Korg Mono/Poly - Adjustment Procedure

8.
ADJUSTMENT PROCEDURE
Caution: This
unit has
been
precisely
adjusted at the factory
before
shipment. Therefore, absolutely
do
not
turn any
variable
resistors other
than
those
required for servicing.
Furthermore, please
allow
thirty
minutes
of warm-up
time after
turning on
the
power before beginning
check or
adjustment.
Please refer to the
separate
VR location
chart.
Cs
Normal
setting
1.
POWER
SUPPLY
adjustment (KLM-376).
Connect
DVM to
KLM-356;
GND is J12.
1)
-15V:
Check J11
with
DVM and
confirm -15V
(±0.01V).
Adjust
KLM-376
VR-3 if necessary.
2)
+15V:
Check J40
with DVM
and
confirm +15V
(±0.5V).
3)
+5V:
Check left
side of R54
(J39) with
DVM and
confirm
+5V
(±0.02V). Adjust
KLM-376
VR-2 if
necessary.
2. KEY
ASSIGNER
adjustment
(KLM-356).
1
)
Assignor slope.
CV1
output:
Short
the TUNE
POINT; connect
DVM to
right side
of KLM-356
R8 (GND is J12);
change
TRANSPOSE
SW
position in the
order UP
-*
DOWN
-»
NORMAL
and adjust to
obtain the
values
shown in the
chart.
TRANSPOSE
VR
CV1
UP
HI ADJVR-1 +10.583 ±1mV
DOWN LOW ADJ VR-2
+0.000 ±1mV
NORMAL MIDADJVR-3 +5.250
±1mV
2)
Open
the
TUNE
POINT
and
confirm
keyboard
CV
as
shown.
KEY
TRANSPOSE
CV
Absolute
value
±10mV
Slope
±2mV/Oct.
C2
DOWN
1.000V
C2
NORMAL
2.000V
C3
NORMAL
3.000V
C4
NORMAL
4.000V
C5
NORMAL
5.000V
C5 UP
6.000V
3.
PITCH
adjustment (stretch tuning)
(KLM-354).
1)
OFFSET adjustment
Check
KLM-398 lead wire connection
points with
DVM and
confirm
that each
VCO offset
voltage
is
±0.1mV.
Adjust the KLM-398
VR if necessary..
Color code:
VCO 1
—
Red
VCO 2
—
Yellow
VCO
3
+
Blue
VCO
4-*
Gray
2)
VCO-1
adjustment
Settings:
VC01 LEVEL
10
VC02-4
LEVEL
MASTER
TUNE
center
TRANSPOSE
NORMAL
DETUNE
WHEEL BEND,
MG
.
VCF
Connect properly
calibrated
WT-12
to
SIG
OUT or
PHONE OUT and adjust as
follows.
Set WT-12 to
METER
function and set
chromatic
dial to A
#
.
WT-12
OCTAVE
VCO-1
OCTAVE
KEY
Meter
Indication
(cents
f
VR
M(L)
16'
A*4
VR102
LL
16'
A*,
-7
(-5~-
10)
VR103
M(L)
2'
A*,
VR101
HH
2'
A#
4
+7(+5~+10) VR104
The
2'
A
#
3
and A
#
4
pitch
indications
should
ideally
be
+4 cent and
+7
cent,
respectively.
20