• Code: 932
• Description: Printhead Error
  Printhead: Lost Hsync
• Remedy: 1 Error Code 931 No first HYSNC Signal Error Code 932 Lost HYSNC These errors usually indicate a failure in the HYSNC signal to the printhead. Check the continuity of the cables connected to J3 and J8 on the engine board. If incorrect, replace the defective cable. The voltage at J8-4 measures approximately +5 V dc. If incorrect, replace the engine board. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the printhead assembly. 2 Error Code 934 Mirror Motor Lost Lock Error Code 935 Mirror Motor unable to reach operating speed These error codes indicate a problem with the mirror motor circuit in the printhead assembly or the mirror motor cable to the engine board cable or engine board assembly. Check the continuity of the mirror motor cable connected to J3 on the engine board. If incorrect, replace the cable. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the FRUs in the following order: engine board

• Code: 933
• Description: Printhead Error
  Mirror Motor Locks/Lost Hsync
• Remedy: 1 Error Code 931 No first HYSNC Signal Error Code 932 Lost HYSNC These errors usually indicate a failure in the HYSNC signal to the printhead. Check the continuity of the cables connected to J3 and J8 on the engine board. If incorrect, replace the defective cable. The voltage at J8-4 measures approximately +5 V dc. If incorrect, replace the engine board. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the printhead assembly. 2 Error Code 934 Mirror Motor Lost Lock Error Code 935 Mirror Motor unable to reach operating speed These error codes indicate a problem with the mirror motor circuit in the printhead assembly or the mirror motor cable to the engine board cable or engine board assembly. Check the continuity of the mirror motor cable connected to J3 on the engine board. If incorrect, replace the cable. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the FRUs in the following order: engine board

• Code: 934
• Description: Printhead Error
  Mirror Motor Lost Lock
• Remedy: 1 Error Code 931 No first HYSNC Signal Error Code 932 Lost HYSNC These errors usually indicate a failure in the HYSNC signal to the printhead. Check the continuity of the cables connected to J3 and J8 on the engine board. If incorrect, replace the defective cable. The voltage at J8-4 measures approximately +5 V dc. If incorrect, replace the engine board. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the printhead assembly. 2 Error Code 934 Mirror Motor Lost Lock Error Code 935 Mirror Motor unable to reach operating speed These error codes indicate a problem with the mirror motor circuit in the printhead assembly or the mirror motor cable to the engine board cable or engine board assembly. Check the continuity of the mirror motor cable connected to J3 on the engine board. If incorrect, replace the cable. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the FRUs in the following order: engine board

• Code: 935
• Description: Printhead Error
  Mirror Motor unable to reach operating speed.
• Remedy: 1 Error Code 931 No first HYSNC Signal Error Code 932 Lost HYSNC These errors usually indicate a failure in the HYSNC signal to the printhead. Check the continuity of the cables connected to J3 and J8 on the engine board. If incorrect, replace the defective cable. The voltage at J8-4 measures approximately +5 V dc. If incorrect, replace the engine board. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the printhead assembly. 2 Error Code 934 Mirror Motor Lost Lock Error Code 935 Mirror Motor unable to reach operating speed These error codes indicate a problem with the mirror motor circuit in the printhead assembly or the mirror motor cable to the engine board cable or engine board assembly. Check the continuity of the mirror motor cable connected to J3 on the engine board. If incorrect, replace the cable. The voltage at J3-7 measures approximately +24 V dc. If incorrect, replace the engine board. If correct, replace the FRUs in the following order: engine board

• Code: 936
• Description: Transport Motor
  Main Drive Motor initial lock failure
• Remedy: 1 Main Drive Assembly (Excessive noise or vibration) Remove the controller board and run a Diagnostic Print Test in the continuous mode. Check the main drive assembly for any excessive noise or vibration. Determine if the noise is in the main drive, toner cartridge, fuser or main drive gearbox. Look for any loose or worn parts in the developer drive assembly, main drive gearbox or fuser. Repair as necessary. 2 Main Drive Motor Assembly (Excessive noise, gears ratcheting and so on) A service error code 936 - Transport Motor may be displayed. Check the voltage at J12-6 on the engine board. It measures approximately +5 V dc when the motor is not running and goes to 0 V dc when the motor is running. If incorrect, replace the engine board. If this does not fix the problem, replace the main drive motor. 3 Main Drive Motor Cable Check the continuity of the main drive motor cable. If incorrect, replace the cable. 4 Motor does not turn, no gear error code 936 or User message 201 Paper Jam displays. Check the voltages at J12 on the engine board. Pin number and voltage: J12-1 = +24 V dc J12-4 = +5 V dc (static) 0 V dc (when main drive motor running) J12-5 = + 5 V dc (static) 0 V dc (when main drive motor running) J12-6 = +5 V dc (static) +2.5 V dc (when main drive motor running) J12-7 = +5 V dc (static) 0 V dc (when main drive motor running) J12-8 = +5 V dc (static) +5 V dc (when main drive motor running) J12-11 = + 5 V dc (static) 0 V dc (when main drive motor running) If the voltage is incorrect, replace the FRUs in the following order: main drive motor assembly engine board

• Code: 937
• Description: Transport Motor
  Main Drive Motor lost lock
• Remedy: 1 Main Drive Assembly (Excessive noise or vibration) Remove the controller board and run a Diagnostic Print Test in the continuous mode. Check the main drive assembly for any excessive noise or vibration. Determine if the noise is in the main drive, toner cartridge, fuser or main drive gearbox. Look for any loose or worn parts in the developer drive assembly, main drive gearbox or fuser. Repair as necessary. 2 Main Drive Motor Assembly (Excessive noise, gears ratcheting and so on) A service error code 936 - Transport Motor may be displayed. Check the voltage at J12-6 on the engine board. It measures approximately +5 V dc when the motor is not running and goes to 0 V dc when the motor is running. If incorrect, replace the engine board. If this does not fix the problem, replace the main drive motor. 3 Main Drive Motor Cable Check the continuity of the main drive motor cable. If incorrect, replace the cable. 4 Motor does not turn, no gear error code 936 or User message 201 Paper Jam displays. Check the voltages at J12 on the engine board. Pin number and voltage: J12-1 = +24 V dc J12-4 = +5 V dc (static) 0 V dc (when main drive motor running) J12-5 = + 5 V dc (static) 0 V dc (when main drive motor running) J12-6 = +5 V dc (static) +2.5 V dc (when main drive motor running) J12-7 = +5 V dc (static) 0 V dc (when main drive motor running) J12-8 = +5 V dc (static) +5 V dc (when main drive motor running) J12-11 = + 5 V dc (static) 0 V dc (when main drive motor running) If the voltage is incorrect, replace the FRUs in the following order: main drive motor assembly engine board

• Code: 939
• Description: Controller - Engine Communications Error
• Remedy: The controller board and the engine board cannot communicate with one another. The controller board, engine board or interconnect board is defective. Check each board for correct installation and secure ground. If no problem is found, replace the FRUs in the following order: controller board engine board interconnect board Note: The controller software also can cause a 939 error code. Contact your next level for software support.

• Code: 940
• Description: Service LV Power Supply
• Remedy: The low voltage power supply zero crossover test failed. • Check the LVPS for correct installation. Ensure that the connector on the LVPS assembly is firmly seated with the connector on the interconnect card connector. • This error can be caused by a noisy AC input power source. • Check to make sure the correct LVPS has been installed. • If all the above are correct, replace the LVPS assembly.