Ricoh D131 Service Manual page 500

Zero cross signal error 2: Unstable power supply
SC547-03 D
After 11 samplings the power supply was not within 50 to 60 Hz,
indicating that the power supply is not stable.
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Fusing thermistor error 1: End thermistor
SC551 A
The end thermistor (contact type) was less than 0C (32F) for more
than 7 seconds.
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Fusing reload temperature error 1: End thermistor
The end thermistor (contact type) could not detect:
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SC552-01 A
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Fusing reload temperature error 2: End thermistor
SC552-02 A
The hot roller did not reach 100
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SM Appendix
Check power source with local supplier
Thermistor connector loose, broken, defective
Thermistor incorrectly installed or loose
100°C 25 seconds after the start of the warm-up cycle.
A change in temperature more than 16 degrees for 5 seconds.
The reload temperature with 56 seconds after the start of the
fusing temperature control cycle.
Fusing lamp disconnected
Thermistor connector loose, broken, defective
Thermistor out of position, installed incorrectly
Thermostat open
Fusing lamp disconnected
Thermistor connector loose, broken, defective
Thermistor out of position, installed incorrectly
Thermostat open
2-33
SC500: Feed, Transport, Duplex, and Fusing
o
C within the prescribed time.
D131/D132/D133