Batboard

i am trying to make the internal speaker on my cdm 750 work. i was told i need to move an internal jumper. i have opened up my radio and i cannot find the jumper... please help!

I don't know about an internal jumper... but you could check inside the control head to see if the speaker is actually there and plugged in.

The internal speaker works by default. It is when when an external speaker is plugged that the internal one cuts off.

-Josh

Ive tracked down the problem, it was an issue with the power supply i was using in house for programming, thank you for the assistance.