Lexmark C 746 Service Manual
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Diagnostic information2-95 5026 Go Back Previous Next 19Replace the modem. Restart the device. Does the 900.xx error reoccur?Go to step 31. Problem resolved. 20Run a fax job. Does the 900.xx error reoccur?Go to step 31. Go to step 21. 21Are there any ISP (internal solutions port) options installed?Go to step 22. Problem resolved. 22Reinstall the first ISP option. Restart the device. Does the 900.xx error reoccur?Go to step 24. Go to step 23. 23Run a job to test the option. Does the 900.xx error reoccur?Go to step 24. Go to step 26. 24Upgrade the firmware. Contact your next level of support for the correct firmware level to use. Restart the printer to operating mode. Does the 900.xx error reoccur?Go to step 25. Problem resolved. 25Replace the faulty ISP option. Restart the device. Does the 900.xx error reoccur?Go to step 31. Go to step 26. 26Are there any more ISP options to install? Go to step 27 Problem resolved. 27Install the next ISP option. Restart the device. Does the 900.xx error reoccur?Go to step 29. Go to step 28. 28Run a job to test the option. Does the 900.xx error reoccur?Go to step 29. Go to step 26. 29Upgrade the firmware. Contact your next level of support for the correct firmware level to use. Restart the printer to operating mode. Does the 900.xx error reoccur?Go to step 30. Go to step 26. 30Replace the faulty ISP option. Restart the device. Does the 900.xx error reoccur?Go to step 31. Go to step 26. 31Contact your next level of support. You will need the following information for them: • Exact 900.xx error digits and complete error message • Printed menu settings page • Printed network settings page • Device error log • A sample print file if error appears to be isolated to a single file • File/Application used if error is related to specific print file • Device Operating System • Driver used (PCL/PS) • Frequency of the occurrence of the error Step Action and questions Yes No
2-96Service Manual 5026 Go Back Previous Next 900.05—Transfer module error service check 902.59—Engine software error, NVRAM MGR problem 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 transport cable in connector JTPS1 for proper connection to the system board. 4. Open the front access door and check the transport cable for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the transport cable. See “Transport cable removal” on page 4-173. Go to step 2. 2Replace the transfer module. Does the error clear?Problem resolved. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 11. Turn off the printer. 2. Remove the rear frame cover. See “Rear frame cover removal” on page 4-47. 3. Check JPH1 and JTPS1 for proper connection and damage. 4. Check the transport cable on the transfer belt module side for any damage. Is either of the cables damaged?If the JTPS1 cable is damaged, replace the JTPS1 cable. If the JPH1 cable is damaged, replace the printhead assembly. See “Printhead removal, installation, and adjustment” on page 4-145Go to step 2. 21. Reseat the JPH1 and JTPS1 cables. 2. Reseat the transport cable on the transfer belt module side. 3. Power on the printer. Does the problem persist?Go to step 3. Problem resolved. 3Install a new transfer module to verify if the old transfer module is defective. Does the problem persist?Go to step 4. Replace the transfer module. See “Transfer module removal” on page 4-171. 4Connect a new transport cable from outside of the machine. Does the problem persist?1. Return the old transfer module and transport cable. 2. Go to step 5.Replace the transport cable. See “Transport cable removal” on page 4-173. 5Connect a new printhead assembly from outside of the printer and verify the printhead. See “Printhead verification” on page 3-39. Does the problem persist?Replace the system board. See “System board removal” on page 4-155.Replace the printhead assembly. See “Printhead removal, installation, and adjustment” on page 4-145
Diagnostic information2-97 5026 Go Back Previous Next 920.03, 920.25—Transfer Module Missing or not connected service check 920.04—POST (power-on self test) fuser motor not connected error service check Step Questions / actions Yes No 1Open the front access door. Reseat the transport cable. Does the error clear?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. Reseat the transport cable in connector JTPS1. Does the error clear?Problem resolved. Go to step 3. 3Check the transport cable in connector JTPS1 for pinch points and for any other damage to the cable or connector. Is the cable damaged?Replace the transport cable. See “Transport cable removal” on page 4-173. Go to step 4. 4Replace the transport belt assembly. See “Transfer module removal” on page 4-171. Does the error clear?Problem resolved. Go to step 5. 5Connect a new transport cable to the transfer belt module and the system board from outside of the machine. Does the error clear?Replace the transport cable. See “Transport cable removal” on page 4-173. Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 1Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Reseat the cables in connectors JCARTP1) and JCARTS1. Does the error clear?Problem resolved. Go to step 2.
2-98Service Manual 5026 Go Back Previous Next 920.05—POST (power-on self test) printhead motor not connected error service check 2Check the cartridge motor 1/fuser cable in connector JCARTP1 and JCARTS1 for pinch points and the cables or connectors for any other damage. Are the cables damaged?Replace the cartridge motor1/fuser cable. See “Cartridge motor 1/fuser cable removal” on page 4-67. Go to step 3. 3Remove the right cover.See “Right cover removal” on page 4-51. Check the cartridge motor 1/fuser motor cable (A) for proper connection to the EP drive assembly, pinch points for the cable, and damage to the cable or connector. Is either cable damaged?Replace the cartridge motor 1/fuser motor cable. See “Cartridge motor 1/ fuser cable removal” on page 4-67.Go to step 4. 41. Disconnect the cable connecting motor 1/ fuser motor cable and cartridge motor 2/ motor 3, and connect the cable to the new EP drive assembly outside the machine. 2. POR the printer, then check if the error remains. Did the error clear?Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90.Go to step 5. 5Connect a new cartridge motor1/fuser motor cable to the old EP drive assembly without installing it into the machine. Did the error clear?Replace the cartridge motor 1/fuser motor cable. See “Cartridge motor 1/ fuser cable removal” on page 4-67.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. Reseat the cables in connector JMIRR1. Does the error clear?Problem resolved. Go to step 2. 2Check the cables in connector JMIRR1 for pinch points and any other damage to the cables or connectors. Is the cable damaged?Replace the printhead. See “Printhead removal, installation, and adjustment” on page 4-145.Go to step 3. Step Questions / actions Yes No
Diagnostic information2-99 5026 Go Back Previous Next 920.06—Input sensor service check 920.07—POST (power-on self test)—Narrow media sensor error service check 3Measure 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 4. 41. Perform the printhead verification to check whether the new printhead solves the problem. See “Printhead verification” on page 3-39. 2. Navigate to PRINTHEAD TESTS > Mirror Motor Test. Did the mirror motor pass the test?Replace the printhead. See “Printhead removal, installation, and adjustment” on page 4-145.Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No 1Is the input sensor flag damaged? Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137. 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 cable in connector JTRAY1 for proper connection to the system board, for pinch points, and any other damage to the cable or connector. Is the cable damaged?Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137.Go to step 3. 31. Disconnect the cable in connector JTRAY1. 2. Connect the cable from the new paper pick assembly in connector JTRAY1. 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 SENSOR TESTS > Dynamic Sensors > Input. 5. Activate the input sensor. Did the input sensor change from Open to Closed?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 1Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Reseat the cable in connector JTRAY1. Does the error clear?Problem resolved. Go to step 2. 2Check the cable in connector JTRAY1 for pinch points and the cable or connector for any other damage. Is the cable damaged?Replace the paper pick mechanism. See “Paper pick mechanism assembly removal” on page 4-137. Go to step 3. Step Questions / actions Yes No
2-100Service Manual 5026 Go Back Previous Next 920.08—Exit sensor service check 3POR the printer. Place a voltmeter between JTRAY1(pin 4), and ground (pin 1). Does the meter read 5 V dc?Go to step 4. Replace the system board. See “System board removal” on page 4-155. 41. Disconnect the cable in JTRAY1. 2. Connect the cable from the new paper pick mechanism. 3. Bring the printer up in Diagnostic menu (turn off the printer, press and hold buttons 3 and 6, then turn on the printer). 4. Navigate to SENSOR TESTS > Dynamic Sensors > Narrow Media. 5. Activate the narrow media sensor. Did the narrow media sensor change from Closed to Open?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 1Verify the paper is loaded properly in the paper tray or manual feed slot. Is the paper properly loaded?Go to step 2. Load paper correctly. 21. Turn the printer off. 2. Install the new fuser. See “Fuser removal” on page 4-110 Note: Do not reset fuser count or run motor calibration yet. 3. POR the printer. Did the error clear?Problem resolved. Note: Complete the fuser installation: reset fuser count and run motor calibration. See “Fuser removal” on page 4-110.Remove the new fuser, and go to step 3. 3Remove 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 4. Step Questions / actions Yes No
Diagnostic information2-101 5026 Go Back Previous Next 4Place a voltmeter between the fuser DC autoconnect pin 8 and ground (pin 6). Does the meter rear +5 V dc?Go to step 6. Go to step 5. 5Place a voltmeter between the connector JFUSER1 pin 8 and ground (pin 6) on the system board. Does the meter read +5 V dc?Go to step 6. Replace the fuser DC cable. See “Fuser DC cable removal” on page 4-113. 61. Replace the fuse without resetting the fuser count. 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 door, and then the top access cover. 5. Activate the fuser exit sensor. Did the fuser exit sensor change from Open to Closed?Replace fuser and reset the fuser count. See “Fuser removal” on page 4-110.Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No
2-102Service Manual 5026 Go Back Previous Next 920.09—POST (power-on self test)—Four toner sensors not connected 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. Reseat the cable in connector JHVPS1. Does the error clear?Problem resolved. Go to step 2. 2Check the HVPS cable in connector JHVPS1 for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the HVPS cable. See “High-voltage power supply (HVPS) cable removal” on page 4-117. Go to step 3. 31. Remove the left cover. See “Left cover removal” on page 4-31. 2. Reseat and check all the toner level sensor cables (A) connected to the rear of the HVPS for damages and if they are installed correctly. Does the problem persist?Go to step 4. Problem resolved. 4Connect four new toner level sensors outside the machine and perform a POR. Note: Keep track of which sensors change the error code to reduce the number of failing sensors. Keep the old sensor which does not reduce the failing number, leaving three new sensors and no error reported. Does the problem persist?Remove the four new toner level sensors and go to step 5.Replace the failing toner level sensors. See “Toner level sensor removal” on page 4-163. 5Replace the HVPS board. See “High-voltage power supply (HVPS) removal” on page 4-115. Does the error clear?Problem resolved. Go to step 6. 61. Install the old HVPS back to the machine. 2. Replace the HVPS cable. See “High- voltage power supply (HVPS) cable removal” on page 4-117 Does the problem persist?Replace the system board. See “System board removal” on page 4-155.Problem resolved.
Diagnostic information2-103 5026 Go Back Previous Next 920.10—POST—Three toner sensors not connected error service check Step Questions / actions Yes No 1Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Reseat the cable in connector JHVPS1. Does the error clear?Problem resolved. Go to step 2. 2Check the HVPS cable in connector JHVPS1 for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the HVPS cable. See “High-voltage power supply (HVPS) cable removal” on page 4-117. Go to step 3. 3Remove the left cover. See “Left cover removal” on page 4-31. Reseat then and check all the toner level sensor cables (A) connected to the rear of the HVPS for damages and if they are installed correctly. Does the problem persist?Go to step 4. Problem resolved. 4Connect four new toner level sensors outside the machine and perform a POR. Note: Keep track of which sensors change the error code to reduce the number of failing sensors. Keep the old sensor which does not reduce the failing number, leaving three new sensors and no error reported. Does the problem persist?Go to step 5. Replace the failing toner level sensors. See “Toner level sensor removal” on page 4-163. 5Replace the HVPS board. See “High-voltage power supply (HVPS) removal” on page 4-115. Does the error clear?Problem resolved. Go to step 6. 61. Install the old HVPS back to the machine. 2. Replace the HVPS cable. See “High- voltage power supply (HVPS) cable removal” on page 4-117 Does the problem persist?Replace the system board. See “System board removal” on page 4-155.Problem resolved.
2-104Service Manual 5026 Go Back Previous Next 920.11—POST (power-on self test)—Two toner sensors not connected error service check Step Questions / actions Yes No 1Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Reseat the cable in connector JHVPS1. Does the error clear?Problem resolved. Go to step 2. 2Check the HVPS cable in connector JHVPS1 for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the HVPS cable. See “High-voltage power supply (HVPS) cable removal” on page 4-117. Go to step 3. 3Remove the left cover. See “Left cover removal” on page 4-31. Reseat then and check all the toner level sensor cables (A) connected to the rear of the HVPS for damages and if they are installed correctly. Does the problem persist?Go to step 4. Problem resolved. 4Connect four new toner level sensors outside the machine and perform a POR. Note: Keep track of which sensors change the error code to reduce the number of failing sensors. Keep the old sensor which does not reduce the failing number, leaving three new sensors and no error reported. Does the problem persist?Go to step 5. Replace the failing toner level sensors. See “Toner level sensor removal” on page 4-163. 5Replace the HVPS board. See “High-voltage power supply (HVPS) removal” on page 4-115. Does the error clear?Problem resolved. Go to step 6. 61. Install the old HVPS back to the machine. 2. Replace the HVPS cable. See “High- voltage power supply (HVPS) cable removal” on page 4-117 Does the problem persist?Replace the system board. See “System board removal” on page 4-155.Problem resolved.