Problem At Regular Intervals - Ricoh Aficio MP C305SP Field Service Manual

Test pattern check
The skew of M, C, Y, K is different.
The sub scan lines are shifted. Shifted
lines appear cyclically.

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
Possible cause/Countermeasure
• Defective PCDU
• Defective laser optics housing unit
• Defective BICU
1. Reinstall or replace the PCDU.
2. Perform the color skew adjustment (
3. Replace the laser optics housing unit.
4. Replace the BICU.
• Defective PCDU
• Defective drive unit
• Drum phase adjustment error
1. Reinstall or replace the PCDU.
2. Check or replace the drive unit.
Troubleshooting Guide
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