C2255, C2256 (bizhub C750i)

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Trouble typeC2255: Developing motor failure to turn

C2256: Developing motor turning at abnormal timing
RankB
Trouble detection conditionC2255: The control circuit detects motor failure to turn while the motor is turning.

C2256: The control circuit detects motor turning while the motor remains stationary.
Trouble isolation–
Relevant electrical parts-Developing motor (M27)
-CPU board (CPUB)
-Base board (BASEB)

Procedure

  1. Check the connector between M27-BASEB CN19E for proper connection and correct as necessary.
  2. Check the connector of M27 for proper drive coupling and correct as necessary.
  3. Check CPUB for proper installation and correct as necessary.
  4. M27 load check
    • Check code: 50
    • Multi code: 1, 4, 5
    • Control signal: BASEB CN19EB-6 to 10
    • Location of electrical component: 2-C
  5. Replace M27. (Part# AA2JM11000)
  6. Replace CPUB. (Part# ACKNH02P03)
  7. Replace BASEB. (Part# ACKNH02101)

(Link to the Field Service Manual)