Error code C-1252 for Bizhub Press 1250 1250P 1052 Bizhub Pro 951

Code: C-1252
Classification: SD: SD-513/FD-504 abnormality
Cause:
A specified period of time has passed since the clam up down motor (M25) or the FD clamp up down motor (M53) starts the home position search operation. However, the clamp up down home sensor/Rr (PS30), the clamp up down home sensor/Fr (PS70), the clamp up down position sensor/Fr (PS125) or the clamp up down position sensor/Rr (PS128) does not become active. There is the difference between the detection of PS30 and PS70 during the operation of M25 and M53.

 Measures to take when alert occurs:

         The main body and the option stop immediately.                                                 
Estimated abnormal parts:
  • Clamp up down home sensor/Rr (PS30)
  • Clamp up down home sensor/Fr (PS70)
  • Clamp up down position sensor/Fr (PS125)
  • Clamp up down position sensor/Rr (PS128)
  • Clamp up down motor (PS25)
  • FD clamp up down motor (PS53)
  • FD drive board (FDDB)
  • SD drive board (PCB2)
  • SD control board (PCB1)
Correction:
         Press the help key to activate and deactivate the sub power switch (SW2) of the main body.
Note: 
  • Faulty part isolation allows you to use the machine temporarily.
  • The message "Please call service" and "Press [Help] to disengage" are alternately displayed.   
  • When you press the help key, the message "Please turn on the power again" is displayed.  
Solution:
  1. Check the clamp up down section, and if there is any abnormality, clean or repair it.
  2. Check the connector connection and the wiring harness between PCB2 and FDDB and the motor, PCB1 and the sensor. Then, repair them when there is any abnormality.(Wiring diagram: SD-513 (2/2): 2-B, FD-504: 8-E) (Wiring diagram: SD-513 (2/2): 18-O, 20-O). 
  3. Check the connector connection and the wiring  harness between PCB2 and FDDB and PCB1, and if there is any abnormality, repair them.
  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.
  5. Check I/O and the operation of the sensor, and if there is any abnormality, repair or replace it.
  6. Replace PS30, PS70, PS125 or PS128.
  7. Replace M25 or M53
  8. Replace FDDB.
  9. Replace PCB2.
  10. Replace PCB1.
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