Ricoh D025 Service Manual page 567

Test pattern check
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.
The sub scan registrations of M,
C, Y are shifted.
SM Appendix
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.
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.
5-9
Troubleshooting Guide
D023/D025