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US-SOS
AO
MOTHER BOARD
OPH-28
(149H028)
SEP.10 1978
D,7
RC-855
(ISOjuH)
(181 K)
SVC-303
Connectors
Js
5028-04
A
Ji,J2,J4,J7
5028-06A
J3
5028-07A
Jfi
5028-08A
FREQUENCY COUNTER
I
768HZI
B
Q
liiiiiiim
«x™irriTmm.
Qqi
TG-H09
TUNING
The
Master
VCO
should be retuned
after:
1.
Secondary
voltage
varies
(modification or
repairing
around
the
power
supply).
2.
Components
in
the
VCO
are replaced.
When
soldered,
allow
them
to
dissipate
heat for
several
minutes.
Set
Knobs and
Switch
as
shown.
Adjust
VR-1
(OPH-28)
for
1768Hz
at
"A"
Tone
Divider.
RELEASE PULSE
FREQUENCY ADJUSTMENT
Place a closed plug
or DP-1
in
SUSTAIN
jack
on
the
rear panel.
Adjust
VR-2
(OPH-28)
for:
ISjiSEC
OSCILLOSCOPE
27pSEC
0P-H28
IC6
/^-^^
/
^
1
TP.02X
CD
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