Ricoh MP C2504 Field Service Manual page 845

6. Troubleshooting
SC No.
SC554-02
SC No.
SC555-01
SC555-05
836
Type Error Name/Error Condition/Major Cause/Solution
A Non-contact Thermistor (Edge) high temperature detection (hardware)
In the event of an error
• Fusing sleeve belt defective
• Paper setting misdetection
• Incorrect paper position in the paper feed tray
• Jammed paper between the thermopile and fusing unit
• Thermopile lens dirt
• Thermopile modification/float
• Pressure roller HP sensor disconnected
• Harness disconnection between the fusing unit and the BCU or the
PSU (AC controller board)
• Triac defective (short-circuit)
• BCU failure
• AC controller board failure
1. Inspect the fusing sleeve belt unit, and replace if damaged.
2. Check the paper settings.
3. Check the paper position in the paper feed tray.
4. Reconnect the connectors (main machine side, BCU side).
5. Remove the jammed paper between the thermopile and fusing unit.
6. Clean or replace the thermopile (edge).
7. Replace the fusing unit.
8. Inspect the pressure roller HP sensor with SP5-803-047.
9. Replace the harness between the fusing unit and the BCU or the PSU
(AC controller board).
10. Replace the BCU.
11. Replace the PSU (AC controller board).
Type Error Name/Error Condition/Major Cause/Solution
A Fusing Edge Lamp Continuously Heat
D Fusing Edge Lamp Continuously Heat (Low Power)