3.2.11 Input/output circuit
Input/output circuit is also called AV board. AV board outputs video and audio signals sent from decode board and
power amplifier board from the corresponding terminal after coupling and filter circuit processing. Externally inputted audio
signal is sent to power amplifier board and decode board for processing also through AV board. DK1020S AV board video
output (refer to 3.2.10) circuit includes composite video output terminal, S-video terminal and component video output
terminal; audio circuit includes mixed left/right channel output terminal, digital and optical output terminal, coaxial cable
output terminal, SCART terminal, and also one path input terminal, that is left/right channel input terminal.
1. SCART terminal
SCART is a terminal that integrates video and audio together, which can transmit video and audio signals at the same
time and operation is very convenient. It has 21 pins in all and lies in the middle part at rear side of the player. Pin function
is shown as the following table:
- 46 -
Pin Name
Signal
direction
Function description Pin Name
Signal
direction
Function description
1 A(B)OUT I
Audio right
channel input
12 NC
Network
communication
data line 2
2 A(B)IN O
Audio right
channel output
13 RETURN Pr signal ground
3 A(A)OUT I
Audio left
channel input
14 RETURN
Blanking
signal ground
4 A-COM Audio signal ground 15 RED I/O I/O Pr signal I/O interface
5 RETURN Pb signal ground 16 BLK I/O I/O
Blanking signal
I/O interface
6 A(A)IN O
Audio left
channel output
17 RETURN
Blanking
signal ground
7 BLUE I/O I/O Pb signal I/O interface 18 TRTURN
Composite
video signal ground
8 FUNCSW I
Function
selection interface
19 V-OUT I
Composite
video signal input
9 RETURN Y1 signal ground 20 V-IN O
Composite
video signal output
10 CONT I/O
Network
communication
data line 2
21 GND Common
11 GREEN I/O I/O Y1 signal I/O interface
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