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Old 03-25-2019, 06:21 PM   #21
R_J
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Default Re: Help identity blown part in Alesis Mixer PS

I suspect the MK-328 can't measure it properly. I will ask again, Is the power supply working or not?
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Old 03-25-2019, 06:22 PM   #22
Carm99
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Default Re: Help identity blown part in Alesis Mixer PS

Ill have to replace the 2200 cap and the small ceramic one then see if it works.
Ill let you know after that, what happened hopefully it wont blow the small cap again. again.
Thanks so far anyway.
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Old 03-25-2019, 06:29 PM   #23
R_J
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Default Re: Help identity blown part in Alesis Mixer PS

That small cap likely went on its own. and if you want to try the supply you can try it without that cap. installed for now. Like I said I doubt that 2200f cap is bad, if it was it would have either leaked or bulged.
The most voltage across the small .1f is 25 volts, It is not uncommon for them to fail shorted

Last edited by R_J; 03-25-2019 at 06:40 PM..
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Old 03-26-2019, 07:50 AM   #24
R_J
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Default Re: Help identity blown part in Alesis Mixer PS

Quote:
Originally Posted by Carm99 View Post
The 2200 big cap on the board is testing 0.00Ω esr.
Did you happpen to check the capacity of the cap also? or just the esr? That 0.00Ω esr seemed a bit odd to me. I guess the cap could be completely open and not measuring anything
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Old 03-26-2019, 09:09 AM   #25
Carm99
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Default Re: Help identity blown part in Alesis Mixer PS

Its not measuring any resistance on a multimeter either so I swapped it for a new one.
Power supply works now.I didnt leave it on for long though.
Im gonna check it again later.
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Old 03-26-2019, 09:37 AM   #26
R_J
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Default Re: Help identity blown part in Alesis Mixer PS

It could be that the 2200 went open and the poor little .1uf tried to do the filtering and failed.
Try using diode test with your meter, that should show something, then reverse the leads and check again
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Old 03-26-2019, 10:26 AM   #27
Carm99
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Default Re: Help identity blown part in Alesis Mixer PS

I tried that. It was the same.
Im gonna replace the rest of the caps anyway. Also those two 0.1uf ones.
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Old 03-26-2019, 03:40 PM   #28
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Default Re: Help identity blown part in Alesis Mixer PS

Quote:
Originally Posted by R_J View Post
Did you happpen to check the capacity of the cap also? or just the esr? That 0.00Ω esr seemed a bit odd to me. I guess the cap could be completely open and not measuring anything
Not necessarily meaning I had a capacitor ESR reading like that and when I check the new one I got the same exact results

I was also confused as well with the results

In fact I check this capacitor with a capacitor tester that checks UF readings and it readings were what should have been but I did replace it anyway

I would check a new capacitor with same exact UF value and the same exact voltage see if you get the same exact results
__________________
9 PC LCD Monitor
6 LCD Flat Screen TV
30 Desk Top Switching Power Supply
10 Desk Top Power Supply
10 Battery Charger Switching Power Supply for Power Tool
6 18v Lithium Battery Power Boards for Tool Battery Packs
1 XBox 360 Switching Power Supply and M Board
25 Servo Drives 220/460 3 Phase
6 De-soldering Station Switching Power Supply 1 Power Supply
1 Dell Mother Board
15 Computer Power Supply
1 HP Printer Supply & Control Board * lighting finished it *


These two repairs where found with a ESR meter...> Temp at 50*F then at 90*F the ESR reading more than 10%

1 Over Head Crane Current Sensing Board
2 Hem Saw Computer Stack Board

All of these had CAPs POOF
All of the mosfet that are taken out by bad caps
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