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Old 01-06-2014, 08:14 PM   #39
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Default Re: Repairing Alesis M1 Active mk2 Monitor Speakers

Originally Posted by momaka View Post
According to UC3844 data sheet, VCC needs to be at least 16V (plus/minus 1.5V) in order for the IC to start working and 10V (again, plus/minus 1.5V) for the IC to continue to work.

What you have sounds like a classic start-up cap issue. I suggest you replace the small electrolytic capacitor near the UC3844 IC.
Thanks, momaka.

I've already replaced the startup cap (C8). But, still no luck. When I power up the supply, the voltage across C8 is 15V, so this is within what is necessary for the 3844 to get working, according to your post.

Do you have any other suggestions for me to test?

Thanks in advance.
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