Ricoh MP C307 Field Service Manual page 439

SC4xx: Image Processing
SC4xx: Image Processing
No. Type
SC442-00 D Image transfer belt contact motor error
ITB contact HP sensor cannot detect the sensor feeler condition within a specified time even
when the ITB contact motor rotates.
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No. Type
SC491-00 C High voltage power: Charge/Development bias output error
Incorrect PWM signal is detected 10 times for consecutive 0.02 sec.
Hardware related causes:
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Load related causes:
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Details (Symptom, Possible Cause, Troubleshooting Procedures)
Contact/Release: 5 sec.
Homing: 10 sec.
Sampling interval: 0.01 sec.
Broken harness or defective connectors
Disconnected connector of ITB contact sensor or motor
Defective ITB contact motor
Image transfer belt unit not installed
Set the ITB unit firmly.
Replace the ITB unit.
Clean the ITB contact HP sensor.
Check the harnesses.
Replace the ITB contact HP sensor.
Replace the ITB contact motor.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Contact failure
Loose connector (Controller side)
Grounding, open-circuit in the high voltage route
Arc discharge due to lack of space
Shorted harness (Controller side)
BiCU malfunction (Signal error)
Power pack (Development/Transfer) failure
Short-circuit
Arc discharge due to lack of space
Deteriorated drum (overcurrent)
Condensated drum (overcurrent)
Incorrect gap between drum and charge roller (incorrect PCDU)
PCDU not installed firmly
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