Print Quality Raps; Pq 1 Background; Pq 2 Bands - Xerox 8825 Service Manual

PQ 1 Background

Table 1 Background Symptom / Check
Symptom / check Probable Cause
Contamination of the blank
area by toner particles on the
print
1. An incorrect electrostatic
value
2. Developer Bias incorrect.
3. Toner concentration too
high.
4. Erase Lamp operation.
5. Contaminated
scorotron
6. Defective Cleaner Blade
7. Web Oil system not operat-
ing correctly.
8. Contaminated or defective
drum.
8825/8830 Printer
Corrective Action
1A. Perform Electrostatic
Series ( ADJ 9.2).
1B. Perform GP 1 HVPS
Checkout Procedure.
1C. Clean/Replace/Repair
the corotrons.
2A. Perform GP 1 HVPS
Checkout Procedure.
2B. Ensure that TAG 19 is
installed.
3. Perform Image Density (
ADJ 9.3).
4. Refer to BSD 9.6 and
check for correct operation of
the Erase Lamp.
charge 5, Clean or replace if neces-
sary ( PL 9.3).
6. Replace the Cleaner Blade
( REP 9.4).
7. Refer to BSD 10.2 and
check Web Oil system for cor-
rect operation.
8. Replace the drum ( REP
9.3).
01/02

PQ 2 Bands

Table 1 Bands Symptom / Check
Symptom/ checks Probable Cause
Bands are 1 mm or more wide
and are in the media feed
direction. High density bands
are called black lines.
1.
scorotron
2. Defective Cleaner Blade
3.
roll.
4.
value.
5. Toner cloud from the Devel-
oper Module contaminating
the Drum and corotrons.
6. T/DT Corotron contami-
nated.
7. Contaminated or defective
drum.
8. Image Module LEDs oper-
ating incorrectly.
9. LED Bar without Tag 28
incorrectly connected to Main
PWB.
10. Toner buildup on Mag-
netic Roll.
3-9
Corrective Action
Contaminated charge 1. Clean / replace screen /
pins ( REP 9.8).
2. Replace the Cleaner Blade
( REP 9.4).
Contaminated magnetic 3. Check for foreign objects
on the mag roll.
Incorrect Electrostatic 4A. Ensure that
installed.
4B. Perform Electrostatic
Series ( ADJ
4C. Perform
Checkout Procedure.
4D. Clean / replace / repair
the corotrons.
5A. Ensure that the Air Pres-
sure Tubes are clean (
9.18).
5B. Check for toner buildup on
the lower edge of the Devel-
oper Housing.
6. Check / clean / repair
7. Replace the drum (
9.3).
8. Enter [9-21-5 and check for
correct operation.
BSD 6.1, BSD 6.2
for correct electrical connec-
tions to/from the Receiver
PWB and the LED Image
Bar).
9. Connect to J307A.
10. Go to Technical Services
Bulletin (TSB 98116) for toner
removal procedure.
TAG 19 is
9.2).
GP 1 HVPS
REP
REP
(Refer to
and check
Print Quality
PQ 1, PQ 2