B245/B276/B277/B268/B269 Service Manual 18-Jan-06
122
No.
Definition
Symptom Possible Cause
rises less than 7 degrees
in 2 seconds, and this
continues 5 times
consecutively.
The fusing temperature is
not detected in 25 or 35
seconds.
position
Fusing lamp open
Power supply board defective
Fusing overheat error (center)
543 A
The fusing temperature is
over 230C for 1 second
(detected by the
thermistor).
Fusing thermistor defective
Power supply board defective
Fusing overheat error (center) 2
544 A
The fusing temperature is
over 250C for 1 second
(detected by the fusing
temperature monitor
circuit).
Fusing thermistor defective
Power supply board defective
Fusing lamp overheat error (center)
545 A
After the fusing
temperature reaches the
target temperature, the
fusing lamp does not turn
off for 12 consecutive
seconds.
Fusing thermistor defective or out of
position
Power supply board defective
Unstable fusing temperature (center)
546 A
The fusing temperature
varies 50C or more within
1 second, and this occurs
2 consecutive times.
Thermistor defective or out of
position
Power supply unit defective
Zero cross signal malfunction
547 B
Zero cross signals are not
detected within 5 seconds
Power supply board defective
BICU defective
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