Vintage Synth Repair

--- In vintagesynthrepair@yahoogroups.com, "fsimon100" <fsimon001@...>
wrote:
>
> Hi,
> I just joined. I found three nonworking synths and bought them for 
> $30 each. A Prophet 10, Korg Trident mk II, and Roland Super JX 10.
> 1)The Prophet has some regulators in wrong. The 12v and 5V were 
> backwards but the 12V should have been fixed voltage and had a 
> varible regulator instead of fixed Vreg without feedback resistors. 
> Hopefully that fixes that. There may have been some big voltage on 
> the 5V circuit. I'm a little concerned because that reg open loop may 
> have been 37v. It lit up though while wrong just no sound.
> 2)The Korg had a memory battery leak on the board and fried some 
> traces. So PCB repair and new battery may fix that. I like my odds on 
> this one. It lit up too but no sound.
> 3) The Roland has good Power supply but nothing lights up. The whole 
> top LCD or LED plus all the buttons are out. I could appreciate 
> advice or if anyone has a schematic would help. If I get one synth 
> working I made a good purchase. I'm optimistic on the first two. They 
> light up and look like they want to work.
> 
> Thanks,
> Frank
> 
> I'll talk about my Hammond H-100 problems later.
>
I have Hammond H-100 parts