Xerox 8850 Service Manual

03/2003
3-12
8850/ 510DP
PQ 5, PQ 6
Print Quality
PQ 5 Black Prints PQ 6 Blank Prints / Partial Image
Table 1 Black Prints Symptom / Check
Symptom/ check
The print is totally black with
no image.
Probable Cause Corrective Action
1. Defective Charge Scorotron 1. Clean or replace the
screen/pins (REP 9.8).
2. Charge control circuit/
defective Harness
2. Perform GP 1 Xerographic
HVPS Checkout Procedure.
Table 1 Blank Prints / Partial Image Symptom / Check
Symptom/ check
No image or a partial image is
produced when making a
print.
Probable Cause Corrective Action
1. Developer Housing 1A. Ensure that the Devel-
oper Housing Module drive
gears are engaged and the
developer housing is turning.
1B. Ensure that the gear lock
is released from the Devel-
oper Housing Drive Gear.
2. Bias Transfer Roll (BTR) 2A. Check the BTR Roll and
connections for damage / con-
tamination.
2B. Perform GP 1, Xero-
graphic HVPS Checkout Pro-
cedure.
3. Defective Xerographic
HVPS
3. Perform GP 1, Xero-
graphic HVPS Checkout pro-
cedure.
4. Image Module LEDs inop-
erative
4A. Enter [9-21-5] and check
for correct operation. (Refer
to BSD 6.1 and check for cor-
rect electrical connections to/
from the Receiver PWB and
the LED Image Bar.)
4B. Ensure that all connectors
are seated and voltages are
correct to the LED, 5VDC,
RS422, Signal Harness,
Receiver PWB.
5. No Drum drive / defective
Drum.
5. Refer to BSD 4.3 and
check for correct Drum drive.
Replace the Drum (REP 9.3).

Xerox 8850 Specifications

General

Brand	Xerox
Model	8850
Category	Printer
Language	English