Service Call Conditions
D017/D018/D019/D020 4-14 SM
543 A Fusing overheat error 1 (center)
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
544 A Fusing overheat error 2 (center)
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
545 A Fusing overheat error 3 (center)
After warmup, the center of the hot
roller attained full operating
temperature and maintained this
temperature for 10 sec. without the hot
roller rotating.
Center hot roller thermistor
installed incorrectly,
disconnected.
Center hot roller thermistor
defective
547 B Zero cross signal detection error
Zero cross signals were not
detected within the prescribed
time.
PSU, BCU harness loose or
broken
PSU defective
BCU defective
551 A Fusing thermistor open (end)
The temperature of the
hot roller remained below
Fusing thermistor out of its position
because of incorrect installation
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