Error code C-0121 for Bizhub Press 1250 1250P 1052 Bizhub Pro 951

Code: C-0121
 Classification: Main body: Drive
Paper exit motor (M20) speed abnormality.
The M20EM error detection signal is detected twice in succession within a specified period of time after M20 was turned ON.                                                                                         
Measures to take when alert occurs:                                                               The main body and the option stop immediately.                                               
Estimated abnormal parts: 
  • Paper exit motor (M20).
  • Printer control board (PRCB).

Turn OFF/ON the power switch (SW2) of the main body when releasing an abnormal condition.

 Note: "Please call service" is displayed on the touch panel.   


  1. Check the connector connection and the wiring between PRCB and the motor, and repair it if any abnormality.
  2. Check the I/O drive and the coupling of the gear, and repair/replace it if any abnormality. (Wiring diagram: Main body (3/4): 21-P)
  3. Replace M20
  4. Replace PRCB
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