Test pattern check Possible cause/Countermeasure
The sub scan registrations of M, C, Y
are shifted.
• Defective image transfer belt
• Defective drive units
• Defective ID sensor
• Defective BICU
• Incorrect SP value
1. Replace the image transfer belt.
2. Replace the ID sensor.
3. Replace the drum motor.
4. Replace the BICU.
5. Adjust the value with SP2-182-022 to -039.
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.
Troubleshooting Guide
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