Sharp VZ-1600H(S)

©
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
VY
As
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—