SC No. Type Error Name/Error Condition/Major Cause/Solution
SC543-00 A Thermopile (Center) high temperature detection (software)
Above 240 degrees C detected for 1 sec continuously.
Detection period: 0.1 sec, detection count: 10 times or more.
• Fusing sleeve belt defective
• Paper setting misdetection
• Incorrect paper position in the paper feed tray
• Gear abrasion
• Thermopile failure
• 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. Inspect or replace the gears in the fusing unit or main machine.
6. Replace the thermopile (center).
7. Replace the harness between the fusing unit and the BCU or the PSU
(AC controller board).
8. Replace the BCU.
9. Replace the PSU (AC controller board).
If the problem cannot be solved after performing the above steps,
replace the fusing unit.
6. Troubleshooting
826
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