Hi Sam
I think the first thing is to do is to unplug Cn3 connector that go to CPU board just to be sure there is no short on that board, then check if you have supply at pin 1 of Q3 (emitter)or at + of capacitor C2
if no voltage you may have a defective part in the power supply board check D1 ,Q3 or the zener diode D5 ,i have put the power supply schematic in the file sectionhope it will help
if you need it i have the complete A37 schematic
Z3
--- In vintagesynthrepair@yahoogroups.com, "artmansam" wrote:
>
>
>
> Hello,
>
> I have a Roland A-37 MIDI Keyboard Controller that doesn't power up.
> I actually bought this at an estate sale to resell --- but there was no joy when I got it home and plugged in a power supply.
>
> I've seen numerous other ones just like this for sale online ---"looks like new but won't power-up"
>
> I'm guessing there might be a common fix --- such as an inline fuse.
> Anyone know?
>
> Thanks,
> Sam
>
>
>
>
> Hello,
>
> I have a Roland A-37 MIDI Keyboard Controller that doesn't power up.
> I actually bought this at an estate sale to resell --- but there was no joy when I got it home and plugged in a power supply.
>
> I've seen numerous other ones just like this for sale online ---"looks like new but won't power-up"
>
> I'm guessing there might be a common fix --- such as an inline fuse.
> Anyone know?
>
> Thanks,
> Sam
>