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SBE Console II Blows fuse on transmit

Plumber-G

Plumber-G
Nov 17, 2012
69
16
18
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
 
Last edited:

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
 

Attachments

  • sbe_16cb_console_ii_sm_.pdf
    8.1 MB · Views: 3
  • SBE16cb_OM.pdf
    16 MB · Views: 2
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
 

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