• Code: 50.4
• Display: 50.4 Fuser Error
  50.4000
• Description: The product has experienced a fuser drive circuit error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the fuser heat roller and pressure roller surfaces are not damaged. If the fuser is damaged, replace the fuser. If the error persists, replace the fuser motor. If the error persists, replace the power supply. If the error persists, replace the DC controller. If the error persists, replace the low-voltage power supply.

• Code: 50.7
• Display: 50.7 Fuser Error
  50.7000
• Description: The product has experienced a fuser open error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the J150, J156, and J157 connections on the DC controller are firmly connected. If the error persists, replace the fuser. If the error persists, replace the power supply. If the error persists, replace the DC controller.

• Code: 50.8
• Display: 50.8 Fuser Error
  50.8000
• Description: The product has experienced a low subthermistor fuser error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the thermistor connection in the upper left of the fuser area is firmly connected. If the error persists, replace the fuser. If the error persists, replace the DC controller.

• Code: 50.9
• Display: 50.9 Fuser Error
  50.9000
• Description: The product has experienced a high subthermistor fuser error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the thermistor connection in the upper left of the fuser area is firmly connected. If the error persists, replace the fuser. If the error persists, replace the power supply. If the error persists, replace the DC controller.

• Code: 51.XX
• Display: 51.XX Error
• Description: The product has experienced a laser scanner error. The value for XX indicates the following issues. • XX=20: Black laser scanner error • XX=21: Cyan laser scanner error • XX=22: Magenta laser scanner error • XX=23: Yellow laser scanner error
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the J131 and J132 connections on the DC controller are firmly connected. If the error persists, replace the DC controller. If the error persists, replace the product.

• Code: 52
• Display: 52 Scanner Error
• Description: The product has experienced an internal hardware error.
• Remedy: Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the product to initialize. If the error persists, replace the DC controller. If the error persists, replace the product.

• Code: 54.15
• Display: 54.15 Error
  54.1500
• Description: The product has experienced a yellow toner level sensor error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the cables between the DC controller, print-cartridge tray, and color misregistration sensor are firmly connected. If the error persists, replace the color misregistration sensor. If the error persists, replace the DC controller.

• Code: 54.16
• Display: 54.16 Error
  54.1600
• Description: The product has experienced a magenta toner level sensor error.
• Remedy: 1. Turn off the power by using the power switch, and then wait at least 30 seconds. 2. Turn on the power and wait for the product to initialize. If the error persists, verify that the cables between the DC controller, print-cartridge tray, and color misregistration sensor are firmly connected. If the error persists, replace the color misregistration sensor. If the error persists, replace the DC controller.