• Code: 920.16
• Description: POST Error
  Bad printhead NVRAM data.
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the large printhead cable in connector (A). Does the error clear? Problem resolved. Go to step 2.
  2 Check 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”. Go to step 3.
  3 Perform the printhead verification to check whether the printhead replacement fixes the problem. See “Printhead verification”. POR the printer. Did the error clear? Replace the printhead. See “Printhead removal, installation, and adjustment”. Replace the system board. See “System board removal”.

• Code: 920.17
• Description: POST Error
  Output bin cable not connected.
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the bin full sensor cable in connector JBIN1 (A). Does the error clear? Problem resolved. Go to step 2.
  2 Check 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”. Go to step 3.
  3 1. 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 and . and turn on the printer). 4. Select SENSOR TESTS, and press Select( ). 5. Select Other Sensors, and press Select( ). 6. Select Bin Full Test, and press Select( ). 7. 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”. Replace the system board. See “System board removal”.

• Code: 920.18
• Description: POST Error
  Cartridge motor 3 (bottom) is not connected.
• Remedy: 1 Turn the printer off and remove the rear frame cover. See “Rear frame cover removal”. Reseat the cables in connectors JCARTP2 (A) and JCARTS2 (B). Does the error clear? Problem resolved. Go to step 2.
  2 Check the cartridge motor 2/3 cables in connectors JCARTP2 and JCARTS2 for pinch points and any other damage to the cables or the connectors. Are the cables damaged? Replace the cartridge motor 2/3 cable. See “Cartridge motor 2/3 cable removal”. Go to step 3.
  3 Remove the right cover. Check the cartridge motor 2/3 cable for proper connections 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 2/3 cable. See “Cartridge motor 2/3 cable removal”. Go to step 4.
  4 Measure the resistance across the fuse F10 on the system board. Is the fuse blown? Replace the system board. See “System board removal”. Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal”

• Code: 920.19
• Description: POST Error
  Stepper motor not connected.
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the motor driver cable in connector JDVR1 (A). Does the error clear? Problem resolved. Go to step 2.
  Remove the right cover. See “Right cover removal”. Check the motor driver cable in connector JDVR1 on the system board for pinch points or any other damage to the cable or connector. Also check the connector on the motor drive card. Is the cable damaged? Replace the motor driver cable. See “Motor driver cable removal”. Go to step 3.
  3 Measure the resistance across fuses F12 (A) and F13 (B)on the system board. Is either fuse blown? Replace the system board. See “System board removal”. Go to step 4.
  4 Check the transport motor cable for pinch points and any other damage to the cable or connector. Is the cable damaged? Replace the transport motor cable. See “Transport cable removal”. Go to step 5.
  5 Visually inspect the motor driver card. Is the motor driver card damaged? Replace the motor driver card. See “Motor driver card removal”. Go to step 6.
  6 Replace the EP drive assembly. See “Electrophotographic (EP) drive assembly removal”. Problem resolved. Replace the system board. See “System board removal”.

• Code: 920.20
• Description: POST Error
  Incompatible transfer module.
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the transport cable in connector JTPS1 (A). Does the error clear? Problem resolved. Go to step 2.
  2 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 3.
  3 Lower the front access cover. Check the transport cable for pinch points and any other cable damage. Is the cable damaged? Replace the transport cable. See “Transport cable removal”. Go to step 4.
  4 Replace the transfer module. See “Transfer module removal”. Does the error clear? Problem resolved. Replace the system board. See “System board removal”.

• Code: 920.21
• Description: POST Error
  +24 V power supply failure.
• Remedy: 1 Check the input voltage switch on the back of the low-voltage power supply (LVPS). Some LVPS FRU do not have switches and switch automatically. If your does not have a switch, go to step 2. Is the voltage level (115/230) properly set? Go to step 2. Set switch for the proper country voltage.
  2 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the cable in connector JLVPS2 (A). Does the error clear? Problem resolved. Go to step 3.
  3 Check the cable JLVPS2 for pinch points and any other damage to the cable or connector. Is the cable damaged? Replace the low-voltage power supply. See “Lowvoltage power supply (LVPS) removal”. Go to step 4.
  4 Measure the resistance across fuses F5, F6, F7, F9, F10, F12, and F13 on the system board. Are any of the fuses blown?

• Code: 920.22
• Description: POST Error
  Fuser bubble sensor is not connected.
• Remedy: 1 Is the bubble sensor flag damaged? Replace the fuser. See “Fuser removal”. Go to step 2.
  2 Remove the rear frame cover. See “Rear frame cover removal”. Check the fuser DC cable in connector JFUSER1 (A) 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”. Go to step 3.
  3 Place a voltmeter between the fuser DC autoconnect, pin 3 and ground (pin 6). Does the voltage meter read +5 V dc? Go to step 5. Go to step 4.
  5 1. Replace the fuser. 2. Bring the printer up in Diagnostics Menu (turn off the printer, press and hold and . and turn on the printer). 3. Select SENSOR TESTS, and press Select( ). 4. Select Dynamic Sensors, and press Select( ). 5. Select Bubble, and press Select( ). 6. Open the front door. 7. Activate the bubble sensor. Did the bubble sensor change from Open to Closed? Problem resolved. Replace the system board. See “System board removal”.

• Code: 920.23
• Description: POST Error
  Duplex motor is not connected
• Remedy: 1 Turn the printer off, and then remove the rear frame cover. See “Rear frame cover removal”. Reseat the cable in connector JDX1 (A). Does the error clear? Problem resolved. Go to step 2.
  2 Check the MPF/duplex motor cable in connector JDX1 for 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”. Go to step 3.
  3 Measure the resistance across fuse F13 on the system board. Is the fuse blown? Replace the system board. See “System board removal”. Go to step 4.
  4 Replace the MPF/duplex motor assembly. See “Multipurpose feeder (MPF)/duplex motor assembly removal”. Does the error clear? Problem resolved. Replace the system board. See “System board removal”