Ricoh MPC 2800 AT-C2 Field Service Manual page 480

5. Appendix: Troubleshooting Guide
Test pattern check
White image, Abnormal image,
Low density
Normal image, but with color
5
registration errors
After Executing SP2-111-001
• Result: "1" in SP2-194-007
• Result: "5" (Out of adjustable range) in SP2-194-010, -011, -012
Test pattern check
Low image density on the output
The main scan registrations of M, C, Y
are shifted by more than ±1.4 mm from
the main scan registration of K.
124
Possible cause/Countermeasure
• Defective laser optics housing unit shutter
• Defective image processing unit
• Low density of test pattern
• Defective BICU
1. Replace the shutter motor.
2. Replace the high voltage power supply unit.
3. Do the forced process control (SP3-011-001) or supply
some toner (SP3-015-xxx).
4. Replace the BICU.
• Defective ID sensor shutter
• Defective ID sensor
• Defective BICU
1. Replace the ID sensor shutter solenoid.
2. Replace the ID sensor.
3. Replace the BICU.
Possible cause/Countermeasure
• Low pattern density
Do the forced process control (SP3-011-001) or supply some
toner (SP3-015-xxx).
• No defective component
• Defective laser optics housing unit
• Defective BICU
1. Do SP2-111-003 again.
2. Replace the laser optics housing unit.
3. Replace the BICU.