SM 4-13 G147
Trouble
-shooting
out of position
Thermostat has tripped
PSU defective
BICU defective
Fusing overheat error (software
detection)
543 A
A fusing temperature of over 230°C
(446
o
F) is detected for 5 seconds by
the fusing thermistors at the center or
at either end of the hot roller.
Check harnesses and
connectors of PSU, IOB, BICU
PSU defective
IOB defective
BICU defective
Fusing thermistor defective or
wrong type
Fusing overheat error (hardware
circuit detection)
544 A
The dual monitoring circuitry of the
BICU detected temperature above
250
o
C (482
o
F) and tripped the relay
circuit off.
Check harnesses and
connectors of PSU, IOB, BICU
PSU defective
IOB defective
BICU defective
Fusing thermistor defective or
wrong type
Fusing lamp remains on
545 A
After warm-up the fusing lamp
remained at full power for 10 sec.
(center) and 15 sec. (ends) without
the hot roller rotating.
One or both thermistors out of
position.
Zero cross signal error
547 D
One of the following occurred:
1. The fusing relay remained off for
50 ms after power on and
continued to remain off after the
PSU defective
Noise on the ac power line
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