Service Call Conditions
SM Appendix 3-17 D017/D018/D019/D020/D084/D085
Appendix:
Service Call
Conditions
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
roller rotating.
Center hot roller thermistor
installed incorrectly,
disconnected.
Center hot roller thermistor
defective
557 B Zero cross waveform signal error
The waveform of the zero cross signal
was detected out of range.
Electrical noise on the power
supply line
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