Troubleshooting Guide
504
Test pattern check Possible cause/Countermeasure
3. Replace the BiCU.
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, -013
Test pattern check Possible cause/Countermeasure
The main scan registrations of M, C, Y, K are shifted by more than
±15.
• Defective laser unit
• Defective BiCU
1. Perform the color skew adjustment
(Image Adjustment).
2. Replace the laser unit.
3. Replace the BiCU.
The sub scan registrations of M, C, Y, K are shifted by more than
±20.
• Defective image transfer belt
• Defective drive units
• Defective BiCU
1. Replace the image transfer belt.
2. Replace the drum motor.
3. Replace the BiCU.
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 BiCU
1. Replace the ID sensor.
2. Replace the image transfer belt.
3. Replace the BiCU.
The skew for M, C, Y, K is more than ±0.75 mm.
• Defective PCDU
• Defective laser optics housing unit
• Defective BiCU
1. Perform the color skew adjustment
(Image Adjustment).
2. Reinstall or replace the PCDU.
3. Replace the laser optics housing unit.
4. Replace the BiCU.
Others
• Skew correction upper limit error
• Defective BiCU
• Defective laser optics housing unit
1. Perform the color skew adjustment
(Image Adjustment).
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