C4002 (bizhub 950i/850i)

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Contents

Trouble type	C4002: PH board communication error
Rank	C
Trouble detection condition	When the PH relay board (PHRYB) is receiving data, a communication error is detected.
Trouble isolation	–
Relevant electrical parts	– PH relay board (PHRYB) – CPU board (CPUB) – Base board (BASEB)

Procedure

1. Turn OFF the main power switch, unplug and plug the power cord. Plug the power cord, wait for 10 sec. or more, and turn ON the main power switch.
2. Check CPUB for proper installation and correct as necessary.
3. Replace CPUB.
4. Replace BASEB.
5. PHRYB F1 conduction check.
6. Replace PHRYB.

(Link to the Field Service Manual)