C7624 (bizhub C750i)

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Trouble typeC7624: Power line B4 error
RankC
Trouble detection conditionThe fuse detection unit detected an error for a predetermined time.
Trouble isolation–
Relevant electrical parts-Envelope detection relay board (ENVDRB)
-Expansion control board (EXCB)

Procedure

  1. EXCB ICP5 conduction check
  2. Check the connector between ENVDRB CN2-relay CN253-relay CN254-EXCB CN6EX for proper connection and correct as necessary.
  3. Replace ENVDRB. (Part# AA7NH00V00)
  4. Replace EXCB. (Part# AA7NH00500)

(Link to the Field Service Manual)