C6751 (bizhub 650i/550i/450i)

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Trouble typeC6751: CCD clamp/gain adjustment failure
RankB
Trouble detection conditionThe adjustment value is 0 or 255 during a CCD clamp adjustment.The peak value of the output data is 64 or less during a CCD gain adjustment.
Trouble isolationScanner
Relevant electrical parts-LED exposure unit
-CCD unit
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Check the connector between CCDB CN2-BASEB CN6 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 lens, mirrors, CCD surface, and shading sheet if dirty.
  5. Correct reflective mirror of the scanner if faulty, or change scanner mirror. (Part# A0ED271200)
  6. Replace the CCD unit. (Part# AA7NR72500)
  7. Replace CPUB.
    650i/550i (Part# AC74H02P03)
    450i (Part# AC76H02P02)
  8. Replace BASEB. (Part# AC74H02101)

(Link to the Field Service Manual)