Ricoh SP 8400DN Field Service Manual page 1290

6.Troubleshooting
SC No. Type
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SC No. Type
SC571- A Pressure Roller Thermistor (End) Disconnection
00
When the pressure roller thermistor (end) detects a predetermined temperature or less for
specified seconds consecutively.
Detection period: 100 ms, detection counts: 10 times or more.
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SC No. Type
SC572-02 A Pressure Roller Thermistor (End) Does Not Reload
When the temperature does not reach 40 degrees Centigrade for 100 seconds consecutively.
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SC No. Type
SC573- A Pressure Roller Thermistor (End) High Temperature Detection (software)
00
When the pressure roller thermistor (end) detects a predetermined temperature or above for
specified second consecutively.
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552
Error Name/Error Condition/Major Cause/Solution
Replace the following harness: CN115 of BCU, connectors between the fusing unit and
the BCU, connectors connected to the fusing unit.
Replace the BCU.
Turn the power off/on.
Error Name/Error Condition/Major Cause/Solution
Harness broken
Connector disconnected
Reconnect the connectors between the fusing unit and the BCU.
Replace the pressure roller thermistor (end).
Replace the harness between the fusing unit and the BCU.
Replace the BCU.
Error Name/Error Condition/Major Cause/Solution
Thermistor dirt
Thermopile deformed or not installed (or mounted) properly
Outside input voltage guarantee
After excess temperature rise prevention unit operation
Remove the jammed paper in the fusing unit.
Check and replace the pressure roller thermistor (end).
Check the power supply voltage and reconnect the cable to the outlet.
Replace the thermostat.
Replace the thermopile.
Replace the BCU.
Error Name/Error Condition/Major Cause/Solution
Triac short-circuit
Engine controller defective