Lexmark C 746 Service Manual
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Diagnostic information2-55 5026 Go Back Previous Next 146.xx, 148.xx—Motor (MPF/duplex) error service check Step Questions / actions Yes No 11. Open the rear frame cover. 2. Reseat JDX1 cable. Does the problem persist?Go to step 2. Problem resolved. 21. Remove the tray. 2. Check the MPF/duplex gear for any damage. 3. Check if the MPF/duplex gear can engage the duplex drive gear. 4. Manually turn the gear and check for any damage. Does the error still exist?Replace the MPF/duplex gear. See “Multipurpose feeder (MPF)/duplex gear and housing removal” on page 4-123.Go to step 3. 31. Open the front door cover. 2. Disengage the duplex belt connecting to duplex drive gear/duplex rollers. The duplex reference edge assembly should not turn for isolation. 3. Remove the input tray. 4. Bring the printer up in Diagnostics Menu (Turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 5. Navigate to MOTOR TESTS > Duplex > Forward or Reverse. 6. Navigate to MOTOR TESTS > MPF Test> Forward or Reverse. Does the error still exist?Go to step 4. Go to step 7. 41. Connect a new MPF motor with cable to the JDX1 connector on the system board from outside of the machine. 2. Bring the printer up in Diagnostics Menu (Turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 3. Navigate to MOTOR TESTS > Duplex > Forward or Reverse. Note: Perform this test for 5 to 10 seconds only. 4. Navigate to MOTOR TESTS > MPF Test> Forward or Reverse. Note: Perform this test for 5 to 10 seconds only. 5. Check if the motor would turn for each test. Does this clear the problem?Go to step 5. Replace the system board. See “System board removal” on page 4-155.
2-56Service Manual 5026 Go Back Previous Next 51. Disconnect the MPF motor cable on the motor side. 2. Connect a new motor from outside of the machine. 3. Bring the printer up in Diagnostics Menu (Turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to MOTOR TESTS > Duplex > Forward or Reverse. Note: Perform this test for 5 to 10 seconds only. 5. Navigate to MOTOR TESTS > MPF Test> Forward or Reverse. Note: Perform this test for 5 to 10 seconds only. 6. Check if the motor would turn for each test. Does the error still exist?Go to step 6. Replace the MPF duplex motor assembly. See “Multipurpose feeder (MPF)/duplex motor assembly removal” on page 4-125. 6Connect a new MPF motor cable to the old MPF motor and connect it to JDX1 connector on the system board. Does the error still exist?Go to step 7. Replace the MPF/duplex motor cable. See “Multipurpose feeder (MPF)/duplex motor cable removal” on page 4-128. 71. Open the front door cover. 2. Check the duplex reference edge guide assembly for any damage. 3. Check rollers and belts for damage and misalignment. 4. Bring the printer up in Diagnostics Menu (Turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 5. Remove the input tray. 6. Navigate to MOTOR TESTS > Duplex > Forward. 7. Check if the duplex assembly runs. 8. Check if the MPF/duplex gear turns. Is the duplex reference edge guide assembly free of damage?Replace the duplex reference edge guide assembly. See “Duplex reference edge guide assembly removal” on page 4-87.Go to step 8. 81. Check the front door assembly gears that engages to the MPF/duplex gear for any damage. 2. Close the front door assembly and open the front door cover. 3. Check if the front door cover assembly gears can engage the MPF/duplex gear. 4. Manually turn the gears. 5. Check the front door assembly for any damage. Is the front door assembly gear or the front door assembly damaged?Replace the front door assembly. See “Front door assembly removal” on page 4-100.Go to step 9. Step Questions / actions Yes No
Diagnostic information2-57 5026 Go Back Previous Next 147.xx, 920.01—POST (power-on self test) aligner error service check 91. Check the MPF tray for any damage. 2. Manually turn the MPF gear on the tray, and check if the MPF pick arm assembly would turn. 3. Bring the printer up in Diagnostics Menu (Turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Lift the MPF pick arm using the lever. 5. Select MOTOR TESTS > MPF > Forward. 6. Check if the pick arm would turn. Is the MPF pick arm assembly free of damage?Go to step 10. Replace the input tray. 10Remove the input tray and insert a new one. Does this fix the problem?Problem resolved. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 11. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check JFDPCK1 connector for proper connection and damage. 4. Reseat the connector. 5. POR the printer. 6. Perform a print test. Is the problem still present?Go to step 2. Problem resolved. 2Check the cable in the connector JFDPCK1 for pinch points and for any other damage to the cable or connector. Is the cable damaged?Replace paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137.Go to step 3. 31. Disconnect the cable in connector JFDPCK1 and connect the cable from the new paper pick mechanism to JFDPCK1. Let the paper pick assembly hang. 2. Close the front cover and install the waste box on the side of the printer. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to MOTOR TESTS > Align Motor Test > Forward. Does the aligner motor run?Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No
2-58Service Manual 5026 Go Back Previous Next 155.xx—Cam motor error service check Step Questions / actions Yes No 11. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the motor driver cable in connector JDVR1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. Is the cable damaged?Replace the motor driver cable. See “Motor driver cable removal” on page 4-122.Go to step 2. 2Remove the right cover. See “Right cover removal” on page 4-51. Check the motor driver cable (A) for proper connection to the EP drive assembly, pinch points for the cable, and damage for the cable or connector. Is the cable damaged?Replace the motor driver cable. See “Motor driver cable removal” on page 4-122. Go to step 3. 3Check the CAM motor cable from the cam motor to the motor driver card for poor connections or damage. Is the cable damaged?Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90.Go to step 4. 4Measure the continuity across all of the fuses on the system board. Are any of the fuses blown?Replace the system board. See “System board removal” on page 4-155.Go to step 5.
Diagnostic information2-59 5026 Go Back Previous Next 5Visually inspect the motor driver card. Is the motor driver card damaged?Replace the motor driver card. See “Motor driver card removal” on page 4-121.Go to step 6. 61. Connect a new motor driver card without mounting it to the printer. 2. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 3. Navigate to MOTOR TESTS > CAM. Did the motor run?Install the new motor driver card.Go to step 7. 71. Reinstall old motor driver card to the printer. 2. Plug in the CAM motor of the EP drive assembly to the EP driver card electrically without installing it into printer. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to MOTOR TESTS > CAM. Did the motor run?Replace EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90.Replace system board. See “System board removal” on page 4-155. Step Questions / actions Yes No
2-60Service Manual 5026 Go Back Previous Next 156.xx—COD (Color On Demand) motor service check 160.xx, 161.xx—Motor Error (option tray 2) service check Step Questions / actions Yes No 11. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the cable in connector JBOR1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. Is the cable damaged?Replace the COD assembly. See “Color on demand assembly removal” on page 4-70.Go to step 2. 2Measure the continuity across all of the fuses on the system board. Are any of the fuses blown?Replace the system board. See “System board removal” on page 4-155.Go to step 3. 31. Disconnect the cable in connector JBOR1 and then connect the cable from the new COD group assembly. 2. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 3. Navigate to MOTOR TESTS > COD > Forward. If nothing happens, select Reverse. Did the COD motor pass the test?Replace the COD assembly. See “Color on demand assembly removal” on page 4-70.Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 11. Turn the printer off. 2. Reseat option tray 2. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to PRINT TESTS > Tray 2 > Single. Did the page print?Problem resolved. Go to step 2. 21. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the option cable in connector JOPT1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 3.
Diagnostic information2-61 5026 Go Back Previous Next 162.xx, 163.xx—Motor Error (option tray 3) service check 3Remove the right cover. See “Right cover removal” on page 4-51. Check the option cable for pinch points and any damage. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 4. 4Is the option tray 2 the high-capacity input tray (2,000-sheet feeder)?Replace the HCIT top plate assembly. See “Top plate assembly removal” on page 4-206.Replace the option tray 2 assembly. Step Questions / actions Yes No 11. Turn the printer off. 2. Reseat option tray 3. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to PRINT TESTS > Tray 3 > Single. Did the page print?Problem resolved. Go to step 2. 21. Remove all input options connected to the machine. 2. Connect tray 3 directly on the printer making it tray 2. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, and turn on the printer). 4. Navigate to PRINT TESTS > Tray 2 > Single. Did the page print?Go to step 3. Go to step 4 3Check the top and bottom autoconnect connectors of tray 2 (input option above tray 3) for damages. Are the autoconnect connectors damaged?Replace tray 2 550 input optionGo to step 4. 4Check the top and bottom autoconnect connectors of tray 3 for damages. Are the autoconnect connectors damaged?• For 550 option, replace tray 3 550 input option. • For HCIT, replace the HCIT top plate assembly.Go to step 5. Step Questions / actions Yes No
2-62Service Manual 5026 Go Back Previous Next 164.xx, 165.xx—Motor Error (option tray 4) service check 51. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the option cable in connector JOPT1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. 4. Remove the right cover. See “Right cover removal” on page 4-51, 5. Check the option cable for pinch points and any damage. 6. Check the autoconnect connector for damage. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. • For 550 option, replace tray 3 550 input option. • For HCIT, replace the HCIT top plate assembly. Step Questions / actions Yes No 11. Turn the printer off. 2. Reseat option tray 4. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to PRINT TESTS > Tray 4 > Single. Did the page print?Problem resolved. Go to step 2. 2Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Check the option cable in connector JOPT1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 3. 3Remove the right cover. See “Right cover removal” on page 4-51. Check the option cable for pinch points and any damage. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 4. Step Questions / actions Yes No
Diagnostic information2-63 5026 Go Back Previous Next 166.xx, 167.xx—Motor Error (option tray 5) service check 4Is the option tray 4 the high-capacity input tray (2,000-sheet feeder)?Replace the HCIT top plate assembly. See “Top plate assembly removal” on page 4-206.Replace the option tray 4 assembly. Step Questions / actions Yes No 11. Turn the printer off. 2. Reseat option tray 5. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to PRINT TESTS > Tray 5 > Single. Did the page print?Problem resolved. Go to step 2. 21. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the option cable in connector JOPT1) on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 3. 3Remove the right cover. See “Right cover removal” on page 4-51. Check the option cable for pinch points and any damage. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 4 4Is the option tray 5 the high-capacity input tray (2,000-sheet feeder)?Replace the HCIT top plate assembly. See “Top plate assembly removal” on page 4-206.Replace the option tray 5 assembly. Step Questions / actions Yes No
2-64Service Manual 5026 Go Back Previous Next 168.xx—Motor (HCIT elevator) error service check 200.11, 250.03—Paper Jam error service check Step Questions / actions Yes No 1Is the paper properly loaded in the high- capacity input tray (HCIT)?Go to step 2. Fan the media, and then stack flat in the HCIT drawer. 21. Turn the printer off. 2. Reseat option the HCIT option. 3. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to PRINT TESTS > HCIT > Single. Did the error clear?Problem resolved. Go to step 3. 31. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check the option cable in connector JOPT1 on the system board for proper connection, for cable pinch points, and for any other damage to the cable or connector. Is the cable damaged?Replace the option cable. See “Option cable removal” on page 4-135. Go to step 4. 41. Remove the HCIT right cover. See“HCIT right cover removal” on page 4-196. 2. Check the cable in the HCIT. Is the cable damaged?Replace the elevator-up cable.Replace the elevator motor with sensor. See “HCIT elevator motor with sensor removal” on page 4-200. Step Questions / actions Yes No 1Open the front access door. Turn the transport belt gear clockwise. Did the transport belt move?Go to step 2. Replace the transport belt. See “Transfer module removal” on page 4-171.