C9401, C9402 (bizhub 4750i/4050i)

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Contents

Trouble type	C9401: CIS LED lighting failure (front side) C9402: CIS LED lighting abnormally (front side)
Rank	B
Trouble detection condition	C9401: At the CIS gain adjustment, the machine detected that the output of the CIS LED is lower than the specified value. C9402: The average output value of the CIS LED with the scanner at its standby position is a predetermined value or more at the end of a scan job.
Trouble isolation	Scanner
Relevant electrical parts	-Flat cable -CIS module (IR CIS) -CPU board (CPUB) -Base board (BASEB)

Procedure

1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
2. Check CPUB for proper installation and correct as necessary.
3. Replace the flat cable.
4. Replace IR CIS. (Part# AAJNR71200)
5. Replace CPUB. (Part# ACT9H01003)
6. Replace BASEB.
   4750i (Part# ACT9H02013)
   4050i (Part# ACT9H02002)

(Link to the Field Service Manual)