Euphonix AM713 psu repair

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ferrochrome

Well-known member
Joined
Oct 3, 2011
Messages
59
One more measurement. I disconnected AD board for input 1-8 and powered it back up. Here's the measurements at Q4:
1: -25,3
2: -20,5
3: -25,2

-18v is a bit high compared to the still approx 18v + rail. I'm not sure if this is way out of spec or if I can conclude that the only fault lies in the AD board
 

ferrochrome

Well-known member
Joined
Oct 3, 2011
Messages
59
Well I replaced that 100nF cap and it's running fine at -19,2V / +18,2V. The cap sat between the + and - rails before the opamp nearby, I'd guess to remove any noise on the supply. No wonder it burst into flames when it shorted. Herregud, this old beast does it's job well converting capi pre's on drums. Sounds great!
 

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