03/2003
3-19
8850/ 510DP
PQ 18, PQ 19
Print Quality
PQ 18 Spots PQ 19 Uneven Density
Table 1 Spots Symptom / Check
Symptom/ check
Circular black spots on the
print.
Probable Cause Corrective Action
Perform Panic Stop/Image on
Drum procedure (GP 2), and
examine the Drum for the
defect.
1. Defective, damaged or con-
taminated Drum
1A. Wash the Drum (GP 3
Drum Maintenance)
1B. If the Drum is damaged,
determine and fix the cause of
the damage to the Drum.
1C. Replace the Drum (REP
9.3).
Repetitive spots 2. Contaminated Fuser Heat
and/ or Pressure Roll
2. Clean or replace the Heat/
Pressure roll (REP 10.2, REP
10.8).
3. Contaminated fuser ther-
mistor
3. Clean the thermistor (PL
10.4).
Random spots 4. Contaminated Web Oiler 4A. Check/ replace Web Oiler
(REP 10.5).
4B. Check/ adjust oil dis-
pense rate [10-32] (Special
Tests).
5. Defective Photoreceptor
Seal
5. Check / replace (PL 9.3).
6. Charge scorotron 6. Clean or replace the
scorotron (REP 9.8).
Table 1 Uneven Density Symptom / Check
Symptom/ check
Density and line thickness
vary across the print.
Probable Cause Corrective Action
1. Incorrect Corotron opera-
tion
1A. Perform Electrostatic
Series (ADJ 9.2)
1B. Perform GP 1, Xero-
graphic HVPS Checkout Pro-
cedure.
2. Contaminated LED Image
Bar
2A. Check / clean the Image
Bar. .
2B. Check / clean the Pres-
sure Equalizer Tubes (PL 9.9)
2C. Check that the Toner Dust
Trap, Tubes are not plugged.
Replace as required (PL
9.10).
2D. Check/Replace the Toner
Filter (PL 9.10).
3. Machine level 3. Check the level of the
machine. (See Installation
Procedure in Section 6.
4. Contaminated/ damaged
BTR
4. Clean/ replace BTR or
Spacing Rollers (PL 8.3)
5. Developer mag brush not
contacting the Drum evenly.
5A. Clean Drum ends and the
Spacer Rolls on the Devel-
oper Housing (PL 9.10).
5B. Ensure that the housing
is latched securely.
6. Defective Drum 6. Clean or replace the Drum
(REP 9.3).
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