Hey electrical gurus!
So I've been given a broken amp. It just an Ashton GA50, nothing fancy. They guy who had it was complaining about scratchy pots and intermittent buzzing. I suggested some contact cleaner in the pots might be a good place to start and did say to bring it around and I'd do it for him.
He decided to have a crack himself. He gave them a spray and blew them out and left it all to dry. Plugged it in and had significant improvement.
Getting excited he started spraying everything again, including the power switch..... while it was still plugged in.
Buzz..pop!
So anyway, he's not bothered as it was just a spare one and he realises his mistake, but he's given it to me. If I fix it I can have it otherwise he said dump it.
I actually have another amp I could quite easily transplant into this box (which is better than the current one it's in) so if it's a write off, I can still make use of it.
I am really out of my depth with this kind of electronics. I've done some very basic stuff before with PCB's and I can solder fine, I get the basic concepts but I really don't know where to start here.
I think this is the correct schematic - it's very close at least from what I can tell. The fuses appear to be fine, they are like small old school automotive glass ones. I will double check with my multimeter.
http://schems.com/bmampscom/ashton/ashton_vp50.pdf
and what I mainly suspect is the two diodes in this picture - they are involved somehow in the power circuit and they do look a bit discoloured.
There is also what I think is a capacitor on the switch. I'm not sure why it would be there.. to make the light fade slowly when you turn it off?
Anyway. Any advice or direction welcome. I am leaning toward just modding it with the other amp parts and making a franken amp. But maybe someone will have a good idea of what it needs......