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C5603 (bizhub C750i)

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Trouble typeC5603: Expansion control board communication error
RankC
Trouble detection conditionCommunication error is detected in expansion control board.
Trouble isolation–
Relevant electrical parts-Expansion control board (EXCB)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Reboot the machine.
  2. Check the connector between EXCB CN1EX-BASEB CN11E for proper connection and correct as necessary.
  3. Check the connector between EXCB CN2EX-BASEB CN12E for proper connection and correct as necessary.
  4. Check CPUB for proper installation and correct as necessary.
  5. Replace EXCB. (Part# AA7NH00500)
  6. Replace CPUB. (Part# ACKNH02P03)
  7. Replace BASEB. (Part# ACKNH02101)

(Link to the Field Service Manual)

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