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AM SECTION
Setting:
BAND selector switch:
MW or LW
AM rf signal
generator
Put the lead-wire
wr
antenna close to
the set.
Ce
30% amplitude
modulation by
400 Hz signal
e@Repeat
the
procedures
in
each
adjustment
several times, and the OSC voltage and tracking
adjustments
should
be
finally
done
by
the
trimmer capacitors.
@ Perform after LW TRACKING
ADJUSMENT.
| ST-7O7RM
ST-707RM
|
VTVM
-
fcee
+
MAIN BOARD
Ps
.
-
(CONDUCTOR sive)" we ass
Ly
MW
TRACKING
ADJUSTMENT
Adjust for a maximum reading
on VTVM.
LW TRACKING
ADJUSTMENT
Adjust for a maximum reading
on VTVM.
—-162kHz
270 kHz
MAIN BOARD
(COMPONENT
SIDE)
M
NN
©
®
ie]
©
©
©)
L023
CT022 L025
CT024
MW/LW OSC Voltage Adjustment
Procedure:
1.
Set BAND selector switch to MW.
for 8 — 8.5 V VOM (2) reading.
4.
Set BAND selector switch to LW.
for 8 — 8.5 V VOM (1) reading.
2.
Push TUNING
(+, -) button for 522 kHz. Ad-
just L023 for 1 — 1.1 V VOM (2) reading.
3.
Push the button for 1,611 kHz. Adjust CT022
vom @: Mw
VOM @®: LW
(DC range}
(DC range)
Push TUNING
(+, -) button for 144 kHz. Ad-
just LO25 for } — 1.1 V VOM (1) reading.
6.
Push the button
for 288 kHz. Adjust CT024
e
Oe
Ree e e e
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