DC Servo turntable problem
 

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

That ic look some unknown to me.
But you can try to exchange all electrolytic capacitors

/Nisse

Lou deGonzague wrote:
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

On Mon, 15 Nov 2004 20:46:50 GMT, "Lou deGonzague"
put finger to keyboard and composed:

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

Is it the uPC1003C2 by NEC?


- Franc Zabkar
--
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