01/023-18 8825/8830 PrinterPQ 18, PQ 19Print QualityPQ 18 Spots PQ 19 Uneven DensityTable 1 Spots Symptom / CheckSymptom/ checkCircular black spots on theprint.Probable Cause Corrective ActionPerform Panic Stop/Image onDrum procedure (Section 6),and examine the drum for thedefect.1. Defective, damaged or con-taminated drum1. If the drum is damaged,determine and fix the cause ofthe damage to the drum.Replace the drum ( REP 9.3).Repetitive spots 2. Contaminated heat roll 2. Clean or replace the heatroll ( REP 10.2).Repetitive spots 3. Contaminated fuser ther-mistor3. Clean the thermistor ( PL10.4).Random spots 4. Contaminated Web Oiler 4A. Check / replace ( REP10.9)4B. Check / adjust oil dis-pense rate [10-32].Random spots 5. Defective Lower CleaningSeal5. Check / replace ( PL 9.10).Random spots 6. Charge scorotron 6. Clean or replace thescorotron ( REP 9.8).Table 1 Uneven Density Symptom / CheckSymptom/ checkDensity and line thicknessvary across the print.Probable Cause Corrective Action1. Incorrect Corotron opera-tion1. Perform GP 1, HVPSCheckout Procedure.2. Contaminated LED ImageBar2. Check / clean the ImageBar. Check / clean the AirPressure Tubes ( PL 9.9).3. Machine level 3. Check the level of themachine. (See InstallationProcedure in Section 6.4. Developer mag brush notcontacting the drum evenly.4A. Clean drum ends and theSpacer Rolls on the Devel-oper Housing ( PL 9.10).4B. Ensure that the housingis latched securely.5. Defective drum 5. Clean or replace the drum (REP 9.3).
