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1.2.7 KA7630
2
Electric circuit analyses
2.1 Super single chip integrated circuit TDA9373
As a super large-scale decoding and microprocessing integrated circuit, TDA9373 is comprised of a
microprocessor, picture image intermediate frequency amplification, sound intermediate frequency
amplification, line and field scanning, dwarf signal processing, color decoding, sound filtering and
auto identification, luminance separation, high voltage tracking and over voltage protection. It
2
functions for I
C bus-mastering and automatic adjustment for transmeridional correction and dark
balance.
Table 1 lists the pin function and test data of TDA9373 as the reference for maintenance.
The data is to be tested under the mode of 49.75MHz, PAL B/G and cylindrical color card muting,
using a model FLUKE 79
Table 1
Pin
1.
STANDBY
2.
SCL
3.
SDA
4.
VT
5.
KEY
6.
SYSTEM
7.
MUTE
8.
GND.MAG
9.
VSS C/P
10.
BAND
11.
BAND
12.
VSSA
13.
SEC.PLL
14.
VP2
15.
DECD/G
16.
PH2.LF
17.
PH1.LF
18.
GND3
19.
DEC.BG
20.
EWD
21.
V.DRB
22.
V.BRA
23.
IF.IN1
24.
IF.IN2
25.
I.REF
26.
V.S.C.
27.
TUNER.AGC
28.
AU.DEEM
Secondary power integrated circuit
instrument.
Function
Resistance to Ground
Working
Forward Test
voltage V
0
36K
3.5
15K
3.2
15K
3.0
20K
3.4
36K
4.4
15K
5.1
15K
0
Infinity
0
0
3.3
14.5K
0
14.5K
0
0
2.3
6.4M
7.8
18K
5.0
31.9K
2.9
6.4M
3.9
6.4M
0
0
4.0
39.8K
0.7
63K
2.4
6.0M
2.4
6.0M
1.9
37.5K
1.9
37.5K
3.85
38.8K
3.8
6.3M
1.7
4.9K
3.2
6.1M
31
Circuit Explanation
R
Back Test
29K
15K
15K
20K
30K
15K
15K
2.9M
0
14K
14K
0
4.3M
18K
32K
4.2M
4.2M
0
40K
63K
4.0M
4.0M
38K
38K
38.8K
4.6M
4.9K
3.6M
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