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Book.P780 Train - el Museo de los 8 Bits

1. 7167 7742 HIGH VOLTAGE POWER SUPPLY Jai EN LOW VOLTAGE en T K F 1 335 POWER SUPPLY HA E A C D F G Je BIAS CHARGE Bor vers couracr bis PLATE DEVE H R HEATER P R HEATER 3 Er TT Jus 3e AU CONNECTOR CONTACT BIAS PLATE M S H GY CY BY r i ASSY ASSY ae ee Ne ET TJ J12 J70 J97 191 HJ 192 193 194 h TOL CONTACT SECOND TEMP SENSOR ASSY 72 RIGHT FRONT COVER SWITCH COVER DRUM Developer ST BTR CAM _ 4 319 E di SWITCH CARTRIDGE Assy PL8 2 13 mr ASSY FUSER EXIT SENSOR 775 un io 11 3107 LEFT FRONT COVER SWITCH REGI SENSOR Ja ROLL 0 19 _ XO ACCUMULATOR MAINIFUSER ASSY Ha Laser LASER FRONT OHP SENSOR 095 ET BELTASSY OIL ROLL CRU SWITCH assy J77 ku p Scanner SCANNER ER SECOND SECOND Detack ASSY 7H 0 J14 1121 Assy REAR SENSOR Jog Mio Saw 3123 Scanner Assy an FUSER OIL CAM SOLENOID ERE t PRE REGI CLUTCH O TRAY J73 1318 j JRA StartofScan NC J Jay USED CART SENSOR ASSY Le CALIBRATION Tai EXCHANGE SOLENOID 194 UND TONER CARTRIDGE Mr ADC SENSOR ASSY 11617 J89 114168 SENSOR CLEANER CAM SOLENOID jeg REGEBRAKE GEUTE lj 358 CAROUSEL SENSOR ERASE LAMP ASSY 218 MA
2. Parts Part number Serial number Qty Name and description Effective Discont d 016 1678 00 Toner Cartridge Black 016 1679 00 Toner Cartridge Cyan 016 1680 00 Toner Cartridge Magenta 016 1681 00 Toner Cartridge Yellow 016 1864 00 Imaging Unit Cartridge 016 1865 00 Imaging Unit Waste Cartridge 016 1866 00 Standard Fuser Roll Cartridge 016 1717 00 High Duty Fuser Roll Cartridge 016 1369 00 A4 Size Paper 500 Sheets 016 1697 00 Tab Plus Glossy 100 50 Sheets 016 1699 00 Plain Paper 24 b 500 Sheets 016 1700 00 Plain Paper 24 a3 500 Sheets 016 1701 00 Transparency A 50 Sheets 016 1702 00 Transparency A4 50 Sheets 016 1703 00 Paper Image Transfer B 100 Sheets 016 1704 00 Paper Glossy A 100 100 Sheets 016 1705 00 Paper Glossy A4 100 100 Sheets 016 1706 00 Transparency Tab Extra 50 Sheets 016 1709 00 Paper Tab Plus 24st 500 Sheets 016 1718 00 Paper Glossy Coated B 100 50 sheets 063 3039 00 CD ROM English 063 3039 10 CD ROM French 063 3039 20 CD ROM Italian 063 3039 30 CD ROM German 063 3039 40 CD ROM Spanish 063 3039 70 CD ROM Simplified Chinese 063 3039 80 CD ROM Traditional Chinese 063 3039 90 CD ROM Korean 063 3040 00 User Guide English 063 3040 10 User Guide French 176 Phaser 780 Color Printer Table 20 Supplies and accessories Parts Part number Serial number Effective Discont d Qty Name an
3. FP JT8 J EXCHANGE 74A 74 SOLENOID 87 B8 K3 1 24VDC H B B9 y 2 2 EXCHANGE SOLENOID PULL ON L 24VDC B9 5 K B5 B10 K 1 P J CLEANER CAM SOLENOID 62A 24VDC B5 gt K B9 Y K 2 CLEANER CAM SOLENOID ON L 24VDC B6 5 K B8 875 K 1 EXCHANGE ent FH ON L 24VDC P J FUSER CHUTE FAN 80A FUSER CHUTE FAN ON H 24VDC Bi gt 825 K 2 B2 AG KB12 K 1 FRA 82 84 I P J P J19 76 5VDG 7 S kmu any 3 AG 8 KAI3 2 K 2 FUSER IN PAPER SENSED L 5VDC gt lt Kai2 a3 K 1 AI ARA LI c NIA 81 51 58 54 86 57 89 812 P720 ENVIRONMENT SENSOR ENVI RONMENT TEMP 20 21 AG FI 810 811 3041 26 Wiring 8 Engine control board fuser assembly environment sensor 208 Phaser 780 Color Printer ENGINE CONTROL BOARD AG PAPER SIZE SWITCH ASSY 5VDC gt 1 SIZE SWITCH FEED SOLENOID TRAY NO PAPER SENSOR PULL UP 5VDC gt AG 1 TRAY PAPER SENSED L 5VDC 1 Low PAPER SENSED L 5VDC LOW PAPER SENSOR AG AG P J P J 104A 104 K 3 1 5VDC gt K2 2 K1 3 3041 27 Wiring 9 Engine control board paper size switch board feed solenoid no paper sensor low paper
4. Toner developer dispense motor 780 5 80 Removing the toner developer dispense motor 104 Phaser 780 Color Printer Carousel assembly 1 Remove each developer assembly Remove the knob screw Remove the screw securing the knob in place Release the knob latch by inserting a screwdriver blade through the slot in the front of the knob Remove the carousel motor Remove the toner developer dispense motor Pull the fuser unit a few inches out of the printer Remove the low voltage power supply Remove the fuser drive gear train Remove the developer clutch Remove the developer tie plate Remove the carousel sensor Remove the large E ring securing the rear carousel bearing to the rear of the printer frame Slide the rear bearing off the carousel frame shaft Slide the front carousel bearing off of the carousel frame shaft Slide the carousel frame assembly to the front of the printer frame Pull the rear of the carousel frame assembly free of the rear frame swing the rear of the assembly out of the printer Remove the assembly Service Guide 105 Screw pa Carousel assembly Front bearing 780 5 54 Removing the carousel assembly 106 Phaser 780 Color Printer Carousel motor 1 Remove the rear cover 2 Disconnect the wiring harness from the carousel motor Remove the three screws securing the carousel motor to the printer frame Remove the motor Reverse these steps to insta
5. Parts Partnumber Serial number Qty Name and description Effective Discont d 1 118 9766 00 1 Paper feeder turn chute 2 118 9765 00 1 Paper feeder cover 3 118 9865 00 1 paper feeder assembly Service Guide 147 780 5 124 Paper feeder FRUs Phaser 780 Color Printer 148 Table 6 Paper feeder FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9771 00 1 Registration rubber roller 2 118 9768 00 1 Feeder pre registration roller 3 118 9770 00 1 Registration clutch 4 118 9721 00 1 Registration spring kit 4a Rear spring black 4b Front spring silver 5 118 9769 00 1 Pre registration clutch 6 118 9767 00 1 Pre registration knob 7 118 9752 00 1 Registration sensor Service Guide 149 780 5 125 Imaging FRUs Phaser 780 Color Printer 150 Table 7 Imaging FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9774 00 1 Laser unit 2 118 9778 00 1 Erase lamp 3 118 9777 00 1 Auto density calibration sensor assembly 4 118 9722 00 1 Bias charge roller connector kit with wiring harness 5 118 9779 00 1 Waste cartridge full sensor 6 118 9780 00 1 Waste cartridge installed sensor 7 118 9781 00 1 Imaging unit connector Service Guide 151 780 5 126 Developer FRUs Phaser 780 Color Printer 152 Table 8 Developer FRUs Parts Part number Serial number
6. Registration brake clutch Multi purpose pick up solenoid Multi purpose tray clutch 3041 06 Solenoids and clutches on the print engine Service Guide 9 The image processor Real Time Clock NVRAM SCSI riser card NVRAM Network card Postscript code ROM DIMM 3041 07 Features of the image processor board 10 Phaser 780 Color Printer Front panel These front panel features are found on the printer B Atwo line 40 character LCD Six push buttons m Five LEDs LCD The LCD serves two purposes Displaying current image processor and print engine status information and displaying an interactive menu Status information includes image processor status such as Ready Processing and Printing Print engine status includes messages such as Out of paper Paper Jam and Toner Low The interactive menu can only be entered while the printer is idle and ready The interactive menu has two modes review and modify Customers can review and modify certain NVRAM I O ports and peripheral parameters Buttons Button 6 the left most button is an Exit key used to cancel an operation while in the interactive menu The functions of the remainder of the buttons are defined by the particular menu or function being displayed on the LCD The bottom row of the LCD labels the current function of each button Phaser 780 E t l FL D 3041 18 Print
7. Lower Tray Assembly feeder board to feeder chute switch size switches and feeder motor 216 Phaser 780 Color Printer FEEDER BOARD TRAY NO PAPER SENSOR LOW PAPER SENSOR TRAY NO PAPER SENSOR LOW PAPER SENSOR Wiring 17 Lower Tray Assembly feeder board to no paper sensors and low paper sensors TRAY NO PAPER SENSOR LOW PAPER SENSOR P J213 P J176 PULL UP 5VDC 1 3 2 AG 2 2 TRAY PAPER SENSED L 5VDC 2 La 4 PZJ P J 187 187 2 LOW PAPER SENSED L 5VDC 5 lt aji 6 AG 1 2 5VDC P J214 P J180 PULL UP 5VDC 1 gt 3 2 AG 2 3 TRAY PAPER SENSED L 5VDC 3 lt 1 4 PZJ P J 188A 188 5 3 LOW PAPER SENSED L 5VDC gt 6 AG 1 2 5VDC P J215 P J218 PULL UP 5VDC 1 gt 3 2 AG 2 4 TRAY PAPER SENSED L 5VDC i 4 P J P J 2194 219 4 LOW PAPER SENSED L 5VDC 5 4 2 L 2 1 6 AG 1 2 3041 62 Service Guide FEEDER BOARD FEED SOLENOID 3T P J182 1 24VDC 2 FEED SOLENOID ON L 24VDC 2 gt FEED SOLENOID 3T P J178 1 24VDC 3 FEED SOLENOID ON L 24VDC 2 gt FEED SOLENOID 3T P J216 4 24VDC 4 FEED SOLENOID ON L 24VDC 2 gt TURN
8. Phaser 780 Color Printer 142 Table 3 Multi purpose tray cover FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9748 00 1 Multi purpose tray left front cover 2 118 9749 00 1 Multi purpose tray right rear cover 3 118 9751 00 1 Multi purpose tray extender 4 118 9750 00 1 Multi purpose tray holder 5 118 9720 00 1 Multi purpose tray assembly items 1 thru 4 Service Guide 143 780 5 122 Multi purpose tray FRUs Phaser 780 Color Printer 144 Table 4 Multi purpose tray FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9763 00 1 Multi purpose tray pad kit 2 118 9752 00 1 Multi purpose tray edge sensor 3 118 9754 00 1 Multi purpose tray paper sensor actuator 4 118 9827 00 1 Multi purpose tray paper sensor 5 118 9756 00 1 Multi purpose tray pick up cam gear 6 118 9757 00 1 Multi purpose tray cam gear spring 7 118 9758 00 1 Multi purpose tray pick up gear 8 118 5759 00 1 Multi purpose tray pick up spring 9 118 5760 00 1 Multi purpose tray pick up solenoid 10 118 9755 00 2 Multi purpose pick roller kit 11 118 9752 00 1 Multi purpose tray long paper sensor 12 118 9762 00 1 Multi purpose tray gear 13 118 9761 00 1 Multi purpose tray clutch Service Guide 145 780 5 123 Paper feeder cover FRUs Phaser 780 Color Printer 146 Table 5 Paper feeder cover FRUs
9. PROCESS MOTOR ON L 5VDC 31 gt AN PROCESS MOTOR HALF SPEED L 5VDC 32 gt AR 33 AG Me 34 PROSESS MOTOR CLOCK I S2 4 812 LOW VOLTAGE POWER SUPPLY RTN 24VDC gt 24VDC gt RTN 3041 24 Wiring 6 Engine control board low voltage power supply bias transfer roller cam solenoid accumulator belt sensor paper feeder motor process motor 206 Phaser 780 Color Printer FUSER ASSY LOW VOLTAGE POWER SUPPLY MAIN FUSER ASSY TEMP SENSOR ASSY FUSER EXIT SENSOR P J35 P J71 i ACN 3 ACL 2 gt 1 Thermal Fuse Thermostat FUSER UPPER ASSY E TOT A D I I d Power Switch Fes RAE parer e rr J P J ENGINE CONTROL BOARD EDO P J19 L 10 1 A4 wy AG A10 A5 PULL UP 5VDC 12 5 gt A9 A6 L 13 AG A8 A7 FUSER EXIT PAPER SENSED L 5VDC 14 5 lt AT A8 L 15 AG A6 A9 FUSER ASSY SENSED L 5VDC 16 lt A5 A10 CRU SWITCH OIL ROLL SENSED L 5VDC L 17 D M A11 18 AG A12 NEW OIL ROLL SENSED L 5VDC 19 5 lt D A2 A13 EY 84 86 51 88 88 59 812 3041 25 Wiring 7 Engine control board low voltage power supply fuser oil roll assembly Service Guide ENGINE CONTROL BOARD FUSER TRAY ASSY P J18 P J71 FIT 1 P J P J 71A 73A 73 OIL CAM SOLENOID 24VDC gt KB11 K 15 OIL CAM SOLENOID ON L 24VDC Leto
10. Preferable they should be centered 2 Blur The lines should be crisp and sharp with no fuzzy appearance 3 Ghosting No ghost images of the square patterns should appear in the gray bar below the square patterns 4 Uniform RGB The secondary color squares should be uniformly colored with no mottling 5 Resolutions The thin lines should be fully separated from each other 6 Text The text should be sharp with no discernible voids i mM EN ml a _ M Interpreting Service Print 3 0O Service print 3 should always be printed on B size paper HEABJEBGE 1 Skew The difference between the values measured at each corner of the B leading edge of the print should be no HN greater than 2 mm 2 Leading edge The value measure the leading edge to the indicated line should be 14 9 mm 2 mm 3 Side edge The value measure from the side edge to the center should be 148 5 mm 4 2 5 mm When the print is accurately folded in half lengthwise the center line should be in the center of the crease TRAIL EDGE 3041 35 180 Phaser 780 Color Printer 3041 36 Interpreting Service Print 4 Service print 2 should always be printed on B size paper The print reveals repeating defects that can be traced back to defects on the printers belts dr
11. Qty Name and description Effective Discont d 1 118 9782 00 1 Developer assembly Black 2 118 9783 00 1 Developer assembly Cyan 3 118 9784 00 1 Developer assembly Magenta 4 118 9785 00 1 Developer assembly Yellow 116 0073 00 Developer shim kit 1 each of 4 sizes Service Guide 153 780 5 127 Carousel FRUs Phaser 780 Color Printer 154 Table 9 Carousel FRUs Parts Part number Serial number Qty Name and description 1 118 9787 00 1 Toner cartridge presence sensor 2 118 9724 00 1 Developer contact assembly 3 118 9820 00 1 Carousel knob 4 118 9723 00 Carousel assembly kit 4a 1 Carousel knob 4b 1 Carousel front bearing 4C 1 Carousel frame 4d 1 Carousel rear bearing 5 118 9788 00 1 New toner cartridge sensor 6 118 9786 00 1 Carousel home sensor Service Guide 155 E re ee 780 5 128 Accumulator belt assembly FRUs Phaser 780 Color Printer 156 Table 10 Accumulator belt assembly FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9790 00 1 Tension lever 2 118 9726 00 Belt cleaning assembly kit 2a 1 Cleaner support assembly 2b 1 Belt cleaner 3 118 9791 00 1 Second bias transfer roller cam assembly 5 118 9789 00 1 Accumulator belt assembly 6 118 9793 00 1 Waste auger assembly 7 118 9792 00 1 Transfer roller cam solenoid 8 118 9725 00 Second bias
12. 4 Replace the engine control board Media Lowin engine control board detected that 1 Add paper to tray 2 Tray 2 the tray 2 low paper sensor is actuated 2 Check for damaged or missing sensor actuator 3 Replace the tray 2 low sensor 4 Replace the engine control board Media Lowin engine control board detected that 1 Add paper to tray 1 Tray 1 the Tray 1 Low Paper Sensor is 2 Check for a damaged or actuated missing sensor actuator 3 Replace the tray 1 low sensor 4 Replace the engine control board Load Media The multi purpose tray is out of paper 1 Load paper into the in Multi The engine control board detected that multi purpose tray purpose Tray long multi purpose tray papersensor 2 Testthe multi purpose tray is not actuated papersensors 3 Replace the engine control board Load Media Tray 4 is out of paper 1 Load paper into Tray 4 in Tray 4 The engine control board detected that 2 Testthe paper empty sensor 3 the paper empty sensor in tray 4 is actuated Replace the lower feeder circuit board Replace the lower feeder assembly Replace the engine control board Service Guide 29 Error code and message Description Corrective action Load Media in Tray 3 Tray 3 is out of paper The engine control board detected that the paper empty Sensor in tray 3 is actuated Load paper into Tray 3 Testthe tray s paper empty Sensor Replace the lower feede
13. Hardware 2 118 9733 00 Inner cover includes 3a and 3b 3 118 9715 00 Carousel latch kit 3a Carousel latch lever 3b Carousel latch spring 3c Carousel latch assembly 4 118 9737 00 Left lower cover 5 118 9739 00 Front LCD panel 6 118 9734 00 Top cover and stopper 7 118 9716 00 Rear cover assembly kit 7a Toner Filter 7b Rear cover 7 118 9864 00 Access cover 8 118 9738 00 Right cover with shield 9 118 9884 00 Front lower cover 10 118 9735 00 Stopper 11 118 9736 00 Toner filter 12 118 9864 00 Access cover Service Guide 139 N Paper feeder FRUs Phaser 780 Color Printer 140 Table 2 Paper feeder FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9747 00 1 Size switch board 2 118 9742 00 1 Feed gear 3 118 9743 00 1 Feed spring 4 118 9744 00 1 Feed solenoid 5 118 9717 00 2 Paper pick rollers 6 118 9718 00 Turn roller assembly kit 6a 1 Turn gear pin 6b 1 Turn arm spring 6c 1 Turn rear bearing 6d 1 Turn assembly 6e 1 Turn gear 6f 1 Turn roller shaft 1 Turn front bearing 7 118 9983 00 1 Feed roller bearing 8 118 9745 00 1 Turn chute 9 118 9719 00 Paper empty sensor assembly kit 9a 1 Empty sensor harness 9b 1 Empty sensor 9c 1 Sensor actuator 9d 1 Sensor bracket 9e 1 Low paper sensor 10 118 9746 00 1 Tray stopper Service Guide 141 780 5 121 Multi purpose tray cover FRUs
14. Removing the registration brake clutch 85 Removing the metal registration roller 86 Removing the rubber registration roller 87 Removing the feeder pre registration clutch 88 Removing the feeder pre registration roller 90 Removing the paper pick turn roller 91 Removing the paper feed drive gear train 92 Removing the paper feed motor 93 Removing the multi purpose tray roller assembly 94 Removing the multi purpose tray pick rollers 96 Removing the auto density calibration sensor 98 Removing a developer assembly 100 Removing the developer clutch 101 Removing the developer tie plate 103 Removing the toner developer dispense motor 104 Removing the carousel assembly 106 Removing the carousel motor 107 Removing the carousel motor board 108 Removing the carousel sensor 109 Removing the laser unit 111 Removing the erase lamp rail assembly 113 Removing the erase lamp 114 Removing the process drive unit 116 Removing the waste auger assembly 118 Removing the accumulator belt assembly 120 Removing the accumulator belt cleaner assembly 121 Removing the second bias transfer roller assembly 122 Service Guide xi Removing the second bias transfer roller cam assembly 124 Removing the fuser assembly 125 Removing the fuser drive gear train 127 Removing the lower exit assembly 129 Removing the stack full sensor 130 Removing the low voltage power supply 131 Removing the high voltage power supply 132 Removing the image processor 133 Remov
15. Temperature rod control The engine control board ensure the fuser connectors Error detected that the fuser heat rods are properly seated Error 41 remained on longer than the specified 2 Close the fuser and power time Cycle the printer Check that the fuser heats up 3 Check for line voltage at P J 71 pins 1 and 2 If no voltage is present replace the power supply 4 Replace the fuser 5 Replace the engine control board 22 Phaser 780 Color Printer Error code and message Description Corrective action Fuser Temperature Error Error 42 There is a problem with the fuser The engine control board senses an open temperature sensor circuit Open the fuser door and ensure the fuser connectors are properly seated Close the fuser and power cycle the printer Check that the fuser heats up Check for line voltage at 71 pins 1 and 2 If no voltage is present replace the power supply Replace the fuser Replace the engine control board Fuser Temperature Error Error 43 There is problem with the fuser The engine control board detected that the fuser did not reach ready temperature during the specified time NR Open the fuser door and ensure the fuser connectors are properly seated Close the fuser and power cycle the printer Check that the fuser heats up Check for line voltage at 71 pins 1 and 2 If no voltage is present repl
16. test listen for clicks of sensor wiper solenoid Auto density Calibration Sensor Motors Solenoids Process Motor Slow Fast Paper Feed Motor On Off Laser Motor On Off Toner Dispense Motor One Time Lower Feeder Motor On Off MPT Feed Clutch MPT Pick Solenoid MPT Pre Registration Clutch MPT Registration Clutch Developer Clutch Second Bias Transfer Clutch Oil Roller Solenoid Belt Cleaner Solenoid Tray 2 Pick Solenoid Tray 3 Pick Solenoid Tray 4 Pick Solenoid Tray 2 Feed Clutch 7i Service Guide Table 1 Diagnostic tests Test Sub tests Detail Motor Solenoids cont Tray Feed Clutch Tray 4 Feed Clutch Rear Fan Slow Fast Speed Fuser Fan Slow Fast Speed Erase lamp On Off Fuser Lamp heater On Off Front Panel Front Panel Display Front Panel LEDs Life Data Save Life Count The Save function copies Restore Life Count all consumable and FRU counts from the engine control board NVRAM to the image processor board The Restore function returns the values to the engine control board NVRAM The Save function must be performed prior to replacing the engine control board Perform the Restore function after the replacement Drum Unit Life Yellow Toner Life Magenta Toner Life Black Toner Life Cyan Toner Life Printer Life Bias Transfer Roller Life Belt Cleaner Life F
17. 003 1633 00 IC PLCC Extractor Tool 065 0574 00 Repackaging Kit 650 3572 01 Rebanding Kit 650 3971 00 Recycle kit for developer assemblies California only 003 1496 00 Vacuum cleaner 110 115 VAC 003 1497 00 Vacuum cleaner 220 240 VAC 003 1498 00 Vacuum cleaner filter Type 2 3M 004 4845 00 Shipping Box 003 0602 00 1 Pozidrive screwdriver tip 006 7971 00 Imaging unit lightshield 178 Phaser 780 Color Printer Test Prints This topic illustrates the test prints produced by the print engine It also illustrates a number of defective prints and the reason for the defects The topic Printing and print quality problems on page 43 discusses solutions to the problems shown in this appendix Consumables Print consists of four 25 tint primary color bands and gas gauges for each consumable Service Print 1 prints out four 25 tint full page fills each page one primary color 1 Replace Magenta Toner Cartridge Press i for information 6 000 m 2 Help Pages Consumable Pages Print 6 000 mg 3 Help Pages Service Print 1 Print 6 000 mg Service Print 1 Phaser 780 Color Printer Service Guide 179 Interpreting Service Print 2 Service print 2 should always be printed on B size paper 1 Color registration The thin lines should not be above or below the think line
18. 8 F804 Top exit sensor P J161B 166 Map 8 E804 Exit chute switch P J161B 167 Map 8 G802 Full stack sensor P J163B 168 Map 8 J802 Cartridge sensor P J89 191 Map 1 E109 Right front cover switch P J97 192 Map 1 E109 Right front cover switch P J33 193 Map 1 E109 Right front cover switch P J33 194 Map 1 E109 Right front cover switch P J195 195 Map 6 H607 Top cover switch P J195A 195A Map 6 H607 P J195 P J194 P J196 196 Map 2 F203 Laser diode assembly P J121 P J195 Low voltage power supply P J33 197 Map 5 H506 Left front cover switch P J197A 197A Map 5 H506 P J197 Engine control board P J19 201A Map 4 1408 P J201B Multi purpose tray assembly P J113B 201B Map 4 1408 Pick up solenoid P J201A 202A Map 4 H408 P J202B Multi purpose tray assembly P J113B 202B Map 4 H408 Multi purpose tray pick up solenoid P J201A 203 Map 4 G409 Multi purpose tray short no paper Multi purpose tray assembly P J 113B sensor 204 Map 4 G408 Multi purpose tray edge sensor Multi purpose tray assembly P J92B P J207 205 Map 4 H409 Multi purpose tray OHP sensor Multi purpose tray assembly P J92B P J207 Service Guide Plug Jack Locations 7 P J Map amp Coordinates Connected to Other end connected to 206 Map 4 G409 Multi purpose tray long no paper Multi purpose tray Assembly P J92B sensor P J207 207 Map 4 F409 Multi purpose tray assembly P J92B P J204 P J205 P J206 245 Map 6 F608 Carousel mot
19. CLUTCH 3T P J189 1 24VDC 2 TURN CLUTCH ON L 24VDC _ 2 gt TURN CLUTCH 3T P J190 13 24VDC 3 TURN CLUTCH ON L 24VDC 2 gt TURN CLUTCH 3T P J217 4 24VDC 4 TURN CLUTCH ON L 24VDC gt 3041 63 Wiring 18 Lower Tray Assembly feeder board to feed solenoids and turn chutes 218 Phaser 780 Color Printer Service Guide 220 Phaser 780 Color Printer
20. Erase lamp latch 780 5 49 Removing the erase lamp 114 Phaser 780 Color Printer Process drive unit e SND Remove the imaging unit Remove the paper feeder Remove the paper feeder drive assembly Remove the erase lamp rail assembly Disconnect the wiring harness leading to the process motor Unhook the wires from the wire harness clip attached to the process drive unit Remove the screw securing the high voltage power supply bracket Move the bracket out of the way Inside the printer frame remove the two screws securing the process drive unit to the rear of the accumulator belt assembly Hold the process drive gear train it is heavy while you remove the seven screws securing the drive unit to the printer frame Carefully pull the assembly away from the frame Reverse these steps to install the process drive unit Ensure the front bearing of the accumulator belt assembly is inserted fully into its receiver hole of the printer frame Service Guide 115 Accumulator belt bracket unit High voltage power supply bracket Wiring harness 780 5 77 Removing the process drive unit 116 Phaser 780 Color Printer Waste auger assembly Caution Be careful not to spill waste toner from the auger assembly e oS m oc e 10 Vacuum the auger before removal Remove the accumulator belt assembly Remove second bias transfer roller assembly Remove the paper feed motor Remove the fu
21. SOLENOID 3T TRAY NO PAPER SENSOR P J216 P J214 P J180 TURN CLUTCH 3T LOW PAPER SENSOR P J189 P J188 TURN CLUTCH 3T TRAY NO PAPER SENSOR P J190 P J215 P J218 TURN CLUTCH 3T LOW PAPER SENSOR P J217 P J219 4 3041 59 Wiring 14 Lower Tray Assembly master wiring diagram 214 Phaser 780 Color Printer ENGINE CONTROL BOARD FEEDER BOARD AG LOW VOLTAGE POWER SUPPLY FUSER EXIT 3041 60 Wiring 15 Engine control board and low voltage power supply to Lower Tray Assembly feeder board Service Guide FEEDER BOARD FEEDER CHUTE SWITCH P J211 P J175 FEEDER CHUTE SWITCH ON L 5VDC 5 2 2 AG 1 FEEDER CHUTE SWITCH P J174 2 o 4 SIZE SWITCH ASSY P J212 P J177 1 AG 3 5VDC _ 2 gt 2 2 SIZE SWI TCH 3 lt SIZE SWITCH ASSY P J181 4 AG 3 5VDC 5 5 2 3 SIZE SWITCH 6 lt 1 SIZE SWITCH ASSY P J172 7 AG 3 5VDC L 8 5 2 4 SIZE SWITCH 9 lt FEEDER MOTOR P J171 P J183 FEEDER MOTOR CLOCK 1 5 2 AG 4 FEEDER MOTOR ON L 5VDG 3 gt 4 RTN 5 24VDC 3041 61 Wiring 16
22. The image easily rubs off The printer displays no error code 1 Is the image density very light If light but not blank go to the earlier topic Light undertone prints on page 44 2 Check the media weight and settings at the printer driver 3 Check the defaults set at the front panel for media size and type 4 Is the printed image fused to the paper If not replace the fuser 5 Replace the low voltage power supply There is toner on the back of the printed sheet of paper 2 Clean the printer interior Inspect the paper that is loaded in the paper trays Is the paper clean and free of toner Generate a test print and open the front cover just before the sheet of paper reaches the second bias transfer roller about one second after the registration solenoid actuates Slide the paper feeder out of the printer and inspect the back of the sheet of paper Is the back of the sheet of paper clean and free of toner If not clean the paper feeder and its metal and rubber registration rollers 5 Generate a test print and open the front cover just before the sheet of paper reaches the fuser 58 Phaser 780 Color Printer Open the front cover and inspect the back of the sheet of paper Is the back of the sheet clean and free of toner If not replace the second bias transfer roller and if necessary also replace the accumulator belt cleaner assembly Generate a test print and open the front
23. a few inches away from the rear frame Disconnect the wiring harness running to the second bias transfer roller cam assembly Remove the second bias transfer roller cam assembly Reverse these steps to install the second bias transfer roller cam assembly Service Guide 123 Wiring harness Second bias transfer roller cam assembly 780 5 60 Removing the second bias transfer roller cam assembly 124 Phaser 780 Color Printer Fuser assembly 1 Turn off the printer and open the top media tray 2 Remove the screw securing the fuser assembly to the printer frame 3 Slide the fuser assembly a few inches out of the printer 4 Lift the end of the fuser assembly and pull the assembly out of the printer To install the fuser assembly in the printer lift the end of the fuser assembly as you insert the assembly side rails into the guide wheels inside the printer Lower the end of the fuser assembly and slide the assembly into the printer Reinstall the screw to secure the fuser assembly to the printer frame 780 18 01 Removing the fuser assembly Service Guide 125 Fuser drive gear train 1 Remove the fuser unit 2 Remove the low voltage power supply 3 Remove the paper feed drive gear train 4 Remove the wire harness from the paper feed motor bracket 5 Remove the screw securing the paper feed motor bracket to the fuser drive gear train and remove the bracket 6 Reachinside the empty fuser assemb
24. belt Inspect the image on the sheet of paper just before the paper enter the fuser Is there a normal test print image without any spot deletions If no replace the second bias transfer roller Print Service Print 2 and open the front cover just as the sheet of paper exits the fuser Inspect the image on the sheet of paper just after the paper exits the Fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has visible spot deletions after it exits the fuser If yes replace the fuser roll cartridge Make another test print If the problem still occurs replace the fuser Make a test print and the remove the top cover Turn the carousel frame and inspect the magnet roller of each of the four developer assemblies Do the magnet rollers of each developer assembly appear smooth evenly formed without any low spots and without obvious contamination If not replace the defective developer assembly Phaser 780 Color Printer Random spotting 3041 47 There are spots of toner randomly scattered across the page The printer displays no error code 1 10 11 12 Slide the paper feeder out of the printer and inspect the top of the registration chute assembly Is the top of the registration chute assembly free of toner and foreign debris If not remove and inspect the waste toner cartridge Make sure the cartridge is not damaged or leaking If the sp
25. front panel displays Password press and release button 1 then press and release button 3 The display responds with the message Resetting NVRAM Following NVRAM reset the print powers up normally Service Guide 79 80 Phaser 780 Color Printer Key FRU Disassembly This topic illustrates how to remove and replace key printer Field Replaceable Units FRUs Refer to the later topic FRU List on page 137 for a list of the printer s FRUs For more detailed removal replacement procedures refer to the Phaser 780 Service CD ROM Service Guide 81 Paper feeder 1 Slidethe paper feeder far enough out of the printer so you can reach the assembly rails 2 Push in on the front rail latch as you slide the front of the paper feeder out far enough to disengage the latch 3 Pushinon the rear rail latch as you slide the rear of the paper feeder out far enough to disengage the latch 4 Slide the paper feeder out of the printer Reverse these steps to install the paper feeder Rear latch 780 5 34 Removing the paper feeder 82 Phaser 780 Color Printer Feeder registration chute 1 Slide the paper feeder out of the printer You do not need to remove the paper feeder 2 Remove the E ring securing the rear arm of the registration chute to the paper feeder 3 Remove the screw securing the ground wire to the chute Remove the wire 4 Open the registration chute 5 Slide the chute
26. interior Remove the rear cover With the accumulator belt cleaner assembly removed watch the auger drive gear as you manually rotate the paper feed motor Does the fuser drive assembly rotate the auger drive gear If not replace the fuser drive assembly As you manually rotate the paper feed motor place your finger inside the auger opening and feel the movement of the auger spring Does the auger spring rotate when you manually rotate the paper feed motor If not replace the auger assembly Replace the imaging unit Phaser 780 Color Printer Media jams and the paper path Skewed image The image area is twisted or is not parallel with the sides of the page The printer neither jams nor displays an error code 1 Check that the paper tray s metal hooks at the corners of the leading edge of the paper in the tray are not bent or deformed Feed paper out of each of the available paper feeders Does the image skew when fed out of one tray but not when fed out of the others If yes Inspect the paper and tray of the feeder that is skewing to ensure the tray is correctly loaded and the paper is good Replace the multi purpose tray pick up roller or the main tray feed roller Print a test print and slide the paper feeder out about 10 seconds after pressing PRINT Carefully slide the paper feeder out of the printer and inspect the position of the sheet of paper Is the sheet of paper parallel to the edges of the paper feeder If no
27. is longer than the rear Rear bearing Rubber registration roller 3 Rear pe spring 4 black A NC F SY ront a g bearing Gear Front spring silver 780 5 42 Removing the rubber registration roller Service Guide 87 Feeder pre registration clutch 1 Remove the paper feeder Remove the feeder registration chute Turn over the paper feeder and disconnect the wiring harness from the feeder pre registration clutch 4 Remove the two screws securing the feeder pre registration gear assembly to the paper feeder Remove the gear assembly 5 Remove the E rings securing the feeder pre registration clutch and the pre registration gear to the pre registration support Remove the support Slide the feeder pre registration gear off the shaft Undress the J95 wiring harness and slide the feeder pre registration clutch off the feeder pre registration shaft Pre registration clutch Pre registration gear Pre registration support Pre registration gear assembly 780 5 39 Removing the feeder pre registration clutch 88 Phaser 780 Color Printer Feeder pre registration rollers 1 Remove the feeder pre registration clutch as explained in the previous procedure 2 Slide the blue feeder pre registration knob off the feeder pre registration shaft 3 Remove two screws securing the multi purpose tray out holder to the paper feeder Pull the holder away from the feeder 4 Remove t
28. mode where it consumes less than 45 watts of power It awakens upon receiving data at any of its ports 2 Phaser 780 Color Printer Memory considerations The base printer features 32 Mbytes of RAM in one connector and features two additional DIMM connectors which accept 16 32 64 or 128 Mbytes RAM DIMMs The printer can use any off the shelf RAM meeting these specifications m 168 pin DIMM m Synchronous DRAM 3 3 volt 9 nsec speed Valid on board Serial Presence Detect ROM Upon power up the image processor interrogates the 256 byte Serial Presence Detect ROM which describes the DIMM in great detail with details such as data width clock delay number of address columns and row refresh rate and more If the DIMM does not meet the required specifications it will be ignored no error message will be reported With more memory the printer gains the capabilities of printing at higher resolutions printing without having to use image compression which trades off less installed RAM for longer image processing time and dual frame buffers for printing one image while processing a second image which gives greater printing throughput With additional RAM memory the printer s capabilities increase as detailed in the following table Table 1 Memory and features sets Configuration options Standard Graphics Plus printer printer printer w 192 Mbyte w 64 Mbyte w 96 Mbyte RAM R
29. of paper just after the paper exits the fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has visible horizontal band deletions after it exits the fuser If yes replace the fuser roll cartridge Make another test print If the problem still occurs replace the fuser Remove the top cover Turn the carousel frame and inspect the magnet roller of each of the four developer assemblies Do the magnet rollers of each developer assembly appear smooth evenly formed without any low spots and without obvious contamination If not replace the defective developer assembly Replace the high voltage power supply Replace each of the four developer assemblies one at a time Phaser 780 Color Printer Streaks in direction of paper travel Leading Edge There are dark lines running along the page in the direction of paper travel from the leading edge to the trailing edge B size print shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path making horizontal print artifacts parallel to the shot edge of the print In B size prints are processed through the printer with the long edge of the print parallel to the paper path making horizontal artifacts parallel to the long axis of the print 3041 42 1 Inspect the paper path between feed and ex
30. pages per minute Monochrome 8 pages per minute Transparency 1 page per minute Minimum margins 5 mm 0 2 in on all sides except for Tabloid Plus 13 x 19 in media which has a bottom margin of 25 mm 1 in Usable papers sizes Paper Envelope 3 5x5 5 minimum size US 10 8 5x11 Letter Euro Standard 8 5x14 Legal A4 11x17 Tabloid C4 12x18 Tabloid Extra C5 13x19 Tabloid Plus C6 A3 C65 A4 A5 B4 B5 Avery label 5164 5663 7330 7348 Usable paper weights 75 to 105 g m 20 to 24 Ib thru paper tray 64 to 220 g m 80 Ib using the multi purpose tray Tray capacities Main tray Standard paper 250 sheets Transparency 100 sheets Lower feeder trays Standard paper 250 sheets Multi purpose tray Standard paper Letterhead 150 sheets Transparency 50 sheets Label 50 sheets Postcard 75 Envelope 30 Glossy Coated 75 Index 30 Fabric Transfer one ata time Service Guide 15 Table 5 Electrical specifications Characteristic Specification Primary line voltage 100 120 VAC 10 220 240 VAC 1096 Primary voltage frequency 47 to 63 Hz range Power consumption EnergyStar 20 watts Standby 100 watts 1000 watts with fuser on Ready 100 watts 1000 watts with fuser on Printing 1100 watts Table 6 Environmental specifications Characteristic Specification Temperature Operating 0 to 32 C 41 to 90 F Non operating 20 to40 C 4 to 10
31. sensor did not actuate printer within the specified time after the fuser 2 Inspectand clean the exit exit sensor actuated rollers I 3 Testthe media exit sensor 4 Inspect and test the paper feed gear train and paper motor 5 Testthe fuser drive gear train and exit guide 6 Replace the engine control board Media Size The engine control board detected that 1 Set paper tray guides or use Mismatch the paper that was fed into the printer another paper tray was not same size that was detected 2 Inspect the actuators at the by the tray size sensors The registration rear of the paper tray sensor monitors the timing ofthe paper gt paper tray size as itruns through the printer 4 Replace the paper tray size sensor board 5 Replace the engine control board Install Black The black toner cartridge is either not 1 Reseat the black toner Toner installed or not installed correctly The cartridge Power cycle the Cartridge engine control board did not receive a printer signal from the cartridge sensor when 2 Replace the black toner the carousel frame moved the black a te developer housing into position presence sensor 4 Replace the engine control board Install Cyan cyan toner cartridge is either not 1 Reseatthe cyan toner Toner installed or not installed correctly The cartridge Power cycle the Cartridge engine control board did not receive a printer signal from the cartridge sensorwhen 2 Replace t
32. to the rear and remove the chute Reverse these step to install the registration chute Registration chute 780 5 37 Removing the registration chute Service Guide 83 Feeder registration clutch 1 Remove the paper feeder as described in Paper feeder on page 82 2 Turn over the paper feeder and disconnect the wiring harness from the registration clutch 3 Openthe registration chute 4 Remove the E ring securing the registration clutch to the rear of the metal registration roller Remove the registration clutch from the roller Reverse these steps to install the registration clutch Registration clutch Wiring harness 780 5 40 Removing the registration clutch 84 Phaser 780 Color Printer Registration brake clutch 1 Remove the paper feeder as described in Paper feeder on page 82 2 Turn the paper feeder over and disconnect the wiring harness from the registration brake clutch 3 Remove the three screws securing the registration brake clutch assembly to the side of the paper feeder Remove the assembly 4 Remove the E ring securing the registration brake clutch to the clutch shaft and remove the clutch 5 Remove the E ring securing the registration brake gear to the gear shaft Remove the gear Reverse these steps to install the registration brake clutch Registration brake assembly Registration brake clutch N Removing the registration brake clu
33. transfer roller assembly kit 8a 1 Second bias transfer bracket 8b 1 Second bias transfer bearing 6 8c 1 Second bias transfer bearing 4 8d 1 Second bias roller transfer assembly Service Guide 157 780 5 129 Fuser assembly FRUs Phaser 780 Color Printer 158 Table 11 Fuser assembly FRUs Parts Partnumber Serial number Qty Name and description Effective Discont d 1 118 9886 01 1 Fuser 110 VAC 118 9887 01 1 Fuser 220 VAC 2 016 1866 00 1 Fuser roll cartridge 3 118 9986 00 1 Fuser tray release lever 4 118 9727 00 1 Fuser assembly 110V 118 9728 00 Fuser assembly 220V Service Guide 159 Paper exit FRUs Phaser 780 Color Printer 160 Table 12 Paper exit FRUs Parts Partnumber Serial number Qty Name and description Effective Discont d 1 118 9798 00 1 Lower exit assembly 2 118 9799 00 1 Upper exit assembly 3 118 9800 00 1 Exit tray assembly Service Guide 161 780 5 131 Paper exit FRUs 162 Phaser 780 Color Printer Table 13 Paper exit FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9729 00 1 Exit upper roller kit 1a Exit idler gear 1b Exit spur gear 1c Exit rear bearing 1d Exit 3 roller 1e Exit front bearing 1f Exit 2 roller 2 118 9802 00 1 Exit door switch 3 118 9801 00 1 Media exit sensor with flag 4 118 9803 00 1 Fuser fan 5 116 0050 00 1 Full stack senso
34. tray roller assembly 94 Multi purpose tray pick rollers 95 Auto density calibration sensor 97 Developer assembly 99 Developer clutch 101 Developer tie plate 102 Toner developer dispense motor 104 Carousel assembly 105 Carousel motor 107 Carousel motor board 108 Carousel sensor 109 Laser unit 110 Erase lamp rail assembly 112 Eraselamp 114 Process drive unit 115 Waste auger assembly 117 Accumulator belt assembly 119 Accumulator belt cleaner assembly 121 Second bias transfer roller assembly 122 Second bias transfer roller cam assembly 123 Fuser assembly 125 Fuser drive gear train 126 Lower exit assembly 128 Full stack sensor 130 Low voltage power supply 131 High voltage power supply 132 Image processor 133 Image processor chassis 134 Print engine control board 135 Service Guide ix FRU List 137 Supplies and accessories Test Prints 179 Wiring Diagrams 185 X Phaser 780 Color Printer 176 Figures The Phaser 780 printer shown with optional Lower Tray Assembly 1 Internal features of the print engine 5 Circuit boards of the print engine 6 Motors of the print engine 7 Sensors and switches on the print engine 8 Solenoids and clutches on the print engine 9 Features of the image processor board 10 Printer front panel 11 Printer rear panel with the optional Ethernet card 13 Adjusting for impulse banding 75 Removing the paper feeder 82 Removing the registration chute 83 Removing the registration clutch 84
35. voltage power supply P J32 52 Map 6 D607 Process Motor Engine control board P J17 55 Map 7 E708 Dispense Motor Engine control board P J18 56 Map 7 F708 Developer Clutch Engine control board P J19 56A Map 7 F708 P J56 Engine control board P J19 57 Map 5 C509 Accumulator belt Sensor Engine control board P J17 58 Map 7 F708 Carousel Sensor Engine control board P J19 62 Map 8 E812 Cleaner Cam Solenoid Fuser Tray Assembly P J71 62A Map 8 E812 Cleaner Cam Solenoid P J62 Fuser Tray Assembly P J71 63 Map 7 C710 BTR Cam Solenoid Engine control board P J19 63A Map 7 C710 P J63 Engine control board P J19 68 Map 6 B610 B Optional high capacity feeder 68A Map 6 B610 P J68 Option high capacity feeder 69A Map 8 H813 Option high capacity feeder 698 8 H813 Option high capacity feeder 70 Map 7 F711 Fuser Assembly P J71 Low voltage power supply P J32 71 Map 7 F710 Fuser Assembly P J70 71A Map 7 F710 Fuser Tray Assembly P J71 Engine control board P J18 72A Map 8 G812 P J72B Fuser Assembly P J71 72B Map 8 G812 P J72A Temperature Sensor Assembly 73 Map 8 1812 Oil Cam Solenoid P J73A 73A Map 8 1812 P J73 Oil Cam Solenoid Fuser Tray Assembly P J71 74 Map 8 1813 Exchange Solenoid P J74A Service Guide 1 Plug Jack Locations 3 P J Map amp Coordinates Connected to Other end connected to 74A Map 8 1813 P J74 Fuser tray assembly P J71 75 Map 8 H807 Fus
36. 00 000 transfer roller images 3 Replace the engine control board Printer The imaging unit has reached end oflife 1 Replace the imaging unit Maintenance engine control board detected that 2 Replace the engine control Required the drum inside the imaging unit has board Soon exceeded 90 000 revolutions Imaging Unit Life Almost Over Fuser Life The fuser is nearing end of life The 1 Replace the fuser Almost Over engine control board detected thatthe 2 Replace the engine control fuser processed 237 500 images or the board toner dispense motor has accumulated more than 67 036 x 100ms of running time Replace the The imaging unit has reached end of life 1 Replace the imaging unit imaging unit The engine control board detected that 2 Check the connector the imaging unit has printed 110 000 for damage orcontamination images Clean or replace if necessary 3 Replace the engine control board Close Lower The engine control board detected that 1 Close the feeder cover Tray the lower feeder cover interlock switch is 2 Inspect the interlock switch Assembly deactuated Replace if necessary Cover 3 Replace the feeder control board Inspect the lower feeder to printer connections atthe rear of the printer Replace the feeder Replace the engine control board 36 Phaser 780 Color Printer Error code Description Corrective action and message Close Left The engine control board detected tha
37. 08 P J94A P J95A amp P J115 P J110A 111A Map 7 G70 P J111B Engine control board P J17 Map 8 D805 111B Map 8 D806 P J111A Fuser Fan 113A Map 4 E409 Multi purpose tray assembly P J113B Paper feeder P J91 113B Map 4 E409 P J113A Multi purpose tray short no paper sensor P J203 Multi purpose tray clutch P J202A P J202B Pick up solenoid P J201A P J202B 115 Map 4 H408 P J94A amp P J95A Terminated 116 Map 1 H106 P J83A P J116A Waste toner sensor P J88 116A Map 1 H106 P J116 Engine control board P J18 117 Map 5 D507 Fuser In Sensor P J76 121 Map 5 D507 Laser diode assembly Engine control board P J14 P J196 122 Map 5 D506 Laser diode assembly Engine control board P J13 123 Map 5 E506 Laser unit Engine control board P J14 124 Map 5 C506 Star of scan sensor Engine control board P J14 131 Map 6 B610 Option connection not on schematic 131A Map 6 B610 Option connection not on schematic 132 Map 6 B610 Option connection not on schematic 132A Map 6 B610 Option connection not on schematic 161A Map 7 G707 P J161B Engine control board P J17 Map 8 D805 190 Phaser 780 Color Printer Plug Jack Locations 6 P J Map amp Coordinates Connected to Other end connected to 161B Map 8 D805 P J161A Top Exit sensor P J165 Exit Chute switch P J166 163A Map 7 G707 P J163B Engine control board P J17 Map 8 D805 163B Map 8 D805 P J163A Full Stack sensor P J167 165 Map
38. 103 103A 106 106A 101 101A 104 104A 213 3041 11 Map 2 Wire routing around the engine control board Phaser 780 Color Printer 194 xk fe 3041 12 Map 3 Wiring routing around the image processor board Service Guide 94 94A 110A 110B 98 109 109A 113A 113B 92A 92B 207 90A 90B 3041 13 Map 4 Wiring routing around the paper feeder 196 Phaser 780 Color Printer fu ufo 197 197 3041 14 5 Wire routing around the laser scanner and high voltage power supply Service Guide 601 602 603 604 605 606 607 608 609 6 611 612 432 132A 613 131 131A 103A 614 615 3041 15 Map 6 Wire routing at the rear of the printer 198 Phaser 780 Color Printer 1 fs ufo 3041 16 Map 7 Wire routing around the power supply Service Guide y xo 80 80A Te 79 3041 17 Map 8 Wire routing around the fuser 200 Phaser 780 Color Printer ENGINE CONTROL BOARD LOW VOLTAGE POWER SUPPLY FUSER ASSY 24VDC 1 L lt P J12 P J33 8 5V
39. 4 F Storage 20 to40 C 4 to 104 F Humidly Operating 15 to 8596 relative humidity Non operating 5 to 8596 relative humidity Storage 5 to 85 relative humidity Altitude Operating 0 to 3000 m 9900 ft at 25 C Non operating 0 to 15000 m 50 000 ft Vibration Operating Will withstand 0 5G excitation 5 to 100 Hz 3 axes for up to 50 minutes Non operating Shock non operating with no impairment or subsequent damage 0 5 g 25 minute sweep 5 100 Hz 100 200 sec sweep cycles The printer may have any corner raised and dropped 5 cm 2 in without impairment of operation Acoustic Noise Idle Printing 38 3 db 54 8 db with impulse noise of 63 3 db 16 Phaser 780 Color Printer Regulatory specifications Safety m EN60950 CB Report by Third Party GOST and TUV certification m UL1950 Nationally Recognized Test Lab NRTL certified m CSA 950 SCC recognized test lab certified N55022 CISPR 22 Class B N50082 1 1994 Susceptibility N61000 3 2 AC Mains Harmonic Distortion N61000 3 3 AC Mains Voltage Flicker N61000 4 4 1993 Fast Burst Transients N61000 4 5 1993 Line Surge E E E E m EN61000 4 2 1993 ESD E E EN61000 4 11 1993 Voltage Dips and Interruptions E NV50140 1993 Radiated RF Immunity Energy Star certification After 1 hour period of inactivity the printer enters an standby mode as required by Energy Star The wait time is a user definable parameter via the front panel or by using Phaser
40. AM RAM 600 x 600 with fullimage Yes Yes Yes area 600 x 1200 with full No Yes Yes image area Check Print PhaserMatch No No Yes Job Pipelining No No Yes 2 pages Parallel port buffer 256 kbytes 256 kbytes 512 kbytes Print Collation requires No No Yes hard drive option Fonts available 136 136 136 Service Guide 3 Print the Configuration Page and check the item installed RAM to see what type of RAM is installed For example Installed RAM 96 Mbytes Mem slot 1 SDRAM parity 64 MB KMM3665824AT Mem slot 1 empty This is a list of DRAM SIMMs that are branded for use by Tektronix at the time this guide was published Size Maker Part Number 16 Mbyte Samsung KMM3665203BT 32 Mbyte Samsung KMM3665403BT 64 Mbyte Samsung KMM3665824AT 128 Mbyte Samsung KMM36651623AT 32 Mbyte Smart Module SM564043574N6AA 64 Mbyte Smart Module SM564088574N6AA 32 Mbyte NEC MC 454AD645F A10B 64 Mbyte NEC MC 454CB645FA A10B 128 Mbyte NEC MC 4516CD645FZ A10B 16 Mbyte Micron Tech MT8LSDT264AG 66CL2 32 Mbyte Micron Tech MT16LSDT264AG 10BC4 32 Mbyte Micron Tech MT16LSDT264AG 662C1 64 Mbyte Micron Tech MT8LSDT864AG 662D3 64 Mbyte Micron Tech MT8LSDT864AG 10BD2 128 Mbyte Micron Tech MT16LSDT1664AG 662DT 4 Phaser 780 Color Printer Print engine assemblies Developer Laser assemblies unit Carousel assembly Paper lt feeder Fuser 2 AG 5 f S Mult
41. ASSY PL6 1 13 3041 20 Wiring 2 Engine control board auto density calibration sensor erase lamp waste toner sensor 202 Phaser 780 Color Printer ENGINE CONTROL BOARD HIGH VOLTAGE POWER SUPPLY P J42 AG K 14 DTS CONT 13 DTS ON L 24VDC 2 2BTR MONI lt K 11 2BTR CONT 10 2BTR ON L 24VDC gt K 9 1BTR MONI 8 1BTR CONT gt K 7 1BTR ON L 24VDC gt K 6 DB DC CONT gt K 5 DB DC ON L 24VDC gt K 4 DB AC ON L 24VDC BCR DC CONT gt BCR ON L 24VDC gt LOW VOLTAGE POWER SUPPLY 24VDC gt P J41 RIN BIAS CHARGE ROLLER CONNECTOR ASSY DRUM CARTRIDGE Wiring 3 Low voltage power supply engine control board high voltage power supply and imaging components ox ZN NN 1 P JF 1 P J ki A DEVE CONTACT ASSY DEVELOPER ASSY 1ST BIR lt 2ND lt TRANSFER ASSY BIAS TRANSFER ROLLER BIAS PLATE TRANSFER ROLLER PL8 2 13 ACCUMULATOR BELT ASSY SECOND BIAS TRANSFER ROLLER SECOND BIAS TRANSFER ROLLER ASSY AM Detack 2ND BIAS TRANSFER ROLLER CAM ASSY ISZ DTS PLATE 3041 21 DTS Service Guide Wiring 4 Engine control board used cartridge sensor cartridge sensor carousel sensor developer clutch de
42. DC i 1 7 i I 3 tk 2 24006 1 4 SG uSupply 53 55 He 5 56 57 45 58 i P J33 Lo SVDC FRONT COVER 4 273191 SWITCH R 7 5 lt 4 fe SA 9 515 P J192 4 Pi 24VDC 1 L i 24 A 1 P J193 5VDC LD 2 5 RIN K 14 gt K 1 HEATER ON L 5VDC 3 RK 1 3 P J194 4 fX 81 83 5 86 25 5 Power Switch TOP COVER SWITCH 1 2 24 o RTN SCANNER MOTOR ON L 5VDC Karan anus gens tore 2 FRONT FRONT COVER P SWITCH L P J19 SWITCH ON L 5VDC Pa sy FR Wiring 1 Low voltage power supply laser unit and interlock switches 3041 19 Service Guide MCU PWB 5VDC 18 5 5 LED ON L 4 5VDC ADC SIG 21 AG 24VDC 22 ADC SOLENOID ONE 24VDC 19 K 5 20 23 gt ERASE LAMP ON H 5VDC AG WASTE TONER SENSED H 5VDC SVDC A3 0 443 PULL UP 5VDC gt AG 2 5 TONER BOX SENSED L 5VDC AAA 4 1 6 P J F 83A 3 2 2 1 3 WASTE TONER TONER BOX SENSOR SENSOR COMMUNICATION ASSY P J 84A AG K 4 5VDC gt K 3 K 2 K1 CRUM DATA gt lt CRUM CLOCK gt DRUM CARTRIDGE P J85 CRUM
43. Diagnostic tests Test Sub tests Detail Service Print Source Tray 1 Tray 2 Tray 3 Tray 4 MPT Output Right Side Top Cover Media Paper Transparency Label Cover Print Black Grid Color Grid Black Patch Color Patch Paper Path Test Image Processor Kernel DIMMs ROMs 1 0 Engine ROM Revision Service Guide 69 Table 1 Diagnostic tests Test Sub tests Detail Sensors Belt Home Sensor Carousel Home Sensor Waste Cartridge Sensor Waste Cartridge Full Sensor Full Stack Sensor Exit Sensor New Toner Sensor Toner Cartridge Present Sensor Paper Feeder Interlock MPT Long Paper Sense MPT Paper Sensor MPT Edge Sensor Registration Sensor Oil Roller Switch New Oil Roller Switch Fuser Interlock Switch Fuser Entry Sensor Fuser Exit Sensor Front Cover Interlock Lower Feeder Interlock Tray 1 Present Tray 2 Present Tray 3 Present Tray 4 Present Indicates Missing or Size of media selection 70 Phaser 780 Color Printer Table 1 Diagnostic tests Test Sub tests Detail Sensors cont Tray 1 Low Sensor Tray 1 Empty Tray 2 Low Sensor Tray 2 Empty Tray 3 Low Sensor Tray 3 Empty Tray 4 Low Sensor Tray 4 Empty Pass Fail test of sensor and its wiper solenoid for solenoid portion of
44. Error Error 13 There is problem with the auto density calibration The engine control board detected that the auto density calibration sensor LED output signal is below specified range Power cycle the printer Check the auto density calibration sensor for contamination from toner Replace the sensor if necessary Inspect and reseat the auto density calibration sensor Ensure the senor s solenoid activated cleaning blade is in place and moves freely Testthe auto density calibration sensor If bad replace the auto density calibration sensor Replace the engine control board Replace the low voltage power supply Toner Carousel Error Error 21 There is a problem with the carousel home sensor The engine control board detected that the carousel home sensor did not actuate within six seconds after the start of the carousel motor ou Power cycle the printer Manually rotate the carousel assembly several revolutions Check for contamination that may cause binding Testthe carousel home sensor Replace if needed Replace the carousel motor Replace the engine control board PCDC Error Error 22 Environment Sensor Error Error 23 There is a problem with PCDC calibration The engine control board detected that PCDC calibration value is much lower than set specifications There is a problem with the environment sensor circuit The engine contr
45. IN PAPER FINDER ASSY J90 FUSER CHUTE FAN 155 DEVE CLUTCH 1175 388 WASTE TONER SENSOR E 318 FUSER IN SENSOR y FF Sl DEVE FAN 4177 1 076 119 J83 H TONER BOX SENSOR sd cue m o 20 MUTI PURPOSE Frans TONER DISPENSE ENVIRONMENT SENSOR J105 720 1316 jz COMMUNICATION ASSY OHP SENSOR J205 18 55 MOTOR ASSY ENGINE MUTI PURPOSE CAROUSEL SIZE SWITCH ASSY J102 ryg SQNTROL 184 385 ASSY SONG N P SENSOR J206 TJA A 46 8 CAROUSEL J19 MOTOR ASSY MUTI PURPOSE 1208 913 FEED SOLENOID 3105 LHORT N P SENSOR ETH TRAY EMPTY SENSOR MUTI PURPOSE EEIN J63 CAM SOLENOID 1320 PICK UP SOLENOID J107 H J 101 J20 CK UP SOLENO 357 ACCUMULATOR BELT MUTI PURPOSE 12 SENSOR LOW PAPER SENSOR J106 ASSY MSI CLUTCH i jai PAPER FEED 125 MOTOR ASSY J49 6 J104 TOP EXIT SENSOR J165 S461 947 1 1 J161 317 PROCESS MOTOR ASSY J52 151 H T EXIT CHUTE SWITCH AER T ed i arn J11 IMAGE J310 3317 FRONT PANEL FULL STACK SENSOR PROCESSOR pt IMAGE 3314 FUSER FAN jn 118 4 PROCESSOR 3041 09 Print engine wiring diagram Service Guide 1 Plug Jack Locations 1 amp Coordinates Connected to Other end connected to 10 Map 2 D205 Engine control board 11 Map 2 E205 Engine control board Image processor board 12 Map 2 D205 Engine control board Low voltage p
46. Link Energy Star default is ON and the time out default 15 one hour The printer enters a READY condition within 5 minutes after power on Service Guide 17 18 Phaser 780 Color Printer Error Codes and Messages The following table list error codes and messages reported by the print engine control board Error code Description Corrective action and message Laser Unit There is a problem with the laser unit 1 Testthe top cover and right Error The engine control board did not receive front cover switches for Error 10 a signal from the laser start of scan proper operation Power for sensor within the specified time the laser unit is routed through both switches 2 Replace the laser unit 3 Replace the engine control board Image The image density readings indicate a 1 Power cycle the printer Density Error problem The engine control board 2 Inspectthe toner cartridges Error 11 detected that the printer image density 3 Inspect the four developer was unusually low and attempts to raise the density have failed Note If the top cover is removed light can leak into the printer and cause a auto density calibration sensor error housings Each magnetic roller should be evenly Coated with toner Replace a Suspect developer assembly Testthe toner developer dispense motor Replace it if it does not run Inspect and reseatthe auto density calibration Sensor Ensure the senor s solenoi
47. Map 4 E409 Multi purpose tray assembly P J92B Paper feeder P J91 92B Map 4 E409 Multi purpose tray assembly Paper feeder P J92A 93 Map 4 D408 Registration sensor Paper feeder P J91 94 Map 4 F408 Registration clutch P J94A 94A Map 4 F408 P J94 Paper feeder P J110B amp P J115 95 Map 4 G408 Pre Registration clutch P J95A 95A Map 4 G408 P J95 Paper feeder P J110B amp P J115 97 Map 2 F204 Paper feeder P J 91 Front cover switch R P J191 amp P J70 98 Map 4 D409 Front OHP sensor Paper feeder P J91 99 Map 4 E408 Rear OHP sensor Paper feeder P J91 101 Map 2 D212 Tray no paper sensor P J107 P J101A 101A Map 2 D212 P J101 Engine control board P J20 102 Map 7 D711 Size Switch assembly Engine control board P J19 103A Map 2 F206 P J103B Engine control board P J19 103B Map 2 F206 Feed solenoid P J103A 104 Map 2 D212 P J104A Terminated 104A Map 2 D212 P J104 Engine control board P J20 105 Map 2 D205 Environment sensor P J105A 105A Map 2 D205 P J105 Engine control board P J20 106 Map 2 E211 Low Paper sensor P J106A 106A Map 2 E211 P J106 Engine control board P J20 Service Guide 1 Plug Jack Locations 5 P J Map amp Coordinates Connected to Other end connected to 107 Map 2 E213 Tray no paper sensor P J 101 109 Map 4 D409 Registration brake clutch P J109A 109A Map 4 D409 P J109 Paper feeder P J91 110A Map 4 G408 P J110B Paper feeder P J91 110B Map 4 G4
48. N KATSO STR LEN TTELSE FOR FOR STR LEN DIRECTA A TALES R FARLIG S TEESEN STR LING RAYOS PJQT4521ZA 9008 78 Contents General Information 1 Phaser 780 overview 2 Memory considerations 3 Print engine assemblies 5 The image processor 10 Front panel 11 Rear panel 12 Network card LEDs 12 Specifications 14 Regulatory specifications 17 Safety 17 EMC 17 Energy Star certification 17 Error Codes and Messages 19 Troubleshooting 39 System power up sequence 39 Print engine troubleshooting 40 Printer will not power up 40 Erratic printer operation 41 Making a print engine only test print 42 Printing and print quality problems 43 Initial checks and actions 43 Light undertone prints 44 Blank prints 45 Monochrome prints 46 Black prints 47 One color is faded 47 Missing band in direction of paper travel 48 Missing bands in parallel to the leading edge 49 Streaks in direction of paper travel 51 Streaks parallel with the leading edge 52 Banding 53 Edge of print is wrinkled with an area of ragged discoloration 53 Random missing spots 54 Random spotting 55 Repetitive mark appears on each print 56 Residual image or ghosting 56 Background contamination 57 Unfused image or image easily rubs off of page 58 Toner on back of print 58 Service Guide vii Print is mottled 59 Image mis registered on paper 60 Color layer not correctly registered 60 Color representation not correct 61 Oil stain or gloss variation on pri
49. PHASERO 780 COLOR LASER PRINTER Service Quick Reference Guide Warning The following servicing instructions are for use by qualified service personnel only To avoid personal injury do not perform any servicing other than that contained in operating instructions unless you are qualified to do so This printing September 1999 063 3041 01 Tektronix ES Copyright O 1998 by Tektronix Inc Wilsonville Oregon Printed in the United States of America All rights reserved Contents of this publication may not be reproduced in any form without permission of Tektronix Inc Tektronix Phaser and Made for Each Other are registered trademarks of Tektronix Inc TekColor PhaserShare PhaserMatch PhaserLink Finepoint and PhaserPrint are trademarks of Tektronix Inc RealSUPPORT and TekColor Care M are service marks of Tektronix Inc Other marks are trademarks or registered trademarks of the companies with which they are associated October 1998 First Printing December 1998 Changed pages 2 3 15 72 78 92 93 105 108 109 111 113 114 115 117 121 124 127 129 134 137 138 139 140 141 144 145 TE mq mm Users safety summary Terms in CAUTION Conditions that can result in damage to the product manual WARNING Conditions that can result in personal injury or loss of life Power source For 110 VAC printers Do not apply more than 130 volts RMS between the supply conductors or between
50. Plus version Phaser 780 supports image pipelining for greater throughput a print collation mode and a check print before proceeding with job mode The plus printer also feature a SCSI compatible interface to connect to an external hard disk drive for additional font storage The hard disk drive is also required for print collation of multiple copy multi page prints A scanner can also be connected to the Plus printer s SCSI port to give the printer the ability to optically copy color images RAM memory in the printers can be supplemented with one or two additional 32 64 or 128 Mbyte RAM DIMMs the maximum usable capacity is 192 Mbytes Print speeds depend on the chosen resolution and selected media For resolutions of 600 x 600 standard in color the printer prints at 4 A size pages per minute ppm on paper Monochrome printing Fast Monochrome is at 16 ppm on paper Transparency film printing is always 2 ppm The printers support printing on A A4 A5 B B4 B5 SRA3 A3 13 x 19 in and Legal sized paper from a 250 sheet tray An optional three tray second feeder called the Lower Tray Assembly is available with additional 250 sheet standard media trays The printer features a built in multi purpose tray from which specialty media cardstock and envelopes can be fed The printer also supports manual feeding using the multi purpose tray After being idle for the selected amount of time the printer switches into its Energy Star
51. Press the Printer Menu Select button 2 With the Help pages menu displayed scroll to the Demonstration Page item Press Print Service Guide 73 Print engine calibration Generally only one print engine calibration is required Usually if you note a print defect replacing a toner cartridge a developer or the imaging unit or perhaps the paper feeder corrects the problem Adjusting for impulse banding Impulse banding is a print artifact that occurs on prints when the developer roller comes into contact with the drum This adjustment adds shims to the carousel assembly to slightly alter the position of each developer assembly relative to the drum Note The shims used in this adjustment permanently clip into place and can be difficult to remove You should modify a set of shims by cutting the clips off of the shims so they can be inserted and removed easily Once you determine the correct shims required install permanent shims in their place Ensure the printer is in a ready to operate condition Turn off the printer Remove the top cover Fe GR With a pen or marker no pencil scribe a line across the white tracking roller located at the front of the developer roller 5 Position the white roller so the mark is even with the edge of the nearly developer frame 6 Hold the carousel lock so it will not impede the carousel s movement 7 With a slow smooth action rotate the carousel assembly 1809 Do not allow the c
52. RAY L P J91 92A 928 L 105 EDGE PAPER SENSED 1 5VDC A10 6 5VDC 11 5 KM K 5 A MULTI PURPOSE TRAY OHP SENSED L 5VDC H 12 MM Fra NK 4 AG 13 A MULTI PURPOSE TRAY KAZ M3 3 TR LONG PAPER SENSED L 5VDC Kar 2 K 1 A LT e N I a 5VDC P J P J 113A 113B PULL UP 5VDC 32 gt K B7 BE K7 1 gt AG L 33 4 MULTI PURPOSE TRAY ad SHORT PAPER SENSED L 5VDC Kes 810 24VDC E 35 BH kK 4 MULTI PURPOSE TRAY KB4 B11 Ba CLUTCH ON L 24VDC 36 FA K B12 K 345 37 B2 8134 2 6 PICK UP SOLENOID ON L 24VDC 5 B14 KT 75 A FR NR 8 89 1 10 810 MULTI PURPOSE TRAY SHORT N P SENSOR MULTI PURPOSE TRAY CLUTCH MULTI PURPOSE TRAY PICK UP SOLENOID 3041 29 Service Guide ENGINE CONTROL BOARD 5VDC PULL UP 5VDC AG TOP EXIT SENSOR P J165 TOP EXIT PARER SENSED L 5VDC MEDIA EXIT SWITCH ON L 5VDC T CHUTE SWITCH P J166 M FULL STACK SENSOR P J P J 163A 1638 P J167 PULL UP 5VDC gt 4 1 K 3 sed FULL STACK SENSED L 5VDC lt 2 3 K 1 4 FUSER FAN HALF SPEED 24VDC FUSER FAN ON H 24VDC FUSER FAN 3041 30 Wiring 12 Engine control board top exit sensor media exit s
53. ace the power supply Replace the fuser Replace the engine control board Fuser Temperature Error 44 The thermistor sensor indicates that the fuser had reached the set overheat temperature The engine control board has shutdown fuser temperature operation Allow the fuser to cool for 30 minutes Ensure the fuser wiring harnesses are plugged in Check the fuser fan Replace the fuser Replace the engine control board Replace the low voltage power supply Service Guide 23 Error code Description Corrective action and message Process There is a problem with the process 1 Testthe process drive Motor Error motor the engine control board did not assembly Error 61 receive a signal from the accumulator 2 Testthe 24 VDC atP belt home sensor signal in the specified 32 11 and frame ground time 3 Testthe accumulator belt home sensor 4 Replace the process motor 5 Replace the accumulator belt assembly 6 Replace the engine control board 7 Replace the imaging unit Paper There is a problem with the paper feed 1 Power cycle the printer Handling motor The engine control board 2 Replace the paper feed Motor Error received a failed signal from the paper motor Error 62 feed motor circuitry 3 Nang the engine control 4 Check formechanical binding in the paper feed drive gear train Imaging Unit The engine control board detected a 1 Reseatthe imagi
54. and then processing and printing the file Use a text editor to open and examine the file There is a utility file that you can use to tag or remove a CTRL D to the end of a print file TCP IP and Novell protocols do not accept CTRL D with the print files Refer to the network user manual 68 Phaser 780 Color Printer Running built in diagnostics The printer diagnostic interface consists of a front panel containing a 2 line by 40 character LCD display and six buttons For diagnostics the front panel switches are identified as 1 through 6 with switch 1 being the left most switch and switch 6 being the right most switch To place the printer in service diagnostics mode Turn on the printer and wait for a string of to appear on the front panel display as they appear press and hold button 3 for five seconds You select individual test by navigating a tree structure with three buttons defined as Prev Next and Select Help Mode You can enter a Help mode at the top level by pressing Prev or Nest until Help Mode On Off is displayed Once you select Help mode and is displayed on the lower right corner of the display With help mode enabled once you select a test information about the test is displayed in the top line of the display Buttons 3 and 4 are relabeled as Quit and More Pressing More displays additional information about the test Pressing Quit leaves the test description and asks if you want to run the test Table 1
55. any print problems detected Look for voids repeating spots and banding This solid fill is also useful for flushing out defective black toner Service Print 9 Fuser Cleaning Page Service print 9 is a blank sheet of paper used to clean the fuser rollers as well as test the operation of the paper feed components Service Guide 183 184 Phaser 780 Color Printer Wiring Diagrams
56. aper tray s metal hooks at the corners of the leading edge of the paper in the tray are not bent or deformed Feed paper out of each of the available paper feeders Is the paper damaged when fed out of one tray but not when fed out of the others If so inspect the tray for damage and check the paper to ensure it is correct Is the paper damaged when fed out of multi purpose tray Inspect the multi purpose tray for debris or obviously broken components that could be damaging the paper as it feeds out of the assembly and into the printer Inspect the paper feeder for debris or broken components Generate a test print and open the front cover just as the sheet of paper is moving through the registration rollers about 1 second after you hear paper feeding start Carefully slide the paper feeder out of the printer and inspect the sheet of paper Is the sheet of paper undamaged as it leaves the registration rollers If yes replace the metal registration roller and the rubber registration roller Generate a test print and open the front cover just before the sheet of paper reaches the fuser Open the front cover and inspect the sheet of paper Is the sheet of paper undamaged as it leaves the second bias transfer roller If yes replace the second bias transfer roller Generate a test print and open the front cover just as the sheet of paper exits the fuser Inspect the sheet of paper Is the sheet of paper damaged as it exits the fuser If y
57. arousel to stop as the developer pass the drum surface Continue rotating the carousel to bring the marked developer to its starting position 8 Asthe developer roller contacts and passes the drum surface the developer should rotate about 2 mm Too much rotation caused by the roller contacting the drum too soon causes impulse banding Inspect the white tracking roller for movement If the mark is within 2 mm of its original position no adjustment is needed If the mark is rotated beyond 2 mm a shim is required 9 Generally a 1 mm shim usually corrects impulse banding Install a shim in the side of the carousel assembly for the developer being tested 10 Repeat the procedure from Step 5 until the rotation is about 2 mm If rotation is not enough use a smaller shim Too much use a larger shim 11 Repeat for each developer 74 Phaser 780 Color Printer E Developer roller Place mark on white roller After carousel rotation mark should move 2mm Install shim gt lt Lift up slightly to install shim 3041 32 Adjusting for impulse banding Service Guide 75 76 Phaser 780 Color Printer Cleaning and Maintenance Service preventive maintenance procedure Whenever you check service or repair a printer you should perform the following procedures Cleaning the printer as outlined in the following steps assures proper operation of the printer and reduces the probability of having to se
58. ches securing the full stack sensor to the bracket 3 Disconnect the sensor s connector P J 167 Reverse these steps to install the full stack sensor Full stack sensor N V N AAN NN NNN 780 5 158 Removing the stack full sensor 130 Phaser 780 Color Printer Low voltage power supply 1 Remove the rear cover 2 Disconnect the wiring harness from the top of the low voltage power supply All the wiring harnesses plugs are held in place with locking levers 3 Disconnect the remaining wiring harnesses from the low voltage power supply 4 Release the wiring harness from the wire clip located at the top left of the low voltage power supply 5 Remove the four screws securing the low voltage power supply to the printer frame Lift and remove the low voltage power supply from the printer frame Reverse these steps to install the low voltage power supply Printer frame Wiring harness Low voltage d power supply 780 5 83 Removing the low voltage power supply Service Guide 131 High voltage power supply 1 Remove the rear cover 2 Disconnect the wiring harnesses from the bottom of the high voltage power supply 3 Disconnect the five high voltage wiring harness from the high voltage power supply 4 Remove the four screws securing the high voltage power supply to the high voltage power supply brackets Remove the high voltage power supply Reverse the
59. cover just as the sheet of paper exits the fuser Slide the fuser out of the printer and inspect the back of the sheet of paper Is the back of the sheet of paper clean and free of toner when it exits the fuser If not clean the fuser rollers by processing 10 sheets of B size paper through the printer or replace the fuser Generate a test print and open the upper exit cover just as the sheet of paper reaches exit roller Inspect the back of the sheet of paper Is the back of the sheet of paper clean and free of toner as it nears the exit roller If not clean or replace the upper exit assembly Print is mottled The printed image has a mottled appearance 1 Ensure good quality laser paper is being used 2 Check the media settings at the printer driver and at the front panel default settings for media size and type 3 Does mottling occur on only one and inspect the magnetic rollers of the affected color s developer assembly Ensure there is no buildup Replace the developer if necessary 4 PrintService Print 2 and open the front cover just before the sheet of media exits the fuser Remove the 3041 58 imaging unit and inspect the image on the drum Is there a normal image without mottling If not replace the imaging unit Inspect the image on the accumulator belt Is there a normal image without mottling on the belt If not replace the accumulator belt assembly Print a test print and open
60. ct is dropped or damaged if you suspect that the product needs servicing or repair and whenever you clean the product Ground the product Plug the three wire power cord with grounding prong into grounded AC outlets only If necessary contact a licensed electrician to install a properly grounded outlet Symbols as marked on product DANGER high voltage Protective ground earth terminal Use caution Refer to the manual s for information gt Laser use caution Refer to the manual s for information gt WARNING If the product loses the ground connection usage of knobs and controls and other conductive parts can cause an electrical shock Electrical product may be hazardous if misused Service safety summary For qualified service personnel only Refer also to the preceding Users Safety Summary Do not service alone Do not perform internal service or adjustment of this product unless another person capable of rendering first aid or resuscitation is present Use care when servicing with power on Dangerous voltages may exist at several points in this product To avoid personal injury do not touch exposed connections and components while power is on Disconnect power before removing the power supply shield soldering or replacing components Do not wear jewelry Remove jewelry prior to servicing Rings necklaces and other metallic objects could come into contact with dangerous voltages and cur
61. d activated cleaning blade is in place and moves freely Test the auto density calibration sensor If bad replace the auto density calibration sensor Replace the imaging unit Replace the engine control board Replace the high voltage board Service Guide 19 Error code Description Corrective action and message mage The image density readings indicate a 1 Power cycle the printer Density Error Error 12 problem The engine control board detected that the printer image density was unusually high and attempts to lower the density have failed 9 Ensure the toner cartridges are fully functional and relatively full of toner Testthe toner dispense motor Check the auto density calibration sensor for contamination from toner Replace the sensor if necessary Inspect and reseat the auto density calibration Sensor Ensure the senor s solenoid activated cleaning blade is in place and moves freely Test the auto density calibration sensor If bad replace the auto density calibration sensor Replace the engine control board Inspectthe four developer housings Each magnet roller should be evenly Coated with toner Replace a suspectdeveloper assembly Replace the imaging unit 10 Replace the high voltage board 20 Phaser 780 Color Printer Error code and message Description Corrective action Auto density Calibration
62. d components as they become available It is important when ordering parts to include the following information Components part number m Product type or model number B Serial number of the printer Serial numbering Particular fields in the serial number indicate the modification level of the printer the date of its manufacture and the sequence number of the printer produced on that day The serial number is coded as follows JLXXDMY J indicates the headquarter country of the manufacturing company Japan L indicates the modification level of the printer ranging alpha numerically from 0 to Z XX alpha numerically indicates the sequence of the printer among the printers produce on that day of manufacture ranging from 01 to ZZ representing 1 to 1296 the letters I and O are not used D alpha numerically indicates the day of manufacture ranging from 1 to X representing 1 to 31 the letters I and O are not used alpha numerically indicates the month of manufacture ranging from 1 to C representing 1 to 12 Y numerically indicates the last digit of the year of manufacture ranging from 0 to 9 Service Guide 137 Z780 5 119 Printer cabinet FRUs 138 Phaser 780 Color Printer Table 1 Printer cover FRUs Parts Partnumber Serial number Qty Name and description Effective Discont d 1 118 9714 00 Front cover assembly kit 1a Front cover 1b Hinge plate 1c Front cover strap
63. d description 063 3040 20 User Guide Italian 063 3040 30 User Guide German 063 3040 40 User Guide Spanish 063 3040 05 User Guide Russian 063 3041 00 Quick Reference Guide Service 063 3094 00 Setup Guide English 063 3094 10 Setup Guide French 063 3094 20 Setup Guide Italian 063 3094 30 Setup Guide German 063 3094 40 Setup Guide Spanish 063 3094 05 Setup Guide Russian 063 3116 00 Phasershare Setup Guide 063 3116 10 Phasershare Setup Guide French 063 3116 20 Phasershare Setup Guide Italian 063 3116 30 Phasershare Setup Guide German 063 3116 40 Phasershare Setup Guide Spanish 063 3126 00 CD Adobe Type Manager 063 3181 00 CD Phaser Match Color Match 070 9925 00 Advanced Features amp Troubleshooting English 161 0066 00 Power Cord 115v 161 0066 09 Power Cord 220v 161 0066 10 Power Cord U K 161 0066 11 Power Cord Aust 161 0154 00 Power Cord Swiss 161 0240 00 Power Cord Danish 436 0366 00 Universal Size Paper Tray Std 436 0368 00 Labels amp Transparency Tray 013 0297 00 Cable Adapter SCSI 1 TO SCSI 2 118 9921 00 Hardware Kit 116 0073 00 Developer shim kit 4 sets of 3 sizes 003 0619 00 I C Extractor SCSI Board removal tool Service Guide 177 Table 20 Supplies and accessories Parts Partnumber Serial number Qty Name and description Effective Discont d
64. e sensor carousel sensor developer clutch developer fan toner dispense motor 204 Wiring 5 Engine control board low voltage power supply carousel motor board rotary motor 205 Wiring 6 Engine control board low voltage power supply bias transfer roller cam solenoid accumulator belt sensor paper feeder motor process motor 206 Wiring 7 Engine control board low voltage power supply fuser oil roll assembly 207 Wiring 8 Engine control board fuser assembly environment sensor 208 Wiring 9 Engine control board paper size switch board feed solenoid no paper sensor low paper sensor 209 Wiring 10 Engine control board paper feeder 210 Wiring 11 Engine control board paper feeder multi purpose tray 211 Wiring 12 Engine control board top exit sensor media exit switch full stack sensor fuser fan 212 Wiring 13 Engine control board image processor board front panel image processor fan 213 Wiring 14 Lower Tray Assembly master wiring diagram 214 8 y y 5 diag Wiring 15 Engine control board and low voltage power supply to Lower Tray Assembly feeder board 215 Wiring 16 Lower Tray Assembly feeder board to feeder chute switch size switches and feeder motor 216 Wiring 17 Lower Tray Assembly feeder board to no paper sensors and low paper sensors 217 Wiring 18 Lower Tray Assembly feeder board to feed solenoids and turn chutes 218 Service Guide xiii Tables Memory and featu
65. ed 3 Replace the engine control exceeds the design specification for total board image density The specification is 280 or less image density For example a density setting of 100 for each of the four colors creates a layered four color image with a combined density of 400 Replace The fuser oil roll has reached end of life 1 Replace the fuser roll Fuser Roll The engine control board detected that cartridge Cartridge the fuser oil roll has processed the 2 Power cycle the printer equivalent of 20 000 sheets of paper 3 Ensure the fuser connectors since it was installed are properly seated 4 Testthe fuser using internal diagnostics 5 Replace the engine control board Waste The waste cartridge is full The engine 1 Replace the waste cartridge Cartridge control board detected that the waste 2 Testthe waste cartridge full Full cartridge sensor was on for 1250 print sensor using internal cycles diagnostics 3 Inspect the electrical contacts and wiring Replace the waste cartridge full Sensor 4 Replace the engine control board Replace Black image density is too low The 1 Replace the black toner Black Toner engine control board detected that cartridge Cartridge auto density calibration sensor reads 2 Testthe toner developer the black patch density as being below specification and that the reading is either slow to raise or does not raise after the printer attempts to increase density dispense motor Testthe auto den
66. either supply conductor and ground Use only the specified power cord and connector For 220 VAC printers Do not apply more than 250 volts RMS between the supply conductors or between either supply conductor and ground Use only the specified power cord and connector Refer to a qualified service technician for changes to the cord or connector Operation of product Avoid electric shock by contacting a qualified service technician to replace fuses inside the product Do not operate without the covers and panels properly installed Do not operate in an atmosphere of explosive gases WARNING Turning the power off using the On Off switch does not de energize the printer You must remove the power cord to disconnect the printer from the mains Keep the power cord accessible for removal in case of an emergency Safety instructions Read all installation instructions carefully before you plug the product into a power source Terms on CAUTION A personal injury hazard exists that may not be product apparent For example a panel may cover the hazardous area Also applies to a hazard to property including the product itself DANGER A personal injury hazard exists in the area where you see the sign Care of product Disconnect the power plug by pulling the plug not the cord Disconnect the power plug if the power cord or plug is frayed or otherwise damaged if you spill anything into the case if product is exposed to any excess moisture if produ
67. en lit Note Do not use both Ethernet connectors at the same time With a Ethernet or Token Ring network card installed the 10baseT port is disabled 12 Phaser 780 Color Printer The Token Ring network card has two LED indicators Connection yellow off when the printer is not inserted into the Token Ring blinks while the printer is attempting to insert itself into the Token Ring on when the printer is properly inserted in the ring W RingSpeed green off when the card is set for 4 megabits per second MBPS on when the card is set for 16 MBPS B When both LEDs blink a network card failure has occurred The following figure illustrates the rear panel of the printer SCSI port Parallel port 10 base T ethernet port Slot for network card amp IDE hard drive ies SO ORX m neset 000 558 00000 210000 100 HO tink Orr on Om 1 PhaserShare SeriesB Ethernet Card PhaserShare Series B LocalTalk Card O Ethernet LocalTalk Token Ring Internal card card card hard drive 3041 08 Printer rear panel with the optional Ethernet card Service Guide 13 Specifications Table 1 Physical dimensions of printer Dimension Value Height 49 2 cm 19 in without lower tray feeder 90 6 36 in with lower tray feeder Width 69 1 cm 27 2 in Depth 64 1 cm 24 2 in Weight 73 6 kg 161 Ibs with consumables instal
68. er cam guides properly If not replace the fuser assembly 4 Replace the accumulator belt cleaner 46 Phaser 780 Color Printer Black prints The entire image area is black The 6 T printer displays no error code 1 Power cycle the printer if an error 10 is detected replace the laser scanner unit Replace the engine control board Print Service Test Print 1 Is the test print completely black If no reload the printer driver software or replace the image processor board Generate a test print and open the front door just before the sheet of paper enters the fuser Remove the imaging unit Inspect the image on the drum Is there a developed test print image visible on the drum If no replace the imaging unit 8 Generate a test print Is the test print black Replace the high voltage power supply One color is faded 3041 39 Toner cartridge is depleted or the toner developer is defective 1 Replace the defective toner cartridge 2 Replace the toner developer of the defective color Service Guide 47 Missing band in direction of paper travel Leading Edge There are areas of the image that are extremely light or are missing entirely These missing areas form wide bands that run along the page from leading edge to trailing edge in the direction of paper travel B size print shown The printer displays no error code Note A size prints are proc
69. er exit sensor Fuser assembly P J72B 76 Map 8 F813 P J117 fuser entry sensor Fuser assembly P J76A 76A Map 8 F813 P J76 Fuser tray assembly P J71 77 Map 8 G808 CRU switch assembly Fuser assembly P J77A 77A Map 8 G808 P J77 Fuser assembly P J71 78A Map 8 1813 P J78B Fuser assembly P J71 78B Map 8 1813 P J78A Loop 79 Map 8 F812 Pressure roller heat rod Fuser assembly P J71 80 Map 8 D813 Fuser chute fan Fuser tray assembly P J80A 80A Map 8 D813 P J80 Fuser tray assembly P J71 81 Map 1 C110 Auto density calibration sensor P J81A assembly 81A Map 1 C110 P J81 Engine control board P J17 82 Map 6 G608 Developer Fan P J82A 82A Map 6 G608 P J82A Engine control board P J17 83 Map 1 G106 Toner box sensor P J83A 83A Map 1 G106 P J83 P J116 84 Map 1 1107 CRUM assembly P J85 P J84A 84A Map 1 1107 P J84A Engine control board P J16 85 Map 1 H107 CRUM assembly P J84 86 Map 1 1105 Erase lamp P J86A 86A Map 1 1105 P J86A Engine control board P J17 87 Map 5 1506 Used cartridge sensor Engine control board P J17 88 Map 1 F106 Waste toner sensor P J116 89 Map 8 D805 Cartridge sensor P J168 P J89A 89A Map 8 D805 P J89 P J161B 188 Phaser 780 Color Printer Plug Jack Locations 4 P J Map amp Coordinates Connected to Other end connected to 90A Map 4 G409 P J90B Paper feeder P J91 90B Map 4 G409 P J90A Loop 91 Map 2 D211 Paper feeder Engine control board P J20 Map 4 E408 92A
70. er front panel Service Guide 11 Rear panel Connectors The rear panel of the printer features the host interface connectors Bi directional parallel high density connector m Twisted Pair 10baseT Ethernet connector RX indicator green blinks while the network card is receiving data The LED is off steady while no data is being received If the LED is on steady then a problem probably hardware has occurred at the network hub m SCSIhigh density connector external hard disk drive or optical scanner only With the addition of a network card the printer can feature either of these groups of connectors m ThinNet 100base2 and Twisted Pair 100baseT Ethernet connectors This is Option P1 LocalTalk connector This is Option P3 Unshielded Twisted Pair 10baseT and shielded Twisted Pair DB 9 Token Ring connectors This is Option P4 Network card LEDs The Ethernet network card has four LED indicators m TXindicator yellow blinks while data is transmitted to the host The LED is off while no data is being sent m Twisted Pair 100baseT and ThinNet 100base2 RX indicator green blinks while the network card is receiving data The LED is off steady while no data is being received If the LED is on steady then a problem probably hardware has occurred at the network hub TP Link On steady indicates good circuit to nearest port off indicates no circuit m 100 MBS Ethernet speed is 100 MBS wh
71. es replace the fuser Generate a test print and open the upper exit cover just as the sheet of paper reaches exit roller Inspect the sheet of paper Is the sheet of paper undamaged as it nears exit roller If no clean or replace the lower exit assembly and the upper exit assembly Is the sheet of paper undamaged until it reaches exit roller If yes replace exit roller Phaser 780 Color Printer Inoperative lower tray feeder The lower tray feeder does not work at all the lower tray feeder does not attempt to feed paper and the problem is not identified by a displayed error code 1 Ensure the printer driver is configured with the optional trays installed Try printing using a different application program Try printing using a different printer driver Try printing from another computer gu c Pm Check the wire harness that is running between the paper feeder circuit board to the engine control board Ensure the wire harnesses are connected to P J131 and 132 on the lower feeder circuit interface board 6 Generate test prints from Tray 2 Tray 3 and Tray 4 Does the printer generate a test print from any of the lower feeder trays If no go to Step 10 7 Remove the lower feeder rear cover 8 Measure the voltage between P J133 B5 and frame ground on the lower feeder circuit board Is there 5VDC between P 133 B5 and frame ground on the lower feeder circuit board If not verify that 5 VDC on P33 10 the low voltage po
72. essed through the printer with the short edge of the print parallel to the direction of the paper path making print artifacts parallel to the short edge of the print In B size prints are processed through the printer with the long edge of the print parallel to the paper path making artifacts parallel to the long axis of the print 3041 40 1 Is the paper wrinkled dimpled or show any signs of having a high moisture content Load fresh dry paper 2 PrintService Print 1 Do the bands appear in all four colors If yes go to Step 3 If not go to Step 7 3 Remove the imaging unit Inspect the empty cavity for a scrap of paper or a toner blotch that could be blocking the laser window 4 Generate a test print and open the front cover just before the sheet of paper enters the fuser 5 Remove the imaging unit Inspect the image on the drum Is there a normal test print image without any vertical band deletions visible on the drum If yes go to Step 9 If no go to Step 7 7 Remove the top cover Turn the carousel frame and inspect the magnetic rollers of each of the four developer assemblies Do the magnetic rollers of each developer assembly appear smooth evenly formed without any low spots and without obvious contamination If yes replace the imaging unit If not replace the faulty developer assembly 9 Inspect the image on the surface of the accumulator belt Is there a normal test image without a
73. g unit Inspect the image on the drum Is there an image visible on the drum If not make an engine only test print If a test print is printed replace the image processor board If not replace the imaging unit 7 Generate a test print Is the test print blank If yes replace the high voltage power supply 8 Inspect the image on the surface of the accumulator belt Is there an image visible on the surface of the accumulator belt If yes replace the second bias transfer roller If not replace the accumulator belt 9 Replace the engine control board Service Guide 45 Monochrome prints 3041 38 No color is present in a color print only the black layer is printed The printer displays no error code In some cases depending on the nature of the failure only a portion of the print may be monochrome while the remainder of the print is in color 1 Check the accumulator belt cleaner for correct installation The cleaning blade may be in constant contact with the accumulator belt scraping off each layer of color toner soon after it is transferred 2 Inspectthe cleaner cam guides and holders located at the front and back of the fuser assembly Are the cleaner cam holders seated properly If not reseat them as necessary 3 Manually actuate the cleaner cam solenoid and rotate the fuser input gear to cycle the cleaner cam through its cycle of operation Does the cleaner cam operate the clean
74. he E ring and front bearing securing the front of the feeder registration shaft to the paper feeder frame 5 Remove the F ring and rear bearing securing the idler gear to the rear of the feeder pre registration shaft Remove the idler gear 6 Liftthe pre registration roller up 7 Slide the feeder pre registration roller to the rear of the paper feeder freeing the front of the shaft from front of the paper feeder 8 Slide the feeder pre registration roller to the front free the rear of the shaft from the rear of the paper feeder 9 Slide the feeder pre registration roller free of feeder pre registration gear 2 Remove the shaft Note For reassembly ensure the shaft pin lines up with the slot in pre registration gear 2 Service Guide 89 Idler gear Pre registration knob Out holder 780 5 38 Removing the feeder pre registration roller 90 Phaser 780 Color Printer Paper pick turn roller 1 2 3 Remove Tray 1 from the printer Remove the paper feeder Remove the two screws securing the turn chute to the printer frame Remove the turn chute Remove the paper pick turn chute Remove the two screws securing the tray stopper to the printer frame Remove the stopper Remove the E ring securing the front of the turn roller shaft to the front bearing Disconnect the turn arm spring from the printer frame Remove the E ring securing the round cover over the turn arm gear Remove the cover Slide t
75. he cyan toner cartridge the carousel frame moved the cyan developer housing into position 3 Replace the toner cartridge presence sensor 32 Phaser 780 Color Printer Error code and message Description Corrective action Install Magenta Toner Cartridge Install Yellow Toner Cartridge Install Waste Cartridge The magenta toner cartridge is either not installed or not installed correctly The engine control board did not receive a signal from the cartridge sensor when the carousel frame moved the magenta developer housing into position The yellow toner cartridge is either not installed or not installed correctly The engine control board did not receive a signal from the cartridge sensor when the carousel frame moved the yellow developer housing into position The waste toner box is not installed The engine control board detected thatthe waste toner box sensor was deactuated Reseat magenta toner cartridge Power cycle the printer Replace the magenta toner cartridge Replace the toner cartridge presence sensor Reseat the yellow toner cartridge Power cycle the printer Replace the yellow toner cartridge Replace the toner cartridge presence sensor Replace the engine control board Reseat waste cartridge Power cycle the printer Testthe waste toner sensor Check the sensor wiring Replace the sensor Replace the engi
76. he paper feeder 2 Testthe accumulator belt home sensor Replace it if necessary 3 Replace the engine control board 4 Replace the image processor 5 Replace the accumulator belt assembly Color representation not correct The color of the printed image is completely different than the computer image The printer displays no error code 1 Ensure driver settings are correct Reload the printer driver software 2 Clean and inspect the auto density calibration sensor Test the sensor using the printer s built in diagnostics 3 Replace the image processor 4 Replace the engine control board 5 Replace the carousel home sensor 3041 56 Oil stain or gloss variation on print 3041 57 Variations in glossiness in solid fills may occur near the oil roll cartridge end of life or with printers running excessively high daily print volumes If the customer is consistently running a high volume of prints per day they should user the high capacity fuser roll cartridge 1 Anoilstain may occur on first print after the printer has been idle for an extended period If the problem persists on sucessive prints replace the oil roll cartridge Look for excessive oil around the fuser 2 Check the media in the tray Try new media 3 Glossiness variations in solid fills may occur near the oil roll cartridge end of life or with printers running high daily print volumes On coated paper a
77. he rear of the turn roller shaft out of the turn arm assembly Slide the front of the turn roll shaft out of the front bearing Remove the turn roller Turn roller Front bearing Turn chute Go lt Pd RS 780 5 14 Removing the paper pick turn roller Service Guide 91 Paper feed drive gear train 1 Remove the high voltage poser supply as described in High voltage power supply on page 132 2 Slide the paper feeder out of the printer 3 Remove the screw securing the wire clip to the paper feed drive gear train Move the clip and harness out of the way 4 Remove the five screws securing the paper feed drive gear train to the printer frame Remove the gear train 5 Remove the two wire clamps from the paper feed drive gear train Reverse these steps to install the paper feed drive gear train Wire clip Paper feed drive gear train Removing the paper feed drive gear train 780 5 73 92 Phaser 780 Color Printer Paper feed motor 1 Remove the rear cover 2 Disconnect the wiring harness from the paper feed motor 3 Remove the four screws securing the paper feed motor to the fuser drive gear train Remove the motor 4 Remove the two motor supports Reverse these steps to install the paper feed motor II Y Paper feed motor Motor supports Removing the paper feed motor I Wiring harness 780 5 75 Service Guide 93 Mu
78. i purpose tray Accumulator belt cleaner Imaging unit Second bias transfer roller Accumulator belt assembly 3041 02 Internal features of the print engine Service Guide 5 Image processor board Carousel AM motor board Low Voltage Nemo High Voltage Power Supply LVPS board 3041 04 Circuit boards of the print engine 6 Phaser 780 Color Printer Image processor fan Toner 5 Process drive assembly dispanse ML motor Fuser fan Carousel motor Paper feed drive gear train Process Paper feed motor motor 3041 03 Motors of the print engine Service Guide 7 Exit sensor Top cover Exit door switch Sensor Auto density calibration Used toner sensor cartridge sensor Full stack sensor Left front cover switch Toner cartridge presence 22 sensor tad Fuser Fuser exit sensor Environment Carousel sensor Right front cover switch Waste cartridge full sensor Waste cartridge sensor Accumulator belt home sensor Paper size sensor tray paper present sensor Long paper sensor sensor Low paper sensor Registration L Paper empty Sensor Sensors and switches on the print engine 8 Phaser 780 Color Printer Sensor 3041 05 Registration clutch Second bias transfer roller solenoid Developer clutch P Pre Registration clutch
79. idge of the developer assembly to be removed Remove the imaging unit Remove the top cover and inner cover Remove the screw securing the carousel latch to the front of the printer frame Remove the latch Turn the carousel knob until the large shoulder screw securing the desired developer assembly to the carousel frame appears through the access hole a few inches above the carousel knob Remove the shoulder screw securing the developer assembly to the carousel frame Keep the carousel in this position Reach in through the top of the printer slide the developer assembly to the front of the printer to free the gears at the rear of the developer assembly Lift the front of the developer assembly to free the front of the assembly from the front of the printer frame Remove the assembly Each developer is keyed to its position in the carousel Service Guide 99 NS Carousel latch N Shoulder screw ai B 0 Remove shipping ZI developer cover a before installing new developer assembly Removing a developer assembly 100 Phaser 780 Color Printer Oy P 780 5 53 Developer clutch 1 Remove the carousel motor board as described in Carousel motor board on page 108 2 Disconnect the wiring harness from the developer clutch 3 Remove the fuser drive train gear as described in Fuser drive gear train on page 126 4 Remove the four screws securing the developer clutch to the
80. ing the image processor chassis 134 Removing the print engine control board 135 Printer cabinet FRUs 138 Paper feeder FRUs 140 Multi purpose tray cover FRUs 142 Multi purpose tray FRUs 144 Paper feeder cover FRUs 146 Paper feeder FRUs 148 Imaging FRUs 150 Developer FRUs 152 Carousel FRUs 154 Accumulator belt assembly FRUs 156 Fuser assembly FRUs 158 Paper exit FRUs 160 Paper exit FRUs 162 Drive FRUs 164 Electronic rear FRUs 166 Electronics front FRUs 168 Image processor FRUs 170 Optional lower feeder cabinet FRUs 172 Optional Feeder FRUs 174 Print engine wiring diagram 185 Map 1 Wiring routing at the top and front of the printer 193 Map 2 Wire routing around the engine control board 194 Map 3 Wiring routing around the image processor board 195 Map 4 Wiring routing around the paper feeder 196 Map 5 Wire routing around the laser scanner and high voltage power supply 197 Map 6 Wire routing at the rear of the printer 198 Map 7 Wire routing around the power supply 199 Map 8 Wire routing around the fuser 200 Wiring 1 Low voltage power supply laser unit and interlock switches 201 Wiring 2 Engine control board auto density calibration sensor erase lamp waste toner sensor 202 Wiring 3 Low voltage power supply engine control board high voltage power supply and imaging components 203 xii Phaser 780 Color Printer Wiring 4 Engine control board used cartridge sensor cartridg
81. it for contamination or obstructions Is the paper path free of contamination or obstructions 2 Check for dirty fuser guide rollers Also look for toner contamination on the fuser s temperature sensor 3 Print Service Print 4 and open the front cover just before the sheet of paper enters the fuser 4 Remove the imaging unit 5 Inspect the image on the drum Is there a normal test print image without any streaks visible on the drum If yes go to Step 6 If not replace the imaging unit 6 Inspect the image on the surface of the accumulator belt Is there a normal test print image without any streaks visible on the surface of the accumulator belt If no replace the accumulator belt If yes inspect the accumulator belt cleaner s plastic shield for damage replace the belt cleaner if necessary Replace the second bias transfer roller 7 Generate a test print and open the front cover just as the sheet of paper exits the fuser 8 Inspect the image on the sheet of paper just after the paper exits the fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has visible streaks after it exits the fuser If yes replace the fuser roll cartridge If streaks continue to occur replace the fuser 9 Remove the top cover Service Guide 51 10 11 Turn the carousel frame and inspect the magnet roller of each of the four developer assemblies Do the magnet rollers of each develo
82. l Time Clock 11 156 4768 00 1 NVRAM 12 163 1148 00 1 Boot ROM Product ID Service Guide 171 780 5 136 Optional lower feeder cabinet FRUs Phaser 780 Color Printer 172 Table 18 Optional lower feeder cabinet FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9923 00 1 Lower feeder front cover 2 118 9926 00 1 Lower feeder left cover 3 118 9924 00 1 Lower feeder rear cover 4 118 9925 00 1 Lower feeder harness cover 5 118 9928 00 1 Lower feeder chute assembly 6 118 9929 00 1 Lower feeder chute support 7 118 9927 00 1 Lower feeder right cover 8 118 9930 00 1 Lower feeder caster Service Guide 173 10 Items 1 thru 9 780 5 137 Optional Feeder FRUs Phaser 780 Color Printer 174 Table 19 Optional feeder FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9931 00 1 Lower feeder assembly 2 118 9934 00 1 Lower feeder gear assembly 3 118 9933 00 1 Lower feeder motor 4 118 9936 00 1 Lower feeder interface harness 5 118 9935 00 1 Lower feeder circuit board 6 118 9747 00 Lower feeder paper size sensor 7 118 9932 00 1 Lower feeder turn in chute 8 118 9985 00 1 Tray spacer 9 118 9802 00 1 Lower feeder chute switch 10 436 0367 00 1 Lower tray assembly optional feeder Service Guide 175 Supplies and accessories Table 20 Supplies and accessories
83. l the multi purpose tray pick rollers Note the arrows molded into the sides of the pick roller ensure they are oriented the correct direction upon installation Pick up rollers Printer front Rear core rollers 780 5 26 Removing the multi purpose tray pick rollers 96 Phaser 780 Color Printer Auto density calibration sensor Caution Protect the accumulator belt with a sheet of paper 1 2 5 Remove the imaging unit Remove the inner cover Disconnect the wiring harness from the auto density calibration sensor Remove the E ring securing the front of the auto density calibration sensor to the front of the printer frame Reach inside the printer cavity and slide the front end of the auto density calibration sensor out of the hole at the front of the printer Pull the wiring harness out through the grommet hole Caution Do not touch or scratch the accumulator belt when removing the 6 auto density calibration sensor Lift the rear end of the auto density calibration sensor out of the cutout at the rear of the printer Remove the sensor For reassembly ensure the rear of the sensor is fully installed in the rear cutout Service Guide 97 Rear cutout lt S Zn NN Auto density calibration sensor Removing the auto density calibration sensor 780 5 48 98 Phaser 780 Color Printer Developer assembly 1 Open the front cover Remove the toner cartr
84. lace your finger inside the auger opening and feel the movement of the auger spring Does the auger spring rotate when you manually rotate the paper feed motor If not replace the auger assembly Replace the imaging unit Service Guide 55 Repetitive mark appears on each print 3041 48 An identical mark or image appears on each or every other printed image 1 If spots repeat every 264 mm 10 4 in or appear to move in the direction of paper travel from print to print replace the imaging unit If a defect repeats in exactly the same place on successive prints replace the accumulator belt assembly If a problem repeats every 117 mm 4 5 in replace the fuser If a problem repeats every 107 mm 425 in replace the fuser roll cartridge An 88 mm 3 5 in smear may occur on the first print made after a new imaging unit is installed due to the misalignment of the imaging unit s gear teeth with its drive gear Once printing starts the teeth will mesh properly and the problem will disappear A defect every 58 mm 2 5 in or less is related to the feed or exit rollers Residual image or ghosting 3041 49 5 56 There are faint ghostly images appearing on the page The images may be either from a previous page or from the page currently being printed The printer displays no error code 1 Was the customer printing numerous copies of the same image Avoid printing numerous copies of
85. laser continuous tone print engine with an image processor supporting Adobe s PostScript 3 page description language The image processor features a bi directional parallel interface and a 10baseT Ethernet port for host communication Optional network adapter cards to the image processor allow the printer to communicate on networks using LocalTalk Ethernet 100baseT or Token Ring protocols The Ethernet network card supports EtherTalk 100baseT Novell and TCP IP With the Token Ring network card the printer supports Token Ring protocols The network cards are sometimes referred to as smart cards because each houses its own processor for executing specific on board protocols only data is transferred from the installed smart card to the printer s image processor board The PCL printer language is also supported The printer is marketed in three versions The Phaser 780 N Standard comes standard with 64 Mbytes of RAM The printer contains 136 standard built in fonts The standard Phaser 780 prints at a resolution of 600 x 600 dots per inch on and B size media The base printer does not support grayscale printing The Phaser 780 GN Graphics features 96 Mbytes of RAM and can print at 600 x 1200 dpi It also contains 136 fonts The graphics printers supports 16 level grayscale printing as well as printing oversize B images The Phaser 780 P Plus features 192 Mbytes of RAM and supports the same features as the GN printer In addition the
86. lean the laser window with puffs of air from the suction bulb Alternately you can vacuum the window clean Wipe off the pre exposure erase lamp with a lint free wipe Vacuum out the interior of the printer Vacuum loose toner out of the carousel assembly Remove and clean the accumulator belt cleaner assembly Removing the accumulator belt cleaner assembly is explained on the Phaser 780 Service CD ROM Once removed gently vacuum the cleaner assembly using a vacuum with a brush attachment Do not touch the cleaner blade with your hands nor bend or crease the film seal If you must clean the fuser rollers never clean them with alcohol First clean the fuser rollers by processing 10 sheets of paper through the printer If more cleaning is needed clean the rollers with a soft lint free cloth with either fuser oil or water Phaser 780 Color Printer Resetting NVRAM Resetting returns all the image processor s NVRAM stored parameters to their factory defaults except the print counts and the Adobe firmware serial number Caution Resetting will also reset the network card s If possible copy down all network parameters or print the Configuration Page To reset the image processor to its factory default values follow this procedure 1 Turnon the printer 2 When the row of X begins to be displayed on the front panel press and release button 1 and then press and release button 4 3 When the
87. led 97 1 kg 213 Ibs with lower tray feeder and consumables Table 2 Physical dimensions of lower tray feeder Dimension Value Height 41 4 cm 16 3 in Width 56 cm 22 in Depth 56 cm 22 in Weight 23 5 kg 52 Ibs Table 3 Printer clearances Dimension Value Top 40 0 cm 15 7 in Left 50 3 cm 20 in Right 55 1 cm 21 5 in Front 83 5 cm 33 in Rear 15 0 cm 6 in Bottom No obstructions underneath that could block cooling vents Mounting surface flatness Front feet less than 5 mm above or below rear feet Left feet less than 10 mm above or below right feet Mounting surface dimensions Level surface with dimensions of at least 79 cm 31 in by 152 cm 60 in 14 Phaser 780 Color Printer Table 4 Functional specifications Characteristic Specification Printing process Electro photographic four color CMYK two transfer printing using modulated on off laser beam scanning Imaged is fused to paper using heat and pressure with silicone oil lubricant Color medium Four toner cartridges each containing one of four colors cyan magenta yellow or black The toner is a nonmagnetic dual component contact medium Addressability 600 x 600 dpi and 600 x 1200 dpi Print speed Time from paper load to paper eject A size Four color 4 pages per minute Monochrome 16 pages per minute Transparency 2 pages per minute B size Four color 2
88. ll the carousel motor Wiring harness e A o FN Carousel motor 780 5 78 Removing the carousel motor Service Guide 107 Carousel motor board 1 Remove the rear cover 2 Remove the wiring harnesses from the carousel motor board 3 Remove the screw securing the carousel motor board to the printer frame Remove the board Reverse these steps to install the carousel motor board m harness 780 5 79 Removing the carousel motor board 108 Phaser 780 Color Printer Carousel sensor 1 Remove the developer fan duct 2 Remove the screw securing the carousel sensor plate to the printer frame Remove the plate along with the attached carousel sensor from the frame 3 Disconnect the wiring harness from the carousel sensor 4 Squeeze the three latches securing the sensor to the plate and remove the sensor Reverse these steps to install the carousel sensor Carousel sensor Wiring harness Carousel sensor plate 780 5 56 Removing the carousel sensor Service Guide 109 Laser unit o gr d f Remove the top cover Remove the eight screws securing the laser unit cover to the printer frame and remove the cover Disconnect the wiring harnesses from the laser diode board Disconnect the wiring harness from the start of scan sensor board Remove the four screws securing the laser unit to the printer fra
89. lti purpose tray roller assembly 1 Remove the multi purpose tray top front and rear covers 2 Unhook the pick up spring from the pick up gear 3 Release the latches holding the pick up gear to the pick up shaft Slide the pick up gear pick up cam gear and lever stopper off the shaft 4 Remove the E ring securing the rear shaft bearing to the rear of the multi purpose tray 5 Remove the E ring securing the front shaft bearing to the front of the multi purpose tray 6 Slide the multi purpose tray roller assembly out of the multi purpose tray assembly Lever stopper Pick up cam gear Rear bearing Pick up 27 Front bearing 780 5 27 Removing the multi purpose tray roller assembly 94 Phaser 780 Color Printer Multi purpose tray pick rollers Note Replace the pick rollers as a set 1 Remove the multi purpose tray top cover 2 Release the latch holding the front pick roller core to the pick up shaft and slide the core away from the front pick roller 3 Slide the front pick roller toward the front roller core so the pick up roll clears the locking pin Remove the front pick roller 4 Release the latch holding the rear roller core to the pick roller shaft and slide the roller away from the rear pick roller 5 Slide the rear pick up roller toward the rear roller core so the pick roller clears the locking pin Remove the rear pick roller Service Guide 95 Reverse these steps to instal
90. ly cavity and remove the E ring securing the fuser drive gear shaft to the auger drive assembly 7 Remove the five screws securing the fuser drive gear train to the printer frame Remove the gear train Reverse these steps to install the fuser drive gear train 126 Phaser 780 Color Printer Fuser drive gear train Paper feed motor bracket Auger assembly 750 5 74 Removing the fuser drive gear train Service Guide 127 Lower exit assembly 1 Remove the left door by pushing in on its front hinge to free it from the printer Disconnect the wiring harnesses near the top rear of the lower exit assembly Remove the five screws securing the lower exit assembly to the printer frame Lift the lower exit assembly to unhook the top of the assembly from the printer frame Remove the assembly Disconnect the wiring harness from the top exit sensor and the wiring harness from the exit chute switch both located on the back of the lower exit assembly Remove the wires from the wire clips that are molded into the side of the lower exit assembly Reverse these steps to install the lower exit assembly 128 Phaser 780 Color Printer Lower exit assembly mo o Wiring harness 780 5 68 Removing the lower exit assembly Service Guide 129 Full stack sensor 1 Open the left door 2 Remove the screw securing the full stack sensor and its bracket Squeeze the four lat
91. mage processor chassis assembly up and off the four loosened screws located at the bottom of the chassis Remove the chassis from the printer frame Reverse these steps to install the image processor chassis Image processor chassis Loosen these screws 780 5 91 Removing the image processor chassis 134 Phaser 780 Color Printer Print engine control board 1 Perform the Life Date Save Life Count described in Running built in diagnostics on page 69 to save the information stored in the print engine control board NVRAM in the image processor board Remove the image processor chassis Disconnect the nine wiring harnesses connected to the print engine control board Remove the screw securing the ground wire to the print engine control board Remove the wire Remove the three other screws securing the print engine control board to the printer frame Remove the board Reverse these steps to install the engine control board Perform the Life Date Restore Life Count to restore the counts to the engine control board NVRAM Wiring harness Ground wire D Z di 2 COE ets lt Print engine control board 780 5 87 Removing the print engine control board Service Guide 135 136 Phaser 780 Color Printer FRU List This topic provides a list of field replaceable units for the Phaser 780 Color Printer Changes to Tektronix products are made to accommodate improve
92. me Carefully lift the laser unit off the printer frame Reach under the unit and disconnect the wiring harness from the laser unit motor board Remove the laser unit Reverse these steps to install the laser unit 110 Phaser 780 Color Printer Removing the laser unit Erase lamp rail assembly Remove the imaging unit Remove the laser unit as described in Laser unit on page 110 Disconnect the wiring harness from the waste cartridge full sensor 1 2 3 4 Disconnect the wiring harness from the waste cartridge sensor 5 Freethe wiring harnesses from the wire clamps 6 Disconnect the wiring harness from the erase lamp 7 Remove the two screws securing the erase lamp rail assembly to the front of the printer frame Caution Be careful not to damage the accumulator belt underneath the erase lamp rail assembly 8 Liftthe erase lamp rail assembly up through the top of the printer frame Reverse these steps to install the erase lamp rail assembly 112 Phaser 780 Color Printer Erase lamp m 2 E T 780 5 50 Removing the erase lamp rail assembly 113 Service Guide Erase lamp 1 Remove the erase lamp rail assembly as described in Erase lamp rail assembly on page 112 2 Release the three latches holding the erase lamp assembly to the erase lamp rail assembly Remove the lamp Reverse these steps to install the erase lamp Erase lamp AX
93. mulator belt assembly shaft Note for reassembly the orientation of the spring collar and K clip Push in on the spring loaded collar to release the front of the accumulator belt assembly drive shaft from the front of the printer frame Lift up the accumulator belt assembly free the two high voltage wires from the grommet hole at the rear of the frame and remove the accumulator belt assembly out of the printer frame Place the accumulator belt assembly on a clean flat and stable work surface Do not allow the belt itself to touch any foreign surfaces On reassembly remove the shipping restraints from the front and rear of the new accumulator belt assembly Ensure that the front bearing of the accumulator belt assembly squarely fits into its receiver hole in the frame Service Guide 119 Spring loaded collar 4 Bearing fits in hole Accumulator belt assembly 780 5 59 Removing the accumulator belt assembly 120 Phaser 780 Color Printer Accumulator belt cleaner assembly 1 Remove the fuser assembly as described in Fuser assembly on page 125 Open the front cover Reach through the empty fuser cavity and hold the bottom of the belt cleaner assembly Loosen the two screws securing the cleaner support to the printer frame Remove the cleaner support while retaining the spring on the cleaner support Slide the belt cleaner assembly to the front of the printer and remove the assembly through the f
94. n internal front panel test print Enable the Error Handler through the front panel and try printing the job again If an error page is printed after printing the job again call the Customer Support Hotline for further assistance Please have the error page in hand If available try printing to a black and white PostScript printer such as an Apple LaserWriter If the file does not print on the black and white PostScript printer this may mean that the problem may be application or network related Windows printing problems Image never prints Printer acts as if it is receiving data but nothing comes out of printer or the printer goes back to Ready mode with out printing image gv mo moo Under the printer s setup options set RETRY 850 Try printing from the printer driver Try printing from another application Try printing to another printer Try printing from another computer Try printing an internal front panel test print Blue color on the screen is printing too purple Many applications describe color as percentages of a video display screen s primary colors red green and blue RGB When a printer translates these RGB colors into its own primaries of cyan magenta and yellow CMY blue is often printed as purple 1 To adjust blue from within Microsoft Windows Within the Tektronix PostScript Windows driver you have an option Vivid Color that alters to blue colors that are appearing purple T
95. ne control board Install Tray 1 The engine control board did not detect a paper tray installed in Tray 1 slot the tray into the main feeder slot Inspect the tray s switch actuators for damage Replace the paper size sensor assembly Replace the engine control board Install Tray 2 The engine control board did not detect a Paper Tray installed in Tray 2 slot Reseatthe tray into the second feeder slot Inspect the tray s switch actuators for damage Replace the paper size sensor assembly Inspect the lower feeder to printer connections atthe back of the printer Replace the engine control board Service Guide 33 Error code and message Description Corrective action Install Tray 3 The engine control board did not detect a Paper Tray installed in Tray 3 slot 1 Reseat the tray into the third feeder slot 2 Inspect the tray s switch actuators for damage 3 Inspectthe lower feeder to printer connections Replace the paper size Sensor assembly 4 Replace the engine control board Install Tray 4 The engine control board did not detect a Paper Tray installed in Tray 4 slot 1 Reseatthe tray into the fourth feeder slot 2 Inspectthe tray s switch actuators for damage 3 Inspectthe lower feeder to printer connections Replace the paper size sensor assembly 4 Replace the engine control board Install Imaging U
96. ne control board Printer Maintenance Required Replace the Accumulator Belt Cleaner The accumulator belt cleaner is nearing end of life The engine control board detected that the accumulator belt Cleaner processed 100 000 sheets of paper Use diagnostics to verify the print count Replace the accumulator belt cleaner Replace the engine control board Printer Maintenance Required The accumulator cleaner belt has reached end of life The engine control board detected that the accumulator belt Cleaner has processed over 102 000 belt clean cycles Use diagnostics to verify the print count Replace the accumulator belt cleaner 3 Replace the engine control board Printer Maintenance Required Replace the Second Bias Transfer Roller The second bias transfer roller is nearing the end of its life The engine control board detected that the second bias transfer roller has processed 100 000 sheets of paper 2 Use diagnostics to verify the print count Replace the second bias transfer roller Replace the engine control board Service Guide 35 Error code Description Corrective action and message Printer The second bias transfer roller has 1 Use diagnostics to verify the Maintenance reached end of life The engine control print count Required board detected that second bias transfer 2 Replace the second bias roller has completed over 1
97. ng unit ID Error used CRUM 2 Power cycle the printer Error 69 3 Replace the imaging unit 4 Replace the engine control board Imaging Unit There is CRU Memory problem The 1 Reseatthe imaging unit ID Error engine control board detected that the 2 Power cycle the printer Error 70 memory initial value of the installed 3 Replace the imaging unit imaging unitis wrong 4 Replace the engine control board Imaging Unit An incompatible imaging unitis installed 1 Power cycle the printer ID Error in the printer The engine control board 2 Reseat the imaging uni Error 71 detected that the memory device inthe 3 Switch the printer power off installed imaging unit is incompatible then on with the printer 4 Replace the engine control board Imaging Unit There is CRU memory problem The 1 Power cycle the printer Count Error engine control board could notreadthe 2 Replace the imaging unit with Error 72 CRUM counter value a new cartridge 3 Replace the engine control board 24 Phaser 780 Color Printer Error code and message Description Corrective action Imaging Unit ID Error Error 73 The wrong imaging unit is installed in the printer The engine control board detected that the installed imaging unit is incompatible with the printer Power cycle the printer Replace the imaging unit with a new cartridge Replace the engine control board Imaging Unit Comm Error Error 74 There i
98. nit The imaging unitis either not installed or not installed correctly The engine control board did receive a signal from the customer replaceable unit memory 1 Reseatthe imaging unit 2 Inspectthe CRUM connector fordamage orcontamination Clean or replace if necessary 3 Replace the imaging unit 4 Replace the engine control board Install Fuser Roll Cartridge The engine control board detected that the fuser oil roll assembly circuitis open 1 Reseatthe fuser oil roll 2 Inspectthe fuser roll contacts and connectors Ensure they are clean and seated correctly 3 Replace the fuser roll 4 Replace the engine control board 34 Phaser 780 Color Printer Error code and message Description Corrective action Second Bias Transfer Roller Error The engine control board detected that the measured current value across second bias transfer roller was not within specifications 1 2 Power cycle the printer Replace the high voltage power supply Replace the engine control board Replace the second bias transfer roller Replace the accumulator belt assembly Replace Fuser The fuser has reached end of life The engine control board detected thatthe fuser has processed 250 000 images or the toner dispense motor has accumulated more than 70 564 x 100ms of running time Use diagnostics to verify the print count Replace the fuser Replace the engi
99. not rotate the carousel motor does not cycle and the printer does not go into warm up 1 110VACIN Check a Inspect the AC Power Cord Is the AC Power Cord plugged into the printer and is the other end plugged into an AC wall outlet b Check the voltage at the AC wall outlet Is there approximately 110 VAC or 220 VAC if the printer is the 220 VAC model at the AC wall outlet c Remove the rear cover Measure the voltage between the two low voltage power re solder points located next to the AC power jack Is there 110 VAC between the two points 2 Low voltage power supply check Measure the voltage between P33 3 on the low voltage power supply and frame ground Is there 5 VDC between P33 3 and frame ground If not replace the low voltage power supply Check for 24VDC between P32 3 on the low voltage power supply and frame ground Replace the low voltage power supply Check for 24VDC between P32 8 and frame ground If voltage is at pin 3 but not at pin 8 check the front cover fuser and paper feeder interlock switches Is there 24VDC between P32 11 and frame ground If not replace the power supply Check for a short in the 24 volt components particularly on the paper feed motor circuit board 3 Low voltage power supply loading check Disconnect P32 and P33 from the low voltage power supply b Measure the voltage between P33 3 on the low voltage power supply and frame ground and between P32 11 on the l
100. nt 61 Randomspotting 62 Media jams and the paper path 63 Skewed image 63 Damaged prints 64 Inoperative lower tray feeder 65 Power problems 65 All front panel indicators remain off The printer does not initialize uponpower up 65 Front panelindications 66 Media tray indicates missing or empty when itisnot 66 Macintosh printing problems 66 Image never prints 66 Image prints in black and white 66 Image is rotated 90 degrees 67 Windows printing problems 67 Image never prints 67 Blue color on the screen is printing too purple 67 Printing from Windows 3 1 produces the message Problem writing device LPT1 Cancel or Retry 68 Workstation printing problems 68 Image never prints 68 Running built in diagnostics 69 Adjustments 73 Printing test prints 73 Print service test prints 73 Printing the configuration page 73 Printing the demonstration pages 73 Print engine calibration 74 Adjusting for impulse banding 74 Cleaning and Maintenance 77 Service preventive maintenance procedure 77 Recommended tools 77 Cleaning 78 Resetting NVRAM 79 viii Phaser 780 Color Printer Key FRU Disassembly 81 Paper feeder 82 Feeder registration chute 83 Feeder registration clutch 84 Registration brake clutch 85 Feeder metal registration roller 86 Feeder rubber registration roller 87 Feeder pre registration clutch 88 Feeder pre registration rollers 89 Paper pick turn roller 91 Paper feed drive gear train 92 Paper feed motor 93 Multi purpose
101. ny band deletions visible on the surface of the accumulator belt If no replace the accumulator belt 10 Generate a test print and open the front cover just before the sheet of paper enters the fuser 48 Phaser 780 Color Printer Inspect the image on the paper just before the paper enter the fuser Is there a normal test print image without any band deletions visible on the sheet of paper If not replace the second bias transfer roller Generate a test print and slide the fuser assembly out of the printer just as the sheet of paper exits the fuser Inspect the image on the sheet of paper just after the paper exits the fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has visible band deletions after it exits the fuser If yes replace the oil roll cartridge Generate a test print Inspect the image on the sheet Is the image now normal without band deletions as it exits the fuser If no replace the fuser Missing bands in parallel to the leading edge Leading Edge There are areas of the image that are extremely light or are missing entirely These missing areas form wide bands that run across the page parallel with the leading edge of the a gt print perpendicular with the direction of paper travel B size print k Ae shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print
102. o Access this option select Printer Control Panel Right click Printer Driver Choose Properties Choose Color Corrections Select Vivid Color Service Guide 67 Printing from Windows 3 1 produces the message Problem writing device LPT1 Cancel or Retry Option 1 1 Select Printers and click Configure Change the port selection from LPT1 to LPT1 OS2 3 The MODE command disables DOS timeouts The LPT1 OS2 selection forces Windows to print through DOS instead of directly to the printer Option 2 The solution above does not allow users to spool documents using the PrintManager To use the PrintManager as well as correcting time out problems edit the following line in the win ini file TransmissionRetryTimeout 45 to TransmissionRetryTimeout 850 In Windows 3 1 Follow the above instructions for issuing the MODE command in DOS Start Windows Select the Control Panel from the Main menu Select Printers Select the appropriate printer and click on Connect Ov A X NM Uncheck the Fast Printing Direct to Port box Workstation printing problems Image never prints Printer acts as if itis receiving data but nothing comes out of the printer or the printer goes back to Ready mode without printing an image For serial or parallel printing Ensure that the print file ends with a CTRL D character CTRL D indicates the end of file which the printer responds to by closing host to printer communications
103. o increase Se ed oard density Replace The imaging unit has reached end of life 1 Replace the imaging unit Imaging Unit The engine control board detected that 2 Switch the printer power off the installed imaging unit has reached then on end of life 3 Inspectthe CRUM for damage or contamination Clean or replace if necessary 4 Replace the engine control board Fuser Roll The fuser oil roll is nearing end of life 1 Replace the fuser oil roll Cartridge The engine control board detected that 2 Replace the engine control Low the fuser oil roll is nearing the 20 000 board mark Service Guide 27 Error code Description Corrective action and message Waste The waste toner box is almost full The 1 Replace the waste toner box Cartridge engine control board detected that the 2 Replace the engine control Almost F ull waste toner box is almost full and will board Soon need to be replaced BlackToner The black toner cartridge is low on toner 1 Replace the black toner Low The engine control board switched on cartridge the dispense motor for more than980 2 Test the dispense motor seconds in order to raise the image Testthe auto density _ density to normal calibration Replace it if necessary 4 Replace the engine control board Cyan Toner The cyan toner cartridge is low on toner 1 Replace the cyan toner Low The engine control board switched on cartridge the Dispense Motor for more than 800 2 Test
104. ol board detected an open environment sensor circuit Power cycle the printer Inspect the process drive Ensure the drum rotates Replace the engine control board Replace the image processor board Power cycle the printer Replace the environment Sensor Replace the engine control board Service Guide 21 Error code Description Corrective action and message Second Bias engine control board detected that 1 Check the wiring from the Transfer the measured current value thru the high voltage power supply to Roller Error second bias transfer roller was not within the second bias transfer roller Error 24 specification 2 Replace the second bias transfer roller 3 Replace the high voltage power supply 4 Replace the accumulator belt assembly 5 Replace the engine control board Fuser There is a problem with the temperature 1 Open the fuser door and Temperature of the fuser The engine control board ensure the fuser connectors Error detected that the fuser temperature did are properly seated Error 40 not reach 110 C within six minutes after 2 Close the fuser and power the printer was turned on Cycle the printer Check that the fuser heats up 3 Check for line voltage at P J 71 pins 1 and 2 If no voltage is present replace the power supply 4 Replace the fuser 5 Replace the engine control board Fuser There is a problem with the fuser heat 1 Open the fuser door and
105. or 6 Check the operation of the paper pick solenoid 7 Inspect the paper path 8 Clean the feed rollers 9 Test the registration sensor 10 Run the paper path test 11 Replace the engine control board ClearJam At There is problem at the fuser exit 1 Clearjammed paper from the C D sensor The engine control board printer detected that the fuser exit sensorwas 2 Test fuser exit sensor actuated while the printer was in 3 Replace the engine control standby board ClearJam At There is problem near the fuser exit 1 Clearjammed paper from the C D sensor The engine control board printer detected that the fuser exit sensor did 2 Test the fuser exit sensor not actuate within the specified time 3 Inspect the paper path after the fuser entrance sensor was 4 Inspect the fuser chute fan actuated 5 Replace the fuser _ 6 Inspect the fuser drive gear train Replace if necessary 7 Replace the paper feed motor 8 Replace the engine control board ClearJamat There is problem at the media exit 1 Clearjammed paper from the E sensor The engine control board printer detected thatthe top exit sensor was 2 Testthe feeder media exit actuated while the printer was in sensor standby 3 Inspectthe paper exit path 4 Replace the engine control board Service Guide 31 Error code and Description Corrective action message ClearJam At The engine control board detected that 1 Clearjammed paper from the E the media exit
106. or board Engine control board P J16 246 Map 6 F607 Carousel motor board Low voltage power supply P J32 247 Map 6 E607 Carousel motor board Carousel Motor F421 Map 5 D508 Bias charge roller connector High voltage power supply P J A F422 Map 1 B108 Developer contact assembly High voltage power supply P J C F423 Map 5 D511 DTS Plate High voltage power supply P J G F791 Map 8 F807 Pressure roller heat rod Heat roller heat rod A Map 6 B606 High voltage power supply P J F421 C Map 6 C607 High voltage power supply P J F422 D Map 6 B609 High voltage power supply First bias transfer roller bias plate F Map 6 B608 High voltage power supply Second bias transfer roller contact plate G Map 6 B608 High voltage power supply P J F423 T1 Map 8 G811 Heat roller heat rod T2 Map 8 1806 Pressure roller heat rod T3 Map 5 D510 First bias transfer roller bias plate T4 Map 5 E510 Second bias transfer roller contact plate T5 Map 8 1806 Not on schematic 310 Map 3 F306 Image processor board Front panel P J317 314 Map 3 G306 Image processor board Image processor fan 317 Map 3 C306 Front panel Image processor board P J314 192 Phaser 780 Color Printer The following illustrations detail the proper means of routing and dressing printer wiring Incorrect wiring dressing can result in wires pinched by cabinet panels or damagec by moving parts of the printer 3041 10 Map 1 Wiring routing at the top and front of the printer Service Guide 1 105 105A
107. ots appear in a single color run 20 prints to consume the clumped toner If necessary replace the toner cartridge Remove and inspect the imaging unit Is the exterior of the imaging unit clean and with no obvious toner leakage If not remove and inspect the waste toner cartridge Make sure the cartridge is not damaged or leaking Remove the top cover Turn the carousel frame and inspect the four developer assemblies Does each developer assembly appear clean without any obvious toner on the exterior of the assembly or falling from the magnetic brush Clean the dirty developer assembly If the problem reoccurs replace the faulty developer assembly Inspect the fuser Is the fuser free of toner Clean the fuser if necessary by processing 10 sheets of B size paper though it Remove and inspect the accumulator belt cleaner assembly Is the accumulator belt cleaner assembly clean and with no obvious toner leakage If not clean or replace the accumulator belt cleaner assembly if necessary With the accumulator belt cleaner assembly removed inspect the accumulator belt cleaner end of the auger Is the auger clogged Clean the printer interior Remove the rear cover With the accumulator belt cleaner assembly removed watch the auger drive gear as you manually rotate the paper feed motor Does the fuser drive assembly rotate the auger drive gear If not replace the fuser drive assembly As you manually rotate the paper feed motor p
108. ow voltage power supply and frame ground Is there 5 VDC between P33 3 and frame ground and is there 24 VDC between P32 11 and frame ground If not replace the low voltage power supply 4 Engine control board loading check Reconnect P32 and P33 to the low voltage power supply b Referto Wiring Diagrams on page 185 and one by one disconnect components that are connected to the engine control board 40 Phaser 780 Color Printer C Measure the voltage between P33 3 on the low voltage power supply and frame ground and between P32 11 on the low voltage power supply and frame ground Do you eventually measure 5 VDC between P33 3 and frame ground and 24 VDC between P32 11 and frame ground If yes replace the component that is down the power supply If replace the engine control oard 5 Image processor check a Turn off the printer b Remove the image processor board Turn on the printer Does the printer go into warm up If yes replace the image processor board If not replace the engine control board Erratic printer operation The printer has a variety of intermittent problems but generally does not complete a print cycle The problems are generally not identified by displayed error codes 1 Does the printer frequently fail to enter printer warm up or is the front panel frequently inoperative If yes follow the earlier procedure Printer will not power up on page 40 2 Run print engine test
109. ower supply P J33 13 Map 2 D205 Engine control board Laser Diode board P J122 14 Map 2 D204 Engine control board Laser Unit P J121 P J123 P J124 16 Map 2 D204 Engine control board CRUM 17 Map 2 E204 Engine control board Auto density calibration Sensor P J81 Erase Lamp P J86 18 Map 2 E203 Engine control board Waste Toner Sensor P J88 Toner Box Sensor P J83 19 Map 2 F203 Engine control board Fuser Assembly P J71 20 Map 2 F204 Engine control board Paper feeder P J91 21 Map 2 F204 Engine control board Low voltage power supply P J32 22 Map 2 C204 Communications Assembly Engine control board P J18 22A Map 2 C204 P J22 Engine control board P J16 32 Map 6 D609 Low voltage power supply Engine control board P J21 33 Map 6 D610 Low voltage power supply Engine control board P J12 35 Map 6 G609 Low voltage power supply Fuser Assembly P J71 41 Map 6 C609 High voltage power supply Low voltage power supply P J32 42 Map 6 C609 High voltage power supply Engine control board P J16 49 Map 6 E609 Paper feed Motor Low voltage power supply P J32 50 CN2 Map 6 608 Paper feed Motor Engine control board P J17 186 Phaser 780 Color Printer Plug Jack Locations 2 P J Map amp Coordinates Connected to Other end connected to CN3 Map 6 E609 Mounted on Paper feed motor board CN4 Map 6 E608 Mounted on Paper feed motor board 51 6 D608 Process Motor Low
110. ower up Turn on the printer The printer generates process black all four colors layered grid patterns The printer feeds from the first tray that has paper in this order Tray 1 Tray 2 Tray 3 Tray 4 and multi purpose feeder The printer sends the test prints to the face down output tray The printer generates test prints until you stop the test Switch off printer main power to stop generating test prints Move the 930 switch 4 to the off open position Using the print engine board To generate a test print without the image processor installed 42 ON Turn off the printer Remove the image processor so you can access the engine control board Locate JP3 just below the ROM chip on the engine control board Move the switch to the ON position Turn on the printer The printer generates test prints just as it does in the previous procedure Switch off printer main power to stop generating test prints Move the switch to the 1 position Phaser 780 Color Printer Printing and print quality problems Initial checks and actions 1 Does the printer display an error code If so go to Error Codes and Messages on page 19 Is the AC power provided at the wall outlet within recommended specifications Is the printer properly gounded through the AC wall outlet Is the printer located in an area where the temperature and humidity are stable and within specifications Is the printe
111. parallel to the direction of the paper path making print artifacts parallel to the long edge of the print In B size prints are processed through the printer with the long edge of the print parallel to the 3041 41 paper path making artifacts parallel to the short axis of the print Inspect the paper that is loaded in the paper tray Is the paper wrinkled dimpled or show any signs of having a high moisture content Print Service Print 1 Do the bands appear in all four colors If yes go to Step 3 If not go to Step 11 Generate a test print and open the front cover just before the sheet of paper enters the fuser Remove the imaging unit Service Guide 49 10 11 12 13 14 50 Inspect the image on the drum Is there a normal test print image without any band deletions visible on the drum If yes go to Step 6 If not replace the imaging unit Inspect the image on the surface of the accumulator belt Is there a normal test print image without any horizontal band deletions visible on the surface of the accumulator belt If no replace the accumulator belt Inspect the image on the sheet of paper just before the paper enter the fuser Is there a normal test print image without any band deletions visible on the sheet of paper If not replace the second bias transfer roller Generate a test print and open the front cover just as the sheet of paper exits the fuser Inspect the image on the sheet
112. per assembly appear smooth evenly formed without any low spots and without obvious contamination If not replace the defective developer assembly Replace the high voltage power supply Streaks parallel with the leading edge Leading Edge There are dark lines running parallel 52 with the leading edge of the print perpendicular to direction of paper travel B size print shown The printer displays no error code Note A size prints are processed through the printer with the short edge of the print parallel to the direction of the paper path making print artifacts parallel to the long edge of the print In B size prints are processed through the printer with the long edge of the print parallel to the paper path making artifacts parallel to the short axis of the print 3041 43 1 Print Service Print 1 Do the streaks appear in all colors If not go to Step 8 PrintService Print 4 and open the front cover just before the sheet of paper enters the fuser Remove the imaging unit Inspect the image on the drum Is there a normal test print image without any horizontal streaks visible on the drum If yes go to Step 4 If not replace the imaging unit Inspect the image on the surface of the accumulator belt Is there a normal test print image without any streaks visible on the surface of the accumulator belt If no replace the accumulator belt If yes inspect the accumulato
113. printer frame Remove the clutch Reverse these steps to install the developer clutch Wiring harness Developer clutch 780 5 81 Removing the developer clutch Service Guide 101 Developer tie plate 1 Remove the lower exit assembly as described in Lower exit assembly on page 128 Remove the rear cover Remove the inner cover Remove the wire and wire clamp from the developer tie plate az SND Remove the two screws securing the developer tie plate to the rear of the printer frame 6 Remove the two screws securing the developer tie plate to the front of the printer frame 7 Slide the tie plate up and out of the printer frame Reverse these steps to install the developer tie plate 102 Phaser 780 Color Printer Developer tie Wire clamp Removing the developer tie plate 103 Service Guide Toner developer dispense motor 1 Remove the carousel motor board as described in Carousel motor board on page 108 2 Remove the two screws securing the toner developer dispense motor to the printer frame 3 Slide the toner developer dispense motor up and slightly to the left to free the motor shaft gear from the frame Remove the motor 4 Disconnect the wiring harness from the toner developer dispense motor Note Install the motor using the two left side mounting screw holes Reverse these steps to install the toner developer dispense motor Wiring harness
114. prints which print independently of the image processor to determine if the image processor is the problem Refer to Making a print engine only test print on page 42 3 Low voltage power supply loading check a Run 50 test prints from the image processor s built in test prints b Measure the voltage between P33 3 on the low voltage power supply and frame ground and between P32 11 on the low voltage ponet D and frame ground Is there a steady 5 VDC etween P33 3 and frame ground and is there at steady 24V DC between P32 11 and frame ground If no Replace the low voltage power supply 4 Iftest prints from the image processor print reliably reload the host s printer driver software or the host application software Does the printer still exhibit erratic operation 5 Try printer from another application Ensure that the host computer prints reliable to a different printer Also try printing from another computer to the Phaser 780 6 Replace the interface cable connecting the host to the printer 7 Replace the engine control board 8 Replace the image processor board Service Guide 41 Making a print engine only test print Using the image processor 1 2 6 7 Turn off the printer Remove the right side panel to access the image processor board Locate switch 4 of 930 on the image processor board Closing switch 4 bypasses the image processor board and places the engine control board into test mode upon p
115. r Service Guide 163 780 5 132 Drive FRUs Phaser 780 Color Printer 164 Table 14 Drive FRUs Parts Partnumber Serial number Qty Name and description Effective Discont d 1 118 9804 00 1 Paper feed drive assembly 2 118 9806 00 1 Process drive assembly 3 Process motor part of process drive assembly 4 118 9809 00 1 Carousel motor board 5 118 9810 00 1 Toner developer dispense motor 6 118 9811 00 1 Developer clutch 7 118 9730 00 Paper feed motor assembly kit 7a Paper feed motor support 7b Paper feed motor 7C Harness clamp 7d Paper feed bracket 8 118 9805 00 Fuser drive assembly 9 118 9808 00 Carousel motor Service Guide 165 Part of Carousel FRU Part SEM 780 5 133 Electronic rear FRUs Phaser 780 Color Printer 166 Table 15 Electronic rear FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9873 00 1 High voltage power supply board 2 118 9731 00 Developer fan kit 2a 1 Developer fan 2b 1 Developer fan duct 3 118 9816 00 1 Top cover switch 4 118 9817 00 1 Fuser connector Main 5 119 5871 00 1 Low voltage power supply 110 VAC 119 5872 00 1 Low voltage power supply 220 VAC 6 118 9819 00 Main harness DC Service Guide 167 780 5 134 Electronics front FRUs Phaser 780 Color Printer 168 Table 16 Electronic front FRUs Parts Part number Serial n
116. r circuit board Replace the lower feeder assembly Replace the engine control board Load Media in Tray 2 Tray 2 is out of paper The engine control board detected that the paper empty Sensor in tray 2 is actuated Load paper into Tray 2 Testthe tray s paper empty Sensor Replace the lower feeder circuit board Replace the lower feeder assembly Replace the engine control board Load Media in Tray 1 Tray 1 is out of paper The engine control board detected that the paper empty sensor in tray 1 is actuated Load paper into Tray 1 Testthe tray s paper empty Sensor Replace the lower feeder circuit board Replace the engine control board ClearJam At The engine control board detected that the registration sensor was actuated while the printer was in standby 2 Clearjammed paperfrom the printer Test the feeder registration exit sensor Replace the engine control board 30 Phaser 780 Color Printer Error code Description Corrective action and message ClearJamAt There is a problem near the registration 1 Clearjammed paper from the sensor The engine control board printer detected that the registration sensor did 2 Check that the media tray not actuate within the specified time Em it is correctly alter paper feed 3 Test the pre registration clutch 4 Test the registration clutch 5 Test the paper feed mot
117. r belt cleaner s plastic shield for damage replace the belt cleaner if necessary Replace the second bias transfer roller Print Service Print 4 and slide the fuser out of the printer just as the sheet of paper exits the fuser Inspect the image on the sheet of paper just after the paper exits the fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has visible streaks after it exits the fuser If yes replace the fuser roll cartridge If streaks continue to occur replace the fuser Phaser 780 Color Printer 8 Remove the top cover Turn the carousel frame and inspect the magnet roller of each of the four developer assemblies Do the magnet rollers of each developer assembly appear smooth evenly formed without any low spots and without obvious contamination If not replace the defective developer assembly 9 Replace the high voltage power supply Banding 3041 44 There are three kinds of banding 1 Ifa dark band appears every 364 mm from the leading edge of a B size print or occasionally on A size print reseat the imaging unit and print again If the problem persists perform the procedure Adjusting for impulse banding on page 74 2 Ifa dark band appears at a 1 3 to 1 7 mm pitch throughout solid fills replace the process drive assembly 3 Dark bands appearing randomly in solid fills at pitches such as 44 mm 88 mm or 104 mm Replace the process drive as
118. r located in an area free of dust Is the printer located away from water outlets steamers electric heaters volatile gases open flames and strong radio frequency sources Is the printer shielded from the direct rays of the sun Does the printer have adequate clearances on all sides for proper ventilations Is the printer installed on a level stable surface Is the correct paper stock being used in the printer Is the customer using the printer correctly as explained in the user documentation Have the consumables been replaced correctly at the required intervals Is the problem a failure or the result of improper use incorrect media type weight excessive use or a limitation of the duty cycle Service Guide 43 Light undertone prints The overall image density is too light The printer displays no error code 1 Inspect the paper that is loaded in the paper tray Check that the paper is not wrinkled or moist Also ensure it is the correct weight i Card stock must be feed from the multi purpose tray Recycled paper and paper less than 24 Ibs may produce less than optimum quality 2 Clean and inspect the auto density calibration sensor Test the sensor using the printer s built in diagnostics If an error 11 12 or 13 is detected replace the auto density calibration 3041 37 sensor 3 Print Service Test Print 1 on B size paper and open the front cover just as the sheet of paper sta
119. rents Power source This product is intended to operate from a power source that will not apply more than 250 volts rms between the supply conductors or between either supply conductor and ground A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation This product is certified under IEC 825 as a Class 1 Laser Product DANGER CAUTION VORSICHT ATTENTION Invisible laser radiation Invisible laser radiation Unsichtbare Laserstrahlung Rayonnement laser invisible when open and interlock when open and wenn Abdeckung ge ffnet dangereux en cas defeated interlocks defeated und Sicherheitsverriegelung d ouverture et lorsque AVOID DIRECT AVOID DIRECT berbr ckt la s curit est neutralis e EXPOSURE TO BEAM EXPOSURE TO BEAM NICH DEM STRAHL EXPOSITION DANGEREUSE AUSSETZEN AU FAISCEAU Class 3B PELIGRO VARNING VAROI VARNING ADVARSEL ADVARSEL Cuando se abre y se Osynlig laser N kym t n Osynlig laserstr lning Usynlig laserstr ling Usynlig laserstraling invalida el bloqueo se str lning n r denna avattaessa ja n r denna del r ved abning n r nar deksel pnes og producen radiaciones del r ppnad och suojalukitus ppnad och sp rrar r Sikkerhedsafbrydere sikkerhedslas brytes invisibles de l ser sp rrar r ohitettaessa olet urkopplade er ude af funktion UNNG EVITESE LA urkopplade alttiina lasers teilylle BETRAKTA EJ UNDG UD EKSPONERING EXPOSICI N STR LE
120. res sets 3 Physical dimensions of printer 14 Physical dimensions of lower tray feeder 14 Printer clearances 14 Functional specifications 15 Electrical specifications 16 Environmental specifications 16 Diagnostic tests 69 Printer cover FRUs 139 Paper feeder FRUs 141 Multi purpose tray cover FRUs 143 Multi purpose tray FRUs 145 Paper feeder cover FRUs 147 Paper feeder FRUs 149 Imaging FRUs 151 Developer FRUs 153 Carousel FRUs 155 Accumulator belt assembly FRUs 157 Fuser assembly FRUs 159 Paper exit FRUs 161 Paper exit FRUs 163 Drive FRUs 165 Electronic rear FRUs 167 Electronic front FRUs 169 Image processor FRUs 171 Optional lower feeder cabinet FRUs 173 Optional feeder FRUs 175 Supplies and accessories 176 Plug Jack Locations 1 186 Plug Jack Locations 2 187 Plug Jack Locations 3 188 Plug Jack Locations 4 189 Plug Jack Locations 5 190 Plug Jack Locations 6 191 Plug Jack Locations 7 192 xiv Phaser 780 Color Printer General Information This service guide contains information useful to verify operation troubleshoot repair adjust and maintain a Tektronix Phaser amp 780 Color Printer To ensure complete understanding of the product we recommend participation in Phaser 780 service training if available ix Tektro 3041 01 The Phaser 780 printer shown with optional Lower Tray Assembly Service Guide 1 Phaser 780 overview The Phaser 780 Color Printer combines a color
121. rts to exit the fuser Inspect the image on the sheet of paper before it reaches the fuser rollers Is the image density normal before it reached the fuser rollers If no go to Step 4 If yes go to Step 7 4 Remove the imaging unit 5 Inspect the test print image on the accumulator belt Does the image appear completely transferred to the accumulator belt If yes replace the second bias transfer roller If not replace the accumulator belt 6 Print Service Test Print 1 and inspect the image on the sheet of paper Is the image density now normal If not replace the high voltage power supply 7 PrintService Test Print 1 again and inspect the image on the sheet of paper after it exits the fuser rolls Is the image light when it exits the fuser If yes replace the oil roll cartridge 8 Generate a test print 9 Inspect the image on the sheet Is the image density now normal as it exits the fuser If not replace the fuser 44 Phaser 780 Color Printer Blank prints The entire image area is blank The printer displays no error code 1 5 6 Generate a test print Is the test print blank If no reload the printer driver software or replace the image processor board Remove the imaging unit Inspect the empty imaging unit cavity for a sheet of paper that could be blocking the laser window Generate a test print and open the front cover just before the sheet of paper enters the fuser Remove the imagin
122. rvice the printer in the future The frequency of use and the type of paper a customer prints on will in large part determine how critical cleaning the machine is Users of ordinary Bond paper copier paper should have very few problems since this paper is smooth and relatively dust free You should thoroughly inspect and clean these printers Ask each printer customer about the type of paper he or she uses so that you can be sure to clean the parts of the printer that particular paper may affect If a customer is printing on the more unusual or dustier papers then you should pay particular attention to these printer parts The standard pick roller The multi purpose pick roller The feed rollers The cabinet interior The exit rollers Recommended tools Toner vacuum cleaner Suction bulb air blower Cleaning water Lint free wipes Cotton swabs Imaging unit cover Isopropyl alcohol greater than 90 pure Service Guide 77 Cleaning Caution Never apply alcohol on the second bias transfer roller X Qv de des X 10 11 12 13 78 Never apply alcohol to the fuser rollers Turn off the printer Remove the imaging unit and cover it to protect it from the light Remove the toner cartridges Slide out the fuser Remove the paper tray Slide out the paper feeder Clean all printer rollers except the second bias transfer roller and the fuser rollers with alcohol dampened wipes only C
123. s a CRU memory problem The engine control board could not write to the CRUM Power cycle the printer Reseatthe imaging unitin the printer Replace the imaging unit with a new cartridge Replace the engine control board Imaging Unit Comm Error Error 75 There is a CRU Memory problem The engine control board could not communicate with the CRUM Power cycle the printer Replace the imaging unit with a new cartridge Replace the engine control board Engine Board Error Error 76 ROM RAM Error Error 77 The engine control board detected a corrupted NVRAM during power on self test There is a problem in reading information from ROM or RAM on the engine control board The engine control board could not read information on the ROM or RAM Power cycle the printer Replace the NVRAM chip Replace the engine control board Power cycle the printer Check if 5 VDC is supplied atP 33 3 and frame ground Ifnot replace the low voltage power supply Replace the engine control board Service Guide 25 Error code Description Corrective action and message Image Image density exceeded design 1 Power cycle the printer Contains Too specifications 2 Printa less complex color Much The engine control board detected that image to determine if it is Coverage the first 70mm of the lead edge of the overly dense four color image about to be print
124. se steps to install the high voltage power supply High voltage power supply Wiring harness 780 5 84 Removing the high voltage power supply 132 Phaser 780 Color Printer Image processor Disconnect all interface cables connecting to the image processor Remove the right cover Disconnect all wiring harnesses from the image processor m gt Remove the 10 screws securing the image processor to the image processor chassis Pull the image processor away from the chassis disconnecting the image processor from the engine control board Swap components If you are replacing the image processor board exchange m The Boot ROM PLCC m The NVRAM chip DIP m The Real Time Clock module The components contains important customer created parameters The printer may not operate correctly without the components being swapped Also transfer from the old board to the new board m The RAM DIMMs m The PhaserShare card The SCSI card Image processor Jae Removing the image processor Service Guide 133 Image processor chassis 1 2 Remove the image processor fan Remove the image processor as descried in Image processor on page 133 Loosen but do not remove the four screws securing the bottom of the image processor chassis assembly to the printer frame Remove the five screws securing the top of the image processor chassis assembly to the printer frame Lift the i
125. sembly Edge of print is wrinkled with an area of ragged discoloration s 3041 45 The fuser roll cartridge is out of position 1 Reseat the fuser roll cartridge Service Guide 53 Random missing spots There are small areas of the image that are extremely light or are missing entirely These missing areas form spots that are localized to small areas of the page The printer displays no error code small number of occasional missing spots is normal 1 Inspect the paper that is loaded in the paper tray Ensure the paper is not wrinkled nor moist 2 Random white spots with a small grit like center usually occurring in cyan and magenta can be caused by compacted toner Print Service Print 5 6 7 or 8 which ever color applies to purge out the toner of the 3041 46 10 11 12 54 affective color Replace the affected toner cartridge If problem continues replace that color s developer Generate a test print and open the front cover just before the sheet of paper enters the fuser Remove the imaging unit Inspect the image on the drum Is there a normal test print image without any spot deletions visible on the drum If yes go to Step 6 If not replace the imaging unit Inspect the image on the surface of the accumulator belt Is there a normal test print image without any spot deletions visible on the surface of the accumulator belt If no replace the accumulator
126. sensor Service Guide ENGINE CONTROL BOARD PAPER FEEDER REGI SENSOR FRONT TRANSPARENCY SENSOR 24 1 REAR P J99 TRANSPARENCY SENSOR P J20 P J91 AG A14 AD REGI PAPER SENSED L 5VDC 2 lt D A13 A2 3 5 0 A12 4 AG AM MY FRONT OHP WHITE SENSED L 5VDC 5 A10 5VDC 6 A9 7 AG A8 ATY REAR OHP WHITE SENSED L 5VDC 8 AT 5VDC 9 5 A6 24VDC 25 gt B14 B1 gt PRE REGI CLUTCH ON L 24VDC 26 gt B13 p REGI CLUTCH ON L 24VDC B12 3 P J 1104 1108 1 2 3 PRE REGI CLUTCH REGI CLUTCH REGI BRAKE CLUTCH Wiring 10 Engine control board paper feeder 210 Phaser 780 Color Printer 24VDC 28 gt B11 REGI BRAKE CLUTCH ON L 24VDC 29 B10 AG B9 MAIN P H ASSY SENSED L 5VDC 31 5 lt B8 3041 28 ENGINE CONTROL BOARD PAPER FEEDER MULTI PURPOSE TRAY 9 207 MU LTI PURPOSE TRAY EDGE SENSOR MULTI PURPOSE AY OHP SENSOR MULTI PURPOSE TRAY LONG N P SENSOR Wiring 11 Engine control board paper feeder multi purpose tray LP J20 MULTI PURPOSE T
127. ser drive gear train to access the screw securing the plastic bracket holding the water auger housing Remove the low voltage power supply Remove the two screws securing the accumulator belt rear bracket to the rear of the printer frame Remove the bracket Remove the screw securing the auger drive assembly to the printer frame Remove the screw securing the auger tube to the rear of the printer frame Remove the screw securing the auger assembly bracket to the rear of the printer frame Remove the auger assembly from the printer Reverse these steps to install the waste auger assembly Service Guide 117 Waste auger drive assembly Waste auger assembly 780 5 64 Removing the waste auger assembly 118 Phaser 780 Color Printer Accumulator belt assembly ux x Remove the high voltage power supply Remove the erase lamp rail assembly Remove the paper feeder Remove the process drive unit Remove the auto density calibration sensor Reach through the paper feeder cavity and disconnect the wiring harness from the accumulator belt sensor Move the waste auger assembly for clearance Refer to Waste auger assembly on page 117 Remove the two screws securing the accumulator belt assembly bracket to the rear of the printer frame Remove the bracket Caution The accumulator belt is easily scratched be careful when 11 removing it Hold on to the front and the rear of the accu
128. sity calibration sensor Replace the engine control board 26 Phaser 780 Color Printer Error code Description Corrective action and message Replace Cyan image density is too low The 1 Replace the cyan toner Cyan Toner engine control board detected thatthe cartridge Cartridge auto density calibration sensor reads 2 Test toner developer the cyan patch density as being below dispense motor specification and that the reading is 3 Testthe auto density either slow to raise or does not raise 4 sene after the printer attempts to increase i as 9 density Replace Magenta image density is too low The 1 Replace the magenta toner Magenta engine control board detected thatthe cartridge Toner auto density calibration sensor reads 2 Test the toner developer Cartridge the magenta patch density as being dispense motor below specification and that the reading 3 Testthe e auto density is either slow to raise or does notraise after the printer attempts to increase a oard density Replace Yellow image density is too low The 1 Replace the yellow toner Yellow Toner engine control board detected that cartridge Cartridge auto density calibration sensor reads 2 Test the toner developer the yellow patch density as being below dispense motor specification and that the reading is 3 Test the auto density either slow to raise or does not raise A after the printer attempts t
129. t replace the turn roller assembly Generate a test print and slide the fuser out of the printer just as the sheet of paper is moving through the registration rollers Carefully slide the paper feeder out of the printer and inspect the position of the sheet of paper Is the sheet of paper parallel to the edges of the paper feeder as it leaves the registration rollers If no clean or replace the feeder rubber registration roller Remove second bias transfer roller Manually raise and lower the cam levers at the ends of the second bias transfer roller Are the cam levers undamaged When you raise the levers does the second bias transfer roller lower and when you release the levers does the second bias transfer roller raise Do the cam levers have a strong spring action If not replace the second bias transfer roller Service Guide 63 Damaged prints The printed page exits the printer either wrinkled creased or torn The printer neither jams nor displays an error code The following components are associated with this specific problem One or more of these components may have failed partially or completely If you cannot isolate the problem replace each component listed below one at a time until the problem disappears Check the media settings at the printer driver 64 Paper feeder usually appears without toner in creases or wrinkles Fuser Accumulator belt usually appears with toner in creases or wrinkles Check that the p
130. t 1 Reseatthe fuser Fuser Unit the fuser interlock circuit is open 2 Inspectthe fuser mating connectors for proper fit 3 Replace the engine control board Close Exit The engine control board detected that 1 Close the exit cover Cover the exit door switch is deactuated 2 Replace the exit chute switch 3 Replace the upper exit assembly 4 Replace the engine control board Close Right The engine control board detected that 1 Close the paper feeder Feed Unit the paper feeder Interlock circuit is assembly open 2 Inspectthe mating connectors of the paper feeder 3 Replace the paper feed harness 4 Replace the paper feeder 5 Replace the engine control board Close Front engine control board detected that 1 Close the front cover Cover the front cover interlock switch is 2 Inspectthe cover s switch deactuated actuators Replace the cover if damaged Test 24 VDC at Pins P32 8 and 3 You should measure 24 VDC at pin 3 through the right and left Cover interlock switches back to pin 8 Testfor 5 VDC between P33 1 and frame ground It should switch between 5 and 0 VDC when the front cover is opened and closed If not replace the left front cover switch Replace the low voltage power supply Service Guide 37 Error code Description Corrective action and message Empty the The engine control board detected that 1 Remove the prints from Top Output the full stack sensor is actuated for more outp
131. tch 780 5 46 Service Guide 85 Feeder metal registration roller 1 Remove the feeder registration clutch as described in Feeder registration chute on page 83 2 Remove the registration brake clutch as described in Registration brake clutch on page 85 3 Remove the E ring securing the out gear at the front end of the metal registration roller Remove the gear 4 Remove the rear bearing from the metal registration roller 5 Slide the metal registration roller to the rear slide the front of the roller out of the front bearing and remove the roller from the main paper feeder Reverse these steps to install the feeder metal registration roller Metal registration roller 4 Rear bearing Front bearing Out gear 780 5 41 Removing the metal registration roller 96 Phaser 780 Color Printer Feeder rubber registration roller 1 Remove the feeder metal registration roller 2 Remove the E ring at the front of the rubber registration roller securing the gear to the roller Remove the gear 3 Remove the E ring securing the rear of the rubber registration roller to the paper feeder 4 Remove the rear bearing and black spring from the rear end of the rubber registration roller 5 Slide the rubber registration roller out of the paper feeder Note the silver spring and bearing on the front end of the roller Reverse these steps to install the feeder rubber registration roller The front portion of the shaft
132. that the correct Phaser 780 printer icon was selected in the Chooser Try printing the job again In the Chooser or the print dialog switch background printing to off Try printing the job again Ensure that the printer can print by printing an internal front panel test print Enable the Error Handler through the front panel and try printing the job again If an error page is printed after printing the job again call the Customer Support Hotline for further assistance Please have the error page in hand If available try printing to a black and white PostScript printer such as an Apple LaserWriter If the file does not print on the black and white PostScript printer this may mean that the problem may be application or network related Image prints in black and white 1 In the print driver dialog box make sure the Color Grayscale option has been selected Check the version of your LaserWriter driver to ensure that it is version 6 0 7 or higher Earlier versions of the driver do not support color PostScript The application may require special instructions to print Ensure the driver setting TekColor is not set to Monochrome mode Phaser 780 Color Printer Image is rotated 90 degrees 1 In the application s Page Setup make sure that the image is selected to print in portrait or landscape orientation to match the document Also ensure the selected paper size is correct Ensure that the printer can print by printing a
133. the dispense motor seconds in order to raise the image Testthe auto density _ density to normal calibration Replace it if necessary 4 Replace the engine control board Magenta The magenta toner cartridge is low on 1 Replace the magenta toner Toner Low toner The engine control board switched cartridge on the Dispense Motor for more than 2 Testthe dispense motor 800 seconds in order to raise the image 3 Testthe auto density density to normal calibration Replace it if necessary 4 Replace the engine control board Yellow Toner The yellow toner cartridge is low on 1 Replace the yellow toner Low toner the engine control board switched cartridge on the Dispense Motor for more than 1150 seconds in order to raise the image density to normal Testthe dispense motor Testthe auto density calibration Replace it if necessary Replace the engine control board 28 Phaser 780 Color Printer Error code Description Corrective action and message Media Lowin engine control board detected that 1 Add paper to tray 4 Tray 4 the tray 4 low paper sensor is actuated 2 Check for damaged or missing sensor actuator 3 Replace the tray 4 low sensor 4 Replace the engine control board Media engine control board detected that 1 Add paper to tray 3 Tray 3 the tray 3 low paper sensor is actuated 2 Check for a damaged or missing sensor actuator 3 Replace the tray 3 low sensor
134. the front cover just before the sheet of media reaches the fuser Is there a normal image on the print without mottling If not replace the second bias transfer roller If the image on a print is normal before it passes through the fuser but mottled afterwards replace the fuser roll cartridge If the problem persists replace the fuser Service Guide 59 color If yes remove the top cover Image mis registered on paper 3041 54 4 Replace the paper feeder 5 Replace the engine control board Color layer not correctly registered 3041 55 60 Phaser 780 Color Printer The image area is not centered on the page or the image is bleeding off of the page The printer displays no error code 1 Is the correct weight paper correctly loaded in the tray s or multi purpose tray Ensure the paper guides are correctly set 2 Clean or replace the pick rollers 3 Print Service Print 3 and slide the paper feeder out about 10 seconds after pressing Print The paper should be evenly pre registered 6 mm 1 4 in from the mylar registration guide If correctly registered test the registration clutch Clean the registration rollers If not test the pick solenoid of the tray being used Replace if needed The four color images are not registered correctly and do not form a clean four color image on the page The printer displays no error code 1 Ensure the shipping blocks are removed from t
135. the same image 2 Generate a test print and open the front cover just before the sheet of paper enters the fuser 3 Remove the imaging unit 4 Inspectthe image on the drum Is there a normal image without ghosts visible on the drum If no replace the erase lamp A failing high voltage power supply can also cause ghosting If the customer is consistently printing 250 B size 500 A size prints a day recommend the Hi Duty Fuser Roll Cartridge If fuser damage is excessive replace fuser and install Hi duty Fuser Roll Cartridge Phaser 780 Color Printer 10 Replace the imaging unit Excessive duplexing of the same image can cause ghost images on the imaging unit drum from fuser oil contamination Inspect the image on the surface of the accumulator belt Is there a normal test print image without ghosts visible on the surface of the accumulator belt If a ghost is present visually inspect the operation of the cleaner cam solenoid and the cleaner cam guides located on the fuser assembly If no ghost is present replace the accumulator belt cleaner assembly Generate a test print and open the front cover just as the sheet of paper exits the fuser Inspect the image on the sheet of paper just after the paper exits the Fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has ghost images after it exits the fuser If yes replace the fuser roll cartridge If ghosting con
136. tinues replace the fuser Background contamination There is toner contamination on all or most of the page The contamination appears as a very light gray dusting The printer displays no error code 1 Print Service Print 2 and open the front cover just before the sheet of paper enters the fuser 2 Remove the imaging unit Inspect the image on the drum Is there a normal test print image without background contamination visible on the drum If not replace the high voltage power supply 3 Inspect the image on the surface of the accumulator belt Is there a normal test print image without 3041 50 background visible on the 4 5 surface of the accumulator belt If not replace the accumulator belt assembly Print service Print 2 and open the front cover just as the sheet of paper exits the fuser Inspect the image on the sheet of paper just after the paper exits the fuser Is there a normal test print image on the sheet of paper before entering the fuser but the image has background after it exits the fuser If so replace the fuser roll cartridge If background contamination continues to occur after 20 prints replace the fuser Service Guide 57 Unfused image or image easily rubs off of page d 2 N 2 3041 51 N SY 6 Replace the engine control board Toner on back of print oP 3041 52 The toner image is not completely fused to the paper
137. um or rollers 1 Look for repeating defects inline down the print Refer to the topic Repetitive mark appears on each print on page 56 It discusses caused of repeating spots based onthe distance between the spots Interpreting Sevice Print 5 Yellow Calibration Page Service print 5 is a 100 yellow solid fill Refer to the topic Printing and print quality problems on page 43 for solution to any print problems detected Look for voids repeating spots and banding This solid fill is also useful for flushing out defective yellow toner Service Guide 181 182 Phaser 780 Color Printer Interpreting Sevice Print 6 Magenta Calibration Page Service print 6 is a 100 magenta solid fill Refer to the topic Printing and print quality problems on page 43 for solution to any print problems detected Look for voids repeating spots and banding This solid fill is also useful for flushing out defective magenta toner Interpreting Sevice Print 7 Cyan Calibration Page Service print 7 is a 10096 cyan solid fill Refer to the topic Printing and print quality problems on page 43 for solution to any print problems detected Look for voids repeating spots and banding This solid fill is also useful for flushing out defective cyan toner Interpreting Sevice Print 8 Black Calibration Page Service print 8 is a 100 black solid fill Refer to the topic Printing and print quality problems on page 43 for solution to
138. umber Qty Name and description Effective Discont d 1 118 9822 00 1 Front cover switch right 2 118 9821 00 1 Front cover switch left 3 118 9815 00 1 Exit connector 8 4 118 9814 00 1 Exit connector 4 5 118 9824 00 1 Video harness 6 118 9825 00 1 Laser unit harness 7 118 9796 00 1 Engine control board 8 118 9823 00 1 Paper feeder harness 9 118 9863 00 1 Environmental sensor 10 163 1283 00 1 Print engine NVRAM chip Service Guide 169 780 5 135 Image processor FRUs Phaser 780 Color Printer 170 Table 17 Image processor FRUs Parts Part number Serial number Qty Name and description Effective Discont d 1 118 9826 00 1 Image processor fan 2 118 9885 00 1 Front panel harness 3 671 4303 80 1 Image processor board 4 156 4759 00 1 RAM DIMM 32 Mbytes 156 4765 00 RAM DIMM 64 Mbyte 156 4780 00 RAM DIMM 128 Mbyte 5 671 4759 00 1 Font ROM SIMM Kanji 671 4687 00 1 Font ROM SIMM Simplified Chinese 671 4688 00 1 Font ROM SIMM Traditional Chinese 671 4686 00 1 Font ROM SIMM Korean 6 671 4672 51 PostScript Code SIMM Base v2 86 671 4673 51 PostScript Code SIMM Graphics and Plus v2 86 7 671 4306 50 SCSI riser board 8 671 3994 00 1 Ethernet 100baseT Network card 671 3932 00 1 TokenRing card 671 4034 00 1 LocalTalk card 386 6998 00 1 Blank panel net card 213 1090 00 2 Screws 4 40 x 312 9 119 6032 00 1 CPU Fan 10 650 3886 01 1 Dallas Rea
139. user Oil Life Fuser Unit Life Reset Fuser Life Reset Bias Transfer Roller Life Reset Belt Cleaner Life Perform the appropriate reset function whenever one of these FRUs is replaced to return that FRUS copy count to zero 72 Phaser 780 Color Printer Adjustments This topic discusses using the front panel s interactive mode to review and change the printer s operation It also contains the procedures to calibrate the printer after you replace key Field Replaceable Units and to evaluate the printer s functionality Printing test prints The prints printed via the front panel the are generated by the image processor While the printer is idle you can use the front panel to print an image stored in the image processor such as the configuration page Print service test prints The service prints allow you to evaluate the printer s print quality 1 Press the Printer Menu Select button 2 Select the Help Pages 3 Scroll to either Service Print lor Service Print 2 and press Print Printing the configuration page The configuration page shows a great deal of information regarding the data and set up values stored in NVRAM In the same Help pages menu you can also print the startup page 1 Press the Printer Menu Select button 2 With the Help pages menu displayed scroll to the Configuration Page menu item Press Print Printing the demonstration pages Demo pages demonstrate the capabilities of the printer 1
140. user cavity Reverse these steps to install the accumulator belt cleaner assembly Enter diagnostics and select Reset Accumulator Belt Cleaner Life Rk leaner support 5 E Accumulator belt cleaner assembly 780 5 63 Removing the accumulator belt cleaner assembly Service Guide 121 Second bias transfer roller assembly 1 Remove the fuser assembly as described in Fuser assembly on page 125 2 Remove the accumulator belt cleaner assembly as described in the topic Accumulator belt cleaner assembly on page 121 3 Reach through the empty fuser cavity and slide the second bias transfer roller assembly out of the second bias transfer roller front and rear brackets and out of the printer Reverse these steps to install the second bias transfer roller assembly Second bias transfer roller assembly Removing the second bias transfer roller assembly 122 Phaser 780 Color Printer Second bias transfer roller cam assembly 1 6 Remove the second bias transfer roller assembly as described in Second bias transfer roller assembly on page 122 Remove the second bias transfer roller cam assembly as described in Second bias transfer roller cam assembly on page 123 Remove the waste auger assembly as described in Waste auger assembly on page 117 Remove the three screws securing the second bias transfer roller cam assembly to the printer frame Pull the assembly
141. ut tray Tray than 12 seconds 2 Inspect for damage the output tray full sensor Replace if necessary 3 Replace the engine control board Troubleshooting System power up sequence 1 10 11 12 13 14 The main power switch is turned on Or the front cover is opened and then closed or diagnostics are exited The print engine reads the Customer Replaceable Unit Memory CRUM The print engine determines that all the CRUs are in place except for the toner cartridges The print engine checks its sensors for any static jam errors The print engine reads all life counters in NVRAM The print engine applies voltage to the fuser to bring it up to standby temperature The process motor energizes and then a 1 4 second later the paper feed motor is energized The print engine powers on the carousel motor and checks the presence of the four toner developer assemblies The print engine verifies proper operation of the image process components The auto density calibration sensor checks the density levels The print engine initiates a cleaning cycle of the accumulator belt The process motor is de energized The print engine updates the NVRAM The print engine updates the CRU memory The paper feed motor is de energized The print engine is initialized Service Guide 39 Print engine troubleshooting Printer will not power up When you switch on the printer the control panel does not light the fans do
142. variation in glossiness may occur 118 mm from the print s leading edge Service Guide 61 Random spotting There are spots of toner randomly scattered across the page 1 Slide the paper feeder out of the printer and inspect the top of the registration chute assembly Is the top of the registration chute assembly free of toner If not remove and inspect the waste toner cartridge Make sure the cartridge is not damaged or leaking 2 Remove and inspect the imaging unit Is the exterior of the imaging unit clean and with no obvious toner ar leakage If not remove and am inspect the waste toner 3041 58 cartridge Make sure the 62 cartridge is not damaged or leaking Turn the carousel frame and inspect the four developer assemblies Does each developer assembly appear clean without any obvious toner on the exterior of the assembly or falling from the magnetic brush Clean the dirty developer assembly If the problem reoccurs replace the faulty developer assembly Inspect the fuser Is the fuser free of toner Clean the fuser if necessary Remove and inspect the accumulator belt cleaner assembly Is the accumulator belt cleaner assembly clean and with no obvious toner leakage If not clean or replace the accumulator belt cleaner assembly if necessary With the accumulator belt cleaner assembly removed inspect the accumulator belt cleaner end of the auger Is the auger clogged Clean the printer
143. veloper fan toner dispense motor 204 ENGINE CONTROL BOARD P J17 AG USED CART SENSOR USED CART SENSED H 5VDC SENSOR ON H 5VDC AG CARTRIDGE ne L 5VDC SENSOR ON CH 5VDC CAROUSEL HOME SENSED H 5VDC lt 5VDC gt DEVE CLUTCH ON L 24VDC DEVE FAN H LE SPEED H 24VDC DEVE FAN H 24VDC RTN TONER DISPENSE MOTOR ON L 24VDC Phaser 780 Color Printer DEVE CLUTCH ASSY TONER DISPENSE MOTOR ASSY 3041 22 ENGINE CONTROL BOARD CAROUSEL MOTOR HOLD 1 5VDC CAROUSEL MOTOR ON L 5VDC P J245 5 4 CAROUSEL MOTOR CLOCK T AG A 5VDG 12 gt K 1 P J246 a LOW VOLTAGE POWER SUPPLY Las 24VDC CAROUSEL MOTOR BOARD CAROUSEL MOTOR ASSY 3041 23 Wiring 5 Engine control board low voltage power supply carousel motor board rotary motor Service Guide ENGINE CONTROL BIAS TRANSFER ROLLER BOARD P J19 CAM SOLENOID 24VDC 39 gt 2 1 BTR CAM SOLENOID ON L 24VDC 40 gt 1 2 81 54 87 8 89 12 3 ACCUMULATOR SENSOR 17 12 DO TRO M SENSED L 5VDC 13 lt L 14 AG PAPER FEEDER 26 P H MOTOR ON L 5VDC P H MOTOR HALF SPEED L 5VDC 27 gt 28 AG P H MOTOR FAIL H 5VDC 29 lt 5VDC 30 gt
144. wer supply 9 Measure the voltage between P J133 B1 and frame ground and between P 133 B2 and frame ground on the lower feeder circuit board Is there 24VDC between P J133 B1 and ground and between P J133 B2 and FG If not verify the 24VDC on pins 13 and 14 of the low voltage power supply and the engine control board 10 Replace the lower tray feeder circuit board 11 Replace the engine control board Power problems All front panel indicators remain off The printer does not initialize upon power up Check to see if the printer is plugged in Check the power on off switch Reset the fuser and the paper feeder Bom Refer to the topic Printer will not power up on page 40 Service Guide 65 Front panel indications Media tray indicates missing or empty when it is not 1 If there is media in the tray then check the media sensors If the lower feeder is available switch trays to verify the source of the problem Check to see if the paper empty sensor is broken Run service diagnostics on the media sensors Check the media selection switch actuators on the rear of the paper tray Also check the paper size switches at the rear of the printer frame or the lower feeder Macintosh printing problems Image never prints Printer acts as if it is receiving data but nothing comes out of printer or it goes back to Ready mode without printing image 1 2 Power cycle the printer and print again Make sure
145. witch full stack sensor fuser fan 212 Phaser 780 Color Printer ENGINE CONTROL BOARD fi ei 5VDG 77 SG TEST PRINT ON L 5VDC SG P J11 1 2 r 5 hr H 7 A8 A9 A10 All E 12 A13 A14 H A15 E A16 B1 B2 B3 B4 B5 B6 B7 B8 B9 B10 B11 B12 B13 B14 B15 B16 JP3 2 1 IMAGE PROCESSOR BOARD IMAGE PROCESSOR FAN SG 5VDC FRONT PANEL P J310 gt 175 3041 31 Wiring 13 Engine control board image processor board front panel image processor fan Service Guide BOARD 2 p 2 2222222222222222222222222222222 I I BOARD 1 I I 1 ENGINE CONTROL FEEDER CHUTE SWITCH E P J211 P J175 p Jt6 p J132 P J133 I I FEEDER CHUTE SWITCH I I 1 1 LOW VOLTAGE XT 57177 SIZE SWITCH ASSY POWER SUPPLY P J33 131 I I I SIZE SWITCH ASSY I AAA 579172 SIZE SWITCH ASSY P J171 FEEDER MOTOR FEED SOLENOID 3T TRAY NO PAPER SENSOR P J182 P J213 P J176 FEED SOLENOID 3T LOW PAPER SENSOR P J178 P J187 FEED

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