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ua703 and ta7061 data

Discussion in 'Electronic Repair' started by [email protected], Jun 26, 2007.

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  1. Guest

    Hello all,

    I'm trying to fix a Yaesu FT-221 VHF transceiver. The fault seems in
    the FM-IF board, now I haven't been able to find on the net datasheets
    of the uA703HC (if amplifier?) and of the TA-7061AP (amplitude
    limiter?) integrated circuits. I checked all other semiconductors with
    DC test and they all look good. I will probably check all
    electrolytics with ESR meter but since this unit failed during a
    lightining storm I suspect a semiconductor fault. Anyone having even a
    paper copy of those datasheets? I would refund copy expenses.
    TIA

    Francesco IZ8DWF
     
  2. BH

    BH Guest

    Just Google both numbers. The 703 IC was a high failure item in the IF
    stages of many tuners. Usually open so a quick test was a small cap
    across the device.

    Bruce
     
  3. Franc Zabkar

    Franc Zabkar Guest

  4. Guest

  5. Franc Zabkar

    Franc Zabkar Guest

    I have no idea.
    NTE is in the business of supplying replacements:
    http://nte01.nteinc.com/nte/NTExRefSemiProd.nsf/$$Search?OpenForm

    You may also find ECG replacements with the same number, ie ECG703A
    and ECG1100.

    Go here for datasheets and suggestions for similar parts, although I'd
    be very wary of the suggestions:
    http://www.datasheetarchive.com/iso/

    The LM703 appears to be a match for the uA703:
    http://www.datasheetarchive.com/datasheet.php?article=4362103

    - Franc Zabkar
     
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