Haier 21FA18-T Service Manual page 22

29
AUDIO OUTPUT 2
30
TV OUTPUT
31
SIF SIGNAL OUTPUT
32
EXTERIOR AUDIO 2
33
SIF SIGNAL INPUT AND LEVEL REVIS
34
DC FEEDBACK
35
PIF PLL
36
+5 IF VCC
37
S-REG
38
AUDIO MON
39
IF AGC
40
IF GND
41
IF INPUT
42
IF INPUT
43
RF AGC
44
BLACK DET
45
MONITOR OUTPUT
46
APC FIL
47
YV 5V
48
SYNC OUT
49
VCC
50
RED SIGNAL OUTPUT
51
GREEN SIGNAL OUTPUT
52
BLUE SIGNAL OUTPUT
53
TV SIMULATE GND
54
GND
55
+5V VCC
56
MUTE
2
57
I C SERIAL BUS DATA LINE 0
2
58
I C SERIAL BUS COLOCK LINE 0
59
SYSTEM
60
TUNE VOLTAGE
61
AV CHOICE CONTROL
62
HORIZONTAL SYNCHRONIZATION
SIGNAL
63
REMOTE CONTROL INPUT
64
POWER
1.Analysis of common path circuits
High frequency television signals, received via an antenna (or transmitted through a cable
TV system) to the input terminal of the high frequency tuner A101, are processed for
tuning and high frequency amplifying and mixing, then a 38.9MHz image intermediate
frequency and 34.4MH
terminal of Z101 to b of the transistor V101, where signals are amplified to compensate for
the insertion losses of the sound surface wave filter. Single or dual-ended input is used for
and intermediate frequency signal will be released at the IF
Z
8.8 100
3.6 700
1.8 700
4.3 750
2.9 750
2.2 750
2.4 500
5 750
2.1 750
4.4 700
1.7
0 650
0 650
0 750
3.5 500
5 600
1.9 650
1.8 750
5
100
1.8
3.3 750
2.9 750
2.9 750
3.1
0
0 400
5.1 600
0 600
0 600
0 600
0.1 600
4.4 600
0.2 600
4.5 600
5 600
3.6 600
20
100
950
2100
1400
5000
1400
1500
1100
4000
1400
0 5000
0
4500
4500
1400
1100
2200
5000
0 5000
0
100
1100
1100
0 1100
0 0
0
4500
7500
12500
12500
12500
10000
10000
12500
12500
8000