Radio Shack TRC-503 CB Radio Logo

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Posted on Feb 17, 2009
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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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  • Posted on Feb 17, 2009
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Joined: Dec 26, 2008
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Does this radio have a pa/cb switch and if so is it on pa?

  • Anonymous 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
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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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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
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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
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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

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