Kbd Track - Korg POLYSIX Service Manual

PARTS
NAME
SPECIFICATIONS
PART CODE
Q'TY
PCB RAIL
64608200
MODEL NUMBER
PLATE
KOC-C40144
64050500
1
KEY
BOARD
ESK-701 61
KEYS
42001900
1
NOTE
This
is
the modification
in circuit. Please
make
necessary
treatment
for
unmodified
sets.
(1)
Please
fix
yellow
KBD
wires to
KBD
chasis
with cord
keeper
in
order
to
keep the wires
away from
IC33 on
PC-Board KLM-367.
This
modification
prevents
wrong
operation of the
programmer.
(2)
Connect
the
GND
side
of the battery
on
P.C.
-board
KLM-367
to
GND
No. R2,
R3 and R4 on
P.C.
-board
KLM-370.
(3)
CONNECT
the
GND
of
PHONE
JACKS
to shield
sheet under
KLM-368.
(4)
Modifucation
to
improve
the higher frequency
re-
sponse has been
made on
KLM-368
in
order to im-
prove the tone quality
from
the
June
production.
The
circuit
diagram
in
this
manual
fits
for the modifi-
cation.
Constants for the old
production
are
as
follows:
R167
2.2KJ2
R166
1K£7
R197 10
K£2
C78
0.0047£i
R196 100
Kfl
(5)
The
circuit
diagram and the P-C
Board
for
KLM-366
have
been modified
from
the
June production.
Accordingly,
adjustment procedure for
KLM-366
has
been changed
as
follows:
1)
VCF
for
adjustment (Change
in
R58
and R64)
Turn
CUTOFF
from 0
to
10 and check
to see that
each
unit's oscillation
frequency
is
6.5~20 Hz
at
0 and
25~31 KHz
at 10.
Amplitude should be
at least
300mVp-p
throughout.
2)
KBD
TRACK
offset
adjustment
Same
setting
as
p21
(6)
Play Cl
and
turn the
KBD
TRACK
knob from
0
to 10.
Confirm
that the difference
between
these
two
pitches
is
within
20
cents.
If
not, adjust
VR-13.
3)
PITCH
check and adjustment
VR15
on
KLM-366
is
equal to
VR1
on KLM-396.
Confirm
that difference
between 4'
D#4
and
E4
is
within 2
cents.
If
necessary, adjust
VR14.
VR2
is
used to adjust for deviation
in
higher pitch
range totally for
all
the 6 units.
OUTPUT AND LEVEL
adjustment
Same
setting
as
P23
(4).
Play
C3 and
adjust
VR8
to obtain
a
sawtooth wave-
form, amplitude of 2.0Vp-p (±5%).
25