The number one reason for not powering up is using the wrong AC adapter. It
needs to be center pin negative, not center pin positive. The number two reason
is probably a blown Q1 due to using the wrong AC adapter. The large diode near
it (D2) is also a common problem.
Don B.
From: aaron3900@...
Sent: Monday, December 23, 2013 2:10 PM
Subject: [korgpolyex] RE: korg poly 800 power
problem
I don't know if the OP got an answer to his question two years ago, but does anyone know what the most common reasons are why a Poly 800 won't power up? I notice that they sell Q1, the power-supply transistor, at Syntaur, so I'm assuming that's a part that goes bad often.
I'm asking because I have a couple of Polys that won't power up.
If anyone has any insight, I'd appreciate it.
Thanks and Happy Holidays!
Aaron