Xerox 1235N Service Guide - Page 66

White stripe in direction of paper travel 1. Look for dirt or contamination on the LED heads. Clean them with an alcohol wipe. 2. Do the imaging drum units make good connection to their power terminals? 3. Are the LED heads wiring harnesses undamaged and properly seated? 4. Is +3.8V (red wire) supplied to Pin 3 of each LED head assembly? If yes, replace the LED head assembly. 5. Is +3.8 V supplied to the POWER connector pins 1, 2, 3, 4, 5, 6, 7 and 8 on the junction board or at the 16-pin interconnect near the top cover hinge (under the top shield plate). Inspect the junction board's wiring connectors. If the voltage is not OK, replace the low-voltage power supply. 6. If +32 volts supplied to the POWER connector pins 7, 8, 9 and 10 on the engine controller board? Inspect the wiring harnesses or replace the low-voltage power supply. 7. Is +32V supplied to the HVOLT connector Pin 5 of the engine board. If not replace the engine controller board. Transfer the old engine controller board's EEPROM (lower-right corner of board) to the new engine controller board. 8. Inspect the high-voltage wiring harnesses. 9. Replace the high voltage power supply. 52 Phaser 1235 Network Color Printer