• Code: U6
• Display: U6-Power Supply Error
• Description: During the printer’s self diagnostics it was detected that the power supply voltage is irregularly high. Turn off the printer, wait 15 seconds, then turn on the printer.
• Remedy: 1. Inspect the front and rear power supply fans. Ensure they is running correctly and are not blocked. The front fan blows into the chassis. The rear fan blows out from the chassis. 2. Turn the printer off and then on. 3. Replace the low-voltage power supply. 4. Replace the engine controller board.

• Code: U7
• Display: U7-Feeder Home Error
• Description: An error has been detected with the home position of the front paper feeder. Turn off the printer, wait 15 seconds, then turn on the printer.
• Remedy: 1. Test the manual bypass feeder home sensor using the test described in “Switch scan test”. Inspect the sensor and its wiring harness. 3. Replace the engine controller board.

• Code: U8
• Display: U8-Controller Fan Error
• Description: An error has been detected with the controller cavity cooling fan. Turn off the printer, wait 15 seconds, then turn on the printer.
• Remedy: 1. Inspect the electrical chassis fan to see if it is running and not blocked. 2. Inspect the fan’s wiring harness. 3. Replace the fan. 4. Replace the engine controller board.

• Code: U9
• Display: U9-Supply Fan Error
• Description: An error has been detected with the power supply cooling fan. Turn off the printer, wait 15 seconds, then turn on the printer.
• Remedy: 1. Inspect the main cooling fan to see if it is running and not blocked. 2. Inspect the fan’s wiring harness. 3. Replace the fan. 4. Replace the engine controller board.

• Code: W1, W2, W3, W4
• Display: Wn-Toner Low [W1-Yellow Toner Low] [W2-Magenta Toner Low] [W3-Cyan Toner Low] [W4-Black Toner Low]
• Description: The level of toner in the toner cartridge is low. The toner cartridge should be replaced soon, as it is near its end of life. Printing can continue until the toner cartridge is empty; however, some degradation of image quality may occur. The message remains until interrupted by other messages or until the toner cartridge is replaced.
• Remedy:

• Code: W11
• Display: W11-Tray 1 Paper Low
• Description: The printer has detected that the paper level in Tray 1 is low. Printing can continue until the tray runs out of paper. Reload the tray as soon as possible to avoid printing interruptions.
• Remedy:

• Code: W12
• Display: W12-Tray 2 Paper Low
• Description: The printer has detected that the paper level in Tray 2 is low. Printing can continue until the tray runs out of paper. Reload the tray as soon as possible to avoid printing interruptions.
• Remedy:

• Code: W13
• Display: W13-Tray 3 Paper Low
• Description: The printer has detected that the paper level in Tray 3 is low. Printing can continue until the tray runs out of paper. Reload the tray as soon as possible to avoid printing interruptions.
• Remedy: