Service Call Tables
SM 7-25 D093/D094
Trouble-
Shooting
547 D Zero-Cross Signal Errors
This error occurs if the machine fails to detect 50/60 Hz on the power supply
line.
Note: The zero-cross signal from the ac power supply generates a trigger
pulse to control the power supply of power. (It automatically detects 50/60
Hz.)
Check that the frequency of the power supply to the machine is correct
PSU defective
MCU defective
551 A Pressure roller center thermistor error 1
During the hot roller temperature control sequence, or while the hot roller
and pressure roller were rotating, the pressure roller center thermistor
measured a value higher than 3.3V 10 consecutive times at 600 ms
intervals.
Pressure roller center thermistor not positioned properly
Pressure roller center thermistor connector loose, broken, defective
Pressure roller center thermistor defective
MCU defective
553 A Pressure roller center thermistor error 2
During the hot roller temperature control sequence, the pressure roller
center thermistor measures a value lower than 0.2V.
Pressure roller center thermistor not positioned properly
Pressure roller center thermistor connector loose, broken, defective
Pressure roller center thermistor defective
MCU defective
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