Roland SH-1 Service Notes page 14

ADJUSIMENT
JUL
20 1978 SH-1
4.
VCO
When adjusting
VCO,
be sure to continue to depress
respective
key.
RANG-E
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TP
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linearity
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VR305
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VCOH-3-1
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rp
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For the adjustment that follows, use a completely tuned electronic instrument
or a
tuning meter. Adjustment can
be made either by checking
for the beat sound
or
by
consulting the Lissajous figure on the oscilloscope.
4. a.
WIDTH ADJUSTMENT
1)
Set controls on the control panel
as shown above.
2)
Tune FI
to
pitch with TUNING control on the control panel.
(if this tuning
is
difficult only with TUNING
control, adjust VR312 FREQ
control, too.)
3)
Tune F2
to
pitch with VR313 WIDTH control.
4)
Again,
tune
FI to
pitch with TUNING control,
5)
Check
to see to
which
F2
is
out of
tune, to
higher pitch
or to lower pitch.
6)
Turn
Vld3
WIDTH control
to
mal^:e
the margin
of mistune still bigger.
(If F2
is
broadly
out of tune, turn
V11313 largely.
If F2
is
slightly out
of tune,
turn VR313 only slightly.)
7)
Tune FI to pitch over again.
8)
Repeat steps
5
thru
7
until both FI and F2 are tuned
to
pitch roughly.
9)
Tune
F3 to pitch with VR313 WIDTH control.
10)
Tune FI
to
pitch with TUNING control.
11
)
Check
to see to which
F3 is out of tune,
to
higher pitch
or to lower pitch.
12)
Turn VU313 WIDTH control
to
make the margin
of mistune still bigger.
(If F3 is broadly
out
of tune,
turn VR313 largely.
If F3
is
slightly out
of tune,
turn VR313 only slightly.)
13)
Tune
FI to
pitch over again.
14)
Repeat
steps
11
thru
13
until FI and F3 are tuned correctly.
15)
Set TUNING control the control panel at CENTER position.
16)
Tune FI to pitch with VR312 FREQ control.
13
[^Roland