Radio shack trc-502 cb radio

If its RX audio you have lost then your audio chip is faulty or the speaker, try an external speaker or new internal speaker

Here is the owners manual I'l see if I can get my hands on a internal schematic

http://support.radioshack.com/support_electronics/doc62/62220.pdf

it was marketed in 1998.
http://support.radioshack.com/support_electronics/48054.htm

1998

My understanding of the TRC-502 is that it is 49 MHZ not CB. With that said I cant find
a microphone diagram for that specific radio. I found a 503 but that is a CB. I couldnt find a
wiring diagram for either radio. You could always call Radio Shack or The Shack, contact them online or call and ask for the info.
Call: 1-800-843-7422
http://www.radioshack.com/home/index.jsp

Hi! Thomas

There is NO capability to use a PA speaker with the TRC-503.

Sorry.

Try the radio shack website.
They have some service manuals that you can download.
Best of Luck!

503 a or plain old 503 . one is a hh the other is a radio .You can get one of them at www.cbtricks.com

Does this radio have a pa/cb switch and if so is it on pa?

Found what you need:

This comes in two parts -

first, this link:

http://www.eserviceinfo.com/download.php?fileid=34491

second, this link:

http://www.eserviceinfo.com/download.php?fileid=34492

save both to your desktop and execute part 1. It will create an Adobe PDF file. So make sure you have the Adobe PDF Reader installed - http://www.adobe.com/products/acrobat/readstep2.html