Xerox 1235DT - Phaser Color Solid Ink Printer Service Manual page 42

Printer fault messages
Code Front panel message
U22 Yellow Toner Missing Reseat Toner
U23 Magenta Toner Missing Reseat Toner
U24 Cyan Toner Missing Reseat Toner
U25 Black Toner Missing Reseat Toner
1. Inspect the toner cartridge sensor flag. Ensure to moves properly and is
not broken.
2. Test the sensor using the test described in "Switch scan test" on page 63.
3. Inspect he toner sensor boards wiring harness.
4. Replace the toner sensor board.
5. Replace the engine control board.
U26 Yellow Drum Error U26 Power Off/On
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. Install a new drum unit.
4. Replace the engine controller board.
5. Replace the print unit chassis.
Service message
U22-Yellow Toner Missing
U23-Magenta Toner Missing
U24-Cyan Toner Missing
U25-Black Toner Missing
U26-Yellow Drum Error
U27-Magenta Drum Error
U28-Cyan Drum Error
U29-Black Drum Error
Service Guide 29