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Astatic mike problem

Discussion in 'CB and Export Equipment and Accessories' started by radiofoxtrot, Jun 19, 2011.

  1. radiofoxtrot

    radiofoxtrot Member

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    I have an Astatic D104M6B hand mike that is draining the battery even when I am not using the radio. Is this a component failure, the mike works fine when I install a new battery but after a few weeks of no use the battery is completely dead.


     

  2. Robb

    Robb Yup

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    The only way that mic is going to burn up a battery that fast, is that you are either ratchet-jawing a lot more than you realize - or the mic is inadvertently getting keyed up. The latter can happen if the radio has been turned off, and someone is sitting on the mic. Or something like that.

    These mics are either on - or off.
    Nothing in-between . . .
     
  3. radiofoxtrot

    radiofoxtrot Member

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    This is the second battery I have installed, tested then left the radio switched off with the mike laying on it's back. A few weeks later I come back to use the radio but the battery is dead. ?
     
  4. AudioShockwav

    AudioShockwav Extraterrestrial Admin
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    Is that the 9 volt model, or the 7 volt model? I never can remember......
    I think the Batt is switched by the key on the Mic, should not even draw unless the Mic is keyed.....anyone ever change the cord?
    Let me see if I can find the Schematic for that one....maybe a cap has shorted and eating the battery?

    73
    Jeff
     
  5. AudioShockwav

    AudioShockwav Extraterrestrial Admin
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    Go take a look at this:
    http://www.cbtricks.com/mic_manuals/astatic/d104-m6.pdf

    Look at where the Battery is on the Schematic, the (-) terminal is open until the switch is closed, and looks to be isolated from anything else.......unless something is shorting these two pins together when the Mic is not keyed, i do not see what is draining the battery.
    Might want to open the mic, and look at the connections on the switch.

    73
    Jeff
     
  6. radiofoxtrot

    radiofoxtrot Member

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    I have installed a new battery and will take voltage readings each day without it connected to the radio to see what happens.
     
  7. Se7en

    Se7en Well-Known Member

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    9v or 7v? i have two 7.5v models i had a 9v newer model(didnt like the element), check to make sure nothing inside is causing a connection between the battery and circuit board AkA (short).(y)
     
  8. radiofoxtrot

    radiofoxtrot Member

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    It's a 9volt version, I had a new spare mike so have now started using that as the voltage of the battery was dropping without even using the mike.
     
  9. TonyV225

    TonyV225 W9WDX Amateur Radio Club Member

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    What brand battery and are these batteries from a multi pack or seperate perchases?
     
    #9 TonyV225, Jun 22, 2011
    Last edited: Jun 22, 2011
  10. Se7en

    Se7en Well-Known Member

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    make sure the battery is not touching the circuit board except tze contacts
     
  11. Robb

    Robb Yup

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    The mic turns on the battery ONLY when it is keyed up. When unkeyed - the battery is out of circuit. So, something is initiating a partial contact. That is the only possible solution . . .
     
  12. radiofoxtrot

    radiofoxtrot Member

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    The batteries are single purchased Duracell.
     
  13. radiofoxtrot

    radiofoxtrot Member

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    There is a small type of metal clip at the bottom of the circuit board that is just touching the battery, do you think this is the problem. ?
     
  14. Se7en

    Se7en Well-Known Member

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    niet!

    can you post pictures of mic inside?
     
  15. radiofoxtrot

    radiofoxtrot Member

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    The metal clip just where the mike lead enters the mike touches the battery, but I have pulled it down slightly so will put a fresh batter in the original mike and see what happens.

    mike.jpg
     
    #15 radiofoxtrot, Jun 23, 2011
    Last edited: Jun 23, 2011

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