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OT - —
3 IF/RF ADJUSTMENT |
SWITCH
POSITION
TEST
STEP | STAGE
Power: On
Band Selector: FM
Volume Control: Maximum
Function Selector: Radio
Mode Selector: Stereo
1. Using a minus
driver, turn
the core of
T2 counter-
clockwise
before taking
it out of the
bobbin.
2. Adjust for
best "IF"
curve.
|
Adjust for best
""S'' curve.
3 |
Repeat steps 1 and 2 until no further improvement can
be made.
87.3 MHz | Lowest
Band
frequency
coverage
108.3 MHz. Highest
|
frequency
ees
10.7 MHz | High
frequency
| Detectio
Adjust for
maximal
output.
88 MHz
| 88 MHz
Repeat steps 4, 5 and
et
7 until no further improvement can
be made.
|
VCO FREQUENCY ADJUSTMENT
re
108 Me
400 Hz, 30%, FM modulated
(mono signal)
SIGNAL
GENERATOR
FREQUENCY
FM mono position —
FM stereo position
(unmodulated)
98 MHz at 60 dB | 98 MHz
Adjust for 38.00 kHz
+ 100 kHz.
®
«3 ©
[ ice
|
VR
©
1®
Tc8
Lio
1c2
[Ss
13
""? =
L6
i)
ICt
=
la
Oe
LOO,
LODO, emae
NEW,
|
he
ape
iL
| fi VRIO4 VRIOS VRIOG VRIO7
|
MAIN PWB
B cE E E E
Figure 24—7
ADJUSTMENT POINTS
Tcé6
©
BANO SELECTOR
SWITCH
—24—
10.7 MHz
FM sweep
Generator
Figure 24—2
IF CURVE
FM Signai
Generator
FM Singal
Generator
Oscilloscope
IC3
(1) Pin
IC1
0.01 uF
(1)Pin
Figure 24—1 FM IF
10.7 MHz
Figure 24—3 S CURVE
Electronic
Voltmeter
Rod Antenna
Dummy
(See Figure 24—6)
Figure 24—4
FM RF
1C3
Pin
Frequency
Rod Antenna
1000 PF
Counter
Dummy
(See Figure 24—6)
Figure 24—5 VCO FREQUENCY
To
Rod Antenna
To Chassis GND
:
R1 = 37.5 ohms
Z = 75 ohms ee
95 ohins
Ri = 50 ohms
Z=50 ohms <n
Beane.
Z: Output impedance of signal generator
Figure 24—6
FM DUMMY
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