TUNER BOARD
TABLE OF CONTENTS
Tuner Adjustment Table .................................................................. 7-1
Circuit Diagram (/98 & /55 ver.) ...................................................... 7-2
PCB Layout (/98 & /55 ver.) ........................................................... 7-3
Electrical Parts List & Voltage List ................................................. 7-4
7-1
7-1
TUNER ADJUSTMENT TABLE
Waverange
Input frequency
Input
Tuned to
Adjust
Output
Scope/Voltmeter
VARICAP ALIGNMENT
AM IF
AM RF
3)
108MHz
87.5MHz
check
7.5V 1V
1.4V 0.2V
T002
FM
87.5 - 108MHz
(50kHz grid)
1602KHz
531KHz
T005
FM
612kHz
612kHz
1404kHz
T006
1404kHz
VC001
AM
1)
If sensitivity of frequency counter is too low adjust to max. channel separation
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)
2)
RC network serves for damping the IF-filter while
adjusting the other one.
3)
For AM RF adjustments the original frame antenna has to be used!
.
x
a
m
symmetric
f
o
.
x
a
m
symmetric
f
o
0
2
2
R
100nF
24
IC001
450kHz
Connect pin 6 of
IC001 (AM Osc.)
with short wire to
ground (pin 4)
AM AFC
MW
f = 15kHz
V
RF
= 3mV
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
MW
531-1602kHz
(9kHz grid)
FM - RF
7.2V 1V
108MHz
87.5MHz
MAX
mod=1kHz
f= 22.5kHz
106MHz
90.1MHz
MW
( 98/ 55/ 51 )
check
check
VC001
L001
MAX
MAX
T001
MAX
T003
V=mV
530-1700kHz
(10kHz grid)
1700KHz
531KHz
check
T005
1.1V 0.2V
7.2V 1V
1.1V 0.2V
1000kHz
600kHz
1000kHz
600kHz
T006
VC001
Содержание FWD573/55
Страница 15: ...2 2 2 2 ...
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Страница 20: ...4 1 4 1 BLOCK DIAGRAM Tuner system Control system ...
Страница 25: ...5 4 5 4 A B C D 1 2 3 4 5 CIRCUIT DIAGRAM CONTROL PCB BOTTOM LEFT ...
Страница 26: ...5 5 5 5 5 6 7 8 9 A B C D CIRCUIT DIAGRAM CONTROL PCB BOTTOM RIGHT ...
Страница 34: ...6 4 CIRCUIT DIAGRAM MAIN AMPLIFIER TOP LEFT 6 4 ...
Страница 35: ...CIRCUIT DIAGRAM MAIN AMPLIFIER TOP RIGHT 6 5 6 5 ...
Страница 36: ...6 6 6 6 CIRCUIT DIAGRAM MAIN AMPLIFIER BOTTOM LEFT ...
Страница 37: ...6 7 6 7 CIRCUIT DIAGRAM MAIN AMPLIFIER BOTTOM RIGHT ...
Страница 48: ...SET MECHANICAL EXPLODED VIEW 9 1 9 1 ...