Roland SYSTEM 100 101 Service Manual page 21

1976-7-30
SYSTEM 100-101
A440 Hz
Standard
OSC
Freq.
Adjustment:
a)
Set the Control Panel as
shown below, and produce the
sound
A
440 Hz.
vc
cu
FW
OFF
CUENCY
RE
SON
\HCt
—
VOLTAGE
Controlled
F tLTER
-m
1
r\ r
~n
—
J KY
C
30
f
fcOSfl
INITIAL
CAIN
VOLTAGE
CONTROLLED
AMPLIFIER
D—
i
LOW
OUTPUT
>l
STANOAHO
OSCILLAJOH
A-440HZ
Off
*3
LEVEL
b)
Have
a
Tuning Fork of
A440
Hz
set along.
Then, adjust the
Master Coil L101 of the
440 Hz
OSC
Board (OP-30) for zero heat (unison)
with the tuning
fork.
c)
In this Coil
Adjustment, use
always
a
hexagonal core driver of
nonmagnetic type.
O
Master
O
Coil
o
o
I
V
Tuning
fork
A-440Hz
STANDARD
OSCILLATOR
BOARD
1976-7-30 SYSTEMlOO-lOl
LFO, Wave Form Adjustment:
a)
Connect the Oscilloscope to Terminal
"54"
of the
VCF-VCA
Board (OP-27), and adjust
VR301 (N\ wave
ADJ.)
so as to
have the
output wave
in a
form
of
Sawtooth.
Good Wrong
10V
0-
OSCILLOSCOPE
777-
o
o
o
o
ooooiooooooooooooooooo
0000000
(54)0
(Si
VCF.
VCA-BOARD
(OP-27)
O NNwave
AD
J
o
@
(VR301)
&
O
O
O
o
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®
®
O
O
O
O
O