Ricoh K-C3 Service Manual page 130

B245/B276/B277/B268/B269 Service Manual
No.
Definition
543 A
544 A
545 A
546 A
547 B
551 A
552 A
Symptom
continues 5 times
consecutively.
The fusing temperature is
not detected in 25 or 35
seconds.
Fusing overheat error (center)
The fusing temperature is
over 230C for 1 second
(detected by the
thermistor).
Fusing overheat error (center) 2
The fusing temperature is
over 250C for 1 second
(detected by the fusing
temperature monitor
circuit).
Fusing lamp overheat error (center)
After the fusing
temperature reaches the
target temperature, the
fusing lamp does not turn
off for 12 consecutive
seconds.
Unstable fusing temperature (center)
The fusing temperature
varies 50C or more within
1 second, and this occurs
2 consecutive times.
Zero cross signal malfunction
Zero cross signals are not
detected within 5 seconds
after the main power
switch is turned on, or are
not detected within 1
second after operation
begins.
Fusing thermistor open (rear)
The fusing temperature
detected by the thermistor
is below 71C and is not
corrected after the main
power switch is turned on.
Fusing temperature warm-up error (rear)
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.
Possible Cause
Power supply board defective
Fusing thermistor defective
Power supply board defective
Fusing thermistor defective
Power supply board defective
Fusing thermistor defective or out of
position
Power supply board defective
Thermistor defective or out of
position
Power supply unit defective
Power supply board defective
BICU defective
Fusing thermistor defective or out of
position
Power supply board defective
Loose connectors
Fusing thermistor defective or out of
position
Fusing lamp open
Power supply board defective
18-Jan-06
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