Yammie CR-600 Power - Click - No Sound

[ringading]

Able to work on it a bit this weekend. Cleaned the coupler thoroughly and no juice - tried with rca jacks as well and no luck.

I pulled all of the transistors on the preamp board and they all tested good. Inspected the board for bad solder joints and poked around with a plastic screwdriver to see if I could make something happen and no luck there either.

Back to square one.

 

[avionic]

Have you got a scope ?

 

[avionic]

Need to verify your getting a source signal through the function switch to the pre-amps front end.
Could be a dirty function switch.