C4091 (bizhub 4750i/4050i)

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Contents

Trouble type	C4091: Engine communication error
Rank	C
Trouble detection condition	Communication with the CTL is interrupted for one min. or longer during a stabilization sequence.
Trouble isolation	–
Relevant electrical parts	-CPU board (CPUB) -Base board (BASEB)

Procedure

1. Reboot the machine.
2. Replace CPUB. (Part# ACT9H01003)
3. Replace BASEB.
   4750i (Part# ACT9H02013)
   4050i (Part# ACT9H02002)

(Link to the Field Service Manual)