No.
Definition
Symptom Possible Cause
551 A
Fusing thermistor open (rear)
The fusing temperature detected by
the thermistor is
below 71°C and is
not corrected after the main power
switch is turned on.
• Fusing thermistor defective or out of position
• Power supply board defective
•
Loose connectors
552 A
Fusing temperature warm-up error (rear)
The fusing temperature rises less
than 7 degrees in 2 seconds, and
this continues 5 times
consecutively.
The fusing temperature is not
detected in 25 or 35 seconds.
• Fusing thermistor defective or out of position
• Fusing lamp open
•
Power supply board defective
553 A
Fusing overheat error (rear)
The fusing temperature is over
230°C for 1 second (detected by
the thermistor).
• Fusing thermistor defective
• Power supply board defective
555 A
Fusing lamp overheat error (rear)
After the fusing temperature
reaches
the
target
temperature, the
fusing lamp does not turn off for 20
consecutive seconds.
• Fusing
thermistor defective or out of position
•
Power supply board defective
556 A
Unstable fusing temperature (rear)
The fusing temperature varies 50°
C or more
within 1 second, and this
occurs 2 consecutive times.
• Thermistor defective or out of position
• Power supply unit defective
559
Jam error detected 3 times in succession
• The exit sensor and the duplex
sensor detect a paper jam 3
times in succession
• This condition can occur
when
SP 1159 1 is set to ‘on’.
The default is ‘off’.
Paper jams can occur for the following reasons.
• Dampness
• Paper curl
•
Incorrect paper setting in the paper tray
• Stripper pawls coming apart
6. Troubleshooting
184
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