Troubleshooting Guide
D037/D038/D040/D041 6-8 SM Appendix
Test pattern check Possible cause/Countermeasure
shifted, but only at the central
area of the image on the output.
Deformed center area on the image transfer belt
Defective BCU
1. Replace the ID sensor.
2. Replace the image transfer belt.
3. Replace the BCU.
The main scan registrations of M,
C, Y are shifted.
Defective laser optics housing unit
Defective ID sensor
Defective BCU
Incorrect SP value
1. Replace the laser optics housing unit.
2. Replace the ID sensor.
3. Replace the BCU.
4. Adjust the value with SP2-182-004 to -021.
The sub scan registrations of M,
C, Y are shifted.
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.
The skew of M, C, Y is different. Defective PCDU
Defective laser optics housing unit
Defective BCU
1. Reinstall or replace the PCDU.
2. Replace the laser optics housing unit.
3. Replace the BCU.
The sub scan lines are shifted.
Shifted lines appear cyclically.
Defective PCDU
Defective drive unit
Drum phase adjustment error
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