Just to be picky, this is a JFET, so that would Drain-Gate-Source, not Emitter-Base-Collector. Also, depending on your meter, you might not get a display of 0L for the reverse directions. My meter on diode setting shows 1.533v when nothing is attached and continues to show this with Black on Gate and Red on either of the other two pins.
Don B.
________________________________
From: Boddington <
f115@rocketmail.com>
To:
PolySix@yahoogroups.com Sent: Thursday, April 18, 2013 3:50 PM
Subject: [PolySix] Re: Please HELP Korg Polysix KLM367a Repair
Don an Jed are on the right track in their questions. I would just add a few observations:
1. You can test Q1 with your multimeter if you have a diode setting on it. You can test each compbination of pins. It will tell you whether the transistor is faulty or not.
------------------------
Red on B
Black on E - should read .5 - .9
Red on B
Black on C - should read .5 - .9
then reverse
Black on B
Red on E - should read OL
Black on B
Red on C - should read OL
but then, to be sure:
E > C = OL
C > E = OL
------------------------
2. Although Jed is completely right that we need more details, it's not totally unusual for the patches to go really weird after damage like this. Sometimes it's just he battery itself that has died and the memory has corrupted. Before you begin removing more and more parts, an early test would be to just create a new clean patch (after and a new battery install) and save it. See if it remains as expected. It at least gives you an audible result. It's nothing definitive but it will provide some easy hints.
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