Icom 737 no audio on transmit

Discussion in 'Radio Circuits, Repair & Performance' started by KD3YT, Jul 23, 2020.

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  1. KD3YT

    KD3YT Ham Member QRZ Page

    I have an Icom 737 that when operating SSB and you talk into the mike, their is no audio transmitted. Have tried a new mike. Any ideas what this might be? Have noticed that you can buy some of the boards on Fleabay. Which board would the microphone circuit be on?

    Thanks in advance,
    Butch KD3YT
  2. G4COE

    G4COE Ham Member QRZ Page

    To begin with we need to try AM and FM modes to see if they work..... if they do the mic. is OK.

    We need be careful here, some Icom mics. use a condenser mic. insert and require an 8V supply.

    You need to tell us what the models are.... the IC737 comes with a HM-36, rather than describe be better if you looked yourself. Here's the innerds of a HM-36.

  3. KD3YT

    KD3YT Ham Member QRZ Page

    Both mikes are the HM-36. The one that originally came with the radio and I bought a new one. Will try the AM and FM modes as soon as I can.

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