Ricoh Aficio MP 1600L2, Field Service Manual

Page: 185 / 264

No.
Definition
Symptom Possible Cause
542 A
Fusing temperature warm-up error (center)
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
543 A
Fusing overheat error (center)
The fusing temperature is over
230
°
C for 1 second (detected by
the thermistor).
• Fusing thermistor defective
• Power supply board defective
544 A
Fusing overheat error (center) 2
The fusing temperature is over
250
°
C for 1 second (detected by
the fusing temperature monitor
circuit).
• Fusing thermistor defective
• Power supply board defective
545 A
Fusing lamp overheat error (center)
After the fusing temperature
reaches the target temperature, the
fusing lamp does not turn off for 12
consecutive seconds.
• Fusing thermistor defective or out of position
• Power supply board defective
546 A
Unstable fusing temperature (center)
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
547 B
Zero cross signal malfunction
Zero cross signals are not detected
within 5 seconds after the main
power switch is turned on, or are
not detected within 1 second after
operation begins.
• Power supply board defective
• BICU defective
Service Call Conditions
183
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