Help a Newbie Correct a Stupid Mistake..

[andrewz]

Hi,
I did a pretty stupid rookie mistake today and need some help now. I accidently jumped two posts against the chassis on my dpdt power switch while it was plugged in. There was just a quick spark, and now my amp won't turn on. I've checked the fuses and none of them blew. Can anybody tell me what it is i likely blew?
Here's some more info: the amp is just a stock little Blackheart bh5h, here's a link to the schematic:
http://www.rowbi.myzen.co.uk/Blackhe...2020070611.pdf
The two posts that got jumped on the power switch were empty, posts 3 and 4. Nothing looks obviously burned on the PCB. This wouldn't have fried the PT would it? I'm not even sure if posts 3 and 4 on a dpdt switch would be before the transformer (120v) or after (5v).
Any info at all would help, I'm (obviously) pretty new to electronics and would appreciate any advice on solving this. thanks in advance.

[tubeswell]

Sounds like a new PT is required

[Bruce / Mission Amps]

It looks like lugs three and four jumpered together would only blow your main chassis fuse or your house circuit breaker... however it could have simply blow the switch open too... it isn't a very expensively made switch.
The actual fuse holder could be defective now too.
Are you capable of removing the switch connections and bypassing them to the power tranny leads with jumper leads from your fused line?

[52 Bill]

...Are you capable of removing the switch connections and bypassing them to the power tranny leads with jumper leads from your fused line?

Or test the fuses, switch, fuse holder and line cord with a meter or continuity tester.

[andrewz]

thanks for your replies... I checked the switch and it turns out somehow it blew that to where it wouldn't turn on..(i didn't even think of that earlier). Luckily that's a nice cheap fix...
thanks again for your input...

[Bruce / Mission Amps]

thanks for your replies... I checked the switch and it turns out somehow it blew that to where it wouldn't turn on..(i didn't even think of that earlier). Luckily that's a nice cheap fix...
thanks again for your input...

Actually, that is not an uncommon repair with modern plastic switches and huge current surges.
They get hot and then deform in shape not allowing the contacts to either open or close correctly.