Cobra 148 GTL 120-Channels Base CB Radio Logo

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Question about Cobra 148 GTL 120-Channels Base CB Radio

3 Answers

142 GTL no sound

Tried 3 working mics, no audio at all, AM or SSB. I hear a slight sound from the speaker. External speaker no sound either. TX is perfect, and I can see I am receiving by the meter swing, I've just got no sound. I suspect an audio chip went bad>

Posted by Chris Kurdt on

  • Chris Kurdt Jun 07, 2007

    No go, same thing. Since I'm pretty new at this, troubleshooting that is, what's the partnumber for the Audio IC chip so I can have it replaced?

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3 Answers

Anonymous

I actually found the problem to this, a capacitor (10v) went bad, replaced it and it's perfect now! Thanks!

Posted on Jul 07, 2007

  • matt_lynch19 Oct 21, 2010

    which EXACT capacitor went bad? I'm having same problem with my 2000. I can hear only (very low) through the "aux" jack for sound and i can transmit audio perfectly and PA function transmits audio also but nuttin from headphones or speaker. I can also see signals comin in on meter i modulation meter swings when i talk. People can hear me fine but i cannot hear them.

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Anonymous

Part number is TA7222P 10 pin in line chip with radio faceing you part side up look on right side of chassie tward the back it's mounted on the board but fastened to the chassie use heat sink compound on new one when replaceing it and that's only if your SEAKER checks out okay!

Posted on Jul 07, 2007

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  • 3,130 Answers

Yeppers you have a common problem of the audio output IC being bad or a defective speaker. If there is an external speaker jack, try another speaker just to make sure. Good Luck

Posted on Jun 07, 2007

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Related Questions:

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I need wire 4 pin mic to a 5 pin mic cobra 142 Gtl?

you'll have to seperate the ground from the shield and then attach the rx,tx,and ground ,the shild then the ground thats on the shield.
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I need to wire a silver salute mic to a cobra 142 gtl 5 pin what color wire goes towhat mic pin

dont go by colors.. go by what wires are on the switch and mic element.. mics can be rewired and no one told you the colors could have changed FYI..

Pin #1 ~ Audio
Pin #2 ~ Shield
Pin #3 ~ Receive
Pin #4 ~ Switch Wire
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always go by connections not color of the wire. that way you learn and you can do any mic. to any radio.
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My cobra 142 gtl loses power about two minutes after keying the mic.

hi

it looks like the output stage is going hot (99%)

maby the swr is high end eficiancy is low

usualy on ssb the power is higher than on am


bernard




http://www.rylwy.com/
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Cobra 142 no audio

Check to make sure the ext speaker jack is not worn out. Even the internal speaker will not work if it is worn.
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TX oscillation

Make sure your boots are switched off and run the radio off a good car battery before you start looking for problems inside the radio. This problem may clear or change characteristics when the supply is changed.
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COBRA 21 GTL NO MODULATION NO RX. BUT IT WILL TX AT 3 WHATTS.I HAVE TRIED 3 DIFFERENT.MIC ON THIS RADIO CAN YOU HELP ME

That's usually a defective amc stage that produces RX audio and TX modulation. It's an integrated circuit that will require a tech fixing it. You will have a transmitted carrier with no modulation, and no sound in your speaker. However, make sure you have a good mike plugged in first, and substitute a known good mike to verify it's not the mike.
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Cobra 142 gtl no audio on receive work on pa, an on ext spkr get talk back,,,,but there no talk back in radio.... no audio on int spkr. tx good...

Hi and welcome to FixYa,

Initially, the speaker of course has been checked?

Offhand, would partial schematic of the mic and speaker section help?

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Good luck and thank you for asking FixYa.
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Cobra 148 GTL steady tone though speaker

try rerouting your coax cable and make sure it's long enough
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