Missing Characters Or Voids In Print - Xerox 1235DT - Phaser Color Solid Ink Printer Service Manual

Missing characters or voids in print

1.
Look for dirt or contamination
on the LED heads. Clean them
with an alcohol wipe.
2. Inspect and clean the imaging
drum unit's power terminals
Ensure the spring-loaded pins
travel smoothly up and down.
3. Is a low-toner condition
occurring?
4.
Replace any imaging drum
units you suspect are defective.
5.
Are the LED heads' ribbon
cables undamaged and
properly seated?
6.
Is +3.8V (red wire) supplied to
Pin 3 of each LED head
assembly? If yes, replace the
LED head assembly.
7. 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.
8. 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.
9.
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.
10.
Inspect the high-voltage wiring harnesses.
11. Replace the high voltage power supply.
Service Guide
55