Xerox 2135N - Phaser Color Laser Printer Quick Reference Manual page 39

Printer fault messages
Code Front panel message
U27 Magenta Drum Error U27, Power Off/On
U28 Cyan Drum Error U28, Power Off/On
U29 Black Drum Error U29 Power Off/On
1. Remove and install the drum unit.
2. Inspect the spring-loaded drum unit contacts (in a set of three). Ensure
they are clean and move up and down freely. Remove the assembly and
reseat it, if necessary.
3. Test the drum unit contacts using the Drum contact switch test listed in
"Switch scan test" on page 63.
4. Install a new drum unit.
5. Replace the engine controller board.
6. Replace the print unit chassis.
W16 Fuse Cut Error
For the new Customer Replaceable
Consumable (imaging drums, transfer belt or
fuser) just installed, the printer did not detect
the CRC's "new/used" fuse blow. An internal
fuse of a new CRC ordinarily blows a few
seconds after the CRC is installed. If the fuse
cannot be blown, then the consumable's
counter can't be reset and the "consumable
expired / replace" messages will not go away.
1. Remove the CRC.
2. Cycle the printer's power.
3. Install the CRC again. If the error still
occurs, try a different CRC.
4. If error reoccurs with a different CRC,
replace the engine controller board.
5. Replace the print unit chassis.
26 Phaser 2135 Color Printer
Service message
U27-Magenta Drum Error
U28-Cyan Drum Error
U29-Black Drum Error
W16 - Fuse Cut Error