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Sony Tape Deck TC FX 420R

Discussion in 'Troubleshooting and Repair' started by Keith Mills, Sep 9, 2017.

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  1. Keith Mills

    Keith Mills

    3
    0
    Sep 9, 2017
    I have a Sony tape deck TC FX 420R and am trying to replace the small belt (front) but cannot obtain manual or help from Sony support. The old belt was off when I opened up the deck so I have no idea how to run it.Can anyone show a diagram of how the belt is attached.
     
  2. 73's de Edd

    73's de Edd

    2,902
    1,232
    Aug 21, 2015
    Sir Keith Mills . . . .

    Here ya' go ! . . . . . . and would you like fries with that ?

    SONT Cassette Deck Blowup.jpg

    Belt goes around the large lead capstan flywheel item 158 and around capstan drive motor item M402's wheel / drum.


    73's de Edd
     
    Last edited by a moderator: Sep 16, 2017
    bushtech and kellys_eye like this.
  3. Keith Mills

    Keith Mills

    3
    0
    Sep 9, 2017
    Thanks Edd for your help but that is the drive belt you showed. It's the other belt a thin round one, I need a diagram for.
     
  4. 73's de Edd

    73's de Edd

    2,902
    1,232
    Aug 21, 2015
    Sir Keith Mills . . . . . .

    Ohhhhh-tay . . . .then.
    Cassette installed . . . try fast forward and fast rewind . . . .if no counter action . . .that is being your counter belt.

    Informatio Petita . . . .

    Sony Cassete Deck II.jpg


    73's de Edd
     
    Last edited: Sep 11, 2017
  5. Keith Mills

    Keith Mills

    3
    0
    Sep 9, 2017
    Thanks for diagram. Replaced belt and deck was working then developed a short somewhere. Now it powers on but not playing. Flywheel doesn't turn. Can any one help me diagnose the faulty part.
     
  6. 73's de Edd

    73's de Edd

    2,902
    1,232
    Aug 21, 2015
    Sir Keith Mills. . . . .

    Initially take DVM and place BLACK probe at marked BLACK square on schematic for ground referencing and then take RED probe and do a DC volts test at the RED triangle to confirm ~13VDC and walk down to the emitter of Q501 to confirm that it is regulating down to ~ 6VDC.

    Do the same tests at GREEN triangle to confirm ~ NEGATIVE 13VDC and then move to the emitter of Q503 to confirm that it is regulating down to ~ NEGATIVE 6VDC.

    With the unit in play position, confirm ~ 12VDC being across the capstan motor.

    Standing by . . . . .




    SONY SCHEMATIC SNIPPET . . . .

    [​IMG]


    https://s1.postimg.org/11ojm3xkwd/Sony_Cassete_Deck_III.png



    73's de Edd
     
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