SONY DD33 - FF/REW auto shut off problem

Discussion in 'Tech talk' started by matic777, Jun 10, 2021.

  1. matic777

    matic777 Member

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    I have a problem with DD33, the motor keeps running at the end of the tape - FF and REW only.
    It also doesnt stop if disengaged from the capstan.
    I have replaced the elements marked with red dot on the picture with no success.
    I feel like a blindman in the tunnel in the middle of the night, can someone give me some light please?
     

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  2. Silver965

    Silver965 Well-Known Member

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    Q607..?
     
  3. matic777

    matic777 Member

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    I don`t think that motor will work at all if the Q607 was in question
     
  4. Silver965

    Silver965 Well-Known Member

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    True ... but if the collector and emitter are shorted ... the motor will always be in motion
     
  5. radiorich

    radiorich Active Member

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    Very True Silver965!
    matic777 do you have a oscilloscope or a digital multimeter ? Because it is time to get yourself down and dirty and start looking at the voltages and waveforms Because Sony did amazing job providing them . have you ever used either of those two items ?
    Sincerely Richard
     
  6. matic777

    matic777 Member

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    Thanks Richard, Yes I have both, multimeter and oscilloscope, by voltages and waveforms you mean those they are written on the schematic?
     
  7. radiorich

    radiorich Active Member

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    matic777,
    Yes, and far as Sony Goes My Repair shop not only repair Sony but we sold them, and we were a factory Warranty service center I have had Sony Factory training back in the day. my repair business is a second income and hobby to me for about the last 15 years Since now my full-time job is helping to teach at a public school My students love when I bring into the classroom some of my older Sony gear like my 1950s pocket radio TR-610 or my Sony Cassette Walkman.

    My current Projects are A 27in Sony TV and restoring my 1970s Sony Am/Fm portable radio.

    Sincerely Richard

    P.S. the funny thing here in my small town there a place I like to eat, and they have a bakery the baker used to work and retired From Sony he worked at the warranty and service center in California.
     

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