Xerox 2135DX - Phaser Color Laser Printer Service Manual page 37

Printer fault messages
Code Front panel message
U0 Engine ROM Error U0, Power Off/On
U1 Engine RAM Error U1, Power Off/On
U2 Engine EPROM Error U2, Power Off/On
U3 Engine EPROM Missing U3, Power Off/On
U4 Engine SRAM Error U4, Power, Off/On
U5 Engine Control Error U5, Power, Off/On
1. Turn the printer off and then on
2. Reset the printer NVRAM using the procedure "Resetting NVRAM" on
page 85.
3. Replace the engine controller board.
U6 Power Supply Error U6, Power Off/On
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.
U7 Feeder Home Error U7, Power Off/On
1. Test the manual bypass feeder home sensor using the test described in
"Switch scan test" on page 63.
2. Inspect the sensor and its wiring harness.
3. Replace the engine controller board.
U8 Controller Fan Error U8, Power Off/On
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.
U9 Supply Fan Error U9, Power Off/On
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.
U10 Roller Position Error U10, Power Off/On
1. Ensure the correct weight and type of paper is loaded in the currently used
tray. Also ensure the paper is loaded correctly in the tray.
2. Clean the pick and registration rollers.
3. Ensure there are no obstructions in the paper path.
4. Test the registration motor and clutch as described in "Motor and clutch
tests" on page 69. Replace the motor or clutch if necessary.
5. Inspect the wiring for the registration clutch and registration motor.
6. Replace the engine controller board.
24 Phaser 2135 Color Printer
Service message
U0-Engine ROM Error
U1-Engine RAM Error
U2-Engine EPROM Error
U3-Engine EPROM Missing
U4-Engine SRAM Error
U5-Engine Control Error
U6-Power Supply Error
U7-Feeder Home Error
U8-Controller Fan Error
U9-Supply Fan Error
U10-Roller Position Error