Ricoh D104 Field Service Manual page 650

6. Troubleshooting
Test pattern check
The sub scan registrations of M, C, Y
are shifted by more than ±1.4mm from
the sub scan registration of K.
The main scan registration is shifted by
more than ±0.66 mm, but only at the
central area of the image on the output.
6
The skew for M, C, Y is more than ±
0.75 mm from the main scan
registration of K. – at the end of the scan
line?
Others
After Executing SP2-111-001
• Result: "0" in SP2-194-007
• Result: No color registration errors in SP2-194-010, -011, -012
648
Possible cause/Countermeasure
• No defective component
• Defective image transfer belt
• Defective drive units
• Defective BCU
1. Do SP2-111-003 again.
2. Replace the image transfer belt.
3. Replace the drum motor.
4. Replace the BCU.
• 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.
• Defective PCDU
• Defective laser unit
• Defective BCU
1. Reinstall or replace the PCDU.
2. Replace the laser unit.
3. Replace the BCU.
• Skew correction upper limit error
• Defective BCU
• Defective laser unit
1. Replace the BCU.
2. Replace the laser unit.