C9403, C9404 (C4751i)

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ByEric Ditges
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Contents

Trouble typeC9403: CIS LED lighting failure (back side)C9404: CIS LED lighting abnormally (back side)
RankB
Trouble detection conditionC9403: At the CIS gain adjustment, the machine detected that the output of the CIS LED is lower than the specified value.C9404: After a scan job is completed, the machine detected that the average output of the CIS LED is greater than the specified value.
Trouble isolationScanner
Relevant electrical partsFlat cableDF CIS module (DF CIS)CPU board (CPUB)Base board (BASEB)

Procedure

  1. Check the connector between DF CIS-BASEB CN5 for proper connection and correct as necessary.
  2. Check CPUB for proper installation and correct as necessary.
  3. Replace the flat cable.
  4. Replace the DF CIS module assy.
  5. Replace CPUB.
  6. Replace BASEB.

(Link to the Field Service Manual)