Service manual

Service Call Conditions
SM 6-11 M052/M053/M054
Trouble-
shooting
547 D
Zero cross signal detection error
Zero cross signals were not detected within the prescribed time.
 PSU, BICU harness loose or broken
 PSU defective
557 B
Zero cross waveform signal error
The waveform of the zero cross signal was detected out of range.
 Electrical noise on the power supply line
559 A
Consecutive fusing unit paper jams
Three consecutive paper jams occurred in the fusing unit.
The paper jam counter for the fusing unit reaches 3 times. The paper jam
counter clears after the paper feeds correctly.
Note: This SC is issued only if SP1159 is set to "1".
 Remove the paper jam in the fusing unit.
 Make sure that the paper path in the fusing unit is clear.