• Code: 41.5
• Display: 41.5 UNEXPECTED TYPE IN TRAY X
• Description: The printer senses a different media type from what is configured in the tray.
• Remedy: 1. Press OK to print from a different tray. 2. To print from the current tray, load the tray with the size and type indicated. Ensure that all trays are configured correctly before printing again.

• Code: 49
• Display: 49.XXXXX ERROR
• Description: A critical firmware error has occurred.
• Remedy: 1. Turn the printer off and then on. 2. Try printing a job from a different program. If the job prints, try printing a different file from the original program. If the message appears only with a certain program or print job, contact the software vendor for assistance. 3. If the message persists with different programs and print jobs, disconnect all of the printer cables that connect to the network or the computer. 4. Turn the printer off. 5. Remove all memory DIMMs or thirdparty DIMMs from the printer. (Do not remove the firmware DIMM in the lower slot J1). 6. Remove the printer EIO card. 7. Turn the printer on. 8. If the error does not persist, install each DIMM and EIO device one at a time. Turn the printer off and then on again after installing each device. 9. Replace DIMMs and EIO devices as necessary. 10. Reconnect all of the printer cables. 11. If the error persists, replace the firmware DIMM. 12. Replace the formatter and calibrate the printer.

• Code: 50.1
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  Low fuser temperature
• Remedy: 1. Verify the fuser is installed correctly and fully seated. 2. Check that connector J6007 on the fuser is seated correctly. Replace the connector as necessary. 3. Turn off the printer. 4. Remove the fuser. 5. If there is no conduction in the main thermistor, measure the resistance between fuser connectors J6007LA-1 and J6007LA-3. If the resistance is not 368 to 522 kohms, replace the fuser. 6. If there is no conduction in the fuser heater, measure the resistance between fuser connectors J6007LAF-1 and J6007-2. If the resistance is not 11.5 to 13.3 kohms (100 to 127 V) or 46.2 to 53.2 kohms (220 to 240 V), replace the fuser. 7. Replace the DC controller PCA.

• Code: 50.2
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  Fuser-warmup service
• Remedy: 1. Verify the fuser is installed correctly and fully seated. 2. Check that connector J6007 on the fuser is seated correctly. Replace the connector as necessary. 3. Turn off the printer. 4. Remove the fuser. 5. If there is no conduction in the subthermistor, measure the resistance between fuser connectors J6007LA-2 and J6007LA-3. If the resistance is not 368 to 522 kohms, replace the fuser. 6. If there is no conduction in the fuser heater, measure the resistance between fuser connectors J6007LAF-1 and J6007-2. If the resistance is not 11.5 to 13.3 kohms (100 to 127 V) or 46.2 to 53.2 kohms (220 to 240 V), replace the fuser. 7. Replace the DC controller PCA.

• Code: 50.3
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  High fuser temperature
• Remedy: 1. Verify the fuser is installed correctly and fully seated. 2. Check that connector J6007 on the fuser is seated correctly. Replace the connector as necessary. 3. Turn off the printer. 4. Remove the fuser. 5. Measure the resistance between fuser connectors J6007LA-1 and J6007LA-3. If the resistance is not 368 to 522 kohms, replace the fuser. 6. Replace the DC controller PCA.

• Code: 50.4
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  Faulty fuser
• Remedy: 1. Improve the power supply if the power supply frequency is not 40 to 70 Hz. 2. Replace the low-voltage power-supply PCA. 3. Replace the DC controller PCA.

• Code: 50.7
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  Fuser pressure release mechanism failure
• Remedy: 1. Verify the fuser is installed correctly and fully seated. 2. Check that fuser connector J705, fuser motor connector J5008, and driver PCA connector J213 are seated correctly. 3. Replace the fuser drive assembly. 4. Replace the DC controller PCA.

• Code: 50.8
• Display: 50.X FUSER ERROR
• Description: A fuser error has occurred.
  Low fuser temperature (subthermistor)
• Remedy: 1. Verify the fuser is installed correctly and fully seated. 2. Check that connector J6007 on the fuser is seated correctly. Replace the connector as necessary. 3. Turn off the printer. 4. Remove the fuser. 5. If there is no conduction in the subthermistor, measure the resistance between fuser connectors J6007LA-1 and J6007LA-3. If the resistance is not 368 to 522 kohms, replace the fuser. 6. If there is no conduction in the fuser heater, measure the resistance between fuser connectors J6007LAF-1 and J6007-2. If the resistance is not 11.5 to 13.3 kohms (100 to 127 V) or 46.2 to 53.2 kohms (220 to 240 V), replace the fuser. 7. Replace the DC controller PCA.