• Code: 920.18
• Description: POST Error Cartridge motor 3 (bottom) is not connected.
• Remedy: 1 1. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal”. 3. Reseat the cables in connectors JCARTP2 and JCARTS2. Did the error clear? Problem resolved. Go to step 2. 2 Measure 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”. Go to step 3. 3 1. Remove the right cover. See “Right cover removal”. 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”. Go to step 4. 4 Connect 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”. Go to step 5. 5 Connect 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” Return the old EP drive assembly and the old cartridge motor 2/3 cable, then replace the system board. See “System board removal”.

• Code: 920.19
• Description: POST Error Stepper motor not connected.
• Remedy: 1 1. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal”. 3. Reseat the motor driver cable in connector JDVR1. Did the error clear? Problem resolved. Go to step 2. 2 Measure 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”. Go to step 3. 3 1. 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. Does this clear the error? Problem resolved. Go to step 4. 4 Connect a new motor driver cable from outside of the machine. Note: 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. Does this clear the error? Replace the motor driver cable See “Motor driver cable removal”. Go to step 5. 5 Connect 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”. Go to step 6. 6 Connect 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”. Go to step 7. 7 1. 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”. Replace the system board. See “System board removal”.

• Code: 920.21
• Description: POST Error +24 V power supply failure.
• Remedy: 1 Note: 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. 2 1. 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”. Go to step 3. 3 1. 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. 4 1. 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”. Go to step 5. 5 Check 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. 6 Reseat the cable in connector JLVPS1. Did the error clear? Problem resolved. Go to step 7. 7 Replace 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”. Replace the system board. See “System board removal”.

• Code: 920.22
• Description: POST Error Fuser bubble sensor is not connected.
• Remedy: 1 Is the bubble sensor flag (A) damaged? Replace the fuser. See “Fuser assembly removal”. Go to step 2. 2 1. Remove the rear frame cover. See “Rear frame cover removal”. 2. Check the fuser DC cable in connector JFUSER1 for proper connection to the system board, pinch points, and any other damage to the cable or connector. Is the cable damaged? Replace the fuser DC cable. See “Fuser DC cable removal”. 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 3. 3 Place a voltmeter between fuser DC autoconnect pin 3, and ground (pin 6). Does the meter read +5 V dc? Go to step 5. Go to step 4. 4 Place a voltmeter between the JFUSER1, pin 3 and ground (pin 6). Does the voltage drop to +5 V dc? Replace the system board. See “System board removal”. Go to step 5. 5 1. Replace the fuser. 2. Enter Diagnostics mode (press and hold buttons 3 and 6, turn on the MFP, and release the buttons when the progress bar displays.) 3. Touch SENSOR TESTS. 4. Touch Dynamic Sensors. 5. Touch Bubble. 6. Open the front access door and the top access cover. 7. Activate the bubble sensor flag (A). Did the bubble sensor change from Open to Closed on the touchscreen? Problem resolved. Replace the system board. See “System board removal”.

• Code: 920.23
• Description: POST Error Duplex motor is not connected.
• Remedy: 1 1. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal”. 3. Reseat the cable in connector JDX1. Did the error clear? Problem resolved. Go to step 2. 2 Measure 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”. Go to step 3. 3 1. Remove the right cover. See “Right cover removal”. 2. 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”. 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. 4 1. Replace the MPF/duplex motor assembly. See“Multipurpose feeder (MPF)/duplex motor cable removal”. 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”.

• Code: 920.25
• Description: POST Error Bad temperature and humidity sensor.
• Remedy: 1 Open the front access door. Reseat the transport cable. Did the error clear? Problem resolved. Go to step 2. 2 1. Turn the printer off. 2. Remove the rear frame cover. See “Rear frame cover removal”. 3. Reseat the transport cable in connector JTPS1. Did the error clear? Problem resolved. Go to step 3. 3 Check 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”. Go to step 4. 4 Replace the transport belt assembly. See “Transfer module removal”. Did the error clear? Problem resolved. Go to step 5. 5 Connect a new transport cable to the transfer belt module and the system board from outside of the machine. Did the error clear? Replace the transport cable. See “Transport cable removal”. Replace the system board. See “System board removal”.

• Code: 920.26
• Description: POST Error Top access cover sensor not connected.
• Remedy: 1 Open the top access cover. Is the top cover sensor damaged? Replace the top cover sensor. Go to step 2. 2 1. Turn the printer off. 2. Remove the rear frame cover. See “Rear cover removal”. 3. Check the cable in the connector JFDS1 for proper connection to the system board, pinch points, and the cable or connector for any other damage. Is the cable damaged? Replace the top cover sensor. Go to step 3. 3 1. Disconnect the cable in connector JFDS1. 2. Connect the new top cover sensor. 3. Enter Diagnostics mode (press and hold buttons 3 and 6, turn on the MFP, and release the buttons when the progress bar displays. 4. Touch Sensor Tests. 5. Touch Dynamic Sensors. 6. Touch Top Door. 7. Activate the top cover sensor by pressing the flag as shown. Does the display on the touchscreen change from Open to Closed? Replace the top cover sensor. Replace the system board. See “System board removal”.

• Code: 920.27 ... 920.29
• Description: 920.27 POST Error Option board ID unknown. 920.28 POST Error Option type unknown. 920.29 POST Error Option product ID unknown.
• Remedy: 1 Is the specified option the 550-sheet tray? Replace the 550-sheet tray with a new 550-sheet tray option. Go to step 2. 2 Is the specified option the special media tray? Replace the special media tray with a new special tray option. Go to step 3. 3 Is the specified option the high-capacity input tray (HCIT)? Replace the HCIT controller board assembly. See “HCIT controller board assembly removal”