Troubleshooting Guide
D023/D025 5-10 SM Appendix
Test pattern check Possible cause/Countermeasure
The skew of M, C, Y is different. 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.
The sub scan lines are shifted.
Shifted lines appear cyclically.
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.
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