Problem At Regular Intervals - Ricoh M022 Service Manual

Test pattern check
The sub scan registrations of M, C, Y
are shifted.
The skew of M, C, Y 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).
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Possible cause/Countermeasure
• Defective image transfer belt
• Defective drive units
• Defective ID sensor
• Defective BCU
• Incorrect SP value
1. Replace the image transfer belt.
2. Replace the ID sensor.
3. Replace the drum motor.
4. Replace the BCU.
5. Adjust the value with SP2-182-022 to -039.
• Defective PCDU
• Defective laser optics housing unit
• Defective IPU
1. Reinstall or replace the PCDU.
2. Replace the laser optics housing unit.
3. Replace the IPU.
• Defective PCDU
• Defective drive unit
• Drum phase adjustment error
1. Do SP1-902-001 (Drum phase adjustment); see
Replacement and Adjustment – Drive Unit – Gear Unit for
details.
2. Reinstall or replace the PCDU.
3. Check or replace the drive unit.
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Troubleshooting Guide
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