Error code C-0021 for Bizhub Press 1250 1250P 1052 Bizhub Pro 951

Code: C-0021


Classification: Main body: Communication error
 Cause: ADU drive serial input abnormality 2. In the initial communication check between the printer control board (PRCB) and the ADU drive board (ADUDB) after the power ON, a serial data is not received. 

 Measures to take when alert occurs:                                                               The main body and the option stop immediately                

Estimated abnormal parts:  

  • Printer control board (PRCB) 
  • ADU drive board (ADUDB)

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

 Note: The message "Please turn on power again" is displayed on the touch panel.


  1. After turning OFF the sub power switch, turn OFF the main power switch and unplug the power plug. Restart the main body after 10 seconds.
  2. Check the connector connection and the wiring between PRCB and ADUDB, and repair it if any abnormality.
  3. Check the connector connection on PRCB and ADUDB, and repair it if any abnormality.
  4. Replace ADUDB.
  5. Replace PRCB. 
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