Ricoh SP 8400DN Field Service Manual page 1284

6.Troubleshooting
SC No. Type
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SC No. Type
SC553- A Fusing Thermopile (Edge) High Temperature Detection (software)
00
Above a predetermined temperature detected for specified seconds continuously.
Detection period: 100ms, detection count: 10 times or more.
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SC No. Type
SC554- A Fusing Thermopile (Edge) High Temperature Detection (hardware)
01
In the event of an error
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546
Error Name/Error Condition/Major Cause/Solution
Replace the BCU.
Error Name/Error Condition/Major Cause/Solution
Triac short-circuit
Engine controller defective
Fusing roller temperature sensor (center) defective
Fusing control software defective
Check the fusing unit.
Check that the triac of the AC controller on the PSU does not short-circuit.
Reconnect the following connectors CN115 of BCU, connectors between the fusing
unit and the BCU, connectors connected to the fusing unit
Replace the following harness CN115 of BCU, connectors between the fusing unit and
the BCU, connectors connected to the fusing unit
Replace the BCU board.
Replace the fusing unit.
Error Name/Error Condition/Major Cause/Solution
Triac defective (short-circuit)
Engine controller defective
Fusing roller temperature sensor (center) defective
Fusing control software: out of control
Check the sensor temperature with the following SPs. If the temperature is lower than
250°C, replace the thermopile or thermistor.
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SP1-141-101 (Thermopile (center))
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SP1-141-102 (Thermopile (edge))
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SP1-141-103 (Thermistor (center))
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SP1-141-104 (Thermistor (edge))
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SP1-141-151 (Thermopile (center): 200 msec before the SC is generated)
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SP1-141-152 (Thermopile (edge): 200 msec before the SC is generated)
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SP1-141-153 (Thermistor (center): 200 msec before the SC is generated)
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SP1-141-154 (Thermistor (edge): 200 msec before the SC is generated)
Note: The high temperature state of the fusing unit is detected when the temperature