Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hi Khron666,
I replaced C8 with a Vishay 220uF 50V High Temp (-55C to +105C) 20% tolerance.
[url]http://www.mouser.com/ProductDetail/Vishay/517D227M050CD6AE3/?qs=%2fha2pyFaduhK1AmTFR7qBEZ6p3lxijK%252bbFuzajEWapm3fAdy8bzWi3CsWFFPlKcw[/url]Re: Repairing Alesis M1 Active mk2 M...shay/517D227M0...
ernie_ohio
New Member
Last Activity: 01-07-2014, 06:50 AM
Joined: 12-23-2013
Location: Ohio
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Re: Repairing Alesis M1 Active mk2 Monitor Speakers
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....Leave a comment:
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Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hi Khron666,
I tested Vcc on the UC3844 (pin 7 to ground). The value was toggling between 13.2VDC and 10.8VDC once a second....Leave a comment:
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Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hi Khron666,
Thanks for the reply. Yes, I saw your original post. My C8 is right next to the power resistors and the Q1 FET/heatsink. I did replace this component already per your earlier post. But, there were other parts that were visibly damaged when I began to investigate.
So far, I've replaced:
-C8, R3, R4
-Q1 FET, Q3, Q4, C15, R15, R11 (all showed visible signs of damage)
-UC3844N
NOTE: I mispoke in my previous post. I did not replace both...Leave a comment:
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Re: Repairing Alesis M1 Active mk2 Monitor Speakers
budm,
Yeah, I'm looking to replace the T1 transformer. I'm getting 330V on the primary of the transformer. But, the secondary does not have a voltage reading.
I already replaced the MOSFETs, as they had gotten damaged.
Maybe I'm missing something else?...Leave a comment:
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Re: Repairing Alesis M1 Active mk2 Monitor Speakers
Hey guys, I'm a newbie to the site. Looking for guidance with my Mk2. The power supply got cooked pretty good. I've had to replace quite a few parts. I'm to the point where I'm getting power to the T1 transformer. But, not beyond that. So, I need to replace that component. Does anyone know where I can source that part? I can't seem to find the appropriate replacement based on the schematic or BOM numbers.
Thanks in advance!Leave a comment:
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