C6754, C6755 (C4751i)

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ByEric Ditges
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Contents

Trouble typeC6754: CIS clamp adjustment failureC6755: CIS gain adjustment failure
RankB
Trouble detection conditionC6754: After the gain adjustment is performed at the start-up, the CIS clamp adjustment value is too high or too low.C6755: After the gain adjustment is performed at the start-up, the peak value of the output data is lower than a given value.
Trouble isolationScanner
Relevant electrical partsDF 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. Check for possible extraneous light and correct as necessary.
  4. Clean the back side reading glass and the shading sheet if dirty.
  5. Replace the DF CIS module assy.
  6. Replace CPUB.
  7. Replace BASEB.

(Link to the Field Service Manual)