Lexmark C 746 Service Manual
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Diagnostic information2-65 5026 Go Back Previous Next 201.06, 201.08, 201.31—Paper Jam error service check 2Run align motor test with old pick assembly installed in the machine. 1. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Navigate to MOTOR TESTS > Align Motor Test > Forward. Can you hear the align motor run?Go to “920.06—Input sensor service check” on page 2-99.Go to step 3. 31. Plug in the new pick assembly into the JFDPCK1 connector from outside 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 > Align Motor Test > Forward. Can you hear the align 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 1Open the front access door. Turn the transport belt gear clockwise. Did the transport belt move?Go to step 2. Replace the transport module. See “Transfer module removal” on page 4-171. 21. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Perform the Align Motor Test. See “Motor tests” on page 3-10. Can you hear the align motor run?Go to step 3. Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137. Step Questions / actions Yes No
2-66Service Manual 5026 Go Back Previous Next 3Turn the printer off, and then remove the fuser. See “Fuser removal” on page 4-110. Is the exit sensor flag damaged?Replace the fuser. See “Fuser removal” on page 4-110. Go to step 4. 4Verify the paper is loaded properly in the paper tray or manual feed slot. Is the paper properly loaded?Go to step 5. Load paper correctly. 51. Replace the fuser. See “Fuser removal” on page 4-110. Note: Do not reset the fuser count until the problem is resolved. 2. Turn the printer off. 3. POR the printer. Did the error clear?Problem resolved Replace the original fuser, and go to step 6. 6Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Check the fuser DC cable in the connector JFUSER1 for proper connection to the system board, for pinch points, and for any other damage to the cable or the connector. Is the cable damaged?Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-113. Go to step 7 71. POR the printer. 2. Place a voltmeter between pin 8 and pin 6 on the JFUSER1 connector. Does the meter read +5 V dc?Go to step 8. Replace the system board. See “System board removal. Step Questions / actions Yes No Pin 6 (ground) Pin 8
Diagnostic information2-67 5026 Go Back Previous Next 8Place a voltmeter between Fuser DC autoconnect pin 8 and ground (pin 6). Does the meter read +5 V dc?Go to step 9. Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-113. 91. Replace the fuser. See “Fuser removal” on page 4-110. 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 SENSOR TESTS > Dynamic Sensors > Fuser Exit. 4. Open the front access door and the top access cover. Did the fuser exit sensor change from Open to Closed?Problem resolved Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No
2-68Service Manual 5026 Go Back Previous Next 203.09—Paper Jam error service check 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. 2Turn the printer off, and then remove the fuser. See “Fuser removal” on page 4-110. Is the exit sensor flag damaged?Replace the fuser. See “Fuser removal” on page 4-110. Go to step 3. 3Verify the paper is loaded properly in the paper tray or manual feed slot. Is the paper properly loaded?Go to step 4. Load paper correctly. 4Replace the fuser. See “Fuser removal” on page 4-110. POR the printer. Did the error clear?Problem resolved. Remove the new fuser, and go to step 5. 51. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 2. Check the fuser DC cable in the connector JFUSER1 for proper connection to the system board, for pinch points, and for any other damage to the cable or the connector. Is the cable damaged?Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-113. Go to step 6.
Diagnostic information2-69 5026 Go Back Previous Next 61. POR the printer. 2. Place a voltmeter between pin 8 and pin 6 (ground) on the JFUSER1 connector on the system board. 3. Does the meter read +5 V dc?Go to step 7. Replace the system board. See “System board removal” on page 4-155. 7Place a voltmeter between the fuser autoconnect pin 8 and ground (6). Does the meter read +5 V dc?Go to step 8. Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-113. Step Questions / actions Yes No Pin 6 (ground) Pin 8
2-70Service Manual 5026 Go Back Previous Next 230.03, 230.05—Paper Jam error service check 81. Replace the fuser. See “Fuser removal” on page 4-110. 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 SENSOR TESTS > Dynamic Sensors > Fuser Exit. 4. Open the front access door and top access cover. 5. Activate the fuser exit sensor. 6. Did the fuser exit sensor change from Open to Closed?Problem resolved. Replace the system board. See “Fuser removal” on page 4-110. Step Questions / actions Yes No 1Check the tray for any damage. Is the tray damaged?Replace the tray. Go to step 2. 2Check the MPF duplex gear for any damage. Is the MPF Duplex gear damaged?Replace the MPF duplex gear. See “Multipurpose feeder (MPF)/duplex gear and housing removal” on page 4-123.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 MPF/duplex motor cable in connector JDX1 for proper connection to the system board, cable pinch points, and any other damage to the cable or connector. Is the cable damaged?Replace the MPF duplex motor cable. See “Multipurpose feeder (MPF)/duplex motor cable removal” on page 4-128. 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. Step Questions / actions Yes No
Diagnostic information2-71 5026 Go Back Previous Next 242.02—Paper Jam service check 5• Check the front access cover for any damage. • Make sure the front access cover can close correctly. • Check the front access cover if its securely fastened to its hinge. Is the front access cover damaged?Replace the front access cover. See “Front access cover assembly removal” on page 4-29. Go to step 6. 61. Check the duplex reference edge guide assembly for damages. 2. Check the gears, rollers and belt for damage and contamination. Manually turn the gears. Is the duplex reference edge guide assembly damaged?Replace the duplex reference edge guide assembly. See “Duplex reference edge guide assembly removal” on page 4-87. Go to step 7. 71. Check the front door for any damage. 2. Check the paper path for any obstruction. 3. Check roller gears for any damage. Is the front door assembly damaged?Replace the front door assembly. See “Front door assembly removal” on page 4-100.Go to step 8. 81. Remove the right cover. See “Right cover removal” on page 4-51. 2. Check the MPF duplex motor assembly for proper installation. 3. Check the connectors. Reseat the connector on the motor side and JDX1 on the system board. Is the MPF duplex motor assembly damage?Replace the MPF duplex motor assembly. See “Multipurpose feeder (MPF)/duplex motor assembly removal” on page 4-125.Go to “920.06—Input sensor service check” on page 2-99. Step Questions / actions Yes No 1Has paper been fed from an input option before?Go to step 4. 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. Remove the right cover. See “Right cover removal” on page 4-51. 4. Check the cable in connector JOPT1 for proper connection to the system board, cable pinch points, and 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. Step Questions / actions Yes No
2-72Service Manual 5026 Go Back Previous Next 242.03, 242.11—Paper Jam service check 3Carefully lift the printer off the option, and lay the printer on its back. Check the option connector for damage. Is the option cable connector or cable damaged?Replace the option cable. See “Option cable removal” on page 4-135.Go to step 4. 4Replace the complete tray 2 option. Does the error clear?Problem resolved. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 11. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Select PRINT TESTS. 3. Select a tray below tray 2 4. Select Single. Did the page feed correctly?Problem resolved. Go to step 2. 21. Turn the printer off. 2. Open the front access door. 3. Turn the transport belt gear clockwise. Did the transport belt move?Go to step 3. Replace the transport belt. See “Transfer module removal” on page 4-171 31. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Navigate to MOTOR TESTS > Align Motor Test. Can you hear the align motor run?Go to step 4. Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137. Step Questions / actions Yes No
Diagnostic information2-73 5026 Go Back Previous Next 242.05—Paper Jam service check 4Is tray 2 a high-capacity input tray (2,000- sheet feeder)?Replace the HCIT top plate. See “Top plate assembly removal” on page 4-206. Replace the entire tray 2 option. Step Questions / actions Yes No 1Has the paper been fed from an input option before?Go to step 5. Go to step 2. 21. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Navigate to PRINT TESTS > select a tray below tray 2 > Single. Did the page feed correctly?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. Remove the right cover. See “Right cover removal” on page 4-51. 4. Check the cable in connector JOPT1 for proper connection to the system board, cable pinch points, and 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. Step Questions / actions Yes No
2-74Service Manual 5026 Go Back Previous Next 242.10—Paper Jam service check 4Carefully lift the printer off the option, and lay the printer on its back. Check the option connector for damage. Is the connector damaged?Replace the option cable. See “Option cable removal” on page 4-135.Go to step 5. 5Is tray 2 a high-capacity input tray (2,000- sheet feeder)?Go to step 7. Go to step 6. 6Replace the tray 2 option. Does the error clear?Problem resolved. Replace the system board. See “System board removal” on page 4-155. 7Replace the HCIT top plate. See “Top plate assembly removal” on page 4-206.Problem resolved. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 11. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 2. Navigate to PRINT TESTS > select a tray below tray 2 > Single. Did the page print correctly?Problem resolved. Replace the complete tray 2 option. Step Questions / actions Yes No