C6754, C6755 (bizhub C750i)

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Trouble typeC6754: CIS clamp adjustment failure

C6755: 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 parts-CIS module (CIS)
-CIS power supply (CISPU)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Check the connector between CIS CN2-BASEB CN5 for proper connection and correct as necessary.
  2. Check CPUB for proper installation and correct as necessary.
  3. Correct the harness connection between CIS CN1-CISPU CN2 if faulty.
  4. Check for possible extraneous light and correct as necessary.
  5. Clean the back side reading glass and the shading sheet if dirty.
  6. Replace CIS. (Part# AAMPR70100)
  7. Replace CISPU. (Part# A3CKH00200)
  8. Replace CPUB. (Part# ACKNH02P03)
  9. Replace BASEB. (Part# ACKNH02101)

(Link to the Field Service Manual)