Static pips

[Performa6360]

Whenever I switch my Macintosh SE FDHD on or off, there is a static pip. Does anyone know why?

 

[Mars478]

Might just be the CRT

 

[Mac128]

Might just be the CRT

Nope.

Most likely a bad cap that needs replaced in the sound circuitry. They notoriously fail. An SE of this age most likely needs a full cap job anyway. Notice any other static during normal operation?

 

[Performa6360]

It is only when switching it on or off. Also, the sound always works fine.

 

[JDW]

Remove the back housing, keep your eye the analog board in a dimly lit room, and flip the power switch. For truly, if you hear a "static" kind of sound, then you will likely see a spark somewhere inside when you flip that switch. And where you see the spark is the source of trouble.