Cause:

Possible causes of SC672 include:

• USB communication path failure (USB cable, IPU)

• CTL boot up error and/or operation panel boot up error due to abnormal break in operations of CTL.

Possible causes of operation panel cannot light include:

• USB communication path failure (USB cable, IPU)

• Operation panel cannot communicate with CTL due to CTL boot-up error

  

  [A]: Operation Panel

  [B]: IPU

  [C]: FCU

  [D]: Controller

  [E]: USB cable