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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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