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GX-1
(S/#
5030~
)
Adjustment Procedures
Preparation
Attach the 28-pin and 80-pin connectors,
then turn on the
power switch.
Note: Important:
Do not depress any key after turning on the
power
switch.
1.
IC power source voltage adjustment --VR14
Ascertain
that the -9V
terminals
(5, 19) do in fact have
-9+ 1V, then adjust the IC power source @) between the +V
(20) and —V (19) terminals for |15.0V| at VR14.
2.
Octave network and voltage follower adjustment
Note:
Set the tuning control at center.
S::(C, ~ Ci, SEW....< . SENN
os 4G VRQ
Adjust for 4.000V between pattern (D and E terminal.
a
ae
Oe KET)... .: 2.000V
ts ~ 8, KEY)... - 1.000V
2.—(C, ~B, KEY). =... «. 0.500V
A
ee.
os 5 O 250K s e ois. VR10
Adjust for 0.250V at pin 15 @ of 1C19.
3.
Voltage follower adjustment -- VR12
vril
Qe
°
®2kx3
VRIO
29.94K
x II
ul
°
;
oo =
Otho
tbo © |
20%
yon HO 201
3] fobs
} a Teste
Adjust VR11 so that 0.125V is present at pin 1 @ of IC17.
|
>
:
ono
lo || one
Fs
nd Bs
5.
Output voltage buffer adjustment --VR1 ~ 8
"
|
©
Seas
lz.) ost
a!
FETS
Adjust for 0.125V at the 80-pin connector ).
|
:
old
4%
TREO 93
1 pin
VR1
C40
FET?
°
re
CC
ti is
pine
|
0 )
op
d
«=>
neces
.
VR2
:
<—
a a
Roitooo
i
Set to 0.125V
=
2
=
oes
o
7
owe hoa.
FRR
4 es VR7
=
a
oO
oO
oO
o
oll
w y
©
|
=
a
oe
Ss
|
BBs
COSE,
Y
ns
ae
ts 5
és
=p
|
8
pin
=
ee
ee VR8
Z
!
=
le Ep
we:
2) |
6.
Portamento circuit adjustment - VR15
ots a
Ta
oF ced
55 e
23
-$|
Adjust portamento time change in relation to lever position.
oo
poe 8
S006
--i-
1 Vai Oe
J
j
=
ey deme
ee
/
a
ya as
/
iN.
Ah
J
/
O
4
7O
7
——
3 ae
oo
JS
O
ooog
8 6
on
0
0
0°
Oe
5
oe
edll
=
0000000900
°
O
|
ee
1) Socket
403
Oi:
$35.
DICA-40A-T1
1G: pin
C931602
12
ee
Es
C931402
2)
into
:spread to keepdry chemical
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