Xerox 2135DX - Phaser Color Laser Printer, Service Manual

Page: 68 / 199

Service Guide 55
Color misalignments
1. Test the registration sensor as
described in the topic “Switch
scan test” on page 63. Ensure
the registration sensors are
clean without toner dust on
them. Also test the registration
solenoid, as described in the
topic “Motor and clutch tests”
on page 69, to ensure the
registration shutter operates
smoothly and closes complely,
allowing no toner to fall on the
senors.
2.
Look for any broken gears in
the printer. specifically, inspect
the imaging drum gear
assembly, the paper feeder
assembly and the transfer belt
assembly.
3. Inspect and clean the imaging
drum unit’s power terminals
Ensure the spring-loaded pins
travel smoothly up and down.
4. Replace any imaging drum units you suspect are defective.
5. Are the LED heads’ ribbon cables undamaged and properly seated?
Replace any suspect LED head assembly, if necessary
6.
Inspect the wiring harnesses of the junction board for damage or improper
seating.
7.
Inspect the wiring harnesses of the engine controller board for damage or
improper seating.
8. Replace the engine controller board. Transfer the old engine controller
board’s EEPROM (lower-right corner of board) to the new engine controller
board.