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Magnum delta force

I was wondering if you could help me i have a magnum delta force mk1 i have been doing a repair on the light on the s meter on doing so i shorted the power by acciedent now the radio wont power up i have a radio for spares that i have had given to me i just cant locate the problem to change the blown parts please can you help i have a diagram of the circuit board something did smoke at the rear right side of the radio i have replaced a few parts but still cant get it to turn on kind regards paul

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  • paul smith
    paul smith Nov 01, 2008

    Hi Dean

    Thanks for the information i will try it tomorrow

    and i will keep you informed many thanks


  • paul smith
    paul smith Nov 02, 2008

    Hi Dean

    have replaced diode no joy still wouldnt power up

    tested the old one works fine

    anyway i seemed to of fixed it a different way?

    i ran a live wire from the positive wire on the back of the radio and then connected the other end to the positive side of the on/off switch on the front of the radio

    "YES" the radio works i have tested it and evertything back to normal i have now fitted a 2amp inline fuse to this line just in case

    thanks for the help





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What you saw smoke was the protection diode. I do not have one of these radios and have not worked on one yet, but most radios are the same where the protection diode is located on the pc board, one the components side, close to where the wire from the main power positive pin is soldered into the pc board.

I will have to do a little research to see if I can come up with the number of the diode. I have a couple of diagrams and a schematic from If I can not located it from their informaiton, I can contact my supplier Monday to see if he can tell me the number. If you happen to located the burnt diode before I come up with the information, please respond so I will know.

Dean Pitts
Rollin CBs

Posted on Nov 01, 2008

  • Dean Pitts
    Dean Pitts Nov 01, 2008

    After reviewing the schematic, I see that the protection diode will be D244. If you are good at soldering, you can pick one up from Radio Shack. The typical part number I use from Parts Express is 1N4007. I do not know which one Radio Shack will carry. Just make sure it is a 1n400*. It will be called a rectifier diode. Make sure when you replace it that you observe the direction of the arrow when you pull the old one out. Thesea are blocking diodes and have to be installed the correct direction.

    If you need any more assistance, please let me know. Also, if this fixes the problem or not, please reply.

    One more thing, when looking at the Main PC Board Layout, D244 is located at the right rear corner. Here is a link to the pc board layout.

    Look at the top right corner and find J101. Now look at the left bottom corner of J101 and you will see D244.

    Dean Pitts

    Rollin CBs



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