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TUNER
ADJUSTMENT
"Tl
oe
SG
frequency
Position
of tuning
dial
Oscil!,
cope
with no unrequired
Signal.
Step
Connect oscilloscope
to test point TP3, TPS
Connect sweep
generator to FM
aerial
Terminal
10.7
MHz
(non
modulation)
1304
—
Low end of dial scale | L106
MAX.
High end of dial scale
| VCT-2
MAX.
Connect
oscilloscope
Ratio
Det.
87 MHz (400 Hz
30%
:nodulation)
1093 MHz
(400 Hz
30%
modulation)
30 MHz (400 Hz
30%
modulation)
106 MHz (400 Hz
30%
modulation)
Connect
FM
SG.
to
FM
aerial Terminals.
Connect VTVM
to
speaker terminal.
90 MHz
on dial scale
| L104
Connect VTVM
to
speaker terminal.
Connect
FM
SG.
to
AERIAL
EM serial Terminals.
106 MHz
on
dial
scale | VCT-1
©
o2)
O
7
Repeat adjustments.
PREPARE:
1. Variable Capacitors completely closed.
2. Set the dial pointer to very left line of dial scale.
3. Connect sweep
generator,
FM SG, VTVM
and oscilloscope.
FM antenna
input impedance
ts 75 ohm.
4. Use a screwdriver with
plastic grip for all adjustments.
Se
SW1 ADJUSTMENT
(M2422H) —
.
Connections
Adjusting
ae
;
:
,
VTVM
Circuit
SG frequency
Position of tuning dial
Adjustment
Oscilloscope
:
Low end of dial scale.
30% modulation)
Connect AM SG. .
Connect
VTVM
to
to aerial terminal
EXT.
SP. terminals
through {RE dummy.
ices
ws
7.6 MHz (400 Hz
isc-nd er dial
ceal
.
30% modulation)
Se
ee
eer gene?
2.5 MHz
(400 Hz
:
Connect
AM SG.
30% modulation)
2.5 MHz on dial scale.
a
:
Connect
VTVM
to
AERIAL
to aerial terminal
EXT.
SP terminals
through IRE dummy.
6.5 MHz (400 Hz
6.5 MHz on dial
scal
30% modulation)
:
On
Gta! scare.
Repeat adjustments.
PREPARE:
1.
Variable capacitor completely closed.
4.
Use a screwdriver with plastic glip for all adjustments.
2.
Set the dial pointer to very left line of dial scale.
5.
Selector switch to "SW1"
3.
Connect signal generator to dummy
aerial.
;
VTVM
5
MAX.
1
SW2
ADJUSTMENT
(M2422H)
Connections
Adjusting
Circuit
Position of tuning dial
Output
Connect AM SG.
to aerial terminal
through IRE dummy.
Tea
PE
set,
PREPARE:
1.
Variable capacitor completely closed.
-
4.
Use a screwdriver with plastic glip for all adjustments.
2.
Set the dial pointer to very teft line of dial scale.
5.
Selector switch to ''SW2"',
3. Connect signal generator to dummy aerial.
Connect
VTVM
to
EXT. SP. terminale
Connect AM SG.
to aerial terminal
through
IRE
dummy.
Connect
VTVM
to
EXT. SP. Terminals.
21 MHz (400 Hz}
30% modulation)
Repeat adjustments.
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