Ricoh G188 Service Manual page 383

Test pattern check
The skew for M, C, Y is more
than ± 0.75 mm from the main
scan registration of K. – at the
end of the scan line?
Others
After Executing SP2-111-001
Result: "0" in SP2-194-007
Result: No color registration errors in SP2-194-010, -011, -012
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
Low image density on the output
SM Appendix
Possible cause/Countermeasure
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.
Skew correction upper limit error
Defective BCU
Defective laser optics housing unit
1. Replace the BCU.
2. Replace the laser optics housing unit.
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).
5-7
Troubleshooting Guide
G188/G189