Question about Uniden Bearcat Pro PC68LTW 40-Channels Base CB Radio

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I have sound but no tsmt,the tsmt light does comes on,no output

Power was hooked up backwards & I replaced everything blown in power input and now I have receive but no tsmt at all

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Well that leaves 2 mor parts the transmit final and the current resistor these have straight 12 volts applied when the radio is turned on . if you look at the final it will be burnt or blown apart on the heat sink. replace them and you shoul be up and talking again.

Posted on Mar 10, 2009

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Cobra 29 nhst d8 blown


Check with a ohm meter for a short to ground on that diode.

If it is the protect diode at the power plug the unit likely got hooked up backwards to power.

A dead short there with the diode removed indicates a short---start disconnection of parts before and after the power switch to locate it.

Mar 22, 2012 | Cobra 29 LTD CB Radio

1 Answer

Got given a CB radio.. from a trucker... im in the [UK] wanting to put it in my car.. accept the voltage difference... a truck's voltage is about 20-30-volt's.. compared to a car.. only being 12...


sounds like your in good shape if its a 12-14v output.. the things about people blowing up radios is they use 10-30amp fuses and hook them up backwards.. + to ground and ie... make sure to use a 2 - 5 amp fuse for a normal cb.. and go + to + and - to -...

Aug 21, 2011 | Uniden Bearcat Pro PC68XL 40-Channels Base...

2 Answers

I have a trc447cb radio, it kept blowing fuses, please help thanks...


This radio has been hooked up backwards. CB radios cannot be hooked up backwards or it will destroy it. However this is hope.

Because they can be damaged this way, there are polarity protection diodes in the radio that will blow if the radio is hooked up backwards, before it can hurt anything in the radio.

They are usually N1004 diodes. Is a big black diode that has a white stripe. And if it is blown, it will most likely be Black and burnt.

Open the radio, and look near the power section of the radio. It will be in the back near where the power cord plugs into it.

Look for a burnt black diode. That is the protection diode.

Get an N1004 or better from radio shack, and remove the burnt one, and put the new one in, making sure to put it in with the white strip on the same side as the original.

Once you have finished. Make sure the polarity is correct. Then hook up the radio, and turn it on. Should work fine.

If you want to validate that it is the correct diode, if you pull on leg out of the board, and turn on the radio, it will turn on. When the diode blows, it prevent the power from getting to the board, if you take it out, it will let it through. CAUTION. The radio will work again if you just remove the burn diode without replacing it. But if you hook it backwards again, it will be toast, and as good a door stop.

Sep 05, 2010 | Radio Shack TRC-447 CB Radio

2 Answers

When i turn on the cb it does not light up and no one can hear me.


Check the in line fuse to make sure it is not blown. I would also check the cb pa switch

Jan 27, 2010 | Cobra 19 DX IV CB Radio

2 Answers

Blowing fuses when power is hooked up


once you've done this, hooked up a radio backwards, you have to change the resistor...take it to a shop I only charge $18

Nov 26, 2009 | Cobra 29 LTD CB Radio

1 Answer

Keep blowing fuses probably crossed wires hooking up looking at a wiring diagram and cb to find what is blown so I can replace Thanks


Most likely you have blown the protection diode in the power input section. Simply replace the diode with the equivalent, it may be a 1N4004 diode.

Aug 16, 2009 | CB Radios

1 Answer

No power to radio wont even turn on


The most likely thing is what we techs call revers polarity. this means that the customer accedently hook up the power in reverse. this happens more often then not. The fix for this is to replace the 1 amp diode that goes between the negative and positive power input on the board. the Diode number is a 1N4007 or any 1amp silicone diode. You will also see that once Blown diode is cut the radio will come back on. this does not mean the radio is fixed what this means is that the shorted diode has been removed from the circuit. which also means the radio has nom protection until the diode is replaced.

Patrick Patterson N5SLI

Jun 01, 2009 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Radio wont light up


Check the inline power fuse first/or replace it! If that does'nt work then next make sure the radio is in the operating possition on the switches labeled>cb/pa< to cb mode. If this does'nt work then you may have a wire from your power plug inside the radio broken loose or a blown diode. If in fact the wire is connected inside the radio the diode would be my next guess. This happens when the polarity of the radio is reversed(hooked up backwards). This can be fixed relativley easy at your local radio shop for about 30$. Good Luck.

Dec 18, 2008 | Cobra 29 WX NW ST 40-Channels Base CB...

1 Answer

Diode or not


The first thing to check is the inline fuse. If it is blown and a new one does the same, you may have a shorted reverse polarity diode across the power input. If you need further information on how to check and replace it let me know.

Oct 04, 2008 | Cobra 29 LTD CB Radio

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