I don't have an SK-1 to tell you by looking at it's board and showing
you, but I can tell you where to find them using the SK-1 service
manual.

On p28 of the service manual (in the FILES section of this site), there
is the large schematic page.

Locate the CPU on the schematic (the large square chip on the page)

Pin 93, also labelled "SH" is the voice 1 audio output.
Now, find this CPU pin on your actual circuit board of the SK-1. Note
where it solders onto a circuit track on the board, and follow the
circuit track away from the CPU until you hit the first solder joint
where a component (a 100k resistor) joins the track. Follow through the
resistor to the other side of it. Solder a wire to this joint. This is
now your audio out for voice 1 (if you want more volume, solder it just
BEFORE the resistor).

Pin 89, also labelled "EH" is the voice 1 CV (or "envelope signal", as
the manual calls it) output. Find this pin on your actual circuit board
of the SK-1. Note where it solders onto a circuit track on the board,
and follow the circuit track away from the CPU until you hit the first
solder joint where a component (a diode) joins the track. Follow
through the diode to the other side of it. Solder a wire to this joint.
This is now your CV out for voice 1. The diode will protect the CPU
from any back flow voltages, so make sure you connect AFTER the diode.

For other audio outs and CV outs of the other 3 voices:
Pin 90(EG) - voice 2 CV (envelope) out
Pin 94(SG) - voice 2 audio out

Pin 91(EF) - voice 3 CV (envelope) out
Pin 95(SF) - voice 3 audio out

Pin 92(EE) - voice 4 CV (envelope) out
Pin 96(SE) - voice 4 audio out

The CPU pinout table on p6 and 7 shows this list

You can then do the same with the circuit tracks with these other
voices if needed.

Cheers, Graham


--- In CasioSK@yahoogroups.com, "oscillate_wildly1"
<oscillate_wildly1@...> wrote:
>
> Does anyone know where these two points are on the SK-1? Thanks x
>