"Stephen Birchall" wrote in message
...
After reading all of the issues regarding the aforementioned mixer, I
decided I had nothing to loose by taking it to pieces and attempting
to test the power output stage. On dismantling all of the plug in
units, it became apparent that both of the output boards had come
loose either by shock or vibration despite being held in by crosshead
screws. After testing the transistors, which were OK, I plugged
everything back in a couple of times to clean the contacts and hey
presto, I now have a fully functioning unit again. So it is sometimes
best to try the simple things first, before spending a fortune.
(previously an electronics engineer had told me it would cost approx
£250 to fix because on his inspection, one of the channels had been
fried. I shan't be recommending him to anyone!)



Last one I had in with a blown power amp module, (couple of years ago now) I
just got another module from Yamaha.
Charge to the customer for the part was £75.

That quote contains rather a lot of labour then.



Cheers,

Gareth.