Anybody do any cb work that could give some advice?

Backwoods boy

Backwoods boy

CORNBREAD KILLER
Joined
Jan 25, 2010
Location
NWNC
I have a midland 77-092 (i believe) cb that was gave to me. Looks brand new and has original receipt from 1988. This things wasn't used at all. Everything works but there is a problem with the power/sound adjustment knob. I first hooked it up and couldn't here anything even with open squelch. Everything works but sound. I made sure everything was g2g as far as swr, wires etc and it was all good. I got to messing around with the knob and when i push in on it, you can hear sound and it works. There is a problem with the knob itself but it powers on and receives/transmits well, just no sound till you mess around with the knob. I know this is a cheap cb but it was free and practically looks new for a 27 year old cb but before i toss it, i was wondering if anybody had any suggestions for a cheap fix?
 
If you have , or can get some spray cleaner, spray it good with the power unhooked, then work the knob back and for for about a minute. Let it dry for about 10 minutes, hook up the power and try it.
I think Lowe's Hardware will have some spray cleaner that will work. If you still have a Radio Shack they will. Just make sure it is for electronics, contacts and switches.

Now the bad news.
The age of that radio puts it at about the time the controls were mounted on a vertical pc board set just behind the faceplate.
Pushing on it to make it work is an indicator of a bad board. ( cracked, bad solder joint, etc)

It's a toss up, and really no way to tell without actually looking or trying the spray cleaner ( which can be expensive.)



Matt
 
If it is a direct solder knob/PCB, see if you can take it apart and inspect the connections. It might be as simple as re-soldering the wires/pins to the PCB if they've broken.
 
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