Ricoh G188 Service Manual page 382

Troubleshooting Guide
Test pattern check
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.
The sub scan registrations of M,
C, Y are shifted by more than
±1.4mm 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.
G188/G189
Possible cause/Countermeasure
2. Replace the ID sensor.
3. Replace the BCU.
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 BCU
1. Do SP2-111-003 again.
2. Replace the laser optics housing unit.
3. Replace the BCU.
No defective component
Defective image transfer belt
Defective drive units
Defective BCU
1. Do SP2-111-003 again.
2. Replace the image transfer belt.
3. Replace the drum motor.
4. 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.
5-6 SM Appendix