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Sony STR 7065 - AM/FM Issues

Discussion in 'Solid State' started by prubino, Jan 12, 2018.

  1. prubino

    prubino New Member

    Messages:
    46
    Any help on this would be appreciated. I picked up a Sony STR 7065 receiver that was in need of a good cleaning and deoxit bath.

    After completing this, the receiver is physically in good condition, and all functions tested as working with one exception. The FM reception only pulls in stations from around 101fM and up on the dial. Aything below this comes in as just static. It is the same for AM reception as well at the exact same spot on the reception dial.

    Any thoughts on what may be causing this?
     

     

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  2. Tom B

    Tom B AK Subscriber Subscriber

    Messages:
    1,494
    Location:
    Bay Ridge, Brooklyn New York
    What does "Good Cleaning and deoxit bath" mean? How did you clean the tuner section?? did you spray anything on the board or into the tuning Capacitor?? If you sprayed, what did you use??
     
  3. prubino

    prubino New Member

    Messages:
    46
    I used Deoxit only on the potentiometers and short bursts of canned air to clean out some of the dust.
     
  4. NAD80

    NAD80 Super Member

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    Location:
    Carlisle PA
  5. prubino

    prubino New Member

    Messages:
    46
    NAD80 . . . Thanks!
     
  6. dshoaf

    dshoaf That high voltage buzz Subscriber

    Messages:
    10,184
    Location:
    RIP 1954-2018
    Yep, you local oscillator stops working. That's the technical term for the part of the tuner that causes you to hear different stations as you tune across the dial. On this Sony, it is likely that the part of that moving capacitor with the metal blades that mesh into each other is the root cause. In the linked procedure to clean them, you'll be using some DeOxit to clean the fingers at the pivot point where the electrical connections are made to those blades.

    That Sony is one of all-time favorite receivers from the mid-70s. Treat it well and it will serve for many more years.

    Cheers,

    David
     

     

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  7. dr*audio

    dr*audio Fish fingers and custard! Subscriber

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  8. prubino

    prubino New Member

    Messages:
    46
    OK . . . I followed the link from dr*audio. I used and some a universal contact cleaner from Rawn that mentioned it was non-residue cleaner. I applied some DeoxIT Fader F100 and that seems to have completed the fix. I am now getting reception across the dial for both AM and FM channels.

    Thanks for all the feedbaxck!
     

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