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SBE Console II Blows fuse on transmit

Discussion in 'General CB Services Discussion' started by Plumber-G, Aug 5, 2018.

  1. Plumber-G

    Plumber-G Plumber-G

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    Waveform.jpg Well I did it now <GRIN> forgot to turn the antenna switch to the radio I was testing and my output dropped to about 1 watt, brought it back to the bench, No output and it blows the 3 amp fuse when I transmit.

    Tried transmit with 12 volt supply did not blow fuse but no transmit,
    Step-down transformer started making a intermittent humming noise, connected it to the scope voltage steady but weird wave form. see image

    I assume I blew the final and maybe took out the transformer or possible cap??



    Need some help to know were to go from here?? No Schematic

    Thanks Plumber-G
     
    #1 Plumber-G, Aug 5, 2018
    Last edited: Aug 5, 2018

  2. nomadradio

    nomadradio Analog Retentive

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    Odd deal. The service manual has everything but the schematic. The owner's manual has that part.

    Go figure.

    With any luck there won't be production-change differences between your radio and these two files.

    73
     

    Attached Files:

    #2 nomadradio, Aug 6, 2018
  3. Plumber-G

    Plumber-G Plumber-G

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    Thanks for the schematic, I think there was slight changes it appears the upgraded the final to a nec c1307 from a 2sc1239, but I have a much better grasp of what i am looking at.

    Do You have any thoughts on the waveform??

    Thanks
    Plumber-G
     
    #3 Plumber-G, Aug 6, 2018
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: SBE, Blown fuse

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