Troubleshooting Guide
D037/D038/D040/D041 6-4 SM Appendix
Test pattern check Possible cause/Countermeasure
3. Replace the BCU.
Normal image, but with color
registration errors
 Defective ID sensors
 Defective BCU
1. Replace the ID sensor.
2. Replace the BCU.
After Executing SP2-111-003
 Result: "1" in SP2-194-007
 One of results: "5" (Out of adjustable range) in SP2-194-010, -011, -012.
Test pattern check Possible cause/Countermeasure
The main scan registrations of M,
C, Y are shifted by more than ±15
mm from the main scan
registration of K.
 Defective laser unit
 Defective BCU
1. Replace the laser unit.
2. Replace the BCU.
The sub scan registrations of M,
C, Y are shifted by more than ±20
mm from the sub scan
registration of K.
 Defective image transfer belt
 Defective drive units
 Defective BCU
1. Replace the image transfer belt.
2. Replace the drum motor.
3. Replace the BCU.
The main scan registration is
shifted by more than ±0.66 mm,
but only at the central area of the
image on the output.
 Defective ID sensor at center
 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 skew for M, C, Y is more
than ±0.75 mm from the main
scan registration of K
 Defective PCU
 Defective laser unit
 Defective BCU
1. Reinstall or replace the BCU.
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