Ricoh G188 Service Manual page 380

Troubleshooting Guide
Test pattern check
After Executing SP2-111-003
Result: "1" in SP2-194-007
One of results: "5" (Out of adjustable range) in SP2-194-010, -011, -012.
Test pattern check
The main scan registrations of M,
C, Y are shifted by more than ±15
mm from the main scan
registration of K.
The sub scan registrations of M,
C, Y are shifted by more than ±20
mm 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.
The skew for M, C, Y is more
than ±0.75 mm from the main
scan registration of K
G188/G189
Possible cause/Countermeasure
1. Replace the ID sensor shutter solenoid.
2. Replace the ID sensor.
3. Replace the BCU.
Possible cause/Countermeasure
Defective laser optics housing unit
Defective BCU
1. Replace the laser optics housing unit.
2. Replace the BCU.
Defective image transfer belt
Defective drive units
Defective BCU
1. Replace the image transfer belt.
2. Replace the drum motor.
3. 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 PCU
Defective laser optics housing unit
Defective BCU
1. Reinstall or replace the PCU.
2. Replace the laser optics housing unit.
3. Replace the BCU.
5-4 SM Appendix