LG FLATRON MC-991A Manual De Uso página 37

SECCI Ó N VIF
SECCI Ó N VIF
FLUJO DE SEÑALES ( SECAM-L/L')
AM FM
5V
R115
Adjacent channel Adjacent channel
sound trap
sound trap
R114
Q103 Z106
u-COM(24)
40.4MHz Q105
OTHERS L'
9
33V
10
IF2
L104
7
5V
1uH
11
IF1
6
SDA
1
AGC
5
SCL
C141
4
2.2u
from MICOM
TUNER
IIC
• Tabla de lógica de conmutación del FILTRO SAW de IF
Sistema V-SAW S-SAW PIN3
B/G,D/K,I/I K3953M K9350M H(5V)
(±,²) (¬,-)
L9454 -
L K3953M L(0 V)
(10,11)
L9454 ¬
L' L(0 V)
• Tabla de modulación de IF para cada SISTEMA
SYSTEM VIF(MOD.) SIF(MOD.)
B/G 33.4M(FM)
I/I 38.9M(Negativa) 32.9M(FM)
D/K 32.4M(FM)
L 38.9M(Positiva) 32.4M(AM)
L' 33.9M(Positiva) 40.4M(AM)
Departamento T cnico
é
u-
COM(25)
u-COM(24)
OTHERS L'
R112
C111
R111
C109
R108
SIF signal
R109
R119
5V
R116
C108
47u
Q150
Q109
PIN15 PIN 16
H(5V) H(5V)
L(0V) H(5 V)
VIF signal
L(0 V) L(0 V)
L'-SW=L
B/G,D/K,I/I
Asc Z106
mode
40.4/41.4M ON
40.9M ON
FM/AM SW=H
40.4M ON
(Standard SW)
40.4M ON
32.4M OFF
5V
R113 L L ' ' (33.9MHz) (33.9MHz) VR102
VCO Adjust VCO Adjust
Q106
R123
C138
R127
C112
R128 5V
R138
Z104
R136
R137
L9454
D110
R120
(L')
1
D111
2 (L) C120
3
4
C139 L/L'SIF signal
5
R140
Q108
Q107
R139
C116
C114
2.2u
C221
0.1
B/G,D/K,I/I SIF signal
(VIF SW)
Q106=OFF 16pin=H
Q103=OFF Q105=ON
(SIF SW)
SIF SW 4 SIF1(1,2)
3pin=H
Q109=ON Q150=OFF
15PIN= H SIF MOD=FM
37
IC101 TDA4474A
R132
STD-SW
15
VIF-SEL
16
C117
14
IF VIDEO OUT
C115
3 12
SIF-SW VR101 VR101
AGC VR AGC VR
26
SIF-O(FM)
R126 C126
PLL LOOP
R117
20
AM-OUT
FILTER
27
C125
11 K3953M
30
VIF 2
SIF 2 5 4 3 2 1
29
10
Z102
7
VIF 1
5 4 3 2 1
TUNER
13 6 K3953M
Z101
AGC OUT
2
(B/G,D/K,I/I)
SIF 1
8 5 4 3 2 1
AGC
DECOUPLING
1
K9350M
C137
Z103
CVBS 4 PIN(14)
VIF SW4VIF1(6,7)
Z106=ON Trampa para la señal del
sonido adyac. (40,4MHz) act.
FM 4PIN(26)
SOUND SOUND
C108 = ON Velocidad alta del AGC
del sintonizador
(Capacitancia = 2,2uF)
LG Electronics España, S.A.
MC-991A
CVBS
OUT
C132 B/G,D/K/I
(FM SIF)
L109
L/L'
AM Sound
38.9M(L)
33.9M(L')
38.9MHz
(B/G,D/K,I/I)
PICTURE
PICTURE