C6751 (bizhub C759/C659)

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Trouble typeC6751: CCD 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
-Scanner drive board (SCDB)
-CCD board (CCDB)
-MFP board (MFPB)

 Procedure

  1. Correct the harness connection between CCDB PJ3-MFPB CN9 if faulty.
  2. Correct the harness connection between CCDB PJ5-SCDB CN5 if faulty.
  3. Correct the harness connection between SCDB CN1-DCPU CN005 if faulty.
  4. Check for possible extraneous light and correct as necessary.
  5. Clean the lens, mirrors, CCD surface, and shading sheet if dirty.
  6. Correct reflective mirror of the scanner if faulty, or change scanner mirror.
  7. Replace SCDB. (Part# A796H01A00)
  8. Replace the CCD unit. (Part# A795R71000)
  9. MFPB F3E conduction check
  10. Replace MFPB. (Part# A8JEH02002)

L.3.13.6 (Link to the Field Service Manual)