Ricoh G188 Service Manual page 325

No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective PSU
Defective IOB
Defective BCU
Defective fusing control system
1. Replace the PSU.
2. Replace the IOB.
3. Replace the BCU.
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
Zero cross error
The zero cross signal is detected three times even though the
heater relay is off when turning on the main power.
The zero cross signal is not detected for 3 seconds even though
the heater relay is on after turning on the main power or closing the
front door.
The detection error occurs twice or more in the 11 zero cross signal
detections. This error is defined when the detected zero cross
547 D
signal is less than 39.
Defective fusing relay
Defective fusing relay circuit
Shorted +24V fuse on the PSU
Unstable power supply
1. Check the power supply source.
2. Replace the +24V fuse on the PSU.
3. Replace the PSU
No. Type Details (Symptom, Possible Cause, Troubleshooting Procedures)
548 A Fusing unit rotation error
The heating roller rotation sensor does not detect change in the
SM Appendix
Service Call Conditions
3-29 G188/G189