C720B (bizhub C750i)

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Trouble typeC720B: 1st transfer pressure clutch failure
RankC
Trouble detection conditionAfter starting the clutch, an error is detected for the malfunction detection signal.
Trouble isolation–
Relevant electrical parts-1st transfer pressure clutch (CL5)
-Expansion control board (EXCB)

Procedure

  1. Check the connector between CL5-relay CN118-EXCB CN14EX for proper connection and correct as necessary.
  2. Check the connector of CL5 for proper drive coupling and correct as necessary.
  3. CL5 conduction check.
    • Control signal: EXCB CN14EX-9 (REM)
    • Location of electrical component: 17 to 18-P
  4. Replace CL5. (Part# A64JM20000)
  5. Replace EXCB. (Part# ACKNH02101)

(Link to the Field Service Manual)