C6400 Zero-cross signal error
While fuser heater ON/OFF control is
performed, the zero-cross signal is not
input within 3 s.
Defective PWB. Replace the engine PWB or power source
PWB and check for correct operation.
taken from different kyocera copier but it will be the same sounds terminal
check fuser if looks ok main board if that the case may as well get a new copier
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