Lexmark C 746 Service Manual
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Diagnostic information2-105 5026 Go Back Previous Next 920.12—POST (power-on self test)—One toner sensor 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 sensor. 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.
2-106Service Manual 5026 Go Back Previous Next 920.13—POST (power-on self test) cartridge motor 1 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 cables in connectors JCARTP1 and JCARTS1. Does the error clear?Problem resolved. Go to step 2. 2Check the cables in connectors JCARTP1 and JCARTS1 for pinch points and any other damage to the cables or connectors. Is the cable damaged?Replace the cartridge motor 1/fuser cable. See “Cartridge motor 1/fuser cable removal” on page 4-67. Go to step 3. 3Remove the right cover. Check the cartridge motor 1/fuser motor cable (A) for proper connection to the EP drive assembly, pinch points for the cable, or any other 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. 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. 5Plug in a new EP drive assembly cartridge motor 1 with the old cable from outside the machine. Does the problem persist?Go to step 6. .Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90. 6Plug in a new EP drive assembly cartridge motor 1 with a new cable from outside the machine. Does the problem persist?Replace the system board. See “System board removal” on page 4-155.Replace cartridge motor 1/ fuser cable. See “Cartridge motor 1/fuser cable removal” on page 4-67
Diagnostic information2-107 5026 Go Back Previous Next 920.14—POST (power-on self test)—Cartridge motor 2 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 cables in connector JCARTP2 and JCARTS2. Does the error clear?Problem resolved. Go to step 2. 2Check the cable in connector JCARTP2 and JCARTS2 for pinch points and any other damage to the cable or connector. Are the cables damaged?Replace the cartridge motor 2/3 cable. See “Cartridge motor 2/3 cable removal” on page 4-69. Go to step 3. 3Remove the right cover. See “Right cover removal” on page 4-51. Check the cartridge motor 2/3 cable for the proper connection to the EP drive assembly, pinch point for the cable, or damage to the cable or connectors. Is either cable damaged?Replace the cartridge motor 2/3 cable. See “Cartridge motor 2/3 cable removal” on page 4-69. 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 4-157.Go to step 5. 5Connect a new cartridge motor 1/fuser cable from the outside of the machine. Did the error clear?Replace the cartridge motor 1/fuser cable. See “Cartridge motor 1/fuser cable removal” on page 4-67.Go to step 6. 6Connect the old cartridge motor 1/fuser motor cable to a new EP drive assembly outside of the machine. Did the error clear?Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90Replace system board. See “System board removal” on page 4-155.
2-108Service Manual 5026 Go Back Previous Next 920.15, 920.20—POST (power-on self test)—Bad transfer module NVRAM data error service check 920.16—POST (power-on self test)—Bad printhead NVRAM data 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 4-37. 3. Check the JTPS1 connector for any damage, and then reseat the JTPS1 cable. 4. Check the transport cable connection to the transport belt for any damages. a.Open the front door cover b.Reseat the transport cable in the transfer belt module. Did the error clear?Problem resolved. Go to step 2. 2Replace the transfer belt module. See “Transfer module removal” on page 4-171. Does the problem persist?Go to step 3. Problem resolved. 3Connect a new transport cable from outside of the machine. Does the problem persist?Return the old transport belt module and old transport cable then replace the system board. See “System board removal” on page 4-155.Return the old transport belt module and replace the transport cable. See “Transport cable removal” on page 4-173. 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 large printhead cable in connector JPH1. Does the error clear?Problem resolved. Go to step 2. 2Check the cable in connector JPH1 for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the printhead. See “Printhead removal, installation, and adjustment” on page 4-145.Go to step 3. 3Perform the printhead verification to check whether the printhead replacement fixes the problem. See “Printhead verification” on page 3-39. POR the printer. Did the error clear?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.
Diagnostic information2-109 5026 Go Back Previous Next 920.17—POST (power-on self test)—Output bin cable 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 bin full sensor cable in connector JBIN1. Does the error clear?Problem resolved. Go to step 2. 2Check the bin full sensor cable in connector JBIN1 for pinch points and any other damage to the cable or connector. Is the cable damaged?Replace the bin full sensor with cable. See “Bin full sensor removal” on page 4-65.Go to step 3. 31. Disconnect the cable in the JBIN1 connector. 2. Connect the new bin full flag cable in the JBIN connector. 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 > Other Sensors > Bin Full Test. 5. Activate the new bin full sensor by placing a sheet of paper in the sensor. Did the bin full sensor change from Open to Closed?Replace the bin full sensor and cable. See “Bin full sensor removal” on page 4-65. Replace the system board. See “System board removal” on page 4-155.
2-110Service Manual 5026 Go Back Previous Next 920.18—POST (power-on self test)—Cartridge motor 3 not connected error service check 920.19—POST (power-on self test)—Transfer module stepper motor not connected error service check Step Questions / actions Yes No 1Turn the printer off and remove the rear frame cover. See “Rear frame cover removal” on page 4-47. Reseat the cables in connectors JCARTP2 and JCARTS2. Does the error clear?Problem resolved. 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. Remove the right cover. See “Right cover removal” on page 4-51. 2. Check the connections on the cartridge motor 2/3 cables and reseat the cables. 3. Check the routing on the cables for pinch points and any other damage to the cables or the connectors. Is the cable free from damage?Replace the cartridge motor 2/3 cable. See “Cartridge motor 2/3 cable removal” on page 4-69. Go to step 4. 4Connect a new Cartridge motor 2/3 cable from outside of the machine, then POR the printer. Note: Verify first if the cable is working properly by testing connections of the cable on motor 2 and 3 to the JCARTP2 and JCARTS2 connectors. Route the cables properly only when you have verified that the cables are working properly. Did the error clear?Replace the cartridge motor 2/3 cable. See “Cartridge motor 2/3 cable removal” on page 4-69. Go to step 5. 5Connect a new EP drive assembly from the outside of the machine. Note: Verify first if the EP drive assembly is working properly. Connect the cables on the fuser motor, cartridge motor 1, 2, and 3 on the new EP drive assembly. Route the cables properly only when you have verified that the cables are working properly. Did the error clear?Return the old cartridge motor 2/3 cable and replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal” on page 4-90Return the old EP drive assembly and the old cartridge motor 2/3 cable, then 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 motor driver cable in connector JDVR1. Does the error clear?Problem resolved. Go to step 2.
Diagnostic information2-111 5026 Go Back Previous Next 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. Open the right cover. 2. Reseat the motor driver cable on the motor driver side (A). 3. Reseat all cables connected to the motor driver card. Did this clear the error?Problem resolved. Go to step 4. 4Note: Connect a new motor driver cable from outside of the machine.Make sure to verify first if the motor driver cable is working properly by connecting one end to the motor driver card, and the other end to the JDVR1 connector on the system board. Route the cables properly only when you have verified that the cable is working properly. Did this clear the error?Replace the motor driver cable See “Motor driver cable removal” on page 4-122. Go to step 5. 5Connect a new transport motor cable. Did this clear the error?Return the original part from the printer and replace the transport motor cable. See “Transport motor cable removal” on page 4-175.Go to step 6. 6Connect a new motor driver card. Did this clear the error?Return the original parts of the printer and replace the motor driver card. See “Motor driver card removal” on page 4-121.Go to step 7. 71. Connect a new EP drive assembly from outside of the machine. 2. Transfer the motor driver card and cables to the new EP drive assembly and connect the cables. Did this clear the error?Replace the EP drive assembly and connect the original parts back to the machine. See “Electrophotographic (EP) drive assembly removal” on page 4-90.Replace the system board. See “System board removal” on page 4-155. Step Questions / actions Yes No
2-112Service Manual 5026 Go Back Previous Next 920.21—POST (power-on self test)—24 V power supply failure error service check Step Questions / actions Yes No 1Note: The LVPS must be turned off for several seconds before turning back on. This error can occur if the LVPS does not have time to recover after being turned off. 1. Open the front door cover 2. Check the 24V interlock switch for damage and proper installation. 3. Check if the front door actuator can trigger the sensor. Is the front door sensor actuator able to trigger the sensor?Go to step 3. Go to step 2. 21. Check if the front door assembly can close properly. 2. Check the front door pivot for any damage. 3. Check if the front door can close properly. Is the front door damaged?Replace the front door. See “Front door assembly removal” on page 4-100.Go to step 3. 31. Check the cable in connector JCVR1 for proper connection to the system board, pinch points, and for any other damage to the cable or connector. 2. Reseat the cable. Did the error clear?Problem resolved. Go to step 4. 41. Disconnect the cable in connector JCVR1 2. Connect a new 24 V interlock switch without properly routing the cables. Note: The 24V interlock switch should be plugged in without installing inside the machine. Close the covers, manually actuate the switch, and then turn on the machine. Did the error clear?Replace the 24 V interlock switch. See “24 V interlock switch removal” on page 4-63.Go to step 5. 5Check the input voltage switch on the back of the low-voltage power supply (LVPS). Some power supplies do not have the switch. Note: If your FRU does not have a switch, proceed to step 6. Is the voltage level (115/230) properly set?Go to step 6. Set the switch for the proper voltage supported by your country. 6Reseat the cable in connector JLVPS1. Did the error clear?Problem resolved. Go to step 7. 7Replace the LVPS. Note: Verify first if the new LVPS is working properly before installing it inside the machine. Remove the old LVPS, and install the new LVPS without installing the screws. Connect the fuser and JLVPS1 connectors to the new LVPS. Did the error clear?Replace the LVPS. See “Low-voltage power supply (LVPS) removal” on page 4-119.Replace the system board. See “System board removal” on page 4-155.
Diagnostic information2-113 5026 Go Back Previous Next 920.23—POST (power-on self test)—Duplex motor 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 JDX1. Does the error clear?Problem resolved. 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. 3Remove the right cover. See “Right cover removal” on page 4-51. Check the MPF/ duplex motor cable in connector JDX1 for pinch points and any other damage to the cable or connector. Check both ends of the cable. Is the cable damaged?Replace the MPF/duplex motor cable. See “Multipurpose feeder (MPF)/duplex motor cable removal” on page 4-128. Note: Make sure to verify if the new cable is working properly first. Route the cables properly only when you have verified that the cables are working properly.Go to step 4. 41. Replace the MPF/duplex motor assembly. See“Multipurpose feeder (MPF)/duplex motor assembly removal” on page 4-125. Note: Before replacing a motor, always verify if the new part is working properly by connecting it outside of the machine, 2. POR the printer and check if the error is gone. Did the error clear?Problem resolved. Replace the system board. See “System board removal” on page 4-155.
2-114Service Manual 5026 Go Back Previous Next 920.27, 920.28, 920.29—POST (power on self test) option tray error service check 920.32—MPF paper present sensor not connected service check 925.01, 925.03, 925.05—Fan error service check Step Questions / actions Yes No 1Is the specified option the 550-sheet tray? Replace the 550-sheet tray with a new 550-sheet tray option.Go to step 2. 2Is the specified option the special media tray? Replace the special media tray with a new special tray option.Go to step 3. 3Is the specified option the high-capacity input tray (HCIT)?Replace the HCIT controller board assembly. See “HCIT controller board assembly removal” on page 4-199. Step Questions / actions Yes No 1Check the cable in connector JMPFPP1 for proper connection, reseat cable. Did the error clear?Problem resolved. Go to step 2. 21. Check the connection on the paper present sensor side. 2. Check for damage and pinch points on the cable. 3. Reseat cable. Did this fix the problem?Problem resolved. Go to step 3. 3Replace the MPF paper present sensor. See “Multipurpose feeder (MPF) paper present sensor” on page 4-129. Note: Before replacing a part, always verify by connecting the part outside of the machine. Did the error clear?Problem resolved. 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. Check the cable in connector JFAN1 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 fan. See “Cooling fan removal” on page 4-85. 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.