32
29.
DECS.DEM
2.4
5.9M
3.6M
30.
GND2
0
0
0
31.
SND.PLL
2.4 6.3M
4.7M
32.
AVL
0
6.2M
3.8M
33.
H.OUT
0.6
21K
21K
34.
F.B.L.SO
0.3
6.4M
4.4M
35.
AUO.EXT
0
0
0
36.
EHTO
1.7
21.8K
22K
37.
PLL.IF
2.4
6.4M
4.6M
38.
IF.VO/SVO
3.3
4.3M
4.6M
39.
VP1
7.8
18K
18K
40.
CVPS.INT
3.9
5.4M
4.1M
41.
GND1
0
0
0
42.
CVBS/Y
3.3
6.2M
4.0M
43.
CHROMA
1.5
83K
83K
44.
AUD.OUT
3.4
6.4M
4.8M
45.
INSS.W2 BL
2.1 0.86K
0.86K
46.
R2/V.IN
2.5
6.3M
4.5M
47.
G2/Y.IN
2.5
6.3M
4.5M
48.
B2/U.IN
2.5
6.3M
4.5M
49.
BCL.IN
1.5
216K
239K
50.
BLK.IN
4.9
28K
28K
51.
R.OUT
2.8
7.46K
7.5K
52.
G.OUT
2.8
7.48K
7.5K
53.
B.OUT
2.9
7.5K
7.5K
54.
VDD.A
3.3
32K
26K
55.
VPE
0
0
0
56.
VDD.C
3.3
32K
26.5K
57.
OSC.GND
0
14
13
58.
XTAL.IN
1.8
3.0M
2.7M
59.
XTAL.OUT
1.7
0.5M
0.54M
60.
RESET
0
0
0
61.
VDDP
3.4
32K
26.6K
62.
AV1/AV2
5.1
15K
15K
63.
AV/SVHS
5.1
15K
15K
64.
INT.REM
5.0
41K
40.6K
2.3 Analysis of common passage circuits
Having been received by antenna or fed by cable TV into the antenna input terminal of HF tuner
TU101 TECC7949 , HF TV signals pass through tuning for station selection, HF amplification and
frequency mixing inside the HF tuner and then, a 38MHz IF picture signal and 31.5MHz IF sound
signal will be transmitted from the IF terminal of TU 101 and be fed directly into (1) of the pre-IF
amplification thick-film circuit N101 (M9911A), where the signals will be amplified to compensate for
the insertion loss of the sound surface filter.
The sound surface filter SF101 K6264K adopts single-terminal or double-terminal input according to
different system choices. The single-terminal or double-terminal input are controlled by the (6) of
N201 via V101 BC548C : D/K, B/G and I signals will be input in a single channel and M signals in
double channels. The sound surface filter K6264K is a wide range filter for single channel input,
suitable for D/K, B/G and I sound signal; and is a narrow range filter for double-channel input,
Circuit Explanation
