Korg DW-6000 - OSC2 VCA Level Check; Resonance Level and fo Check; fc Slope Check; Noise Level Check

4.
0SC2
(oscillator
2)
VCA level
check and
adjustment.
1)
Connect
an oscilloscope
to the KLM-655
test point
(ground
goes
to
C6 GND
side).
2)
Select
program number
12.
3)
Play
key
C3
and
confirm
a
waveform
level
of 0.5V
p-p
(±20mV
p-p) (Same as
fig-2).
4)
Check all
six
voices
in the same
way.
5)
If
a
voice
does
not
meet
the level
specification,
adjust
it
by
turning
its LEVEL
2 VCA adjustment
VR:
No.
4,
9, 14,
19,
24,
or
29.
5.
Resonance
level
check
and
adjustment.
(A)
1)
Connect
an
oscilloscope
to the
KLM-655
test point
(ground
goes
to
C6
GND
side).
2)
Select
program
number
13.
3)
Play
any
key
and
confirm
a waveform level
of
0.5V
p-p
(±40mV
p-p)
(fig-3).
7. Noise
level check and adjustment.
1)
Connect
an
oscilloscope to
the
KLM-655
test point
(ground goes
to
C6
GND side).
2)
Select program
number
16.
3)
Play
any
single
key
and
confirm
that 80%
of
the
wave-
form
level
is
0.2V~0.4V
p-p.
(fig-4)
Fig-4
0.5V
±
40mV
4)
Check
all
six
voices in the
same way.
5)
If a voice
does
not meet the level specification, adjust
it
by turning
its resonance adjustment
(RESO ADJ) VR:
No.
3, 8,
13,
18,
23,
or
28.
4)
Adjust
VR1
if
necessary.
8.
6BD
input
distortion
check and
adjustment.
1)
Connect
a
signal
generator
to
KLM-711
connector CN-
14B-1
and
input a 1
kHz sine
wave at a
level of 6V p-p.
2)
Connect
an
oscilloscope
to
the
KLM-711 IC5
3-pin and
confirm that
there is
no
distortion
in
the
observed wave-
form.
3)
If
there
is
distortion
in the
observable
waveform, elimi-
nate
it
by
adjusting
VR1
.
(B)
fo check
and adjustment.
1)
Connect
an
oscilloscope to the
KLM-655
test
point
(ground
goes
to
C6 GND side).
2)
Select
program
number
13.
3)
Connect
a
tuner to
the
output
jack.
4)
Play
any
single
key and confirm
a
tuner
reading of
0
cent
(±10
cents)
deviation
for
that pitch
at
"C".
5)
Check
all
six
voices
in
the same
way. If a voice
does
not
meet
specification,
adjust its
fo
adjustment VR: No.
5,
10,
15,
20,25,
or
30.
6.
fc
slope
check
and
adjustment.
1)
Connect
an
oscilloscope
to
the
KLM-655 test
point
(ground goes
to
C6
GND
side).
2)
Select
program
number
14.
3)
Connect
a
tuner
to
the
output jack.
4)
Play
any
single
key
and confirm
a
tuner reading
of
0
cent
(±10
cents)
deviation
for that pitch
at
"C'\
5)
Check
all
six
voices
in
the
same way.
If
a
voice
does
not
meet
specification,
adjust
its
fc
adjustment VR: No.
6,
11,
16,21,
26, or
31.
-
31
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