Dark, Stained Background - Xerox 2135DX - Phaser Color Laser Printer Service Manual

Dark, stained background

1. Determine if any of the imaging
drums were exposed to light for
an extended amount of time. If
so, replace any unit which was.
2.
Examine the fuser rollers for
contamination. Replace the
fuser if they are.
3. Ensure the media type is
correctly set.
4.
Are the power supply fans both
running? A heat build-up
under the imaging units can
cause toner to stain the print's
background.
5. Do the imaging drum units
make good connection to their
power terminals?
6.
Are the LED heads wiring
harnesses undamaged and
properly seated?
7. Is +3.8V (red wire) supplied to
Pin 3 of each LED head assembly? If yes, replace the LED head assembly.
8.
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.
9. 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.
10.
Is +32V supplied to the HVOLT connector Pin 5 of the engine board. If not,
replace the engine board. (Transfer the old engine controller board's
EEPROM (lower-right corner of board) to the new engine controller board.)
11. Inspect the high-voltage wiring harnesses.
12. Replace the high voltage power supply.
48 Phaser 2135 Color Printer