Ricoh D0C8, Service Manual

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Troubleshooting for Image Quality Problems
SM 6-145 D0CA/D0C9/D0C8/D0CB
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Test pattern check Possible cause/Countermeasure
the end of the scan line?
• Defective laser optics housing unit
• Defective BiCU (PCB1)
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 (PCB1).
Others
•
Skew correction upper limit error
•
Defective BiCU (PCB1)
•
Defective laser optics housing unit
1.
Replace the BiCU (PCB1).
2.
Perform the color skew adjustment
(Image Adjustment).
3.
Replace the laser optics housing unit.
After Executing SP2-111-001
• Result: "0" in SP2-194-007
• Result: Color registration errors in SP2-194-010, -011, -012, -013
Test pattern check Possible cause/Countermeasure
Low image density on the output
•
Low pattern density
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 (S28) at center
• Deformed center area on the image transfer
belt
• Defective BiCU (PCB1)
1. Replace the ID sensors (S27-S29).
2. Replace the image transfer belt.
3. Replace the BiCU (PCB1).
The main scan registrations of M, C, Y, K are
shifted.
•
Defective laser optics housing unit
•
Defective ID sensors (S27-S29)
•
Defective BiCU (PCB1)
•
Incorrect SP value
1.
Perform the color skew adjustment (Image
Adjustment).
2.
Replace the laser optics housing unit.
3.
Replace the ID sensors (S27-S29).
4.
Replace the BiCU (PCB1).
5.
Adjust the value with SP2-182-004 to -021.