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Test pattern check Possible cause/Countermeasure
The sub scan registrations of M,
C, Y, K 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, K is
different.
 Defective PCDU
 Defective laser optics housing unit
 Defective BICU
1. Reinstall or replace the PCDU.
2. Perform the color skew adjustment (
p.4-3).
3. Replace the laser optics housing unit.
4. Replace the BICU.
The sub scan lines are shifted.
Shifted lines appear cyclically.
 Defective PCDU
 Defective drive unit
 Drum phase adjustment error
1. Reinstall or replace the PCDU.
2. Check or replace the drive unit.
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