• Code: 923
• Description: Upper Fuser Thermistor Open Error
• Remedy: 1 Is connector CN19 on the printer controller board connected properly? Disconnect CN19 and turn the printer on. Go to step 2. Plug the connector in securely. 2 Is error 923 displayed? Power off, and reconnect CN19. Go to step 3. Replace the printer controller board. 3 Power the printer off and short-circuit pins (1 and 2) and (3 and 4) of CN19 and power on. Is error 923 displayed? Replace the fuser. Replace the printer controller board

• Code: 924
• Description: Lower Fuser Thermistor Open Error
• Remedy: 1 Turn off the printer and reinstall the fuser, making sure it clicks into place. Turn on the printer. Did this resolve the problem? Problem solved. Go to step 2. 2 Is connector CN19 on the printer controller board connected properly? Disconnect CN19, and turn the printer on. Go to step 3. Plug the connector in securely. 3 Is error 924 displayed? Turn the printer off, and reconnect CN19. Go to step 4. Replace the printer controller board. 4 Turn off the printer and short-circuit pins 8 and 9 of CN19. Turn on the printer. Is error 924 displayed? Replace the fuser. Replace the printer controller board.

• Code: 925
• Description: HVU Error
• Remedy: 1 Has the high voltage power board (HVU) been removed/replaced? Inspect the secondary card on the high voltage board (HVU) for a broken component (Q906). Replace the high voltage board (HVU) if necessary. Go to step 2. 2 Is connector CN9 on the printer controller board connected properly? Replace the printer controller board. Go to step 3. Plug the connector in securely. 3 Did replacing the printer controller board fix the problem? Problem solved. Replace the high voltage power board (HVU).

• Code: 926 ... 929
• Description: 926(K), 927(C), 928(Y), 929(M) - Toner Sensor Error
• Remedy: 1 Is the toner cartridge the correct type for the printer? Go to step 2. Recommend the customer replace the cartridge with the correct type. 2 Is the toner cartridge encoder wheel dirty? Clean the encoder wheel and toner sensor. Go to step 3. 3 Replace the toner cartridge for the color with the error. Did this fix the problem? Problem solved. Go to step 4. 4 Test the sensors. While actuating the sensor, does the voltage fluctuate between 0 V and +5 V between pins 1 and 4 and 5, 8 and 9, 12, and 13 on CN1 on the printer controller board. Replace the printer controller board. Replace the affected toner sensor.

• Code: 930
• Description: Yellow Printhead Error
• Remedy: 1 Check to ensure that the cables between the LED printhead and the printhead controller board as well as the cables between the printhead controller board and the printer controller board are properly connected. Are they properly connected? Go to step 2. Properly connect the cables. 2 Replace the LED printhead for the affected color. Did this resolve the problem? Problem solved. Replace the printhead controller board, and go to step 3. 3 Did replacement of the printhead controller board resolve the problem? Problem solved. Replace the printer controller board.

• Code: 931
• Description: Magenta Printhead Error
• Remedy: 1 Check to ensure that the cables between the LED printhead and the printhead controller board as well as the cables between the printhead controller board and the printer controller board are properly connected. Are they properly connected? Go to step 2. Properly connect the cables. 2 Replace the LED printhead for the affected color. Did this resolve the problem? Problem solved. Replace the printhead controller board, and go to step 3. 3 Did replacement of the printhead controller board resolve the problem? Problem solved. Replace the printer controller board.

• Code: 932
• Description: Cyan Printhead Error
• Remedy: 1 Check to ensure that the cables between the LED printhead and the printhead controller board as well as the cables between the printhead controller board and the printer controller board are properly connected. Are they properly connected? Go to step 2. Properly connect the cables. 2 Replace the LED printhead for the affected color. Did this resolve the problem? Problem solved. Replace the printhead controller board, and go to step 3. 3 Did replacement of the printhead controller board resolve the problem? Problem solved. Replace the printer controller board.

• Code: 933
• Description: Black Printhead Error
• Remedy: 1 Check to ensure that the cables between the LED printhead and the printhead controller board as well as the cables between the printhead controller board and the printer controller board are properly connected. Are they properly connected? Go to step 2. Properly connect the cables. 2 Replace the LED printhead for the affected color. Did this resolve the problem? Problem solved. Replace the printhead controller board, and go to step 3. 3 Did replacement of the printhead controller board resolve the problem? Problem solved. Replace the printer controller board.