Sharp VZ-1550E(BK)

V Z-1550H/E
CP-1550E
€)
CIRCUIT
ADJUSTMENT
(TUNER
SECTION)
FM
1F/RF
ADJUSTMENT
Dummy
(See figure 22-6)
FM External
An
10.7 MHz Oscillosope
SWITCH
POSITION FM mono FM Sweep Generator
SIGNAL
GENERATOR
400 Hz, 40 kHz dev., FM modulated.
ene |, DIAL,| AD: Figure 22-1 FM IF
POINTER | JUST- REMARKS igure 22—
STAGE | QUENCY | ceTTING | MENT
1. Using a minus
driver, turn
the core of
T202 coun-
1 {F T101 terclockwise
before taking
10.7 MHz] High it out of the
frequency bobbin. . ease
2. Adjust for Figure 22—2 FM “IF” CURVE Figure 22-3 FM “S” CURVE
best “IF”
curve,
|
2 Detectio T202 Adjust for best FM External
1 “S" curve. FM Signal (See Figure 22-6,) Antenna
L to Generator Dummy
3 Repeat steps 1 and 2 until no further improvement can be
made.
T T S
4
87.1
Lowest
|
L103
GND
_TP104
Band MHz frequency A =
coverans Mid Figure 22—4 FM RF
5 109 Highest Adjust for
MHz frequency| TC102 | maximal output.
1 ; : : 5 eae FM Signal FM External
6 desi steps 4 and 5 until no further improvement can be Generator died eeeoe Woe canan Prequaney
7
Tracking Adjust for ieee
i e Figure 22-6) TP106
8 106 MHz | 106 MHz | TC101 | ™2%!mal output.
Figure 22—5 VCO
9 Repeat steps 7 and 8 until no further improvement can
be made.
VCO FREQUENCY ADJUSTMENT R2
SIGNAL 400 Hz, 40 kHz dev., FM modulated
GENERATOR (mono signa!)
R!
DIAL
POINTER
SETTING
FM mono position
98 MHz at i< MHz
ADJUST- REMARKS
FREQUENCY MENT
FM stereo position (unmodulated) R3
VR301 Adjust for .
|
19
kHz
+
25
Hz.
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 signal generator
60 dB
Figure 22-6 FM DUMMY
—22-—