Sharp GF-320H Serviceanleitung Seite 11
Inhaltsverzeichnis
AM
IF/RF ADJUSTMENT
400 Hz, 30%, AM modulated
SIGNAL
GENERATOR
FRE_
STEP
STAGE
QUENCY
POINTER
SETTING
MW
IF
IF
H: 455 kHz
High
E: 468 kHz
frequency
LW
RF
2
Band
145
kHz
Lowest
frequency
coverage
3
295
kHz
Highest
frequency
4
Repeat steps 2 and 3 until
made.
Tracking
5
170
kHz
170
270
kHz
270
7
Repeat steps 5 and 6 until no further improvement
made.
MW
RF
8
Band
510
kHz
Lowest
frequency
coverage
9
1 ,650 kHz
Highest
frequency
10
Repeat steps 8 and 9 until no further improvement can be
made.
11
Tracking
600 kHz
600 kHz
12
1,400
kHz
1,400
13
Repeat steps 1 1
and 12 until no further
made.
SW RF
14
Band
5.85
MHz
Lowest
frequency
coverage
15
18.5
MHz
Highest
frequency
16
Repeat steps 14 and 15 until no further improvement can be
made.
Tracking
6.5 MHz
6.5 MHz
17
18
16 MHz
16 MHz
19
Repeat steps 17 and 18 untj; no further improvement can be
made.
CIRCUIT
ADJUSTMENT
DIAL
JUST-
REMARKS
MENT
Adjust
for best
"IF"
curve.
Adjust
for
LIO
maximal
output.
no further
improvement
can
kHz
L 7
Adjust
for
maximal
kHz
TC5
output.
can be
L9
Adjust
for
maximal
output.
TC7
L7
Adjust
for
maximal
kHz
TC4
output.
improvement
can be
LB
Adjust
for
maximal
output.
TCE
Adjust
for
maxima;
TC3
output.
(TUNER
Sweep
Test
Generator
Loop
About
I O cm
Figure
Test
Signal
be
Dummy
(See Figure
AM Signal
Generator
R
c
Figure
VRI
Figure
G F-320
SECTION)
MW/LW
IC2
Bar
Antenna
Pin
Unit
GND
Figure
11—1
AM
IF
455
kHz or 468
kHz
11—2
AM
IF CURVE
External
MW/LW
Figure
11—3
LW/MW
RF
1 1 —5)
Externa
Telescopic
Speaker
Rod Antenna
Terminal
unit
4 ohms
GND
GND
Figure
11—4
SW RF
To telescopic
rod antenna
R
30 ohms
—50 ohms <
Z
C = 12 pF
Z: Output
impedance
of signal generator
To chassis
GND
11—5
SW DUMMY
MAIN
SWIOI
TC3
w
TC4
C
TC5
TC2
TC7
3
GND
IC3
I I —6
ADJUSTMENT
POINTS
Oscilloscope
Electron
Voltmer
Electror
I
V oltmet
o
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