Read Sharp LC-37AD1E (serv.man10) Service Manual online
58
58-1
58-2
LC-37AD1E
Ë
VHICXA2069Q-1 (ASSY:IC1301)
S2 correspondence 7 input 3 output AV switch
»
Block Diagram
»
Pin Function
Pin No
.
Pin Name
I/O
Pin Function
63
TV
I
Video signal input
1
V
1
I
Composite video signal input
8V
2
I
15
V3
I
22
V4
I
30
V5
I
60
V6
I
3
Y
1
I
Luminance signal is inputted with a Y/C separation signal input terminal.
10
Y2
I
YIN1 inputs the signal which carried out Y/C separation of the output of VOUT1.
17
Y3
I
24
Y4
I
49
YIN1
I
5
C
1
I
Chrominance signal is inputted with the input terminal of Y/C separation signal.
12
C2
I
CIN1 inputs the signal which carried out Y/C separation of the output of VOUT1.
19
C3
I
26
C4
I
51
CIN1
I
62,2
LTV,LV1
I
Input terminal of an audio signal
9,16
LV2,LV3
I
23,29
LV4,LV5
I
59,64
LV6,RTV
I
4,11
RV1,RV2
I
18,25
RV3,RV4
I
31,61
RV5,RV6
I
53
VOUT1
O
Composite video signal is outputted with the output terminal of a video signal.
41
VOUT3
O
44
V/YOUT2
O
Composite video signal output or a luminance signal output is chosen with the
output terminal of a video signal in I2C Bus control.
56
YOUT1
O
Luminance signal is outputted with the output terminal of a video signal.
39
YOUT3
O
58
COUT1
O
Chrominance signal is inputted with the output terminal of a video signal.
47
COUT2
O
37
COUT3
O
52
LOUT1
O
Audio signal output terminal
43
LOUT2
O
38
LOUT3
O
54
ROUT1
O
45
ROUT2
O
40
ROUT3
O
6
S2-1
I
Terminal on which C-signal was overlapped and which detects DC of S2
13
S2-2
I
correspondence.
20
S2-3
I
Less than 1.3V and they are 4:3 picture signals.
27
S2-4
I
More than 1.3V and less than 2.5V, and is a 4:3 letter box signal.
More than 2.5V and is the squeeze signal of 16:9 pictures.
GND at 100K
Ω
pull-down Since it is carrying out, it becomes 4:3 picture signals
at the time of opening.
7
S-1
I
Terminal for a change of composite video/S.
14
S-2
I
D
etection result is written in a status register.
21
S-3
I
Less than 3.5V and is S-signal. More than 3.5V and is a composite video signal.
28
S-4
I
Since the pull-up is carried out to 5V by resistance of 100K
É
, it becomes a
composite video signal at the open.
32
ADR
I
I2C Choose the slave address for Bus.
Less than 1.5V and is 90H. More than 2.5V and is 92H. Set to 90H at the time
of terminal opening.
33
SCL
I
Signal input terminal for I2C Bus.
34
SDA
I
Signal input terminal for I2C Bus.
36
DC OUT
O
D
C of the S2 correspondence superimposed on COUT3 output is outputted.
DC is superimposed by connecting with COUT3 output through capacity. Control
by I
2
CBus.
When external resistance 4.7Kohm is attached, output impedance 10±3K
Ω
of
S2 standard is realized.
55
TRAP1
I
Trap circuit for subcarriers is connected.
46
TRAP2
I
48
MUTE
I
Mute terminal for audio signal output
Less than 1.3V and is the mute off.
More than 2.5V and is the mute on.
50
BIAS
I
Terminal for internal reference bias (Vcc/2).
Connects with GND through a capacitor.
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