Service manual

Service Call Conditions
SM 4-5 M001
Trouble-
shooting
Fusing overheat error – software
543 A
The fusing temperature was detected
higher than 235
o
C for longer than 200
ms.
 Fusing thermistor defective
 Power supply board defective
High temperature detection: Hard
544 A
The thermister detects a high
temperature signal.
 Defective thermister
 Defective fusing unit, PSU,
engine board
Fusing lamp remains on
545 A
The fusing lamp remained on longer
than 12 sec. after the fusing unit
reached optimum temperature and the
main motor switched off.
 Fusing thermistor defective
 Power supply board defective
 Defective connection of the
fusing unit
Unstable fusing temperature
During standby, the fusing temperature
went below 60 °C twice or went above
60 °C three times within 500 ms.
546 A
A 60°C increase in fusing temperature
was detected at five 1-sec. intervals
within 60 sec. before reaching fusing
temperature.
 Fusing thermistor defective
 Power supply board defective
 Defective connection of the
fusing unit
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA