Ricoh Aficio MP 1600L2, Field Service Manual

Page: 186 / 264

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
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