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Alesis M1 Active Mk2 condensator question

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Alesis M1 Active Mk2 condensator question

Postby Phunky » Thu Oct 12, 2017 1:17 pm

I had to switch a condensator in one of my speakers(a known M1 problem).
I purchased and used a 220uF/35V as recommended in several repair guides, but the one I removed is 330uF/35V.
Is that a potential problem?. The speaker seems to work just fine.
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Re: Alesis M1 Active Mk2 condensator question

Postby Hugh Robjohns » Thu Oct 12, 2017 2:29 pm

The working voltage and operating temperatures are the two critical parameters from a capacitor failure point of view. You appear to have matched the 35V spec, so no hopefully problem there...unless the reason for the first failure was an inadequate voltage rating. You don't say what the temperature rating is on the failed or new capacitors.

As for the actual capacitance value, if we're talking about a power supply application more is usually better and I'm a little surprised that you have been advised to down-rate it. How this will affect things, though, depends on where it is in the circuit and what its role is -- and as I know neither I can't comment any further.

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Re: Alesis M1 Active Mk2 condensator question

Postby Phunky » Thu Oct 12, 2017 3:26 pm

According to the service manual it's a 220uF/35V/105° condensator(C8):
Alesis M1 Active MkII (8N) Service Manual P/N: 8-31-0105-A

But, the one I removed was a 330uF/35V/105° version.

A friend of mine used to have a pair of M1s, and I remember swapping one of mine for one of his some years ago, but I don't remember if his had been repaired prior to lending it to me.

The only schematics that I've found so far are all listing a 220uF capacitor, and the repair guides says that anything between 220uF and 470uF will work.
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Re: Alesis M1 Active Mk2 condensator question

Postby Hugh Robjohns » Thu Oct 12, 2017 3:46 pm

Sure, the 105 degrees spec is important.

So it looks like the original capacitance value is 220uF, but larger values are acceptable -- as I said earlier, bigger is usually better! ;-)

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Re: Alesis M1 Active Mk2 condensator question

Postby Phunky » Thu Oct 12, 2017 6:41 pm

Thank you Hugh. It's my first attempt at repairing electronics, so your input is much appreciated. That the speaker works again is a minor miracle :headbang:
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