GET YOUR BLOWN UP RADIO BACK ONLINE.

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.

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.

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.

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.

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