Ricoh SP 8400DN Field Service Manual page 1288

6.Troubleshooting
SC No. Type
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SC No. Type
SC562- A Pressure Roller Thermistor (Center) Does Not Reload
02
When the pressure roller thermistor (center) does not reach a predetermined temperature for
specified seconds consecutively.
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SC562- C Pressure Roller Thermistor (Center) Does Not Reload (Low Voltage)
05
When the pressure roller thermistor (center) does not reach a predetermined temperature for
specified seconds consecutively.
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SC No. Type
SC563- A Pressure Roller Thermistor (Center) 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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550
Error Name/Error Condition/Major Cause/Solution
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 (center).
Check the power supply voltage and reconnect the cable to the outlet.
Replace the thermostat.
Replace the thermopile.
Replace the BCU.
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 (center).
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