I suspect you are not applying the 47K resistor correctly.
Here is what that procedure is actually doing:
The CPU should be held in reset as power is first turning on or as it's turning off.
The 5V supply comes up as a ramp when you turn on power and a negative ramp
when you turn it off. The voltage ramps from 0V to 5V, then stays there at power up.
What they want is for reset to be asserted (all of the LEDs on) until the voltage
is pretty close to 5V. When you connect the resistor to the correct points, it
changes the power supply setting a little bit so that the 5V output is lower than 5V.
(This is just temporary, while the resistor is connected) Now you set the trim pot
so that reset just comes on at this new, slightly lower voltage. Now if you remove
the resistor, the 5V should go back up to its correct value, and the LEDs should go off.
If nothing happens when you remove the resistor, that sounds to me like you are not
connecting the resistor correctly, so the 5V is not changing when you connect it,
or when you remove it. In that case, if you make reset come on, it will stay on.
Please measure the 5V supply at the 367 bd and confirm that it is dropping when you
connect the resistor.
BTW, since you are using a lower value than suggested, you will get more voltage change
than what they wanted. If you don't have a 56K resistor, use 47 + 10K to get 57K. Much
closer. Just twist the leads together and then solder them to get a good connection.
The resistors should be in series, of course.
I don't understand any of what you said about resistors in parallel with zeners to make them
work. That really makes no sense. You do need the correct current through the zener itself.
Too little and you won't get the proper voltage. Too much and you will exceed the power
dissipation of the zener and it will be destroyed. So you need the correct series resistor.
Here that is R41, 120 ohms.
Bob
--------------------------------------------
On Sat, 2/13/16, jw_dewdney@yahoo.com [PolySix] <PolySix@yahoogroups.com> wrote:
Subject: [PolySix] Re: PROGRESS!!!!
To: PolySix@yahoogroups.com
Date: Saturday, February 13, 2016, 2:44 AM
Thus far the MG, EG, VCO, VCA, EFFECTS, PROGRAM
sections have been unresponsive. Though the ARP, KEY ASSIGN
and other basic functions seemed to work okay (and all
voices seem to be more or less tuned (which is nice) even if
I can only get the upper octave to work (one thing at a time
right?) - SO - THAT BEING SAID - i thought i'd see if
the reset and calibration procedure would set things right -
so turning VR1 clockwise - i got everything to light up
correctly - but when i remove the 56K resistor (was actually
a 47K- hoping it was close enough) - there is no change in
state (sad face)... so that's the current status.
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