Troubleshooting Guide
507
Test pattern check Possible cause/Countermeasure
Do the forced process control (SP3-011-001) or supply
some toner (SP3-030-xxx).
The main scan registration is shifted, 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 main scan registrations of M, C, Y, K are shifted.
• Defective laser optics housing unit
• Defective ID sensor
• Defective BiCU
• Incorrect SP value
1. Perform the color skew adjustment (Image
Adjustment).
2. Replace the laser optics housing unit.
3. Replace the ID sensor.
4. Replace the BiCU.
5. Adjust the value with SP2-182-004 to -021.
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 (Image
Adjustment).
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
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