Xerox 7300B - Phaser Color Laser Printer Service Manual page 106

Troubleshooting Procedure (cont'd.)
Step Question or Action
7 Swap the Imaging Unit of the problem color
with any other Imaging Unit.
Note: Remove the keys before swapping.
Print a Solid Fill Test Pattern to check for
defects.
Has the problem color moved with the Imaging
Unit?
8 Remove the Imaging Units and the Transfer
Unit and check for toner contamination on the
high voltage contacts.
Is there contamination on the contacts?
9 Are the wiring harnesses on the LED heads
undamaged, properly routed and seated?
10 Is +5V supplied to Pin 1 of each LED Head
assembly?
KPOW2
YPOW2
MPOW2
CPOW2
11 Is +5V supplied to the POWER connector pins
1, 2, 3, 4, 5, 6, 7 and 8 on the Toner Sensor
Board wiring harness or at the 16-pin
interconnect?
12 Is +34V supplied to the POWER connector pins
12, 13, and 14 on the Engine Controller Board?
13 Is +34V supplied to the HVOLT connector Pin 2
on the Engine Controller Board?
14 Inspect the high-voltage wiring harnesses.
Are the wiring harnesses defective?
3-90
Yes
Replace the
Imaging Unit.
Clean the
contacts.
Go to step [10].
Go to step [12].
Replace the
Toner Sensor
Board.
Go to step [13].
Go to step [14].
Replace any
defective wiring
harnesses.
Phaser 7300 Color Printer Service Manual
No
Go to step [8].
Go to step [9].
Replace or
reseat the wiring
harness.
Go to step [11].
Replace the
LVPS.
Replace the
LVPS or wiring
harness.
Replace the
Engine Control
Board.
Replace the
Transfer Unit.
Replace the
HVPS.