AUDIO SYSTEM ADS 12002 failed repair attempt - help needed!

coolnose

Member
2009-09-12 9:14 am
Hi All,

I have (at least tried) repaired a ADS 12002 2-channel amp.

It had fried the power supply fets.

Original Fet were ST 50N06 and I replaced them with Fairchild FRP50N06.

Resistors (10 Ohms & 4.7kOhms) and caps (10nF) were replaced with original values.

The only change to the original is that I replaced the 2 big 15 Ohms restistors (R85 & R86) after the transformer with 22 Ohms, the closest value I had on hand.

Diodes measure OK, so do the drivers and the Outputs.

The amp is blowing his 10A straight on turn on.

I'd need some guidance on how to proceed further.

Cheers,

Max
 

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