Ricoh D143 Field Service Manual page 804

6. Troubleshooting
No. Type
491 D
No. Type
492 C
No. Type
497 C
802
Details (Symptom, Possible Cause, Troubleshooting Procedures)
High voltage power: Drum / development bias output error
An error signal is detected for 0.2 seconds when charging the drum or
development.
• High voltage leak
• Broken harness
• Defective drum unit or development unit
• Defective high voltage supply unit
1. Check or replace the harness.
2. Replace the drum unit or paper transfer unit.
3. Replace the high voltage supply unit.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
High voltage power: Image transfer / paper transfer bias output error
An error signal is detected for 0.2 seconds when charging the separation, image
transfer bet or paper transfer roller.
• High voltage leak
• Broken harness
• Defective image transfer belt unit or paper transfer unit
• Defective high voltage supply unit
1. Check or replace the harness.
2. Replace the image transfer belt unit or paper transfer unit.
3. Replace the high voltage supply unit.
Details (Symptom, Possible Cause, Troubleshooting Procedures)
Temperature sensor error
The thermistor output of the temperature sensor was not within the prescribed
range (more than 0.5 V to less than 3.0 V).
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1. Turn the power switch off and on.