Troubleshooting Guide
508
Test pattern check Possible cause/Countermeasure
• Drum phase adjustment error
1. Reinstall or replace the PCDU.
2. Check or replace the drive unit.
Problem at Regular Intervals
Image problems may appear at regular intervals that depend on the circumference of certain components.
The following diagram shows the possible symptoms (black or white dots at regular intervals).
[A]: Paper feed direction
[B]: Problems at regular intervals
• Abnormal image at 33.6-mm intervals: Charge roller
• Colored spots at 40.82-mm intervals: Image transfer roller
• Colored spots at 20.9-mm intervals: Development roller
• Abnormal image at 55.4 (center) or 55.0 (end)-mm intervals: Paper transfer roller
• Colored spots at 75.4-mm intervals: OPC drum
• Spots at 78.5-mm intervals: Pressure roller
• Spots at 78.5-mm intervals: Fusing belt
Blank Print
Symptom Possible cause Necessary actions
No image is printed. Defective laser unit Replace the laser unit.
Defective PCDU Replace the PCDU.
Defective image transfer belt unit Replace the image transfer belt unit.
Incorrect action of paper transfer roller Check the guide and the paper transfer roller.
Defective HVPS Replace HVPS.
Defective BiCU Replace the BiCU.
All-Black Print
Symptom Possible cause Necessary actions
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