Archive of the former Yahoo!Groups mailing list: Discussion about the Korg PolySix synthesizer
Subject: Re: The Post I wanted to make....
From: jw_dewdney@yahoo.com
Date: 2016-02-09
HI Bob - sorry it took me awhile to dig the scope out and find the probes etc.
So - I got it all up and running and damned if i can see a signal ANYWHERE. From both TP4 and from the RESET (pin 4 according to the drawings i found) I get only positive DC offset and no pulses whatsoever. I double checked my with my Tek TX1 dmm - which does a nice job as a frequency counter also - and from TP4 I got 0.004 Hz (meaning zero) pulse activity at plus 4.9v offset... and from the reset pin I get about 0.24mV dc offset (positive). I'm getting positive offsets of betwen 1.5 and 5 volts on nearly every pin on the CPU. TP1 gives me 0.6-ish volts positive - so maybe that's got SOMETHING to do with it? Not sure. Still driving me crazy why that should be... I'm trying to follow the circuit back to the power connector but get a bit lost when i do...