DIY Mixer Repair. Leaking capacitors? - Page 2 - diyAudio
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Old 3rd March 2013, 02:50 AM   #11
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Join Date: Mar 2013
Quote:
Originally Posted by Nigel Goodwin View Post
As it's two side by side channels, has it been struck on the knobs? - breaking the tracks inside the potentiometers.

I've seen two mixers like that, one a small mixer I bought off Ebay (which presumably got damaged in the post), the other a much larger mixer which had a good number of smashed pots - in a largish circle, obviously been hit by a football, with the centre pots smashed more than the outside ones.

Turned out the lady it belonged to had a young son, and the mixer had been sat in the conservatory
Haha kids these days... And the mixer is in great shape (besides from the issue with channels 1&2). Nothing is cracked or smashed and the insides look great as well. At this time I do not think the mixer has been previously dropped or smashed.
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Old 3rd March 2013, 11:25 AM   #12
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Quote:
Originally Posted by mcno91 View Post
Haha kids these days... And the mixer is in great shape (besides from the issue with channels 1&2). Nothing is cracked or smashed and the insides look great as well. At this time I do not think the mixer has been previously dropped or smashed.
It's not something you can see - a direct 'knock' on top of the knobs can break the track inside the pots, so a simple ohms test on the duff channels pots might be in order?.

It's something you'd find during routine fault finding (as I did), but without a circuit it's something that is easy to test for.
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Old 4th March 2013, 08:03 PM   #13
Enzo is offline Enzo  United States
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Samson is generally very responsive, if they do not respond by email soon, pick up your phone and call them in New York. Have the serial numbher of the unit handy in case they ask.
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Old 5th March 2013, 09:38 PM   #14
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Quote:
Originally Posted by Nigel Goodwin View Post
It's not something you can see - a direct 'knock' on top of the knobs can break the track inside the pots, so a simple ohms test on the duff channels pots might be in order?.

It's something you'd find during routine fault finding (as I did), but without a circuit it's something that is easy to test for.
Okay, I understand now. As soon as I can I will check. I've had to put the project on hold because of school but thank you!
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Old 5th March 2013, 09:42 PM   #15
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Quote:
Originally Posted by Enzo View Post
Samson is generally very responsive, if they do not respond by email soon, pick up your phone and call them in New York. Have the serial numbher of the unit handy in case they ask.
They were quite responsive and very courteous. Here's the real schematic now: FileSnack | Easy file sharing
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Old 6th March 2013, 12:15 AM   #16
Enzo is offline Enzo  United States
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Just to promote my theory then, from the schematic I see that channels 1 and 2 do share U3.
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Old 6th March 2013, 04:26 AM   #17
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Join Date: Nov 2009
Location: Los Angeles
If that gunk is acid (capacitor filling) it will be water soluble but glue won't be. Get a wet cotton swab and try cleaning it. If it IS acid it has to be cleaned off. I've seen the acid dissolve the copper traces off the board. Acid must be removed from UNDER the caps as well and if they're leaking they need to be replaced so buy your Silmics or FMs or whatever and get at it.

Remove bad cap, clean the board, replace the cap and clean off the flux.

G
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