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FM IF/RF ADJUSTMENT
SWITCH
POSITION
SIGNAL
GENERATOR
DIAL
AD-
TEST
FRE
STEP
POINTER | JUST-
rer STAGE
| QUENCY
SETTING
FM mono
400 Hz, 40 kHz dev., FM modulated.
REMARKS
1. Using a minus
driver, turn
the core of
T202 coun-
terclockwise
before taking
it out of the
bobbin.
. Adjust for
best "IF''
curve,
10.7 MHzj|
High
frequency
T202
Adjust for best
"S" curve.
Repeat steps 1 and 2 until no further improvement
can be
made.
87.35
| Lowest
MHz
Band
frequency
coverage
Adjust for
maximal
output.
Highest
frequency}
TC103
Repeat steps 4 and 5 until no further improvement can be
made.
90 MHz
90 MHz
L103,
Tracking
le
Adiust sor
TC101,
maximal output.
TC102
Repeat steps 7 and 8 until no further improvement can
be made. .
VCO FREQUENCY
ADJUSTMENT
400 Hz, 40 kHz dev., FM modulated
SIGNAL
GENERATOR
{mono signal)
DIAL
FREQUENCY
| POINTER
SETTING
ADJUST-
MENT
REMARKS
FM stereo position (unmodulated)
Adjust for
19 kHz + 25 Hz.
98 MHz at
60 dB
CIRCUIT ADJUSTMENT (TUNER SECTION)
Dummy
See
fi
—
10.7 MHz
eae earn 20
Oscitlosope
FM Sweep Generator | FM External
Antenna
:
to
GND
TP104
Figure 22—1 FM IF
Figure 22-2 FM "IF'' CURVE
Figure 22-3 FM "S" CURVE
FM External
(See Figure 22-6.) Antenna
Dummy
FM
Signal
Generator
GND
_TP104
Figure 22—4 FM RF
FM External'
Antenna
FM Signal
Generator
Frequency
Counter
100 kohms
(See Figure 22-6)
Figure 22-5 VCO
R2
RI
R3
To Telescopic Rod Antenna
Z = 50 ohms
R1 = 50 ohms
R2 = 125 ohms
R3 = 150 ohms
Z= 75 ohms
R1 = 75 ohms
R2 = 112.5 ohms
R3 = 150 ohms
To Chassis GND
Z : Output impedance of signa! generator
Figure 22—6 FM DUMMY
—22—
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