Tip & How-To about Galaxy Radios Radio Communications

GET YOUR BLOWN UP RADIO BACK ONLINE.

When you cant get your radio turned on. All it does is blow the fuse imeadiatlly hooking it to power. Most likely it is the (reverse polarity diode). The quick fix is to locate your diode? This diode usually is back behind a coil wound transformer on your board inside the radio and in the general area of where the possitive ans negative plug wires solder to the board! Usually it is black with a silver band around one end. If you clip it on one end or remove it this will restore your radios power. CAUTION:: When doing this ALWAYS use a dual fuse power cord . This will prevent this from happening again by blowing the fuse first. Doing this procedure will remove your thermal protection to the radio thus making it wide open to being fried for good if it ever gets hooked up backwards again. This is my reasoning for the dual fused power cord. Good luck!

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1 Answer

Does cam have wrong polarity protection


All devices that are electronic and are not OEM have a diode in the unit that protects against polarity reversal. If it is ever hooked up wrong, the diode will short and the fuse will blow, the unit will not power back on until the diode is replaced.

Sep 25, 2016 | Radio Communications

1 Answer

does my cobra 29 wx nw sound tracker cb radio have internal fuses


If you have reversed power leads you may have blow the protection diode and fuse. Well I am sure the fuse is blown if this is the case you may have been lucky and only popped the fuse if you replace the fuse an it blows also you will know for sure but be sure you don't use a larger fuse. Now we will assume the worst that the diode is blow. Remove the speaker side cover and with a pair of side cutting wire cutters cut D23. If you have trouble finding it its the second component from speaker jack next to a cylinder electrolytic capacitor it is a black component. This will stop your fuse blowing problem that was created when reversing polarity but unless you replace the diode you have disabled your protection if it happens again. It is a good practice to turn on/off switch to off position before connecting power. Take care .....hope this was of help.

Jul 27, 2014 | Cobra 29 WX NW ST 40-Channels Base CB...

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

1 Answer

I have a TRC 458 cb.... it keeps blowing fuses


It may have been reversed polarity on turn on. This can short out the polarity diode and then cause fuses to blow. This is a protection circuit so do not keep trying new fuses as the reverse surge can go into the radio deeper and damage it beyond repair.

Feb 02, 2010 | Radio Shack Radio Communications

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...

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