B245/B276/B277/B268/B269 Service Manual 18-Jan-06
123
No.
Definition
Symptom Possible Cause
after the main power
switch is turned on, or are
not detected within 1
second after operation
begins.
Fusing thermistor open (rear)
551 A
The fusing temperature
detected by the thermistor
is below 71C and is not
corrected after the main
power switch is turned on.
Fusing thermistor defective or out of
position
Power supply board defective
Loose connectors
Fusing temperature warm-up error (rear)
552 A
The fusing temperature
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.
Fusing thermistor defective or out of
position
Fusing lamp open
Power supply board defective
Fusing overheat error (rear)
553 A
The fusing temperature is
over 230C for 1 second
(detected by the
thermistor).
Fusing thermistor defective
Power supply board defective
Fusing lamp overheat error (rear)
555 A
After the fusing
temperature reaches the
target temperature, the
fusing lamp does not turn
off for 20 consecutive
seconds.
Fusing thermistor defective or out of
position
Power supply board defective
556 A Unstable fusing temperature (rear)
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