Discussion in 'Homebrew and Kit Projects' started by W2HFF, Apr 13, 2021.

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  1. W2HFF

    W2HFF Ham Member QRZ Page

    I recently picked up an IC-701 transceiver. The PLL is unstable. I have schematics but not the complete service manual. Does anyone have one? I can't find one online. The manuals listed as service manuals are actually user manuals. Specifically, there are many pots in the PLL and am looking for the alignment instructions.

    Thanks and 73
  2. W9GB

    W9GB Ham Member QRZ Page

    The Icom IC-701 HF transceiver was Icom’s pioneer solid-state HF transceiver of the mid-1970s,
    with a Digital Phase Locked Loop Synthesiser (one of the first).
    It also uses a Ledex Switch and Rotary Switch wafers.
    Philip Storr tackled repairs in 2013 to his IC-701 (in repair pile).

    There are Icom specific bench techs, you may provide assistance (parts, advice)

    Scott Malcom, Malcom Technical Support, in Toledo, Washington

    Bud Garside, W7ARS in Sherwood, Oregon
  3. W2HFF

    W2HFF Ham Member QRZ Page

    Thanks for the comments, got the PLL fixed, now on to fix the AGC......
  4. K0UO

    K0UO Platinum Subscriber Platinum Subscriber QRZ Page

    Icoms 1st Great HF here in the USA

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