Korg POLYSIX Service Manual

it
9)
Confirm
that
difference
between
4'
D
4
and
E4 is
within 2
cents.
(Switch between
POLY
and
UNISON
and
check unit
0
only.)
10)
Switch
SW1 to
the
front while playing
C6
(stretch
tuning)
and
confirm
+8
~
+12
cent.
11)
Confirm
difference
of
no more
than
2
cents between
4'
G5 and
G
#
5.
Unit
0
only
is OK.
12)
Confirm that
KLM-366'S
VR1 is
approximately in
the
center
position
and
not turned in the clockwise or
counterclockwise
directions.
(8)
EG
TIME
check
and adjustment.
1)
Attack time
adjustment.
Check
CN05-12
with DVM
and adjust ATTACK VR
to
obtain +0.9V
±20mV. Set SUSTAIN to
0;
leave
others
at
normal
setting.
2)
Test top side
of
R143 10K with oscilloscope.
(Set
sweep
mode to
normal.)
3)
Set ARPEGGIO
to ON,
ARPEGGIO SPEED to
2.5,
LATCH to ON,
and UNISON to
ON.
4.
Play
any single
key and adjust
VR12 to
obtain an
attack time
of
250msec ilOmsec.
See fig.
5.
5)
Repeat steps
2)
~
4)
for units
0
~
5.
6)
Set
ATTACK to
10;
leave others at
setting
1
).
Repeatedly
play a
single key
and
confirm that
dif-
ferences
between the
fade-out
of
the
six
notes
are
within
5
seconds
and that
all
fade
out
within 15
~
25
seconds.
7)
DECAY TIME
check.
Set OCTAVE
to
4', WAVEFORM to
PW,
PW/PWM to
10,
CUTOFF
to
2,
RESONANCE to
10,
EG
INTEN-
SITY to
+3,
DECAY
to8,
SUSTAIN
toO,
ARPEGGIO
to
ON, ARPEGGIO SPEED
to 1
~
3.
LATCH to
ON,
and
KEY
ASSIGN
MODE
to
POLY.
Leave
others
at
normal.
Listen
to
each unit and check
to
see
that
there are
no
deviations.
8)
RELEASE
TIME
check.
Set DECAY to
0,
SUSTAIN
to
10,
and
RELEASE
to
8;
leave others at
same as
7)
above.
Listen
to
each
unit and
check to
see
that there are
no
deviations.
5. KLM-368
check
and adjustment.
(1)
HEADPHONE
AMP OFFSET
adjustment.
1)
Use
normal
setting. Connect
oscilloscope
and DVM
to
TP-4 (GND
is
TP-6).
Adjust VR6 to
obtain
offset
of OmV ±20mV.
(2)
HEADPHONE
AMP LEVEL
adjustment.
Set
OCTAVE to
4';
leave others
at
normal. Check
point
is same as
(1)
above.
1
)
Play
C3
and adjust
VR5
to
obtain a sawtooth
waveform
amplitude
of
0.3Vp-p (±5%).
2)
Check to
be sure
there
is
no
waveform distortion at
this
point.
(3)
OUTPUT
AMP
OFFSET
adjustment.
Set
WAVEFORM to
PW,
PW/PWM
to
10,
MG
FRE-
QUENCY
to
7,
LEVEL
to
10,
and MOD to
VCA.
Check SIG OUT
(TP-5)
with oscilloscope.
1)
Adjust VR7 to
minimize waveform amplitude. See
fig.
6.
Less
than
0.2
Vo-P
Fig.
6
(4)
OUTPUT
AMP
LEVEL
adjustment.
Set OCTAVE to
4';
leave
others
at
normal.
1)
Play
C3
and
adjust
VR8 to
obtain
a
sawtooth
wave-
form amplitude
of 3Vp-p (±5%).
2)
Confirm
that
click
noise
occuring
when
power is
turned
off is less
than volume
of sound
made
by
playing
C3.
DC
click noise
amplitude
should
be no
greater than 6Vp-p.
(5)
BBD
CLOCK
adjustment.
Set
EFFECTS
MODE to
ENSEMBLE,
SPEED/INTEN-
SITY to 10.
Leave others at
normal.
1)
Check TP-1
with
oscilloscope.
2)
Adjust
VR1 to
obtain
maximum
clock cycle
of
30Msec.
See
fig.
7.
25
-
30 M«ec
"1
T
5
’
1
Fig.
7
3)
Check TP-2
with
oscilloscope.
4)
Adjust VR2
to
obtain
maximum
clock cycle
of
30fisec.
5)
Check TP-3
with
oscilloscope.
6)
Adjust VR3 to
obtain
maximum
clock
cycle
of
30
At
sec.

Korg POLYSIX Specifications

General

Type	Analog
Polyphony	6 voices
Oscillators	1 VCO per voice
Effects	Chorus, Phaser, Ensemble
Keyboard	61 keys
Memory	32 patches
Year Released	1981
Waveforms	Sawtooth, Pulse
Filter	24dB/octave Low Pass Filter
LFO	Triangle