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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:
F i g u r e
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-—
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