Ricoh SP 8400DN Field Service Manual page 1285

SC No. Type
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SC No. Type
SC554- A NC Sensor (End) High Temperature Detection (hardware)
02
In the event of an error
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Error Name/Error Condition/Major Cause/Solution
detected by the sensor is 250°C or more. Therefore, if the temperature of the above SPs
is lower than 250°C, the thermopile or thermistor may be defective or out of position.
Check the fusing unit.
Check that the triac of the AC controller on the PSU does not short-circuit.
Replace the PSU.
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.
Turn the power off/on.
Error Name/Error Condition/Major Cause/Solution
Triac defective (short-circuit)
Engine controller defective
Fusing roller temperature sensor defective (rear)
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
detected by the sensor is 250°C or more. Therefore, if the temperature of the above SPs
is lower than 250°C, the thermopile or thermistor may be defective or out of position.
Check the fusing unit.
Check that the triac of the AC controller on the PSU does not short-circuit.
Replace the PSU.
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
6.Troubleshooting
547