Xerox 1235/DX Service Guide - Page 69

Color misalignments 1. Test the registration sensor as described in the topic "Switch scan test" on page 63. 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. 56 Phaser 1235 Network Color Printer