Ricoh G188 Service Manual page 312

Service Call Conditions
1.
2.
3.
No. Type
Image transfer belt unit error
The machine detects the encoder sensor error.
443 D
1.
2.
3.
No. Type
452 D Paper transfer unit contact error
The paper transfer unit contact sensor does not detect the movement of
actuator at the sensor while the polygon motor rotates.
G188/G189
Dirty image transfer belt contact sensor
Defective image transfer belt contact motor
Disconnected connector of image transfer belt contact sensor or
motor
Broken harness
Shorted 24 V fuse on the PSU
Defective interlock system
Check the motor operation with SP5804-095. Replace the 24V fuse
on the PSU if ITB contact motor does not operate.
Replace the image transfer belt contact sensor.
Replace the image transfer belt contact motor.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective encoder sensor
Image transfer unit installation error
Defective image transfer unit motor
Check if the image transfer belt unit is correctly set.
Replace the image transfer belt unit motor.
Replace the image transfer belt unit.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Defective paper transfer unit contact sensor
Defective paper transfer unit contact motor
Broken +24V fuse on PSU
Defective IOB
3-16 SM Appendix