Haier HT-3768, Руководство по обслуживанию

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47
COLOR DECODE PLL
2.5 0 5000
48
GND
0
100 0
49
+9V VCC
8.7 750 100
50
RED SIGNAL OUTPUT
2.9 750 1100
51
GREEN SIGNAL OUTPUT
2.9 750 1100
52
BLUE SIGNAL OUTPUT
3.1 0 1100
53
TV SIMULATE GND
0 0 0
54
GND
0 400 0
55
+5V VCC
5.1 600 4500
56
MUTE
0 600 7500
57
I
2
C SERIAL BUS DATA LINE 0
0 600 12500
58
I
2
C SERIAL BUS COLOCK LINE 0
0 600 12500
59
NC
0.1 600 12500
60
TUNE VOLTAGE
4.4 600 10000
61
AV CHOICE CONTROL
0.2 600 10000
62 HORIZONTAL SYNCHRONIZATION
SIGNAL 4.5 600 12500
63
REMOTE CONTROL INPUT
5 600 12500
64
SLEEP CONTROL
3.6 600 8000
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
Z
and intermediate
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.
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