Korg DW-8000 - Page 38

2)
Place
a
1,500
gram weight on
each key
in sequence
and
note
the
keys
that give the lowest
(the
low weight key)
and
highest
(the
high weight
key)
impedance values.
Mark
these
two
keys
(with
tape, etc.).
General standard: The
low
weight
key
is
a
white key
and
has an
impedance
value
of
3
ohms
or less.
The high
weight key is
a black
key
and
has
an
impedance
value
of
500
ohms
(±10%).
3)
Connect
an oscilloscope
to
KLM-759
CN21
1-pin
(out-
put)
and
3-pin
(GND).
Connect to
CN23
which
was
previously
disconnected.
4)
Place a
500g
weight
on the front of the low
weight
key
found
above.
Adjust
VR1
so
that output voltage crosses
the
0V
line
(rising
from
-
to
+)
within 2 to
8
seconds
of
loading
the
key
with the
weight.
(Threshold voltage
level adjustment.)
5)
Next,
put
a
1,500
gram
weight
on
the front
of
the
high
weight
key
and
adjust
VR2
so
that the
output
voltage
crosses the +3.5V
line within 2
to 8
seconds of
loading
the
key
with
the weight.
(Buffer
amp
gain adjustment.)