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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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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 |
#2
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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 |
#3
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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 -- Please remove one 's' from my address when replying by email. |
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