Ricoh MPC 2800 AT-C2 Field Service Manual page 482

5. Appendix: Troubleshooting Guide
Test pattern check
The main scan registration of K is
shifted.
The main scan length of K is shifted.
After Executing SP2-111-001
• Result: "0" in SP2-194-007
• Result: Color registration errors in SP2-194-010, -011, -012
Test pattern check
5
Low image density on the output
The main scan registration is shifted, but
only at the central area of the image on
the output.
The main scan registrations of M, C, Y
are shifted.
126
Possible cause/Countermeasure
• Abnormal SP setting value of main scan: K
Adjust the value with SP2-101-001.
• Abnormal SP setting value of main scan length detection:
K
Adjust the value with SP2-185-001.
Possible cause/Countermeasure
• Low pattern density
Do the forced process control (SP3-011-001) or supply some
toner (SP3-015-xxx).
• 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.
• Defective laser optics housing unit
• Defective ID sensor
• Defective BICU
• Incorrect SP value
1. Replace the laser optics housing unit.
2. Replace the ID sensor.
3. Replace the BICU.
4. Adjust the value with SP2-182-004 to -021.