Discussion about the Korg PolySix synthesizer

Oops.   I meant pins 4 and 10, not 4 and 5.
Sorry.


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On Wed, 8/24/16, Bob Grieb bobgrieb@yahoo.com [PolySix] <PolySix@yahoogroups.com> wrote:

 Subject: Re: [PolySix] Re: Trying to Restore a P6.
 To: PolySix@yahoogroups.com
 Date: Wednesday, August 24, 2016, 9:48
       
       
       One thing to mention...   When you see a signal
 that looks wrong at the output of
 
 a logic gate, the first thing to do is look at the inputs to
 that gate.   A floating or 
 
 incorrect input can cause the output to be wrong.   Also, if
 the gate is being 
 
 loaded down, that can affect its output.   To check for a
 load issue, with the synth 
 
 powered off, measure from pin 4 to ground, and also from pin
 5 to ground with a 
 
 multimeter in the ohms position.   Keep the polarity of the
 leads the same for 
 
 both measurements.  The readings should be similar, since
 both feed the INH inputs
 
 of 4051 chips. 
 
 IC23 contains four gates.   Of course, if one is bad, then
 the whole chip would be 
 
 replaced.  Just saying that each of the four gates has two
 inputs and one output 
 
 and they act independently.