Ricoh D025 Service Manual page 568

Troubleshooting Guide
Test pattern check
The skew of M, C, Y is different.
The sub scan lines are shifted.
Shifted lines appear cyclically.
D023/D025
Possible cause/Countermeasure
Defective PCU
Defective laser optics housing unit
Defective IOB
1. Reinstall or replace the PCU.
2. Replace the laser optics housing unit.
3. Replace the IOB.
Defective PCU
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 PCU.
3. Check or replace the drive unit.
5-10 SM Appendix