Repairing an old McIntosh : Part II - diyAudio
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Old 3rd January 2001, 03:21 AM   #1
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Thanks for a few replies on my last question. Since the last problem is occasional and therefore difficult to really locate, and I've tested a few things as suggested, I've decided to replace the filter caps and if the problem still remains, I'll replace the output transistors.
There is another problem, though. Once turned on, there is a tik-tik-tik.... sound coming out of the tweeter of both channel, loud enough to barely hear from about 2 feet away. This also causes the VU-meter (almost all solid-state Mc's have this meter) to continuously bounce slightly. Its sound is similar to alternately tapping the nails of our two fingers on the desk as fast as we can.
I've tried paralleling each filter diode with a small cap, but it didn't work. Any suggestion ?
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Old 5th January 2001, 12:29 AM   #2
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Replace the fliter caps in the low voltage section to. Your low level tic is proably a slow oscilation cause by the power supply having poor output impeadance caused usally by the filter caps being open or leaky.
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Old 5th February 2001, 12:16 PM   #3
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The sound fading out and the power guard light turning red is probably the cap in the feedback loop to ground going open.I own two MC2120.The same as yours less the meters.
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