Service Call Conditions
SM 4-15 D017/D018/D019/D020
Trouble-
shooting
0
o
C for 5 sec. at the end
of the hot roller.
Fusing thermistor disconnected or
defective
Power supply not within rated range (15%
or more below rating)
552 A Fusing temperature warm-up error (end)
The fusing temperature did not reach
the standby temperature within 20 sec.
at the center of the hot roller after the
main switch turned on.
Fusing thermistor defective or
out of position
Fusing lamp disconnected
Thermistor defective
Fusing lamp defective
553 A Fusing overheat error 1 (end)
The fusing thermistor detected a fusing
temperature over 230 °C for 5 sec. at
the center of the hot roller.
TRIAC short on PSU (PSU
defective)
BCU board defective
Fusing thermistor defective
554 A Fusing overheat error 2 (end)
A fusing temperature over 250 °C is
detected at the center of the hot roller
by the fusing temperature monitor
circuit in the BCU board.
The power was interrupted for more
than 0.3 sec.
TRIAC short on PSU (PSU
defective)
BCU board defective
Fusing thermistor defective
Power supply voltage unstable
555 A Fusing overheat error 3 (end)
After warmup, the center of the hot
roller attained full operating
temperature and maintained this
temperature for 10 sec. without the hot
Center hot roller thermistor
installed incorrectly,
disconnected.
Center hot roller thermistor
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