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DC Servo turntable problem

Discussion in 'Electronic Repair' started by Lou deGonzague, Nov 15, 2004.

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  1. I am trying to fix a Magnavox turntable(MCU061) made by Nippon Columbia Co.
    The transformer was bad(open primary) so I subbed AC power to the board
    through a variable AC supply. It will run at about 4v at the correct speed
    but it's very unstable and the 33-45 sw does nothing. I think the chip
    controlling the motor is bad but I can;t see anything like it in the NTE
    catalog. Here is a pic of the board.
    http://home.nycap.rr.com/zenithradio/board.jpg
    If I increase the voltage the motor just goes faster, there is no
    regulation. Is there any source for info on these or where to get the IC?
    Thanks email
     
  2. That ic look some unknown to me.
    But you can try to exchange all electrolytic capacitors

    /Nisse
     
  3. Franc Zabkar

    Franc Zabkar Guest

    Is it the uPC1003C2 by NEC?


    - Franc Zabkar
     
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