Ricoh S-C4.5 Field Service Manual page 159

No.
Definition
Fusing overheat error 1
The fusing temperature detected by the
543 A
thermistor is 230°C or higher for one
second.
Fusing overheat error 2
The fusing temperature detected by the
544 A
monitor circuit is 250°C or higher for one
second.
Fusing lamp overheat error
After the fusing temperature reaches the
545 A
target, the fusing lamp remains on for 12
seconds.
Unstable fusing temperature
While the fusing lamp is on, the fusing
546 A
temperature varies 50°C or more within
one second; and this occurs two
consecutive times.
Zero cross signal malfunction
The zero cross signal is not detected within
five seconds after the main power switch
547 B
is turned on. Or, the zero cross signal is
not detected within one second after
operation begins.
Consecutive fusing jam
The paper jam counter for the fusing unit
reaches 3 times. The paper jam counter is
559 A
cleared if the paper is fed correctly.
This SC is activated only when
SP1159-001 is set to "1" (default "0").
Symptom Possible Cause
• Defective thermistor
• Defective power supply unit
• Defective thermistor
• Defective power supply unit
• Defective thermistor
• Incorrect installation of the thermistor
• Defective power supply unit
• Defective thermistor
• Incorrect installation of the thermistor
• Defective power supply unit
• Defective power supply unit
• Defective BICU
• Paper jam in the fusing unit.
SC Tables
6
157