Sc542-01, -03, -04, -06 - Ricoh MP 305 Plus Field Service Manual

6. Troubleshooting
4. Replace the BiCU.

SC542-01, -03, -04, -06

Error Name
SC542-01, -03: Fusing Thermistor (Center) Reload Error
SC542-04, -06: Fusing Thermistor (Center) Reload Error (Low power)
Type
SC542-01, -03: A
SC542-04, -06: D(C)
Symptoms
• SC542-01
The fusing thermistor (center) detected that the temperature remained below 22°C for a
period of 3 secs for 5 consecutive times when the fusing unit motor is not rotating and the
fusing lamp is activated, at power ON or recovery from Energy Save.
Measurement of the temperature gradient starts 2 secs after the fusing lamp is activated when
the temperature is 45°C or higher. If the temperature is lower than 45°C, measurement starts
2 secs after the temperature exceeds 45°C. Temperature gradient detection is cancelled if the
thermistor reaches the reload temperature during measurement.
• SC542-02
The fusing thermistor (center) cannot detect the reload temperature for a period of 36 secs
when the fusing lamp is activated at power ON or recovery from Energy Save.
Possible Causes
• The thermistor is dirty.
• The thermistor is deformed or loose.
• An input voltage other than that guaranteed is used.
• The overheat prevention device is activated.
Troubleshooting Procedures
1. Check the voltage. Reconnect the power plug.
2. Replace the thermistor.
3. Replace the fusing lamp.
4. Replace the BiCU.
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