Question about Radio Shack TRC-503 CB Radio

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Problem with TRC-503 Radio Shack CB

I hooked it up to power - the only light that comes is the RX led. No channell lights or sound. When I key the mic - the TXl ight comes on. Whats up?

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

Posted on Feb 17, 2009

  • Tom Arsenault
    Tom Arsenault Feb 17, 2009

    I see there is no pa but make sure the other controls are on cb, instead of weather, etc

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As this radio shack trc 503 cb radio will only transmit but it has loss it audio sound and no noise as nobody seems to don't why this has loss it audio and soun


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

Oct 24, 2013 | Radio Shack TRC-503 CB Radio

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I have a TRC 502A CB radio that hasn't been used in about 5 yrs. I recently tried to use it and when I transmitted, the audio came thru the speaker. Any idea what's wrong?


it could be grounded inside...Somebody may had it set for Talkback features.. Take it apart look for speaker wires (see if soldered to resistors) if its shorted seperate wires ..just have speakers wires attached. Try external SPKR. Try different mics or radio may have gone bad completely.

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Need the wiring for mic on trc 502


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

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Need to replace microphone on a Radio Shack TRC 447 CB. 6 pin Anybody know?


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When mic is keyed, TX light illuminates but power meter does not


make sure your s/rf switch is in the right place on the radio is the most common problem i have found

Feb 05, 2009 | Radio Shack TRC-447 CB Radio

1 Answer

Radio shack trc-502 cb radio


YOU CAN GET SCHEMATICS FOR THAT MODEL
I JUST LOOKED IT UP FOR YOU........THE BOOK IS SAMS PHOTO FACT...WEBSITE IS

WWW.SAMSWEBSITE.COM

THEY HAVE EVERY CB RADIO EVERY MADE

GOOD LUCK

Jun 22, 2008 | Radio Shack TRC-503 CB Radio

2 Answers

I need schematics for my radio shack trc-503 cb radio


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

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Mic wiring diagram


Want to wire cobra mic to a uniden washington radio

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