Image Defects 28 10 Blank Spots Make sure that the paper and environmental conditions are within specifications m lol Troubl
3. Take Apart Duplexer Full Stack Sensor amp Actuator 179 Full Stack Actuator Full Stack Actuator 1 Using needle nose pliers grasp the tip of the actuator farthest from the sensor and flex the actuator leftward and inward to release it from its right collar Second 2 Rotate the actuator so that the flag clears the U of the sensor release the actuator from its left collar and remove the actuator from the duplexer n lol Take Apart Duplexer Offset Guide Arm 180 Offset Guide Arm Before you begin remove the following e Duplexer from the printer e Left cover Offset Guide Arm quip Duplexer Offset Guide Arm 181 Offset Guide Arm Offset Actuator Guide Arm Actuator Position During Replacement Offset Guide Arm 1 Rotate the offset actuator clockwise as far as it goes and flex it outward to free it from the guide arm 2 Remove the screw and pull the guide arm out of the duplexer chassis m lol Take Apart Duplexer Offset Assembly 182 Offset Assembly Before you begin remove the following e Duplexer from the printer Upper cover Left cover Right cover Offset guide arm quip Duplexer Offset Assembly 183 Bearings Bearings 1 Set the duplexer with the top side facing down Remove the two screws securing the carriage support and lift the support from the d
4. Service Source LaserWriter 8500 gt Service Source Overview LaserWriter 8500 mn About This Overview 1 About This Overview This overview briefly describes the servicing issues of the LaserWriter 8500 especially those that distinguish it from earlier Apple laser printers 360 Degree View LaserWriter 8500 Basic Configuration quip General 2 General The LaserWriter 8500 is a 600 dpi 20 ppm monochrome laser printer that is capable of printing onto paper up to 13 x 20 inches in size In its basic configuration the printer has a capacity of 650 sheets the standard cassette holding 500 sheets as compared to the 250 typical in earlier printers the multipurpose tray holding 150 There are several options available for the printer including a duplexer unit for two sided printing a 500 LaserWriter 8500 with sheet feeder and an envelope cassette Duplexer and Sheet Feeder amp 360 Degree View m Duplexer 3 Duplexer Through Duplexer Duplexer The duplexer is an inverted L shaped feeder that mounts onto the upper rear of the printer Once installed all paper even simplex diverts into and exits from the duplexer This is unlike the LaserWriter 12 640 PS which employs a solenoid actuated diverter controlled through software The operative element in the LaserWriter 8500 is the exchange chute located in the fuser assembly The exchange chut
5. If the paper exiting the printer slides back into the printer as shown below the exit cover 922 2765 should be replaced Refer to the Take Apart chapter in this manual to remove the part Exit Cover The exit cover provided by service has been modified slightly to eliminate this problem See the old and the modified new part below Exit Cower Heu Exit Cower Old oi Troubleshooting Toner Stains on Printed Output 44 Toner Stains on Printed Output If the printer places a light dusting of toner on the printed page if the toner is located in the center of the page or if there s a band of background toner that is three to four inches wide on the printed page the fuser roller should be replaced Note The band of toner always appears parallel to the direction of paper movement and appears to show a slight ghost image of items printed approximatley three inches earlier on the page To solve the problem 1 Inspect the fuser roller for stains without removing the fuser from the printer Open the fuser paper jam access cover to expose the fuser Note If the duplex option is installed it must be removed first 2 Lift the fuser cover to examine the lower fuser roller If the fuser roller has toner stains on it as shown above replace the fuser assembly The fuser part number is 661 1418 Refer to the Take Apart chapter in this manual to remove the part Refer to TIL article 24606 for additional info
6. L Top Cover Housing _ lol Take Apart Laser Scanner Assembly 89 the housing is also screwed to the laser scanner assembly Steps 1 5 below remove the rod from the housing The remaining steps remove the laser scanner assembly from the hinge shaft 1 Place the top cover housing on the work surface 2 Remove the four screws accessible through the cutouts in the housing that secure the actuator A oo rod to the laser scanner assembly quip lol Take Apart Laser Scanner Assembly 90 Left Spring Holder Plate 3 Right Spring Holder Plate 4 5 Remove the two screws securing the left spring holder plate and remove the plate and spring from the housing Repeat step 3 for the right spring holder plate Pull up the actuator rod and slide it out the end of the top cover housing lt gt lol Take Apart Laser Scanner Assembly 91 6 Turn the top cover housing over so that the laser scanner assembly faces up Disconnect the three cables going into the laser scanner assembly and free the cables from all clamps Pull the fuser guide lever off the end of the hinge shaft Slide the shaft to the left far enough to thread the shaft free of the two laser scanner collars quip lol Take Apart Laser Scanner Assembly 92 10 Pull the laser scanner 11 assembly toward you and raise it free of the housing Free the bottom cabling fro
7. Slow Blinking Jam LED c Fast Blinking Jam LED 1 Controller Board Error kJ Fuser Error Slow Blinking Out LED Fast Blinking Out LED ROM Error M Laser Scanner Error mY T EE m Slow Blinking Jam amp Out LEDs ES Fast Blinking Jam amp Out LEDs i General SIMM Error i Fan Error Slow Blinking Toner LED E Fast Blinking Toner LED Ene General Memory Error Miscellaneous Engine Error or Slow Blinking Toner amp Jam LEDs 3 inki a Fast Blinking Toner amp Jam LEDs SCSI Disk Error T Duplexer Error o 2 Slow Blinking Toner amp Out LEDs pis d dues Out Ecos m DC Controller Board Error loner Missing O o or faulty cartridge sensor 922 2811 Top Three LEDs Blinking Fast Toner Cartridge Emptyl or faulty cartridge sensor 922 2811 Miscellaneous engine error includes paper jams cover open missing paper cassette no paper or duplexer open Note Always check for paper jams when a miscellaneous engine error occurs Many times paper is picked up to do a test print and an error occurs When you restart the test will detect the paper jam first if the jam has not been removed ui lor Troubleshooting EPOST Extended Power On Self Test Initiating EPOST 8 Initiating EPOST To initiate EPOST you must have the printer loopback test plug P N 922 1489 Th
8. Life Expectancy Average number of impressions between failure is 180 000 pages In duplex mode a single sheet is considered to be two impressions Life expectancy is up to 14 000 pages when printing text documents with average page coverage 5 black An example of a 5 black page coverage is a page consisting of double spaced 14 point Courier type Printing images and other graphics may shorten toner cartridge life expectancy m Specifications Printing Materials 7 Paper types Paper sizes and capacity Printing Materials 16 to 28 pound laser quality bond 60 to 105 g m 2 up to 36 pound 135 g m 2 stock when fed manually through the multipurpose tray Accepts most textured and colored stock Accepts medium weight photocopier transparencies and labels Envelopes can be printed from the multipurpose tray or from the optional envelope feeder The paper used should not scorch melt transfer material or release hazardous emissions when heated to 200 C 400 F for 0 1 seconds The paper cassette holds 500 sheets of 20 pound 75 g m 2 paper The multipurpose tray can hold up to 150 sheets of standard U S letter paper and other paper sizes from postcard up to U S legal An optional 500 sheet feeder and cassette is m Printing Materials 8 Specifications Standard 500 sheet cassette Multipurpose tray available An envelope feeder that can automatically feed up to 50 enve
9. Right cover 1 Set the duplexer flat on the work surface Lower Feed Roller quip Duplexer Lower Feed Roller 188 Bearing amp E Ring E Ring Collar Gear amp Bearing Lower Feed Roller Drive Belt Remove the E ring at the left end of the feed roller shaft and slide the collar gear with drive belt and bearing off the shaft Remove the E ring and bearing from the right end of the shaft Remove the roller from the duplexer m lol Take Apart Duplexer Duplex Motor 189 Duplex Motor Before you begin remove the following e Duplexer from the printer e Right cover Duplex Motor lt p Take Apart Duplexer Duplex Motor 190 1 Disconnect the cable BA going into the motor EZ 2 Remove the two silver colored screws that secure the motor to the chassis gt gt NIC p Duplex Motor 3 Remove the motor from the duplexer m Service Source Troubleshooting LaserWriter 8500 m Troubleshooting L 8 Paper Jam C Paper Out L k Toner C Ready About the Status Panel 1 About the Status Panel The LaserWriter 8500 has a status panel that consists of four LEDs The status reported through the LEDs is generated by the 1 0 controller board based upon signals that the board receives from the printer sensing system and other engine monitoring mechanisms There are two types of reporting e
10. colored screws that secure the receptacle to the inlet holder and lift the holder from the power inlet e Take Apart Screw Power Supply Screw Power Supply 48 Disconnect all the cables going into the power supply Replacement Note Connector P127 is not used in this printer The single wire orange cable goes into the P123 lead to the right of P127 Remove the four screws securing the power supply to the chassis two through the circuit board and two through the flange at the bottom e Take Apart Power Supply 49 Shift the power supply slightly to the left pivot the bottom upward to clear the chassis frame and remove the power supply from the printer all Take Apart High Voltage Power Supply 50 High Voltage Power Supply High Voltage Power Supply Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board DC controller board with holder e Take Apart Screw High Voltage Power Supply 51 Disconnect all the cables going into the high voltage power supply Remove the brass colored screw in the center of the board Remove the four screws one at each corner of the board that secure the high voltage power supply to the chassis Take Apart High Voltage Power Supply 52 4 Holding the density dial with your finger lift the high voltage power supply from the
11. end of the board to the chassis frame LE gt b Duplex Interface Board o Take Apart Duplex Interface Board 38 3 Pull out on the right end of the board to free the receptacle connector on the opposite side 4 Slide the board to the right and remove it from the printer gt m gt lt LI c B all Take Apart DC Controller Board DC Controller Board 39 DC Controller Board Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board all Take Apart Screw Location for Board Only Removal DC Controller Board 40 1 Disconnect all the cables going into the board Note If you are replacing the DC controller board perform step 2 and you are done If all you need is access to a deeper part go to step 3 2 Remove the four screws that secure the control ler board to the chassis one at each corner of the board and remove the board from the printer all Take Apart Screw Screw Screw Location for Board and Holder Removal DC Controller Board 41 Note The following steps remove the DC controller board holder along with the board Remove the cables from the cable clamps Remove the four screws that secure the control ler board holder to the chassis two along the top flange one to the right of the density dial and one below the
12. left top cover to release the detent and rest the cover on its side atop the chassis Disconnect the status panel cable and remove the cover lt 1111 gt lol Take Apart Left Top Cover 6 Note The status panel is not part of the left top cover but is available separately as P N 922 2767 Caution With the left or right top covers removed fingers are no longer fully protected from the closure of the top cover Whenever possible keep the top cover closed If you must work with the top cover open however first make sure that it is all the way up in the latched position In addition place a temporary support a piece of folded cardboard cloth newspaper etc in the space beneath the side flange of the top cover Temporary Support For Top Cover m lol Take Apart Left Cover Assembly 7 EN Left Cover D Assembly pude No preliminary steps are required before you begin this procedure ui Left Cover Assembly 8 1 Loosen the two knurled captive screws securing the left cover assembly 2 Slide the cover to the left to free its front edge and remove the cover from the printer m Front Left Cover 9 Front Left Cover Before you begin remove the following e Left top cover e Left cover assembly lol Take Apart lt p Front Left Cover Front Left Cover 10 1 Relea
13. right Caution The sensor actuator will be hanging loose below the sensor assembly Be very careful not to damage it during the following steps ui Manual Feed Sensor Assembly 97 Manual Feed Sensor Assembly Lift the left end of the sensor assembly from the printer frame just enough to get access to the two cable connectors Carefully disconnect the two cables and remove the sensor assembly from the printer m ol Take Apart Manual Feed Paper Present Sensor 98 Manual Feed Paper Present Sensor Before you begin remove the manual feed sensor assembly Manual Feed Paper Present Sensor Inside Manual Feed Sensor Assembly Take Apart Manual Feed Paper Present Sensor 99 1 1 Disconnect the cable Paper Present going into the manual Sensor oP feed paper present sensor and free the cable from the clamp 2 Remove the brass colored screw securing the black actuator holder Paper Present to the assembly bracket Actuator 3 Release the two hooks and remove the actuator holder from the bracket 4 While protecting the actuator squeeze the hooks on the sensor and remove the sensor from Bracket of Manual Feed the actuator holder Sensor Assembly 4 p ol Take Apart Manual Feed Paper Present Actuator 100 Manual Feed Paper Present Actuator Before you begin remove the manual feed sensor assemb
14. to 95 F 0 to 35 C Humidity 15 to 80 percent relative humidity noncondensing Temperature 32 to 95 F 0 to 35 C Humidity 15 to 80 percent relative humidity noncondensing About 13 in or 32 cm m Specifications Environmental 15 Voltage requirements Power consumption U S 90 to 132 VAC 47 to 63 Hz 100 to 120 nominal voltage 50 to 60 nominal Hz Europe and Australia 198 to 264 VAC 47 to 63 Hz 220 to 240 nominal voltage 50 to 60 nominal Hz Important There are four parts in the printer that are voltage specific the power supply the fuser assembly the transport chute assembly and the DC controller board Refer to the Parts chapter for more information Energy saving mode 26 watts W Standby average 100 120 volts V approximately 125 W 220 240 V approximately 120 W m Specifications Environmental 16 Operating average 110 120 V approximately 390 W 220 240 V approximately 370 W Maximum power consumption 120 V approximately 840 W 6 3 amperes A 240 V approximately 860 W 3 2 A m Service Source Take Apart LaserWriter 8500 mn General 1 General Before you begin perform the following procedures e Switch off power and unplug the printer e Remove duplexer and or sheet feeder if applicable e Remove cassette e Remove toner cartridge Before working on any printed circuit board ground yourself and your equipment to
15. Gear armature of the pickup solenoid Armature Manual Feed Pickup Solenoid View Through Cutout in Left Chassis Wall lt p Take Apart Manual Feed Pickup Solenoid 110 2 Rotate the rotor of the main motor clockwise 7 until the pickup gear stops Motor quip Manual Feed Pickup Solenoid 111 Cutout in Left Chassis Wall Manual Feed Pickup Solenoid 3 Press down again on the pickup solenoid arma ture Remove the spring that goes between the pickup gear and the body of the transport chute assembly Disconnect the pickup solenoid cable Through the opening in the chassis wall remove the screw and lift the solenoid from the transport chute assembly n all Take Apart Separation Pad Assembly 112 Separation Pad Assembly Before you begin remove the following e Fuser access cover Right top cover Right cover Manual feed sensor assembly e Manual feed pickup rollers 1 Open the top cover and keep it open while you perform the steps below Separation Pad Take Apart Separation Pad Assembly 113 2 Remove the three screws securing the registra tion guide plate to the transport chute assem bly and remove the plate from the printer lt p Separation Pad Assembly 114 Center Core Roller 3 Remove the E ring securing the right
16. Motor 167 Offset Motor Before you begin remove the following e Duplexer from the printer e Left cover Offset Motor quip Duplexer Offset Motor 168 ___ Offset Guide Arm Offset Actuator Guide Arm Actuator Position During Replacement 1 Disconnect the offset motor cable from the duplexer board 2 Remove the two screws and lift the motor out of the duplexer Replacement Note Tilt the motor slightly to the right and insert the offset actuator into the offset guide arm m lol Take Apart Duplexer Duplexer Board 169 Duplexer Board Before you begin remove the following e Duplexer from the printer e Left cover e Offset motor Duplexer Board quip Duplexer Duplexer Board 170 1 Disconnect the cables from the duplexer board 2 Remove the fours screws securing the duplexer board and remove the board from the duplexer Duplexer Board 4 gt lol Take Apart Duplexer Upper Cover Interlock Switch 171 Upper Cover Interlock Switch Upper Cover Interlock Switch No preliminary steps are required before you begin this procedure quip Take Apart Duplexer Upper Cover Interlock Switch 172 1 Open the upper cover 2 Squeeze the top and bottom of the switch to release the tabs and pull the switch away from the duplexer chassis ee 3 Disconnect the
17. No preliminary steps are required before you begin this procedure quip er Take Apart Duplexer Lower Cover 163 Duplexer Lower Cover 1 Hold the lower cover half way open slide the cover to the left and release the right side hinge pin Release the left hinge pin and remove the cover from the duplexer Replacement Note There are two hinge holes on each side of the framed opening Install this cover in the lower set of holes 3 Perform the Taping The Paper Pass Actuator procedure if you have also removed the upper lt gt a Take Apart Duplexer Taping The Paper Pass Actuator 164 Taping The Paper Pass Actuator Any time you have the upper and lower covers removed the paper pass actuator is exposed and extremely vulnerable to damage To protect the actuator tape it shut temporarily with removable tape or a Post it note Please remember to remove the tape prior to reinstalling the covers N Protective Tape m lol Take Apart Duplexer Front Cover 165 Front Cover Front Cover Before you begin remove the following e Duplexer from the printer e Upper cover e Left cover e Right cover quip Duplexer Front Cover 166 Take Apart Front Cover 1 Remove the two screws that secure the front cover to the duplexer 2 Remove the front cover from the duplexer m lol Take Apart Duplexer Offset
18. cable and remove the switch from the duplexer Upper Cover Interlock Switch m lol Take Apart Duplexer Lower Cover Interlock Switch 173 Lower Cover Interlock Switch Before you begin remove the following e Duplexer from the printer e Lower cover Lower Cover Interlock Switch quip lol Take Apart Duplexer Lower Cover Interlock Switch 174 1 Disconnect the cable going into the lower cover interlock switch 2 Release the tabs using needle nose pliers if necessary and remove the switch from the duplexer Pose 4n lol Take Apart Duplexer Paper Pass Sensor 175 Paper Pass Sensor Before you begin remove the duplexer from the printer Paper Pass Sensor quip lol Take Apart Duplexer Paper Pass Sensor 176 1 Disconnect the cable going into the paper pass sensor Release the tabs and remove the sensor from the duplexer Paper Pass Sensor m lol Take Apart Duplexer Full Stack Sensor amp Actuator 177 Full Stack Sensor amp Actuator Full Stack Actuator Before you begin remove the following e Duplexer from the printer Left cover Right cover Upper cover Front cover quip Duplexer Full Stack Sensor amp Actuator 178 Full Stack Sensor Full Stack Sensor 1 Disconnect the cable going into the full stack sensor 2 Release the tabs and remove the sensor from the duplexer NL ie ui
19. imaging Standard 85 lines inch dithered halftone 101 gray levels 106 lines inch dithered halftone 129 gray levels 141 lines inch dithered halftone 73 gray levels PhotoGrade additional RAM may be required 106 lines inch halftone 201 gray levels 141 lines inch halftone 257 gray levels 150 lines inch halftone 145 gray levels PostScript Level 3 m er Specifications Imaging 5 Printer fonts Speed One hundred thirty six PostScript fonts are provided with the printer including such fonts as Albertus Antique Olive Apple Chancery Arial ITC Avant Garde Bondoni ITC Bookman Carta Chicago Clarendon CooperBlack Copperplate Coronet Courier Eurostile Geneva GillSans Goudy Helvetica Helvetica Black Helvetica Compressed Helvetica Narrow Hoefler Text Joanna LetterGothic Lubalin Graph Marigold Monaco MonaLisa New Century Schoolbook New York Optima Oxford Palatino StempelGaramond Symbol Tekton Times Univers Univers Condensed WingDings ITC Zapf Chancery and ITC Zapf Dingbats Note Actual speed depends on the images printed One sided 20 pages per minute maximum using long edge feed LEF U S letter or A4 size paper Duplex 13 pages per minute maximum using long edge feed U S letter or A4 size paper Envelopes 9 7 envelopes per minute maximum m Specifications Life Expectancy 6 Printer reliability MTBF Toner cartridge life expectancy
20. left cover e Exit cover e Front cover Top cover Fuser assembly 1 0 board Duplex interface board ui e Take Apart Transport Chute Harness Guide Transport Chute Assembly 123 1 DC controller board Manual feed sensor assembly Transfer roller Top cover housing Disconnect all the cables that route through the transport chute harness guide and free the cables as necessary from all cable clamps Note Most of the transport chute harness cables connect to one of the circuit boards within the right frame Some have intermediate lol Take Apart Transport Chute Assembly 124 couplings that can be disconnected 2 Remove the eight screws securing the rear tie plate to the chassis two each along the right and left edges and four through the front face 3 Remove the rear tie plate from the chassis Rear Tie Plate ui lol Take Apart Transport Chute Assembly 125 Screws Transport Chute Harness Cable 4 Pull the transport chute harness through the chassis wall and let it hang free alongside the printer Remove the six screws securing the transport chute assembly to the chassis two each at the right and left ends and two along the inside edge Remove the transport chute assembly from the chassis m lol Take Apart Manual Feed Pickup Roller Assembly 126 Manual Feed Pickup Roller Assembly Before you begin remove the fol
21. means of the registration clutch assembly so as to register the paper with the image on the drum Registration sensor Detects the arrival and departure of the paper at the registration position Transfer roller bearing Applies the transfer voltage from the high voltage power supply to the transfer roller assembly Detack saw Imparts a negative charge to the back side of the paper partially neutralizing the positive charges so that the paper can peel off the drum Duplexer The duplexer derives its mechanical drive from the duplex motor The offset motor generates the lateral drive for job separation left to right staggering of paper in the delivery tray Gear B Duplex Motor Gear C Offset Gear Gear Gear D Pulley Gear Drive Belt Pulley Gear Basics Function of Main Components 7 Fusing and Paper Exit Fuser Assembly Temperature Sensor Assembly Pressure Roller Thermal Fuse Fuser Bulb Inside Heat Roller The fuser assembly houses all components of fusing the permanent fixing of toner to paper by means of heat and pressure as well as components for paper delivery Heat Roller The heat roller is a hollow metal tube that applies heat to the paper passing between it and the pressure roller The heat is generated by the fuser bulb inside the heat roller This heat melts the toner on the paper Pressure Roller The pressure roller is a solid sponge rubber coated metal shaft that
22. portrait and landscape are best used only when talking about how a printed page is to be formatted Remember that LEF mode for example can result in either a landscape or portrait formatted page e Load letterhead face up e As you stand facing the printer the top of the page is on the left for LEF portrait and on the near side for LEF landscape LEF Paper Orientation m Service Test Page 10 Service Test Page r Page Button Service Test Page A service test page sometimes called an engine test page is a page whose description resides in firmware on the DC controller board Successful printing of a service test page confirms the operation of the print engine Of equal impor tance if a print quality problem appearing on a normal page also appears on the service test page the I O controller board is proven good and should not be swapped There are two ways to print a service test page on the Laser Writer 8500 1 Ifthe I O board is installed use a paper clip to press the test page button This button is accessible through a small unmarked hole at the top of the I O bracket Note Use this button liberally both in person and when troubleshooting with customers on the phone It is your ui lol Overview Service Test Page 11 Test Page Jumper firs
23. presses the paper against the heat roller The pressure helps bond the toner to the paper Heater Assembly The heater assembly consists of the fuser bulb and the wiring and connectors attached to the ends of the bulb Temperature Sensor Assembly The temperature sensor assembly is a thermistor whose resistance varies sharply with a change in temperature This sensor is held in contact with the heat roller surface and monitors the temperature thereof The signal from this sensor is used to maintain the temperature of the heat roller surface within the specified range by switching the power to the heater bulb on and off The signal is also used for the first stage overheat protection Thermostat The thermostat is part of the heater bulb circuit ad functions as the second stage overheat Basics Function of Main Components 8 protection If the temperature sensor assembly fails to prevent a fuser overheat the thermostat opens and power is cut to the heater bulb Thermal Fuse Also a part of the heater bulb circuit the thermal fuse functions as the third stage overheat protection If both the first and second stages fail to prevent a fuser overheat the thermal fuse opens and power is cut to the heater bulb Heat Roller Diode There is a negative charge that builds up on the heater bulb This charge can disturb the toner image on the paper during fusing The heat roller diode grounds this charge Full Stack Sensor Exit Senso
24. printer Density Dial al redi Take Apart Connector TR High Voltage Power Supply 53 Replacement Note Connector TR at the bottom of the high voltage power supply goes in with the narrow edge facing outward Failure to connect this properly will cut voltage flow to the transfer roller resulting in very light overall print quality all Take Apart Main Motor Main Motor 54 Main Motor Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board all Take Apart Screw Main Motor 55 Disconnect the motor cable at P16 from the DC controller board Remove the three screws one through the flange at top two through the flange at the bottom that secure the main motor to the chassis e Take Apart Main Motor 56 Lift out the left side of the motor to clear the DC controller board holder and remove the motor from the printer all Take Apart Paper Handling Gear Assembly 57 Paper Handling Gear Assembly Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board DC controller board with holder Paper Handling Gear Assembly o Take Apart Paper Handling Gear Assembly 58 1 Disconnect the cable Screw Cable Screw going into the registration clutch assembly 2 F
25. seconds after which control passes to PostScript code in ROM and the normal warmup continues see PostScript Reporting in this chapter However if POST detects a fault during any stage the status panel enters an error state and flashes the paper out and paper jam LEDs forever Making note of the stage from which this error array first appears can help you choose the modules to bring on a service call For example suppose failure occurs during stage two only the Ready LED had extinguished before the error array appears This indicates an I O board failure so a replacement board should definitely accompany you on site ui Troubleshooting PostScript Reporting 4 PostScript Reporting PostScript reporting starts as soon as POST is completed Most of the time PostScript will report according to the literal designation of the LED For example the paper out LED illuminates when the paper cassette is empty However there are some instances where closer observation is critical in interpreting the status panel e Solid ready light In some cases the ready light will illuminate for as long as 15 seconds before a PostScript fault is reported Make sure to wait this extra time for PostScript to execute before shutting down to perform further troubleshooting e Behavior before PostScript error As with stage reporting during POST it is sometimes necessary to note what occurs before the error array first appears T
26. shaft Remove the lower feed roller shaft by freeing one end then the other from the chassis frame m lol Take Apart Upper Feed Roller 80 Upper Feed Roller Upper Feed Roller Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Right top cover Right cover Turn in chute Turn chute cover 1 0 board quip Upper Feed Roller 81 Upper Feed Roller Bearing Gear E Ring On the gear end of the roller remove the E ring securing the gear and slide the gear off the feed roller shaft Slide the feed bearing off the roller shaft On the right side remove the E ring securing the feed bearing and slide the bearing off the shaft Remove the feed roller shaft by freeing one end then the other from the chassis frame m lol Take Apart Top Cover Housing 82 Top Cover Housing Top Cover Housing Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Exit cover Top cover Fuser assembly 1 0 board quip all Take Apart Ferrite Core Connectors Top Cover Housing 83 Using a small flat blade screwdriver remove the ferrite core above and to the left of the DC controller board Disconnect connectors P12 and P17 on the DC controller board Remove the screw securing the grounding wire to the top of the
27. 125 x 9 5 104 8 mm x 241 3 mm 3 875 x 7 5 98 4 mm x 190 5 mm 4 33 x 8 66 110 mm x 220 mm 6 38 x 9 02 162 mm x 229 mm 3 94 x 5 83 100 mm x 148 mm 8 1 2 x 11 215 9 mm x 279 4 mm 8 1 2 x 11 215 9 mm x 279 4 mm 8 48 x 5 48 215 9 mm x 139 7 mm 10 5 x 7 25 266 7 mm x 184 2 mm mn Printing Materials 10 Optional envelope sizes and weights Optional duplex printing unit A4 LEF A4 Small LEF A5 LEF B5 LEF U S Legal SEF Tabloid SEF A3 SEF Large SEF Large SEF Envelope Weight COM10 SEF Monarch SEF DL SEF C5 SEF Paper Type U S Letter LEF U S Letter Small LEF U S Legal SEF 8 27 x 11 69 210 mm x 297 mm 8 27 x 11 69 210 mm x 297 mm 5 84 x 8 26 148 mm x 210 mm 7 17 x 10 12 182 mm x 257 mm 8 5 x 14 215 9 mm x 355 6 mm 11 x 17 279 4 mm x 431 8 mm 11 69 x 16 54 297 mm x 420 2 mm 13 x 18 330 mm x 457 2 mm 13 x 18 5 330 mm x 470 mm Size 24 Ib 4 125 x 9 5 104 8 mm x 241 3 mm 24 Ib 3 875 x 7 5 98 4 mm x 190 5 mm 80 g m 2 110 mm x 220 mm 90 g m2 162 mm x 229 mm Size 8 5 x 11 215 9 mm x 279 4 mm 8 5 x 11 215 9 mm x 279 4 mm 8 5 x 14 215 9 mm x 355 6 mm m Printing Materials 11 U S Legal Small SEF A4 LEF A4 Small LEF 5 LEF Ledger SEF A3 SEF 8 5 x 14 215 9 mm x 355 6 mm 8 27 x 11 69 210 mm x 297 mm 8 27 x 11 69 210 mm x 297 mm
28. 652 quip lol Take Apart Full Stack Sensor amp Actuator 118 Full Stack Sensor Label Cap amp Actuator Before you begin remove Actuator Cover the fuser access cover 1 Release the tabs and remove the label cap from the fuser assembly 2 Using a jeweller s screwdriver release the tabs and remove the actuator cover from the Full Stack Actuator fuser assembly 3 Disconnect the harness cable from the full stack sensor not shown ui Take Apart Full Stack Sensor amp Actuator 119 Full Stack Actuator Full Stack Actuator 1 Pinch the right end of the shaft of the actuator and pull it from its grip Slide the actuator to the right and remove it and the spring from the fuser assembly lt p Full Stack Sensor amp Actuator 120 Replacement Note Make sure that the actuator spring is replaced in the manner shown in the illustration quip Take Apart Full Stack Sensor amp Actuator 121 Full Stack Sensor Hold the actuator up so that its flag is clear of the sensor Full Stack Sensor Release the four hooks and remove the sensor from the fuser assembly m lol Take Apart Transport Chute Assembly 122 Transport Chute Transport Chute Assembly Assembly Before you begin remove the following e Fuser access cover e Left top cover e Right top cover e Left cover assembly e Right cover e Front
29. 7 17 x 10 12 182 mm x 257 mm 11 x 17 279 4 mm x 431 8 mm 11 69 x 16 54 297 mm x 420 2 mm m Dimensions 12 Specifications Basic configuration printer with A4 cassette Dimensions Height 16 2 in 41 1 cm Width 23 2 in 58 9 cm Depth 17 9 in 45 5 cm Additional dimension when adding the duplexer Height 2 9 in 7 4 cm Depth 3 0 in 7 6 cm Additional dimension when adding the sheet feeder and A3 universal cassette Height 5 2 in 13 2 cm Depth 5 9 in 15 0 cm Additional dimension when adding the sheet feeder and letter A4 universal cassette Height 5 2 in 13 2 cm n Specifications Dimensions 13 Space requirements A About 7 in Note Vertical clearance or 18 cm is about 14 in or 36 cm Y About 6 in or 15 cm G o i VA About 1 in About 17 in Exhaust Vent f 2 5 cm or 43 cm Weight Approximately 30 Ib 14 kg m Specifications Environmental 14 Operating Storage toner cartridge Storage printer Environmental Temperature 41 to 95 F 5 to 35 C Humidity 15 to 85 percent relative humidity noncondensing Altitude to 8200 feet to 2500 meters Note There is a varistor VR53 is in the upper left corner of the high voltage power supply Counter clockwise adjustment of this varistor lowers the toner threshold and increases the maximum operating altitude Temperature 32
30. Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Right cover Front left cover Exit cover Top cover housing Front cover Transfer roller Fuser assembly 1 0 board Take Apart Main Gear Assembly 143 5 i uu ee ak 5 Duplex interface board DC controller board Main motor Paper handling gear assembly Registration clutch assembly Left cartridge guide Remove the two screws securing the right top cover latch to the latch shaft Slide the right top cover latch approximately a half inch 10 12 mm to the left Slide the latch shaft ui lol Take Apart Main Gear Assembly 144 Main Gear Assembly approximately one quarter inch 5 6 mm to the right Open and hold the top cover at a right angle and release the two hold open springs from the rear tie plate Close the top cover Remove the four screws securing the main gear assembly to the chassis Slide the main gear assembly to the right and release gears and shafts from the frame Pull the gear assembly up and behind to remove it from the chassis m Sheet Feeder 145 Printer Sheet Feeder Sheet Feeder This procedure describes how to separate the sheet feeder and printer Caution The printer is heavy Please ask for help when lifting it and make sure to keep your back straight b
31. Cover m lol Take Apart Right Cover 16 Right Cover Before you begin remove the following e Fuser access cover e Right top cover Right Cover lt p Right Cover 17 Right Cover Remove the five screws that secure the right cover to the printer two at the bottom two along the rear edge and one at the top Release the detent edge of the cover where the cover wraps around to meet the cassette guide and remove the right cover from the printer m lol Take Apart Exit Cover 18 Exit Cover Exit Cover Before you begin remove the following e Fuser access cover e Left top cover e Right top cover quip Exit Cover 19 1 Close the top cover Exit Cover 2 Remove the two screws securing the exit cover one low at the right and one angled at the left Caution In the following step make sure to hold the full stack actuator clear while you remove the cover The actuator is exposed and very susceptible to damage 3 Tilt the exit cover forward to clear the actuator and lift the cover from the printer m lol Take Apart Top Cover 20 Top Cover Top Cover Before you begin remove the following e Fuser access cover e Left top cover e Right top cover e Exit cover 1 Open the top cover housing Caution Make sure you have placed a temporary support underneath the top cover as desc
32. End user reporting consists of LED arrays that can be observed by end users without need of special tools This type of reporting can be broken down into POST and PostScript reporting see following topics e Service technician reporting consists of LED arrays that can only be observed through the use of a special tool This reporting is also referred to as EPOST see topic later in this chapter Whereas end user reporting can help you in troubleshooting over the phone EPOST requires that you be at the printer location ui lol Troubleshooting POST Power On Self Test 2 POST Power On Self Test When you switch on power all the status panel LEDs illuminate briefly This confirms that power is getting to the status panel and that all LEDs are operational All LEDs then extinguish and come back on This marks the start of POST POST is a set of diagnostic procedures that are written into firmware on the I O controller board POST executes in the first 10 seconds of startup and checks the following three areas of the printer in order e Stage 1 1 0 controller ROM amp SIMMs e Stage 2 1 0 controller miscellaneous circuitry e Stage 3 D C controller board quip Troubleshooting POST Power On Self Test 3 Stage Failure POST POST extinguishes the LEDs from front to back as each test stage passes The Ready LED is considered here to be the front LED In a functional printer the testing process takes about 40
33. Fuser Assembly Power Switch Power Inlet Service Source Specifications LaserWriter 8500 mn Specifications Engine 1 Marking engine Laser Engine Fuji Xerox P880 laser xerographic Type Semiconductor laser diode Wavelength 780 nanometers nm Output power 5 milliwatts mW maximum quip Controller 2 Specifications Microprocessor ROM RAM T O processor EEPROM Controller AMD Am29040 30 60 MHz RISC microprocessor 8 megabytes MB of ROM including 136 fonts 16 MB of RAM expandable to 48 MB See RAM Memory in the Overview chapter for more information 80C186 1 0 processor 8 kilobytes KB parameter EEPROM m Specifications Ports 3 Ports General LocalTalk port Parallel port AAUI Ethernet port with three protocols EtherTalk Novell NetWare IPX PSERVER or RPRINTER TCP IP External Ethernet transceivers available for thin coaxial 1 OBASE 2 thick coaxial 1OBASE 5 Ethernet twisted pair cable 1OBASE T can connect directly to a hub Two position communication switch All ports and protocols simultaneously active but only one Ethernet connector m Specifications Imaging 4 Resolution Grayscale imaging PostScript Imaging 600 dots per inch dpi resolution 600 dpi FinePrint edge enhancement for text and line art Enhanced 600 dpi grayscale
34. S 2 Turn the transfer roller levers up at both ends 3 Holding the levers lift the transfer roller assembly upwards at a 45 degree angle and remove the assembly from the printer NX m ol Take Apart Manual Feed Pickup Roller 106 Manual Feed Pickup Roller Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Manual feed sensor assembly Manual Feed Pickup Rollers 1 Open the manual feed cover and top cover 2 Rotate the pickup shaft so that the pickup cams Manual Feed Pickup Roller 107 face downward you may have to press down on the armature of the manual feed solenoid 3 Release the tab on the smooth white core roller from the groove on the pickup shaft 4 Slide the core roller away from the pickup roller 5 Slide the pickup roller in the same direction until it clears the shaft drive pin and remove the pickup roller from the shaft i ol Take Apart Manual Feed Pickup Solenoid 108 Manual Feed Pickup Solenoid Manual Feed Pickup Solenoid Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board DC controller board Manual feed sensor assembly Take Apart Manual Feed Pickup Solenoid 109 1 Press down on the Pickup
35. an earth or building ground Use a grounded conductive workbench mat and grounding wriststrap and ground your equipment to the mat m lol Take Apart Fuser Access Cover 2 Fuser Access Cover Fuser Access Cover No preliminary steps are required before you begin this procedure quip Fuser Access Cover 3 1 Open the fuser access cover and shift it left ward to release its right hinge 2 Free the left hinge and remove the fuser access cover from the printer Note The fuser cap is the part that you remove before installing a duplexer The cap is a part of the fuser access cover P N 922 2757 Fuser Access Cover at m Left Top Cover 4 lol Take Apart e Location of Detent Left Top Cover Left Top Cover Before you begin remove the fuser access cover Note The left top cover is held to the printer by two screws a detent on the cover s bottom edge near where the three covers abut one another and the status panel cable quip Left Top Cover 5 lol Take Apart Left Top Cover Detent Status Panel Cable Status Panel Left Top Cover On Its Side Open the manual feed tray and the top cover Remove the two screws securing the left top cover to the printer frame one along the rear and one inside the manual feed compart ment Pull out slightly on the
36. ant uniform pressure from the springs As you insert the cassette the paper snugly and passively presses against the pickup rollers With this printer however the bottom plate must stay down during insertion to avoid snagging The springs are released and the bottom plate elevated against the pickup rollers only when the cassette is fully inserted This spring release is actuated by a latch on each side of the cassette near the leading edge C See Cassette in the Basics chapter for more information n Overview Paper Orientation 8 Feed Long Edge Feed LEF Feed Short Edge Feed z SEF Paper Orientation The paper path is wide enough to print letter or A4 sized paper in long edge feed LEF mode LEF mode is recom mended as it achieves the fastest 20 ppm throughput and optimizes duplex printing Note The cassette automatically senses paper orientation The multipurpose tray does not Printing in short edge feed SEF mode from the multipurpose tray may produce undesirable results Paper orientation and how best to load paper can be confusing especially when talking with customers over the phone It is further complicated when printing duplex jobs Keep in mind the following tips e Use the LEF and SEF terms when talking about how paper is loaded These are the terms found in the user manual ui Paper Orientation 9 e The terms
37. c tab on the fuser access cover and the white nylon tip at the end of the actuator rod within the top cover housing If the mechanical elements are performing correctly there may be a failure in one of the Switches connecting cables or boards ui lol Troubleshooting Flowchart 5 13 Flowchart 5 Symptom The Jam light illuminates steadily on printer startup The exit sensor and registration sensor see Sensing System Locator in Basics are the two sensors that can report jams at startup To see the exit actuator open the fuser access cover and look down the slot in the top of the fuser approximately midway left to right To see the registration actuator remove the toner cartridge and look through the acetate window above the manual feed pickup rollers Look carefully Are paper or paper remnants jammed in the printer Yes Return to O in Flowchart 8 Did the pickup roller attempt to pick up paper Yes A startup paper jam is reported if one of the two sensors described above is open This state is consistent with paper tripping the actuator A broken actuator however can have exactly the same effect Perform take apart as need to inspect the two actuators and sensors and the cable connections coming off them Replace as needed Refer to Paper Transportation and Fusing and Paper Exit in Basics for more information lt
38. chassis e Take Apart Top Cover Housing 84 _ z 4 Remove the screw and cable clamp located just Screw and Guide behind the fan and Arm Cover remove the cables from the clamp 5 Snake the two cables disconnected in step 2 through the cable guide in the chassis 6 Remove the screw and the small black fuser guide arm cover Screw and Cable Clamp _ L_ Cable Guide lol Take Apart Top Cover Housing 85 Hold Open Shaft 7 While holding the top cover housing open unseat the two torsion springs from the collars on the rear tie plate 8 Close the top cover Remove the screw at each end of the hold open shaft lt E Rear Tie Plate Collar Spring Spring Collar lt gt lol Take Apart Top Cover Housing 86 10 Raise the top cover and release the two locking feet so that the cover rests directly on the chassis Left Right Locking Foot Locking Foot lt p 3 Apart Top Cover Housing 87 Ie z 11 Lift the top cover housing from the printer frame lol Take Apart Laser Scanner Assembly 88 Laser Scanner Laser Scanner Assembly Assembly Fuser access cover Left top cover Right top cover Left cover assembly Exit cover Top cover Fuser assembly 1 0 board Top cover housing Note The laser scanner assembly is connected to the housing only at the hinge shaft A metal actuator rod running crossways through
39. chute from the cassette guide Turn Chute Cover Boss lt j Turn Chute Cover 25 Turn Chute Cover Turn Chute Cover Before you begin remove the turn in chute 1 Hold the turn chute cover half open Using needle nosed pliers remove the two turn chute springs that are installed between the turn chute cover and the left and right cassette guide assemblies Hold the turn chute cover completely open and slide to the left quip Take Apart Turn Chute Cover 26 4 Lift the rear of the rinter and pull down the right side of the turn lt chute cover 5 Slide the turn chute wos cover to the right and S 4 Pre remove it from the A printer Turn Chute Cover 4 gt Take Apart Fuser Assembly 27 Fuser Assembly Fuser Assembly Before you begin remove the fuser access cover Caution Let the fuser assembly cool before performing this procedure 1 Loosen the four captive screws securing the fuser assembly to the printer ui lol Take Apart Fuser Assembly 28 2 Grip the fuser assembly by the two small handles at each end and lift the fuser from the printer Handle Handle m ej Take Apart 1 0 Board 29 I O Board Before you begin remove the following e Fuser access cover Left top cover Left cover assembly Cables Front left cover Make a note of the p
40. d rollers to remove any skew induced during paper feed Basics Function of Main Components 10 Top Housing and Xerographics Guide Arm and Fuser Guide Lever Fuser Guide Fuser Assembly Top Cover Main Gear Assembly _ When the top cover opens the fuser guide lever presses down on the floating idler gear at the top of the main gear assembly thus disengaging the fuser assembly from the gear train This makes removal of paper jams from the fuser much easier When the top cover is closed the floating idler gear springs upward to mate the fuser gearing to the main gear train Cartridge Sensor Assembly Cartridge Present Switch LD Switch Cartridge Sensor Assembly Cartridge The cartridge sensor assembly houses the two switches below Cartridge present switch The signal from this switch stops printer operation when the toner cartridge is absent or the top cover is open Basics Function of Main Components 11 Laser diode LD switch This switch opens the laser diode circuit when the toner cartridge is absent or the top cover is open The LD switch protects users against exposure to the laser light Toner Cartridge The toner cartridge consists of five major components Photosensitive drum An aluminum cylinder with a surface coating of photoconductive material The photoconductive coating holds an electrical charge and allows the charge to flow throug
41. e Apart Left Cartridge Guide Assembly 130 1 High Voltage Power Supply Remove the center screw of the high voltage power supply this screw goes into the back of the cartridge guide Left Cartridge Guide Assembly 131 Cartridge Guide 2 Open the top cover and hold it open during the operation below Remove the screw and the grounding plate on top of the cartridge guide Remove the one long gold colored screw securing the upper part of the cartridge guide Remove the six other normal silver colored screws securing the cartridge guide From the board side of quip Left Cartridge Guide Assembly 132 Cartridge Guide the chassis wall press out the posts that secure the cartridge guide to the chassis and remove the guide from the printer m all Take Apart Right Cartridge Guide Assembly 133 Right Cartridge Guide Assembly Right Cartridge Guide Assembly Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Right cover Front left cover Front cover Transfer roller Right Cartridge Guide Assembly 134 Right Cartridge Guide Open the top cover and hold it open during the operation below Remove the screw and the grounding spring Remove the five screws securing the rear left end and front left side of the cartridge guide From th
42. e board side of the chassis wall press out the posts that secure the cartridge guide to the chassis and remove the guide from the printer n ol Take Apart Manual Feed Guide Tray 135 Manual Feed Guide Tray Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Right top cover Right cover Exit cover Top cover Front cover Manual feed sensor assembly e Left cartridge guide Manual Feed Guide Tray Manual Feed Guide Tray 136 Manual Feed Guide Tray 1 e Right cartridge guide Lift the left side of the manual feed guide tray and pull the tray out from under the cams on the ends of the pickup roller assembly Note You can rotate the pickup rollers up so that they do not interfere with the removal of the tray Lift the left front side of the tray slide it to the left and remove the tray from the printer m ol Take Apart Top Cover Interlock Switch 137 Top Cover Interlock Switch Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Right cover Front left cover Front cover Transfer roller 1 0 board Left cartridge guide Top Cover Interlock Switch Inside Left Cartridge Guide Assembly Take Apart Top Cover Interlock Switch 138 Top Cover Interlock Switch 1 Disconnect J123 o
43. e is actuated i e locked in place during installation of the duplexer After the first pass of a duplex page the paper partially exits the duplexer delivery rollers The rollers then reverse and the paper feeds back down through the duplexer and into the printer engine in preparation for imaging of the second side The paper then exits through the duplexer into the delivery tray uu Paper Path 4 The duplexer derives its power from the printer engine but has its own motor to generate mechanical drive Offset Function The duplexer has a job separation feature that allows print jobs to be stacked offset i e staggered left to right in the delivery tray Job separation is set in the Apple Printer Utility Note Due to cost considerations the offset function has been incorporated into the duplexer instead of the printer engine Offsetting and duplex printing are otherwise unrelated to one another The offset motor in the duplexer generates the mechanical drive for offsetting paper n Overview Sheet Feeder 5 Sheet Feeder LES As with the LaserWriter 16 600 PS and LaserWriter 12 640 PS designs the sheet feeder fits squarely beneath the printer to form dual front loading cassette arrangement Unlike those models however you can stack two feeders Sheet Feeder beneath the printer for a total auxiliary capacity of 1000 sheets Also unlike those models the sheet feeder and the e
44. e on the photosensitive drum at the point where toner development takes places This charge can either be by design for example a black mask within an Illustrator document that is visible only in preview mode or because of a failure in the charging or exposure system First run the EPOST diagnostic If EPOST is inconclusive run a service test page If the symptom disappears the problem is likely with the I O board If the symptom persists the problem is not with the 1 0 board If the procedures above do not solve the problem replace the high voltage power supply m Troubleshooting Image Defects 20 3 Light Faded Image This condition is usually the result of inadequate charge to the imaging components First confirm that known good paper is being used and the density values have not been set incorrectly see Density Adjustment in the Overview chapter for the two methods of density adjustment If you have recently serviced the printer and this symptom has existed ever since the problem is almost certainly a loose connection Carefully inspect all connections especially connector TR going into the bottom of the high voltage power supply see High Voltage Power Supply in Take Apart for correct orientation of the connector If the problem continues to persist refer the symptom Blank Page or Light Printing in the Troubleshooting Addendum 12 quip Tro
45. ending only at the knees 1 Remove the cassettes from both the printer and the sheet feeder 2 Remove the two thumb screws that secure the uu lol Take Apart Sheet Feeder 146 Sheet Feeder printer to the sheet feeder and lift the printer off the feeder Note The thumbscrews are available as P N 922 3036 The procedures following this one describe take apart of feeder covers Other feeder take apart procedures are similar to what is described in the printer section m lol Take Apart Feeder Left Cover 147 Left Cover No preliminary steps are required before you begin this procedure Left Cover quip Feeder Left Cover 148 1 Remove the five screws that secure the left cover to the feeder chassis two on the side two on the rear and one inside through the cassette guide assembly 2 Remove the left cover Left Cover m lol Take Apart Feeder Right Cover 149 Right Cover No preliminary steps are required before you begin this procedure Right Cover quip Take Apart Feeder Right Cover 150 1 Remove the five screws that secure the right cover to the feeder chassis two on the side two on the rear and one inside through the cas sette guide assembly Right Cover 2 Remove the right cover m lol Take Apart Feeder Front Cover 151 Front Cover Beneath Plate Front Cover Before you beg
46. er Roller Cassette 922 2793 922 2777 L Paper Present Actuator 922 2776 Knob Print Density 922 2819 Feed Cassette Cassette Electro Paper Roller Guide M Feed Feed magnetic Handling Power Supply Lower Assy Right Pd Core Kit Gear Kit Pickup Clutch Gear Assy 110 V 922 3031 922 2792 922 2775 p d 076 0649 076 0700 922 2778 922 2779 922 2806 220 V 922 3032 22 sa Wm i Cassette Guide A deny Lt Cover Turn Chute 922 2772 Exploded View 3 Exploded View 3 of 3 Duplexer Stack Actuator 922 3038 Duplexer 922 3034 Duplexer Drive Belt 922 3044 30 Offset Assembly Delivery Tray seu Paper Weight 922 3040 Duplexer Duplexer Feed Roller Upper Paper Pass Sensor 922 3042 922 3037 Duplexer Feed Roller Lower 922 3043 Sheet Feeder 922 3035
47. eshooting Image Defects 29 Feed Direction 11 Repetitive Defects Repetitive defects along the direction of the paper path is almost always a result of dirty rollers Interrupt a print cycle midway and inspect the paper and drum If the symptom is present the problem is before the toner cartridge probably in the registration feed or pickup rollers If the symptom is not present the problem is within the fuser assembly m lol Troubleshooting Image Defects 30 12 Wrong Orientation The cassette automatically senses paper orientation The multipurpose tray does not If you want to print short edge feed C SEF from the multipurpose tray adjust the default setting in the printer utility m lol Troubleshooting Image Defects 31 13 No Duplexing If you have an optional duplexer installed but pages are all printed one sided first make sure that you have the correct printer driver installed and that you have selected two sided printing Refer to RAM Memory in the Overview chapter Printing in duplex mode requires a RAM upgrade depending on paper size and PhotoGrade support With insufficient RAM the pages will be automatically be printed in simplex mode quip 14 Ghosting Streaking Black Areas Image Defects 32 14 Black Page with Streaking or Ghosted Image of Same Area Further Down the Page This condition is usua
48. front to rear to accommodate different paper lengths It is in contact with the trailing edge of the paper stack When the paper end guide is adjusted the size cams on the left side of the cassette rotate into a unique pattern of projections and gaps When you insert the cassette the position of the cams align with actuators that are housed in the printer s left cassette guide assembly The actuators correspond to four microswitches on the cassette feed board Cassette Size Actuator Size Actuator Size Switch x Size Switch Cassette Feed Board Cassette Feed Board Cassette Latches On each side near the leading edge of the cassette are two cassette latches When the cassette is outside the printer these latches hold the bottom plate down against the force of the pressure plate springs As the cassette is inserted the latches release and the bottom plate elevates Bottom Plate Assembly Right Cassette Latch Cassette Bottom Plate Assembly Cassette Guide in Printer lol Basics Function of Main Components 3 Cassette Feed Components Turn Clutch Cassette Feed Solenoid Cassette Feeder Board and Feed Gear Cassette Paper Present Sensor and Actuator Cassette Feeder Board The feeder board has the paper size microswitches see previous topic and serves as a relay board for the signals between t
49. gt lol Troubleshooting Flowchart 6 14 Flowchart 6 Symptom The paper out light illuminates steadily on printer startup This display is consistent with a cassette absent or a cassette empty condition The cassette paper present sensor monitors the presence of paper and the cassette size microswitches monitor the presence of the cassette Remove the cassette from the printer With one hand reach in and press the paper present actuator up to simulate the presence of paper With your other hand press any one of the four microswitch actuators at the left front edge of the opening i Now does the ready light illuminuate Yes The problem is likely with the cassette Either the bottom plate is not elevating when you insert the cassette or there is something wrong with the cam actuators on the side of the cassette See Cassette in Basics for a description of the relevant parts Have you recently serviced the printer and has this symptom existed ever since Yes The problem is likely with a loose connection Check P J 20 on the DC controller board the cables going into the cassette feeder board and the cable going into the cassette paper present sensor The problem might be a result of damage to the paper present actuator or the microswitch actuators Perform take apart to the point where you can physically inspect these parts If there is no p
50. h the thickness when exposed to light Bias charge roller BCR Places a uniform electrical charge on the drum surface erasing any charging patterns remaining from the previous cycle Magnetic roller Holds a thin layer of toner on its surface and transports it to the gap between the drum and the magnet roller Toner is supplied to the magnetic roller by two agitators inside the toner compartment Charging and metering CM blade Spreads a thin layer of toner on the magnetic roll and gives toner a negative charge Cleaning blade Scrapes the toner off the drum surface that is remaining after the transfer stage Laser Scanner Assembly Laser Diode Assembly m T SOS Board OL Photosensitive Drum Front Scanner Mirror L Lens M Mirror SOS Start of Scan The laser scanner assembly scans a light beam onto the surface of the photosensitive drum This assembly consists of three major components the laser diode the scanning mirror and the start of scan SOS board lol Basics Function of Main Components 12 Electrical Fuser Access Cover Actuator Top Cover 9 xS Fuser Cover Top Cover Interlock Switch Interlock Switch Actuator Top Cover Interlock Switch The top cover interlock switch is a safety switch that interrupts the supply of 24 VDC from the power supply to the DC controller board whenever the top cover is open This switch also causes the power supply to interrupt AC
51. he cassette feed and the DC controller board Cassette Paper Present Sensor and Actuator This sensor detects the presence of paper in the cassette Cassette Feed Solenoid and Feed Gear When the feed solenoid is actuated the feed gear is releases and turns to engage with the feed idler gear The feed gear then begins to rotate causing the pickup rollers to rotate After one revolution the feed gear disengages from the feed idler gear and is latched by the pawl of the feed solenoid Turn Clutch The turn clutch is an electromagnetic clutch that switches on and off the drive power to the lower and upper feed rollers Lower and Upper Feed Rollers These rollers have an integral metal shaft rubber roller design Drive to the rollers is controlled by the turn clutch so that the rollers start feeding from the pickup area and stop feeding at the registration sensor When the engine receives a PRFD signal from the controller the engine stops feeding at the registration sensor and resumes when it receives a subsequent START signal If the START signal is received before the paper reaches the registration position the printer will feed the paper continuously without stopping the rotation of the feed rollers Pickup Rollers Rotate and feeds one sheet of paper each time the cassette feed solenoid is actuated lol Basics Function of Main Components 4 Manual Feed Components Toner Sensor mS Manual Feed Sensor A
52. he chart on the following page notes where this is important quip Troubleshooting PostScript ReportingEnd User Error Codes 5 End User Error Codes gt 2 3 c lt Description Explanation I1 8 Ready LED on Printer is ready after approx 50 seconds E O Ow Ready LED flashes Printer is warming up or processing a job 1 Mo e Ready LED flashes O rn int of 2 2 shades of green Point of sale POS mode E oO mY Paper Out and An error has been detected in POST Observation Paper Jam LEDs of LED behavior prior to this array can isolate the Do flash alternately fault to one of three general areas see POST O All LEDs off The top cover or fuser access cover is open Oo Paper Out LED E o fed illuminates solidly No paper or cassette is not installed Lo m Paper Out LED EH i i B flashes Printer is ready for sheet of manual feed paper O o Paper Jam LED Oo 5 T illuminates solidly Paper is jammed in printer O o mw op Toner LED EF d illuminates solidly Toner level is getting low O o Ej 5 Toner LED E lashes Toner cartridge is not installed Oo Possible faulty cartridge sensor 922 2811 N If the Ready LED flashes forever turn off the printer disconnect it from the network and restart the printer If the flashing does not recur the problem is most likely with net
53. hing Toner Paper Jam and Paper Out LEDs 40 Flashing Toner Paper Jam and Paper Out LEDs The errors conditions listed below are most frequently reported when an actuator on the toner cartridge fails to make proper contact with the sensor that detects the presence of the toner cartridge When this condition occurs the best solution is to replace the cartridge sensor 922 2811 Error conditions e Flashing low toner LED indicating no toner cartridge is present e Flashing paper jam and paper out LEDs U2 ROS unit failure error reported To solve the problem 1 Locate the toner cartridge sensor Toner Cartridge Sensor ui oi Troubleshooting Flashing Toner Paper Jam and Paper Out LEDs 41 2 Remove the cartridge sensor assembly from the printer Refer to the Take Apart chapter in this manual to remove the part Cartridge Sensar Assembly ui ol Troubleshooting Flashing Toner Paper Jam and Paper Out LEDs 42 3 Look at the bottom of the cartridge sensor Does the sensor have ridges like those in the graphic below If there are no ridges present replace the cartridge sensor 922 2811 The cartridge sensor provided by service has been modified slightly to eliminate this symptom problem Bottom af Cartridge Sensor Assemb thr This information is also referenced in TIL article 24712 lt i gt Troubleshooting Paper Slides Back into the Exit Cover 43 Paper Slides Back into the Exit Cover
54. his adjusts the density of the printed pixels m Service Source Basics LaserWriter 8500 m Basics Function of Main Components 1 Function of Main Components This topic describes the function of the following components of the LaserWriter 8500 eCassette eCassette Feed Components eManual Feed Components ePaper Transportation eFusing and Paper Exit eFrame and Drive eTop Cover and Xerographics eElectrical Cassette Paper Width Guides The paper width guides are adjusted left to right to accommodate different paper widths They contact the left and right sides of the paper stack and hold the paper stack in place in the crosswise direction The left and right snubbers paper separating claws at the leading edge of paper allow only one sheet of paper to be fed from the cassette into the printer The snubbers move together with the paper width guides Pressure Plate Springs Two pressure springs act against the bottom plate when paper width is less than 8 5 inches 216 mm When the paper width is greater additional forced is deemed necessary and a third pressure spring is released against the bottom plate The mechanism that releases or contains the third spring is controlled by the paper width guides Bottom Plate Assembly Left Width Guide Pressure Plate Springs Paper End Guide Basics Function of Main Components 2 Paper End Guide The paper end guide can be adjusted
55. hysical damage there might be failure in the sensing system probably within one of the following parts Cassette feeder board P N 922 2770 Left cassette guide assembly P N 922 2773 ui lol Troubleshooting Flowchart 7 15 Flowchart 7 Yes A flashing toner light normally means that there is no cartridge installed The presence of the toner cartridge is sensed by the cartridge sensor assembly located in the top cover When you close the top cover an actuator in this assembly presses against a small tab on the top of the toner cartridge Check that this tab is intact and that the sensor assembly has not been damaged If you have recently serviced the printer and this symptom has existed ever since the problem is likely a loose connection at the sensor or at P J 17 on the DC controller board If connections are good and mechanical elements are intact the problem is likely within the cartridge sensor assembly P N 922 2811 Symptom The toner light illuminates on printer startup A steady toner light normally means that the toner level is low The level of toner is sensed magnetically by the toner sensor assembly which is the black sensor that is part of the manual feed sensor assembly If you have recently serviced the printer and this symptom has existed ever since the problem is likely a loose connection at P J 22 on the DC controller board or at the intermdiate coupli
56. in remove the following e Left cover e Right cover quip Feeder Front Cover 152 Remove the three screws along the top that secure the front cover to the feeder chassis Press and release the two bosses slide the cover forward and remove the cover from the feeder Front Cover m Take Apart Duplexer 153 Paper Weight Duplexer Printer Duplexer This procedure describes how to separate the duplexer and printer The procedures following this one describe duplexer take apart 1 Disconnect the duplex interface cable going into the back of the printer 2 Remove the paper weight from the front of the duplexer 3 Loosen the two captive knurled screws that secure the duplexer to ui Take Apart Duplexer 154 the printer 4 Remove the duplexer from the printer and set the YES duplexer flat metal side up on the work surface WARNING Never set the duplexer face down Placing the duplexer in this manner may damage the full stack actuator The duplexer full stack actuator is available as P N 922 3038 Full Stack Actuator m lol Take Apart Duplexer Left Cover 155 Left Cover Before you begin remove the duplexer from the printer Left Cover quip Take Apart Duplexer Left Cover 156 Left Cover 1 1 Loosen the two screws that secu
57. is test plug is colored bright green to differentiate it from an older version black plug Do not use the black plug on the LaserWriter 8500 It won t harm anything it just won t work Switch off the printer and install the test plug into the LocalTalk port on the back of the 1 0 controller board Switch the printer back on m lol Troubleshooting Flowchart 1 Starting Point 9 Flowchart 1 Starting Point Establish a basic configuration by performing the following tasks Remove optional duplexer and sheet feeder s if present Make sure the cassette has paper and is inserted fully into the printer Install a known good toner cartridge Close all the covers plug in the printer and switch on power Make sure that the startup page is turned on in the Printer Utility Power Check 1 Does the fan come on when you switch on power Go to Flowchart 2 1 Power Check 2 Do the delivery rollers rotate Go to Flowchart 3 T The ready light does not illuminate steadily If no lights illuminate go to Flowchart 4 If the jam light illuminates go to Flowchart 5 If the paper out light illuminates go to Flowchart 6 If the toner light illuminates go to Flowchart 7 If the jam and paper out lights flash go to Running EPOST in the Troubleshooting chapter Does the printer come ready 1 Transportation Check Does the printer deliver a s
58. left corner of the board lol Take Apart DC Controller Board 42 5 Remove the controller board and holder from the printer 7 ae i MN HL f Removing Board and Holder lt H p e Take Apart Fan 43 Fan Before you begin remove the following e Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Remove the two lower screws that secure the fan to the chassis e Take Apart Fan 44 2 Disconnect the fan cable LOrE from P J122 on the A E power supply 3 Open the cable clamp near the density dial and the ferrite core near the fan pull the fan cable free and remove the fan from the printer Cable Clamp P J122 e Take Apart Power Inlet Power Supply Power Supply 45 Power Supply Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Left lower cover 1 0 board Note The main power receptacle and switch also known as the power inlet is hard wired to the power supply e Take Apart Screws Power Inlet Holder Power Supply 46 Remove the screw securing the grounding wire to the chassis Remove the three screws securing the power inlet holder and lift the holder up from the chassis Remove the power cable from the two clamps e Take Apart Power Supply 47 Remove the two brass
59. line voltage to the fuser assembly The switch is located inside the left cartridge guide and is actuated by the nylon tip at the end of the laser scanner actuator rod Fuser Cover Interlock Switch A safety switch that stops operation of the main motor the laser scanner assembly and the fuser whenever the fuser access cover is open The switch is located on the right side of the fuser access cover opening Fan High Voltage Power Supply DC Controller Board Print Density Adjustment Knob Service Access Side Power Supply Fan The fan exhausts the air inside the printer to prevent an excessive heat caused by the fuser assembly There is one fan in the LaserWriter 8500 Power Supply The power supply produces regulated low DC voltages from AC power The power supply also switches on and off the AC power to the fuser heater bulb The main power switch is hard wired to the power supply High Voltage Power Supply The high voltage power supply produces high voltage power for the charge and magnetic roller in the toner cartridge the transfer roller and the detack saw Basics Function of Main Components 13 DC Controller Board The DC controller board controls all printer operations It has the following six major functions 1 Communicates with the 1 0 board 2 Communicates with the optional duplexer 3 Receives information from the printer sensors and switches 4 Controls the laser scanner fuse
60. llers lol Troubleshooting Flowchart 3 11 Flowchart 3 Does the problem still exist Return to in Flowchart 1 Check to make sure that all the covers are closed and that a toner cartridge is installed Visually inspect the fuser idler gear and fuser guide lever to confirm the integrity of the drive train see main gear assembly see Frame and Drive in Basics If the problem persists return to Q in Flowchart 1 lt gt lol Troubleshooting Flowchart 4 12 Flowchart 4 Symptom No status panel lights illuminate This display is consistent with a cover open condition In a standard configuration the fuser cover interlock switch and top cover interlock switch are the two switches that sense cover open conditions L Make sure you have done the following Connected the I O board to status panel cable Yes Connected the two pin cable going into the top of the duplex interface board If you have serviced in the area of the two switches make sure that those connections and actuators are also intact making special note of J21 on the DC controller board Have you recently serviced the printer and has this symptom existed ever since Does the printer perform adequately in all other ways Replace the status panel or connecting cable Make sure that the two covers are fully closed Check the plasti
61. lly associated with a brand new toner cartridge Refer to TIL article 24286 for more information There are two controls for print density associated with the LaserWriter 8500 which measure the voltage applied to the toner cartridge s photoconductor You will need to lower the print density in order to avoid the ghosting streaking The first control is a hardware dial located inside of the printer Lift the front hood and look on the left inside the printer for a dial marked with a cresendo symbol Turning the dial towards the outside of the printing will lower the print density and turn down the voltage The other control is located in the Apple Printer Utility Connect to the printer using the utility and locate the slider for Print quip lol Troubleshooting Image Defects 33 Density Adjust the density down by sliding the control to the left After adjusting the slider send the changes to the printer by clicking the Send button at the top of the window m Troubleshooting Troubleshooting Addendum 12 99 34 Troubleshooting Addendum 12 99 The following topics have been identified as troubleshooting issues for the LaserWriter 8500 printer This addendum describes the issues and instructs the service provider on how to solve the problem quip oi Troubleshooting Blank Page or Light Printing 35 Blank Page or Light Printing A blank page or light printing could be caused by bent or damaged toner con
62. lopes is also available Paper Type U S Letter LEF U S Letter Small LEF Statement LEF Executive LEF A4 LEF A4 Small LEF 5 5 LEF U S Letter LEF U S Letter Small LEF A4 LEF A4 Small LEF 5 Executive LEF Size 8 5 x 11 215 9 mm x 279 4 mm 8 5 x 11 215 9 mm x 279 4 mm 8 48 x 5 48 215 9 mm x 139 7 mm 10 5 x 7 25 266 7 mm x 184 2 mm 8 27 x 11 69 210 mm x 297 mm 8 27 x 11 69 210 mm x 297 mm 5 84 x 8 26 148 mm x 210 mm 7 17 x 10 12 182 mm x 257 mm Size 8 5 x 11 215 9 mm x 279 4 mm 8 5 x 11 215 9 mm x 279 4 mm 8 27 x 11 69 210 mm x 297 mm 8 27 x 11 69 210 mm x 297 mm 5 84 x 8 26 148 mm x 210 mm 10 5 x 7 25 266 7 mm x 184 2 mm n Printing Materials 9 Optional 500 sheet A3 cassette 5 LEF Statement LEF U S Legal SEF U S Legal Small SEF Tabloid SEF A3 SEF Large SEF Large SEF Large SEF COM10 SEF Monarch SEF DL SEF C5 SEF Hagaki Postcard SEF Paper Type Size U S Letter LEF U S Letter Small LEF Statement LEF Executive LEF 7 17 x 10 12 182 mm x 257 mm 8 48 x 5 48 215 9 mm x 139 7 mm 8 5 x 14 215 9 mm x 355 6 mm 8 5 x 14 215 9 mm x 355 6 mm 11 x 17 279 4 mm x 431 8 mm 11 69 x 16 54 297 mm x 420 2 mm 13 x 18 330 mm x 457 2 mm 13 x 18 5 330 mm x 470 mm 13 x 20 330 mm x 508 mm 4
63. lowing Fuser access cover Left top cover Left cover assembly Front left cover Right top cover Right cover Exit cover Top cover Front cover Fuser assembly 1 0 board L Transport Chute Assembly ui Manual Feed Pickup Roller Assembly 127 9 ickup Gear Pickup Spring Manual Feed Pickup Roller Assembly Duplex interface board DC controller board Manual feed sensor assembly Transfer roller Top cover housing Transport chute assembly Remove the pickup spring that goes from the pickup gear to the frame of the transport chute assembly Release the hook and slide the pickup gear from the shaft Rotate the pickup rollers so that their rubber ui Take Apart Manual Feed Pickup Roller Assembly 128 surfaces are face down 4 Lift the left end of the pickup roller assembly and remove its left end from the transport chute assembly 5 Slide the pickup roller assembly to the left and remove its right end from the bearing iS cy Manual Feed Pickup Roller Assembly ickup Gear Pickup Spring lt H p all Take Apart Left Cartridge Guide Assembly 129 Left Cartridge Guide Assembly Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Right cover Front left cover Front cover Transfer roller 1 0 board Left Cartridge Guide Assembly oO Tak
64. ly Manual Feed Paper Present Actuator Inside Manual Feed Sensor Assembly Take Apart Manual Feed Paper Present Actuator 101 Paper Present Actuator 1 Actuator Holder Bracket of Manual Feed Sensor Assembly Disconnect the cable going into the manual feed paper present sensor and free the cable from the clamp Remove the brass colored screw securing the black actuator holder to the assembly bracket Release the two hooks and remove the actuator holder from the bracket Carefully press the end of the actuator out of its C grip and remove the actuator from the holder mn all Take Apart Toner Sensor Assembly 102 Toner Sensor Assembly Before you begin remove the manual feed sensor assembly Toner Sensor Assembly Take Apart Toner Sensor Assembly 103 1 Release the hooks on the back side of the toner sensor assembly and hold the assembly away from the bracket Toner Sensor Assembly 2 Remove the toner sensor cable from the cutout at the end of the bracket and lift the assembly free oa racket of Manual Feed Sensor Assembly 4 B gt all Take Apart Transfer Roller Assembly 104 Transfer Roller Assembly No preliminary steps are required before you begin this procedure 1 Open the manual feed cover and top cover Transfer Roller Assembly Take Apart Transfer Roller Assembly 105 A _ Transfer Roller Assembly SE
65. m the clamps and remove the laser scanner assembly m lol Take Apart Cartridge Sensor Assembly 93 Cartridge Sensor Assembly L Top Cover Housing _ Cartridge Sensor Assembly Fuser access cover Left top cover Right top cover Left cover assembly Exit cover Top cover Fuser assembly 1 0 board Top cover housing Place the top cover housing on the work surface so that the laser scanner faces up ui Take Apart Cartridge Sensor Assembly 94 Cartridge Sensor Assembly 2 Release the cartridge SEIEN sensor assembly cable from the clamp 3 Remove the four screws securing the cartridge sensor assembly to the metal housing 4 Remove the cartridge sensor assembly o Take Apart Manual Feed Sensor Assembly 95 Manual Feed Sensor Assembly No preliminary steps are required before you begin this procedure 1 Open the manual feed cover and top cover and keep them open while you perform the steps below 2 Remove the two screws securing the assembly to the printer frame one at each end facing outwards Screw Screw Manual Feed Sensor Assembly Manual Feed Sensor Assembly 96 3 Press down the manual feed guide tray and slide the manual feed sensor assembly toward you to release the two hooks at each end of the assembly Manual Feed 4 Raise the right end of the Sensor Assembly sensor assembly and slide it slightly to the
66. make these settings through the Printer Utility During POS state the ready LED flashes two shades of green instead of the normal steady green When you press the ready LED thereafter a special demonstration page will print While in POS state the energy saving feature is lt p Miscellaneous 16 disabled but in all other ways the printer is network aware and will perform just as it does in ready state Voltage Specific Parts Four parts in the printer are available in both 110V and 220V versions Power supply Fuser assembly Transport chute assembly DC controller board Note The DC controller board though universal in previous printers is not in the LaserWriter 8500 The second version of this board satisfies European Economic Community requirements and has made possible some localization of controller board firmware default paper size for the multipurpose tray for example ui ej Overview Miscellaneous 17 Density Adjustment Dial Density Adjustment On the left side of the multipurpose tray compartment there is a density adjustment dial This dial changes the DC component of the development bias voltage supplied by the high voltage power supply The dial adjusts the threshold voltage in effect changing the background density across the entire imageable page A second method of density adjustment is through the Apple Printer Utility which adjusts the laser power output In effect t
67. n Must have a 2 KB row 11 bit x 11 bit refresh rate 16 MB SIMMs with a 4 KB row 12 bit x 10 bit refresh rate are not compatible with the printer m Miscellaneous 14 Actuator for Full Stack Sensor Miscellaneous Full Stack Sensor When the delivery tray is full of paper the printer stops accepting print jobs and the controller reports an error message to the host computer Sensing of delivery tray capacity is done through the full stack sensor located just above the delivery rollers With a duplexer installed the duplexer full stack sensor assumes this function The parts used in the duplexer actuator and the printer actuator are not interchangeable Other Sensors and Interlocks All other sensors and interlocks are similar to previous printers and will be familiar to the experienced technician See Sensing System Locator in the Basics chapter for a quip Miscellaneous 15 Demonstration Page comprehensive diagram There is also a mechanical interlock that disengages the fuser assembly drive train when the top cover is open to facilitate removal of paper jams See Top Housing and Xerographics in the Basics chapter Point of Sale POS Button The Ready LED is also a button that actuates a microswitch on the status panel board If you hold this LED during printer startup the printer will enter the special POS state or exit from POS if POS is currently enabled You can also
68. n the power supply and J21 on the DC controller board single orange wires and release the cable from the intermediate clamps With the top cover propped open remove the screw securing the interlock switch to the chassis Pull the interlock cable through the cutout in the chassis and remove the interlock switch from the printer ui Take Apart Fuser Cover Interlock Switch 139 Fuser Assembly Fuser Cover Interlock Switch Fuser Cover Interlock Switch Before you begin remove the following e Fuser access cover e Left top cover quip ej Take Apart Fuser Cover Interlock Switch 140 _ z 1 Remove the two screws that secure the fan to the chassis and lift the fan Clear so that it hangs loosely from its cable Fan Duct Fan 2 Remove the two screws that secure the fan duct to the chassis and remove the duct from the printer Screws o Take Apart Fuser Cover Interlock Switch 141 3 Press the tabs on the top and bottom of the switch and pull the switch outward from the switch shield Cable Connector Note The cable connector going into the switch has four copper leads and will offer some resistance when performing the following step 4 Pry the switch from the cable connector and remove the switch from the printer Switch Tabs e Take Apart Main Gear Assembly Inside Chassis Wall Main Gear Assembly 142 Main Gear Assembly
69. ner actuator rod presses the switch Switch P N 922 2812 Paper Size Sensing Actuators As cassette is inserted size cams on cassette meet four size actuators on left cassette guide assembly P N 922 2773 Switches Size actuators press microswitches on the cassette feeder board P N 922 2770 Cassette Paper Present Sensing Actuator P N 922 2776 Sensor P N 922 2774 Basics Sensing System Locator Duplexer 15 Sensing System Locator Duplexer Full Stack Sensor Full Stack Actuator P N 922 3038 Duplex Paper Pass Sensor P N 922 3037 Duplexer Full Duplexer Full Stack Sensor Stack Actuator Upper Cover Interlock Switch 2 d Upper Cover Duplexer Lower Cover O EE at Zl Lower Cover Interlock Switch Basics Wiring Diagram 16 Wiring Diagram Layout of sheet feeder is identical to cassette feeder board HL gu Paper Pass Sensor Laser Scanner Full Stack 4 Sensor Interlock Duplex x Offset Switches Motor o Toner 112 113 t14 Cartridge P J12 DB CR DTS TR Sheet Feeder P J184 m PU Duplexer Board
70. ng on the circuit leading out to the toner sensor If connections are good the problem is likely with the toner sensor assembly P N 922 2799 which is also available as part of the manual feed sensor assembly P N 922 2796 ui lol Troubleshooting Flowchart 8 16 Flowchart 8 Symptom Printer comes ready but does not deliver a startup page Did the pickup rollers rotate i e in an attempt to pick up paper Run a service test page Is paper jammed in the printer The problem is likely mechanical either with a misaligned or damaged pickup roller or a faulty cassette Yes Double check to see that you have turned on the startup page in the Printer Utility If problem persists replace the I O board Does pickup occur If the printer comes ready but does not respond to a print request for a service test page the problem is not with the I O board If further testing shows that a host computer can print from the multipurpose tray the problem is also not with the DC controller board Check for loose connections especially at P J 20 on the DC controller board and at the cables leading into the cassette feeder board If the problem persists the problem could be in the cassette feed solenoid or cassette feeder board Check for loose connections at the turn at the registration clutches If unusual grinding sounds are occurring yo
71. ngine use identical cassettes in the LaserWriter 8500 The sheet feeder derives its power and mechanical drive from the printer engine quip Form Factor 6 Printer Cross Section Note Diagram shows printer with long cassette and over size 11 x 17 inch or A3 paper installed Form Factor To achieve a reasonably compact form factor the tail end of the cassette has been designed to extend out from the engine footprint A Consequently the pickup rollers feed from the insertion end of the cassette B similar to the Laser Writer Il This arrangement influences the architecture of the printer in the following ways 1 Because pickup occurs deep within the printer all mechanical drive elements are arranged vertically along the rear C resulting in a simple C shaped paper path This vertical arrangement yields a compact low maintenance gear train consisting at its essence of one gear assembly driven by one central motor 2 You can stack letter sized paper on the multipurpose tray and shut the cover D thus hiding that paper from view inside a multipurpose compartment ui Form Factor 7 The design of the cassette bottom plate A is new Below the plate three springs provide upward pressure that forces the paper against the pickup rollers Only two of the springs are activated when the width guides B are set for narrower paper In most printers the bottom plate receives const
72. of the center core roller some units may have only a flex tab and slide the roller to the right away from the separation pad Note There are notches in the core roller that allow it to pass over the shaft drive pins Press the separation pad to the front and pull its rear side up to release the hooks on its rear side from the transport chute assembly lt gt lol Take Apart Separation Pad Assembly 115 5 Hold the separation pad at a right angle and ensure that the two springs stay attached 4 6 Remove the separation pad and the two springs Note The separation pad and springs are available as a kit P N 076 0651 m lol Take Apart Registration Sensor Assembly 116 Registration Sensor Assembly Transport Chute Assembly Before you begin remove the following Fuser access cover Left top cover Right top cover Left cover assembly Exit cover Top cover Fuser assembly 1 0 board Top cover housing Registration Sensor Assembly Inside Transport Chute Assembly 4 I Take Apart Registration Sensor Assembly 117 1 Remove the eight screws that secure the rear tie plate to the printer chassis Disconnect the cable from the registration sensor Remove the one screw securing the sensor bracket to the transport chute assembly and remove the bracket together with sensor and actuator Note The registration sensor assembly is available as P N 076 0
73. oller with the hole in the shaft and press the pickup roller onto the shaft m all Take Apart Cassette Pickup Solenoid Cassette Pickup Solenoid 76 Cassette Pickup Solenoid Before you begin remove the following e Fuser access cover e Left top cover e Left cover assembly e Front left cover e O board Cassette Pickup Solenoid 77 Chassis Armature Cassette Pickup Solenoid 1 Remove the spring that connects the feed core to the chassis armature Note This spring is a part of the spring kit P N 076 0647 Disconnect solenoid cable J204 from the left cassette guide assembly Remove the screw securing the cassette pickup solenoid to the chassis armature and remove the solenoid from the printer m lol Take Apart Lower Feed Roller 78 Lower Feed Roller Lower Feed Roller Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Right top cover Right cover Turn in chute Turn chute cover 1 0 board Turn clutch quip Lower Feed Roller 79 Lower Feed Roller Bearing Gear E Ring On the gear end of the roller remove the E ring securing the gear and slide the gear off the lower feed roller shaft Slide the feed bearing off the roller shaft On the right side remove the E ring securing the feed bearing and slide the bearing off the
74. ore you begin remove the following 1 Fuser access cover Left top cover Left cover assembly Front left cover Turn in chute 1 0 board Swing the arm of the cassette paper present actuator to the rear direction so that the actuator is away from the cassette paper quip Cassette Paper Present Sensor 69 present sensor Open the turn chute cover Use a small flat blade screwdriver to release the hooks of the cassette paper present sensor located on the inside of the printer frame work from the rear of the printer from the left cassette guide assembly Note Do not move the cassette paper present sensor away since it is connected with the feeder harness Disconnect P J205 from the sensor Remove the sensor m Io Take Apart Right Cassette Guide Assembly 70 Right Cassette Guide Assembly Before you begin remove the following e Fuser access cover Right top cover Right cover Turn in chute e e e e Turn chute cover Right Cassette Guide Assembly Ig Apart Right Cassette Guide Assembly 71 d Right Cassette Guide Assembly 1 Remove the three screws securing the right cassette guide assembly Press the three tabs at the bottom of the cassette guide and release them from the printer frame Tilt the cassette guide pulling its bottom edge from the inside of the printer frame Release the three upper hooks of the casset
75. osition of the reset button on the 1 0 bracket 2 Disconnect the two cables at the right side the board 1 0 Board with Shield quip lol Take Apart 1 0 Board 30 4 ZEE Remove the eleven silver colored screws that secure the I O shield to the chassis 1 2 on the left 3 below the fan 4 7 at the top 8 9 and 11 on the right and 10 at the bottom Pull the controller board with the intact shield from the printer Note There may be some resistance from the receptacle connector on the blind side of the board near the top just left of center ui I O Board 31 lol Take Apart 1 0 Bracket 1 0 Board Screw Step 5 Connector Screws Note Peform the following steps only if you are replac ing a defective 1 0 board 5 Remove the screw at the bottom left corner of the 1 0 board Remove the two screws and the six small 1 0 connector screws that secure the I O bracket to the shield Remove the 1 0 bracket Remove the four remaining screws step five removed the fifth that secure the I O board quip 1 0 Board 32 lol Take Apart Receptacle Connector Metal Tabs Backside of I O Shield to the shield Remove the board being careful to elevate the receptacle on the rear to clear the plate Replacement Notes When replacing the I O bracket make sure that the three metal tabs slide in the cut
76. outs in the shield Check the position of the reset button on the 1 0 bracket and restore the setting if you have accidently changed it during this procedure mp all Take Apart Cassette Feeder Board Cassette Feeder Board 33 Cassette Feeder Board Before you begin remove the following e Left top cover Left cover assembly Front left cover Left lower cover 1 0 board all Take Apart Cassette Feeder Board 34 Cassette Feeder Board 1 Disconnect the cable Screw Screw going into the left side of 7 the board 2 Remove the four screws securing the cassette feeder board Ke hARRRARASI Note To loosen the bottom left screw insert the screwdriver through the opening in the printer frame even cn Y 5 v e 7 DN 3 gar thew AA os 7 3 Vy ZI My ilk A LED all Take Apart Cassette Feeder Board 35 3 Lift the board away Disconnect Cables from the printer and disconnect the two remaining cables 4 Remove the cassette feeder board from the printer all Take Apart Duplex Interface Board Duplex Interface Board 36 Duplex Interface Board Before you begin remove the following e Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board all Take Apart Duplex Interface Board 37 1 Disconnect the cable on Screws the rear face of the E board 2 Remove the two screws that secure the connector
77. r To Duplexer Exchange Chute Fuser Assembly Pressure Roller I Heat Roller Fingers These fingers work in conjunction the non stick coating of the heat roller to peel the leading edge of the paper from the roller Exit Sensor The exit sensor detects the arrival and departure of the paper on the delivery side of the heat roller Full Stack Sensor The full stack sensor detects when the delivery tray is full of paper Exchange Chute The installation of an optional duplexer locks the exchange chute into a position so that all paper is directed up into the duplexer er Basics Function of Main Components 9 Frame and Drive Registration Clutch Assembly Main Gear Assembly Main Motor Generates all the drive power for the printer and optional sheet feeder Main Gear Assembly Distributes drive power from the main motor to the fuser assembly toner cartridge paper handling gear assembly registration clutch assembly and pickup gear Paper Handling Gear Assembly Transfers the drive power from the main gear assembly to the feed idler gear and to a second gear within the main gear assembly Registration Clutch Assembly An electromagnetic clutch that switches the drive power on and off to the two registration rollers at a specified time after the registration sensor has detected the arrival of the paper This clutch actuates momentarily after the paper arrives at the registration rollers to allow the fee
78. r and main motor 5 Controls the printing process 6 Distributes DC power from the power supply to other printer components Print Density Adjustment Knob This knob adjusts the print density by changing the DC component of the developing bias voltage supplied by the high voltage power supply Turning this knob clockwise increases the print density Turning this knob counterclockwise decreases the print density Print Density Adjustment Knob User Accessible Side Basics Sensing System Locator Printer Engine 14 Sensing System Locator Printer Engine Cartridge Sensing and Laser Scanner Interlock Sensor Cartridge Sensor Assembly P N 922 2811 Actuator As the top cover closes a tab on the toner cartridge presses an actuator in the cartridge sensor assembly Fuser Assembly Full Stack Sensing A Sensor Part of Fuser Assembly Actuator P N 076 0653 Exit Sensing B Sensor Actuator Part of Fuser Assembly Transport Chute Assembly Registration Sensing C Sensor Actuator P N 076 0652 Manual Feed Sensor Assembly Toner Sensing D Toner Sensor Assembly P N 922 2799 Manual Feed Paper Present Sensing E Sensor P N 922 2774 Acutator P N 922 2798 Fuser Cover Interlock Actuator As the fuser access cover P N 922 2757 closes a tab on the cover presses the switch Switch P N 922 2813 Top Cover Interlock Actuator As the top cover closes the nylon tip of the laser scan
79. r cartridge These tables assume that you have confirmed that the toner cartridge is good 1 2 3 4 All Blank Page All Black Page Light Faded Image Dark Image Background E i i age X1 Ps E Acme tale E 5 6 7 8 Black Vert Lines White Vert Lines Black Horiz LInes Skewing with Feed with Feed Against Feed E gt L E 9 10 11 12 Bad Fusing Blank Sports Repetitive Defects Wrong Orientation 13 14 No Duplexing Ghosting Streaking Black Areas ui lol Troubleshooting Image Defects 18 1 All Blank Page This condition suggests that the laser beam is not striking the photosensitive drum Check for physical obstructions especially sealing tape that has not been removed from the cartridge or something else just outside the laser scanner assembly If this condition occurs only with a certain print job make sure that some user defined parameter such as magnification is not unintentionally placing the entire image off the area of the page If the problem persists refer the symptom Blank Page or Light Printing in the Troubleshooting Addendum 12 99 section later in this chapter quip Troubleshooting Image Defects 19 2 All Black Page This condition is the result of a uniform charg
80. re the cover to the duplexer 2 Place the duplexer on a flat surface left side up 3 Release the hook and slip the cover off the duplexer m lol Take Apart Duplexer Right Cover 157 Right Cover Before you begin remove the duplexer from the printer Right Cover lt p Duplexer Right Cover 158 Right Cover 1 Loosen the two screws that secure the cover to the duplexer Place the duplexer on a flat surface right side up Open the lower cover Release the hook and slip the cover off the duplexer m lol Take Apart Duplexer Upper Cover 159 Upper Cover Upper Cover No preliminary steps are required before you begin this procedure up Duplexer Upper Cover 160 1 Hold the upper cover half way open 2 Remove the screw and let the strap hinge hang loose from the duplexer 3 Slide the cover to the left and release the right side hinge pin 4 Release the left hinge pin and remove the cover from the duplexer Replacement Note There are two hinge holes on each side of the framed opening Install this cover in the upper set of holes ui Duplexer lol Take Apart Duplexer Upper Cover 161 5 Perform the Taping The Paper Pass Actuator procedure if you have also removed the lower cover m lol Take Apart Duplexer Lower Cover 162 Lower Cover Lower Cover
81. ree all the wires and cables from the clamp on the gear assembly 3 Remove the three screws securing the gear assembly e Take Apart Paper Handling Gear Assembly 59 4 Gently pull the gear assembly out of the printer all Take Apart Registration Clutch Assembly 60 Registration Clutch Assembly Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board Duplex interface board DC controller board with holder e Paper handling gear assembly Registration Clutch Assembly e Take Apart Registration Clutch Assembly Registration Clutch Assembly 61 1 After removing the paper handling gear assembly you can freely lift the registration clutch assembly out of the printer e Take Apart Turn Clutch Turn Clutch 62 Turn Clutch Before you begin remove the following e Fuser access cover Left top cover Left cover assembly Front left cover 1 0 board e Take Apart Cable Armature and Teeth E Ring Turn Clutch 63 1 Disconnect the cable from the turn clutch 2 Remove the E ring securing the clutch and slide the clutch off the end of the feed roller shaft Replacement Note Orient the clutch so that the chassis armature slips between the two teeth at the edge of the clutch Io Take Apart Left Cassette Guide Assembly 64 Left Cassette Guide Assembly Before yo
82. ribed in the left top cover and right top cover topics lt p Top Cover 21 Remove the two screws securing the top cover to the housing one on the left and one on the right outer face of the cover Remove the temporary support and close the top cover Slide cover slightly forward and remove the cover from the frame m lol Take Apart Front Cover 22 Manual Feed Cover Assembly Front Cover Front Cover Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Right top cover Right cover Note The manual feed cover assembly and the front cover come off together quip Front Cover 23 1 Remove the two screws securing the front cover to the chassis 2 Lift out the manual feed cover assembly together with the front cover Note Perform step 3 only if you are replacing a damaged front cover or manual feed cover 3 Flex one arm of the front cover to release the hinge and separate the front cover from the manual feed cover Manual Feed Cover Assembly lt q H p Take Apart Turn In Chute 24 Turn In Chute No preliminary steps are required before you begin this procedure Turn In Chute 1 Hold open the turn chute cover 2 Flex the left side arm of the turn in chute and remove its hinge hole from the boss on the left cassette guide assembly 3 Remove the turn in
83. rmation ui Service Source Exploded View LaserWriter 8500 m Exploded View 1 Exploded View 1 of 3 Fuser Heater 110 V 922 2804 220 V 922 2820 Cover Exit 922 2765 Solenoid Manual Feed Pickup 922 2778 Cover Left Top 922 2758 Status Panel Assy 922 2767 Fuser Cover Interlock Switch 922 2813 Cover Assy Left Cover Cover Front Left Left Lower 922 2764 922 2762 Cover Assy Top 922 2766 Cover Fuser Acces 922 2757 Fuser Assy 110 V 661 1418 220 V 661 1423 Laser Scanner Assy 922 3093 Transfer Roller 922 2761 2 922 2800 Rubber Registration Roller 922 2803 Transport Chute Assy 110v 922 3033 220v 922 3091 Separation Pad Kit 076 0651 Manual Feed Sensor Assy 922 2796 58 Cover Right Top 922 2759 Cover Right 922 2763 oj Exploded View 2 Exploded View 2 of 3 Board I O Controller 661 1420 Cable to P S J18 922 3250 DC High i Top Cover Board Board Controller Board Voltage Main Gear Interlock Duplex Cassette Board DC Power Assy 1 Fan Switch Interface Feed Mount Controller Supply 922 2812 922 2817 922 2770 922 2816 922 3092 922 3094 232 1 6 AN se T ZEN Roller Pickup Upp
84. rt Chute Assembly Transport Chute Assembly Photosensitive Drum Detack Saw Toner Cartridge Pickup Roller Separation Pad Transfer Roller Registration Actuator Registration Sensor Rear Chute Assembly Rubber Registration Roller Metal Registration Roller Included in the transport chute assembly are the following components Pickup roller assembly Consists of two pickup rollers three core rollers pickup cams and the shaft It rotates one turn each time the manual feed pickup solenoid is actuated and feeds one sheet of paper from the manual feed compartment Pickup solenoid and pickup gear When the pickup solenoid is actuated the pickup gear is released and turned by the pulling force of the pickup spring to engage with the opposite gear in the main gear assembly The pickup gear then begins to rotate causing the pickup roller assembly to rotate After one revolution the pickup gear disengages from the opposite gear because of its sector shaped cutout and is latched by the pawl of the feed Basics Function of Main Components 6 solenoid Separation pad assembly Prevents extra sheets of paper from being fed by the friction between the paper and the rubber of the separation pad Rear chute assembly Guides the paper fed from the cassette between the metal and rubber registration rollers Metal registration roller and rubber registration roller The rotation of these rollers is controlled by
85. se the two tabs at ae the top of the front left C8 cover and remove the d B cover from the printer frame Front AL O 4 m gt Left Lower Cover Left Lower Cover 11 Left Lower Cover Before you begin remove the left cover assembly Take Apart Left Lower Cover 12 1 Remove the two screws securing the left lower cover and remove the cover from the printer frame Left Lower Cover m sl Take Apart Right Top Cover 13 Right Top Cover 0 Before you begin remove Right Top Cover the fuser access cover Take Apart Right Top Cover 14 Right Top Cover SD Open the manual feed tray and the top cover Remove the two screws securing the right top cover to the printer frame one along the rear and one inside the manual feed compart ment Lift the cover straight up and off the printer quip lol Take Apart Right Top Cover 15 Caution With the left or right top covers removed fingers are no longer fully protected from the closure of the top cover Whenever possible keep the top cover closed If you must work with the top cover open however first make sure that it is all the way up in the latched position In addition place a temporary support a piece of folded cardboard cloth newspaper etc in the space beneath the side flange of the top cover Temporary Support For Top
86. ssembly Manual Feed Paper Present Sensor Manual Feed Guide Tray Manual Feed Guide Tray The manual feed guide tray is the pressure plate and width guide for manual feed paper During standby the tray is held down by the pickup roller assembly cams When the paper is about to feed the cams move off the tray due to the rotation of the pickup roller assembly The manual feed guide tray is therefore pressed up by the two pressure springs and the paper is pressed against the pickup roller Manual Feed Paper Present Sensor Part of the manual feed sensor assembly this sensor detects the presence of paper in the manual feed compartment Toner Sensor Also part of the manual feed sensor assembly this sensor detects low toner by responding to the magnetism of the toner in the cartridge Basics Function of Main Components 5 Paper Transportation Transfer Roller Assembly A 7 n N Transfer Roller Assembly The transfer roller is in contact with the drum in the toner cartridge The roller is driven by the drum gear so that the roller surface moves at the same speed as the drum surface The transfer roller applies a positive charge to the back side of the paper when the paper travels between the roller and the drum The negatively charged toner image transfers from the drum surface to the front side of the paper because it is attracted by the positive charge on the back side of the paper Transpo
87. t line of defense in isolating faults between the 1 0 board and printer engine If the I O board and shield have been removed from the printer you can print a service test page by jumpering the two pins of connector P23 on the DC controller board m 12 Overview RAM Memory The LaserWriter comes with 16 megabytes MB of RAM soldered onto the 1 0 controller board There is one SIMM slot available for installing additional RAM The following table lists the memory requirements and supported paper sizes for duplex printing and PhotoGrade Memory 16 MB 20 MB 24 MB 32 MB 48 MB Duplex Printing Letter A4 B4 legal Letter A3 A4 B4 legal ledger Letter A3 A4 B4 legal ledger Letter A3 A4 B4 legal ledger Letter A3 A4 B4 legal ledger PhotoGrade Letter A4 B5 Up to ledger and A3 Up to Japan Standard and Japan Larger All supported paper sizes All supported paper sizes Use both features at once No Yes up to letter and A4 Yes up to legal Yes up to B4 Yes all supported paper sizes n Overview SIMM Sizes and Speeds 13 SIMM Sizes and Speeds Size Configuration Speed Connector type 4 MB SIMM 1 M X 32 bit one 4 MB bank 70 ns or less 72 pin 8 MB SIMM 2 M X 32 bit two 4 MB banks 70 ns or less 72 pin 16 MB SIMM 4 M X 32 bit one 16 MB bank 70 ns or less 72 pin 32 MB SIMM 8M X 32 bit two 16 MB banks 70 ns or less 72 pi
88. tacts on the left guide assembly see graphic below Toner Cartridge Contacts The toner contacts on the left guide are visible when the printer is open and the toner cartridge is removed see graphic below However it may be difficult to tell if the contacts are actually bent or damaged without removing the part from the printer ui oi Troubleshooting Blank Page or Light Printing 36 The graphic below shows a closer look at the toner cartridge contacts inside the printer Continue with the procedure to identify if the toner contacts are causing the problem Toner C artridge Contacts ui Troubleshooting Blank Page or Light Printing 37 1 Remove the left guide assembly Measure the metal contacts If the contacts are good as shown below the left contact will measure about 10 mm high and the right contact will measure about 8 mm high GOOD CONTACTS 2 If the contacts are bad the height of the contacts will measure less than specified above For example in the graphic below the left contact measures approximately 7 mm high and the right contact measures about 5 mm high Replace both the left and right guides if either of the contacts are bad part 076 0764 BAD CONTACTS ui oi Troubleshooting Paper Skewing 38 Paper Skewing Paper skewing issues can be attributed to improper loading of the paper into the cassette tray using paper types that are too heavy and using paper types
89. tartup page Go to Flowchart 8 Is the print quality okay Go to Image Defects in Troubleshooting Basic simplex printing is okay ui lol Troubleshooting Flowchart 2 10 Flowchart 2 Symptom The fan does not come on when you switch on power Have you recently serviced the printer and has this symptom existed ever since This is very likely a result of cables that have not been reconnected Remove the left cover and check connector J3 on the I O board If J3 is okay remove the board and shield and inspect the printer taking special note of J122 on the power supply qT Does the problem still exist Return to O in Flowchart 1 Check to make sure that the line voltage from the wall is correct and that the rated voltage for this printer 110V or 220V matches what exists at your location If the problem persists replace the power supply ui Housing and Xerographics in Basics and Have you recently serviced the printer and has this symptom existed ever since This is very likely a result of cables that have not been reconnected Remove the left cover and the board and shield Inspect the printer taking special note of the main motor connector J16 on the DC controller board Symptom Mechanical drive is not getting to the delivery ro
90. te guide from the frame and remove the cassette guide from the printer m Cassette Paper Present Actuator Cassette Paper Present Actuator 72 Cassette Paper Present Actuator Before you begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Left lower cover Turn in chute Turn chute cover 1 0 board Power supply Left cassette guide assembly Take Apart Cassette Paper Present Actuator 73 5 1 Push the shaft of the cassette paper present actuator inward to release it from the outside collar 2 Release the far end of the actuator from its collar slide the actuator to the right and remove it from the printer hy m Cassette Pickup Roller s 74 Pickup Roller Cassette Pickup Roller s Before you begin remove the following e Fuser access cover e Left top cover e Left cover assembly e Front left cover e Turn in chute e Turn chute cover e O board 1 Press down the armature of the cassette pickup solenoid to engage the feed gear with the feed idler gear uu Cassette Pickup Roller s 75 2 Rotate the rotor of the main motor clockwise until the rubber surface of the pickup roller faces downward 3 Hold the pickup roller shaft firmly with one hand With the other hand pull the roller off the shaft Replacement Note Match up the pin inside the r
91. that have surface finishes that have difficulty feeding through the LaserWriter s paper path To minimize skewing problems on the LaserWriter 8500 it s important to check the following 1 The rear and side paper guides see below should be set flush against the paper stack when loading paper into the cassettes and multipurpose tray not shown See the next graphic for a close up of the guides pushed up against the paper Paper Guides Paper Cass ette Tray With Paper lol Troubleshooting Paper Skewing 39 2 Check the size and type of paper used in the printer Paper weight paper sizes and print materials must be supported by the printer The paper weight should not exceed 28 Ib maximum when printing from the cassette trays and 32 Ib maximum when printing from the multipurpose tray Test heavily textured or specialty papers to make sure that they work satisfactorily Use paper sizes which range from 3 9 inch by 5 8 inch minimum to 13 inch by 20 inch maximum Print only on supported materials which include plain paper transparencies labels envelopes and postcards 3 Feed letter and A4 paper long edge first into the printer If skewing still occurs carefully inspect the entire paper path for obstructions such as paper remnants from previous paper jams stuck labels and paper feed rollers contaminated with paper dust This information is also referenced in TIL article 24603 ui ol Troubleshooting Flas
92. u begin remove the following Fuser access cover Left top cover Left cover assembly Front left cover Left lower cover Turn in chute Turn chute cover 1 0 board Power supply Left Cassette Guide Assembly Io Take Apart Left Cassette Guide Assembly 65 1 Disconnect the cables Cables Screw from the cassette feeder mn board pickup solenoid and the turn clutch 2 Remove the three screws on the outside face of the chassis that secure the cassette guide assembly to the chassis wall Screw lol Take Apart Left Cassette Guide Assembly 66 Clamp 3 Remove the screw on the inside face of the cassette guide that secures the cassette guide assembly to the chassis wall Free the turn clutch cable from the clamp Using a flat blade screw driver push the three tabs at the bottom of the cassette guide one by one to release them from the printer frame Tilt the cassette guide pulling its bottom edge from the inside of the printer frame i Io Take Apart Left Cassette Guide Assembly 67 7 Ensure that the three upper hooks of the cassette guide are released from the printer frame 8 Push all harnesses on the cassette guide to free them from the printer frame 9 Remove the cassette guide from the printer frame Take Apart Cassette Paper Present Sensor 68 Al 65 Cassette Paper Present Sensor Bef
93. u may have erred in reassembly Yes perhaps in the paper handling gear assembly main gear assembly or in the two clutches Have you recently serviced the printer and has this symptom existed ever since If the jam is in the fuser area make sure the fuser is fully seated and the fuser guide lever is undamaged see Basics Firstly make sure that the paper being used is within specification and that there is no obstruction in the paper path If paper is okay and the path is clear try printing in other ways to see if paper feed is successful Multipurpose vs cassette Success from the multipurpose tray may suggest a problem with the cassette or cassette pickup elements Short edge vs long edge feed Success in one mode and not the other might suggest a registration or cassette size sensor problem Service page vs host print job Successful printing of a service test page when normal pages jam suggests a problem with the I O board Printer location time of day Successful printing in one location or at certain times of day suggests humidity or temperature factors that are out of spec ui Troubleshooting Image Defects 17 Image Defects The following graphic shows examples of image quality defects Refer to the appropriate troubleshooting table to get an idea of the possible root causes of the problem Note Before troubleshooting image defects always try a known good tone
94. ubleshooting Image Defects 21 99 section later in this chapter Other root causes for this symptom are faulty transfer roller or high voltage power supply ui lol Troubleshooting Image Defects 22 4 Dark Image Background This condition is consistent with an overly high charge being imparted to the imaging components or improper grounding of the transport chute or fuser assemblies Confirm that known good paper is being used and the density values have not been set incorrectly see Density Adjustment in the Overview chapter for the two methods of density adjustment m Troubleshooting Image Defects 23 5 Black Vertical Lines Run a service test page If the symptom disappears the problem is likely with the I O board If the symptom persists the problem is not with the I O board Feed Direction If the symptom persists the problem is likely with the fuser assembly or laser scanner assembly m lol Troubleshooting Image Defects 24 6 White Vertical Lines This condition is consistent with an obstructed laser beam Check to see if there is a hair or some other obstruction that could be A 4 amp blocking the laser beam FAT 4 4A A a service test If the symptom disappears the problem is likely with the I O board If the symptom persists the problem is not with the 1 0 board but probably with the laser scanner assembly
95. uplexer chassis Replacement Note For the carriage support to fit squarely the four offset assembly bear ings must be fully seated in the chassis frame lt p Duplexer Offset Assembly 184 3 Slide the offset assem bly right and left to free the four bearings from the chassis frame 4 Lift the gear end of the offset assembly from the frame pull the opposite end free from its collars and remove the offset assembly from the duplexer 5 Remove the gears and the bearings from the two shafts m lol Take Apart Duplexer Upper Feed Roller 185 Upper Feed Roller Before you begin remove the following e Duplexer from the printer e Upper cover Left cover Right cover 1 Set the duplexer flat on the work surface Upper Feed Roller quip Take Apart Duplexer Upper Feed Roller 186 E Ring Upper Feed Roller Collar Gear amp T F Seng Bearing n a Drive Belt 2 Disconnect the cable going into the paper pass sensor Remove the E ring at the left end of the feed roller shaft and slide the collar gear with drive belt and bearing off the shaft Remove the gear and bearing from the right end of the shaft Remove the roller from the duplexer m lol Take Apart Duplexer Lower Feed Roller 187 Lower Feed Roller Before you begin remove the following e Duplexer from the printer e Upper cover Left cover
96. working or host computer software The POS mode can be initiated through the Printer Utility or by pressing and holding the Ready LED during printer startup see Overview lt gt Troubleshooting EPOST Extended Power On Self Test 6 EPOST Extended Power On Self Test EPOST behaves exactly like POST in that it checks the same three areas in the same order and displays an error array if a fault is detected However EPOST has more extensive testing and its error arrays are completely different When a fault is detected during EPOST all LEDs extinguish and the status panel will loop through the following sequence until you switch off power e All LEDs for approximately one second All LEDs Off for approximately one second e EPOST Error Code for approximately one second All LEDs Off for approximately two seconds then repeat loop If no error is detected by EPOST an EPOST test page will print before control is passed on to the PostScript interpreter quip Troubleshooting EPOST Extended Power On Self Test EPOST Error Codes 7 EPOST Error Codes All LEDs on for a second then off for a second followed by a one second display of EB EE 9

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