Xerox 8850 Service Manual

03/2003
3-16
8850/ 510DP
PQ 13, PQ 14
Print Quality
PQ 13 Light Image PQ 14 Misregistration
Table 1 Light Image Symptom / Check
Symptom/ check
Image area of a print has low
density.
Probable Cause Corrective Action
1. Damp media 1A. Refer to BSD 7.1 and
BSD 7.3 to check for correct
operation of the Paper heat-
ers.
1B. Ensure that the Customer
is storing the media correctly.
2. Incorrect Image Module
LED duty cycle
2. Perform Electrostatic
Series (ADJ 9.2).
3. Incorrect Corotron opera-
tion
3A. Perform Electrostatic
Series (ADJ 9.2)
3B. Perform GP 1, Xero-
graphic HVPS Checkout Pro-
cedure.
4. Incorrect Image Density
adjustment
4A. Perform Electrostatic
Series (ADJ 9.2).
4B. Perform Image Density
(ADJ 9.3).
5. Contaminated BTR, dam-
aged drive gears or poor elec-
trical connection
5. Check/ clean/ repair BTR
Slip Ring connection.
Check/ replace drive gears
(PL).
Clean/ replace BTR (REP
9.22),
6. Defective Drum ground. 6. Ensure that the Drum is
correctly grounded.
7. Defective Drum. 7. Replace the Drum (REP
9.3).
8. Developer Housing 8. Ensure the housing is
latched securely.
Table 1 Misregistration Symptom / Check
Symptom/ check
The registration of the image
on the prints is incorrect from
top to bottom or side to side.
Probable Cause Corrective Action
1. Incorrect registration
adjustment
1. Adjust Lead Edge Registra-
tion (ADJ 8.2).
2. Damaged or worn compo-
nents in the media feeding
area
2. Check the components for
damage or wear.
3. Defective Media Registra-
tion Sensor
3. Refer to BSD 8.1 and
check the operation of the
Media Registration Sensor.
Replace the sensor if required
(REP 8.8).
4. Incorrect Registration
Pinch Roll nip
4. Clean or replace the Regis-
tration Pinch Roll (PL 8.2).
5. Incorrectly loaded media 5. Instruct the operator on
loading the media correctly.

Xerox 8850 Specifications

General

Brand	Xerox
Model	8850
Category	Printer
Language	English