Remedy: 1 Is CN17 on the printer controller board properly connected? Go to step 2. Connect CN17. 2 Is CN6 on the CK2 daughter board properly connected? Go to step 3. Connect CN6. 3 Is +24 V present between pins 1 and 3 of connector CN6 on the CK2 daughter board? Replace the power supply fan. Replace the printer controller board. 4 Did either exchange solve the problem? Problem solved. Replace the CK2 daughter board.
Code: 920
Description: Fuser Error–Fuser Heater Trouble
Remedy: 1 Replace the fuser. Did this fix the problem? Problem solved. Return the fuser, replace the power supply 2, and go to step 2. 2 Did replacing power supply 2 fix the problem? Problem solved. Return power supply 2, and replace the printer controller board
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).
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.