Haier HT-3768 Service Manual page 17

47
COLOR DECODE PLL
48
GND
49
+9V 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
NC
60
TUNE VOLTAGE
61
AV CHOICE CONTROL
62
HORIZONTAL SYNCHRONIZATION
SIGNAL
63
REMOTE CONTROL INPUT
64
SLEEP CONTROL
2. 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
frequency signal will be released at the IF 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 the sound
surface wave filters Z101 of this appliance according to system properties.
Intermediate frequency signals will be transmitted to (41) and (42) of
N204(TMP8803SN). The mixed signals of picture video signals and secondary
sound intermediate frequency signals output from (31) of N204, After sound
carrier frequency is trapped by the trap filter, intermediate frequency signals are
amplified and PLL image decoded, The AGC time constant is dependent on
C205 (0.22u) connected to (39) of N204 (TMP8803SN),.
3.Analysis of sound power amplifying circuits
Sound power amplifying circuits are composed of integrated circuitsTDA2611 and
peripheral components. TDA2611 is an integrated electrical circuit . Information
introducing functions and testing data for TDA2611 maintenance is listed in Table 4. T
if a cylindrical color card is installed then a fluke III digital multimeter is used.
2.5
0
8.7
2.9
2.9
3.1
0
0
5.1
0
0
0
0.1
4.4
0.2
4.5
5
3.6
17
0 5000
100 0
750 100
750 1100
750 1100
0 1100
0 0
400 0
600 4500
600 7500
600 12500
600 12500
600 12500
600 10000
600 10000
600 12500
600 12500
600 8000
and intermediate
Z