Just before reaching warm-up temperature,
the fusing temperature did not rise above
80
o
C within 15.5 sec. after the power relay
switched on.
• Fusing thermostat open
• Power supply board Defective
• Defective connection of the fusing
unit
543 A
Fusing overheat error – software
• Fusing thermistor defective
• Power supply board defective
The fusing temperature was detected higher
than 235
o
C for longer than 200 ms.
544 A
High temperature detection: Hard
• Defective thermister
• Defective fusing unit, PSU, engine
board
The thermister detects a high temperature
signal.
545 A
Fusing lamp remains on
• Fusing thermistor defective
• Power supply board defective
• Defective connection of the fusing
unit
The fusing lamp remained on longer than 12
sec. after the fusing unit reached optimum
temperature and the main motor switched off.
546 A
Unstable fusing temperature
• Fusing thermistor defective
• Power supply board defective
• Defective connection of the fusing
unit
During standby, the fusing temperature went
below 60 °C twice or went above 60 °C three
times within 500 ms.
A 60°C increase in fusing temperature was
detected at five 1-sec. intervals within 60 sec.
before reaching fusing temperature.
547 B
Zero cross signal error
• Power supply board defective
• Defective mains power supply
condition
Zero cross signals of wavelength 50-60 Hz
were not detected within 5 sec after the fusing
relay switched on.
-or-
Zero cross interrupts did not issue at the
prescribed 3 sec. intervals.
4. Troubleshooting
58
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