Roland SH-3A Service Note page 26

7.
ABJUSTT^ENT
7-1-
Preparation (Operation
Check:
and Preadjustment)
(l)
Position
the
control and switches as follows
VCO
8'
10
VGP CUTOFF FBSQ
10^
YCA HOLD 10
TRANSPOSE
M
Optimum Audio
Phones Level
Output Level
(2)
If
any note does not come
out, adjust VR258(VCA CUTOFF) and YR254
(VCF FREQ.) so
that the note
is
audible.
7-2.
VCO
TUNING
(1)
Connect
a
frequency counter
to the
71st terminal on OP-IOB.
(2)
Set the PITCH on the control panel at 0 position, and TUNING and
WIDTH on the rear
panel
to the
center position.
(3)
Depress
the PI
key and tune its frequency
to
174-6lHs by VR102.
(4)
Depress
the
P4
key and tune its frequency
to
1396.9Hz by VRIOI.
(5)
Repeat steps
(3)
and
(4)«
(6)
Check the
frequency of
the
F2(349*23Hz) and the P3( 698
.
46 Hz)
.
(
7
)
Check the following (effects)
a)
PORTAMENTO ON/OPP
b)
GLIDE Button and GLIDE PEDAL
c)
PITCH, TUNING and WIDTH
7-3*
VGA Adjustment
(1)
Adjust
the
HOLD control
to
set the
87
th terrainal(
OP-lOB) voltage
at
1
volt.
(
2
)
Connect
the
oscilloscope
to
the
91st (OP-lOB).
Set all the
waveform selector switches at
ru
position
and VCO
controls
to
maximum position.
(
3
)
Adjust VR258
(
cutoff) so
as to get the no output
waveform
on the
scope
.
(
4
)
Turn
the
HOLD fullclockwise.
(
5
)
Lower
the
VCOfU knobs except
8
'
to
minimum position, and confirm
the
output level of 2Vp-p. If not,
adjust VR258 within
the
condi-
tion of
step(
3
)
•
7-4.
CLICK BIAS adjustment
(
1
)
Setting
VCO
.....all 0
HOLD
_
10
VGA ENVELOPE
J
L
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