Error code C-1243 for Bizhub Press 1250 1250P 1052 Bizhub Pro 951

Code: C-1243
Classification: SD: SD-506 abnormality
Cause:
The folding exit home sensor (PS24) does not become active within a specified period of time after the folding sub scan alignment exit motor (M8) starts the home position search operation. Alternatively, even after a specified period of time after M8 starts to decelerate, it does not stop. 
Measures to take when alert occurs:
         The main body and the option stop immediately.                                                 
Estimated abnormal parts:
  • Folding dub scan alignment exit motor (M8)
  • Folding exit home sensor (PS24)
  • SD control board (SDCB)
  • SD drive board (SDDB)
Correction:
         Press the help key to activate and deactivate the sub power switch (SW2) of the main body.
Note: 
  • When you isolate the faulty part, the limited use is available.
  • The message "Please call service" and "Press [Help] to disengage" are displayed alternately on the touch panel   
  • When you press the help key, the message "Please turn on the power again" is displayed on the touch panel.  
Solution:
  1. Check the folding sub scan alignment section, and clean or repair it when there is any abnormality.
  2. Check the connector connection and the wiring between SDDB and the motor and the sensor, and repair it when there is any abnormality.
  3. Check the connector connection and the wiring between SDDB and SDCB, and repair it when there is any abnormality.
  4. Check the I/O drive of the motor and the coupling of the gear, and repair or replace it when  there is any abnormality. (Wiring diagram: SD-506: 10-D)
  5. Check I/O and the operation of the sensor, and repair or replace it when there is any abnormality. (Wiring diagram: SD-506: 14-D)
  6. Replace PS24.
  7. Replace M8.
  8. Replace SDDB.
  9. Replace SDCB.
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