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C6902, C6903, C6912, C6913 (bizhub 4750i/4050i)

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Trouble typeC6902: Bus check NG1-1

C6903: Bus check NG1-2

C6912: Bus check NG2-1

C6913: Bus check NG2-2
RankC
Trouble detection conditionC6902, C6903: When bus check (front side) detects an error.

C6912, C6913: When bus check (back side) detects an error.
Trouble isolation–
Relevant electrical parts-CIS module (IR CIS)
-DF CIS module (DF CIS)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Check the connector between IR CIS-BASEB CN6 for proper connection and correct as necessary.
  2. Check the connector between DFCISRYB CN2-BASEB CN5 for proper connection and correct as necessary.
  3. Check CPUB for proper installation and correct as necessary.
  4. Replace CPUB. (Part# ACT9H01003)
  5. Replace BASEB.
    4750i (Part# ACT9H02013)
    4050i (Part# ACT9H02002)

(Link to the Field Service Manual)

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