Yaesu 857 VFO dial broken

Discussion in 'Radio Circuits, Repair & Performance' started by KA2TVX, Sep 8, 2019.

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  1. KA2TVX

    KA2TVX Ham Member QRZ Page

    Bought a used FT 897 on ebay, noticed the VFO knob was loose, in fact it pulled off like in this video.
    Has anyone run into this before - do I need a new encoder, or vfo knob (don't think so), or do I need to disassemble the VFO and reassemble it and everything will be fine (hope so)?

    I cannot tell which part/assembly the shaft is part of, I just know that someone did not unscrew the set screw from the vfo. When you do that, you can remove the vfo from the shaft.

    Help appreciated!
     
  2. G4COE

    G4COE Ham Member QRZ Page

    Just incase you want any parts you might be able to get one from HiFiSSB here. Click on The Yaesu logo in the top middle window. If you grab a service manual there should be a parts diagram.

    Dave
     
  3. WD8BWW

    WD8BWW XML Subscriber QRZ Page

    The encoder is broken and will need to be replaced. Yaesu sells them. The optic wheel of the encoder is pressed on the end of the shaft. These loosen over time or as mentioned in the video someone pulls the knob without unscrewing the set screw. The encoder part number is Q9000709A.
     
  4. KA2TVX

    KA2TVX Ham Member QRZ Page

    I ordered the encoder today from digi key.
    I also just realized I put 857 in the title, and 897 in the text. It is an 897.
     
  5. W9GB

    W9GB Ham Member QRZ Page

    START WITH SERVICE MANUAL
    PAGE 4 : Exploded View of Major Parts in Radio
    NOTE the THREE Parts for KNOB and ENCODER (coil screw, washer, nut)
    ORDER what Parts you are missing from Yaesu USA Parts.
    ==
    Yaesu FT-897 Technical Supplement (Service Manual)
    http://www.arcticpeak.com/files/FT-897 Technical Supplement.pdf

    There are a number of YouTube videos for disassembly of Yaesu front panel
    for rotary encoder replacements (Clarifier, Main Tuning, etc.).

    Yaesu FT-897 Rotary Encoder
    Yaesu Part number: Q9000709A , Main Tuning Encoder
    OEM (COPAL, Japan) Part number: RES20D-50-201-1
    58A601C2-45FD-47AC-9779-091B48008B86.png

    UK and EU radio amateurs, Radioworld (UK) stocks this Yaesu Radio (Copal) part. £28.90
    https://www.radioworld.co.uk/yaesu-rotary-encoder-q9000709a-ft-897-main-tuning-encoder

    Digi-Key part number: 563-2073-ND
    https://www.digikey.com/product-det...ectronics/RES20D-50-201-1/563-2073-ND/6469509
    NOTE: The White Nylon Connector used by Yaesu (easy Plug-N-Play)
    is NOT on the “Raw COPAL part”
    EABC7CD5-56B9-424A-B8F9-8F6447939CC1.jpeg
    SAVE YOURSELF from Additional Bench Work ... Call Yaesu for Replacement Part.
    Yaesu USA Parts Department call +1 (714)827-7600 (8AM – 5PM PST)
    https://www.yaesu.com/?cmd=ContactUs&DivisionID=65

    Copal Rotary Encoder : REC and RES series
    Datasheet
    https://www.nidec-copal-electronics.com/e/catalog/rotary-encoder/rec&res.pdf
     
    Last edited: Sep 10, 2019

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