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TC158R , Sony cass deck schematic please

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    TC158R , Sony cass deck schematic please

    Hi all

    This unit was working apart from noisy capstan motor .

    Popped off the back cover to clean brushes & lubricate it .

    When tested again it ran for a short while , then no power to deck .
    Attached Files

    #2
    Re: TC158R , Sony cass deck schematic please

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      #3
      Re: TC158R , Sony cass deck schematic please

      Check your work- either you didn't put it back together properly or there is a (new) broken connection, bad solder joint, cable connector etc.

      Sometimes working on the motor can cause a short with the built-in servo board or brushes etc. You could try disconnect the motor and see if the unit powers up, or too late and a fuse popped.

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        #4
        Re: TC158R , Sony cass deck schematic please

        Thanks Lotas & Redwire

        Suspect a safety resistor has popped somewhere .

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          #5
          Re: TC158R , Sony cass deck schematic please

          Really impressed with schematic quality , considering original only available on on paper manual .

          Q401 , type 2SD809-K , which is part of the capstan drive network found to have an O/C B - E junction .

          Replaced using the slightly more powerful BD139 .

          Motor functions now restored
          Attached Files

          Comment

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