Yaesu 5100 microphone

Discussion in 'Microphones, Speakers & Audio Processing' started by KB5DXG, Jan 28, 2011.

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  1. KB5DXG

    KB5DXG Ham Member QRZ Page

    I have an old Yaesu FT-5100 with a bad hand mic. Does Heil carry a replacement and if not what components are necessary to repair it?
  2. NG6R

    NG6R Premium Subscriber QRZ Page

    There are five stock hand mics for the FT-5100:
    1 MH-26D8 Hand Microphone w/1750 Hz Burst Button
    2 MH-26E8 Hand Speaker/Mic w/1750 Hz Burst Button
    3 MH-26F8 Hand Microphone w/DTMF Keypad
    4 MH-27A8J Hand Microphone w/DTMF Keypad
    5 MH-15D8 Hand Microphone w/DTMF Memory Keypad
    Which microphone do you have?

    The following are connections to the FT-5100 mic connector pins:
    1 Up freq
    2 +5V
    3 Down freq
    4 Speaker (if applicable), otherwise N/C
    5 Band
    6 PTT
    7 E (mic return/ground)
    8 Mic output

    When you say that you have a bad hand mic, what do you mean? Does the frequency up/down function work? If you have the MH-26E8 version, does the speaker work? Does the PTT switch function, as best you can determine? Have you measured the output of pin 2 to see if there is 5V present? If there is a band changing capability on your hand mic, does it function properly?

    I suspect that by “bad” mic, you mean that there is no audio when keyed, but that everything else works appropriately. If so, I suspect the microphone element. With the correct microphone model number, the service manual could be located and microphone element part number could be determined. It's also possible that all these mics have the same mic element part number.

    Good luck and 73,
    Jerry, NG6R
  3. W9GB

    W9GB Ham Member QRZ Page

    The Yaesu FT-5100 is a discontinued radio.
    A majority of the Yaesu accessories for this radio have also been discontinued.

    Your local amatuer radio dealer / retailer will have (or can order) a suitable replacement microphone
    from Yaesu, Heil or other third-party supplier.

    You have to perform electronics troubleshooting (DIY skills) to answer your question (which part is bad).
    You can contact Yaesu USA for the specialized parts (plastic moldings, etc.), IF the micropone is current production or parts are still available.
    Common electronics parts can be found at Mouser, DigiKey, Allied, Newark and other commercial/industrial electronics distirbutors and retailers.

    These these parts are NOT mfg. or warehoused in the USA,
    they must be ordered from Vertex's warehouse in Japan OR from the OEM suppliers in Eastern Asia.

    Yaesu Customer Service contact web page:

    Vertex Standard (Yaesu) USA
    Attn: Amateur Repair
    10900 Walker Street
    Cypress, CA 90630

    For Technical Support or Customer Service call, +1 (714) 827-7600 between 8 AM – 5 PM PST

    For Parts Department call +1 (714) 827-7600 (8 AM – 5 PM PST)

    Yaesu USA Customer Service, e-mail: customerservice@vxstdusa.com.
    Last edited: Feb 12, 2011
  4. KD8HLV

    KD8HLV Ham Member QRZ Page

    if the mic has low or no audio , those mics had a problem with the coupling electrolytic caps opening up. they used 50 volt caps and in use they only see a very small voltage so they go bad from lack of exorcise heh inside the mic you will see 2 circuit boards sandwiched together, seperate the boards and replace the 2 problem caps is the short version. there is one for the mic audio and one for the touch tone pad. use 6 or 12 volt caps instead of the 50 volt units . N4NLQ has a write up about the problem somewhere out there, find his write up and see if its the same mic you have. I brought 2 mics back from the dead with that procedure.

    good luck and 73
  5. W9GB

    W9GB Ham Member QRZ Page

    Allan, N4NLQ posted a December 2007 response in an Eham.net review of the MH-27 .

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