JVC TH-A30 Service Manual page 27

BA7612F (VIC3) : Video signal switcher
1. Block diagram
IN1 1
MUTE
CTLA 2 6dB 75Ω
CTLB 3 LOGIC
IN2 4
TDA7440D (U2) : Audio processor
1. Terminal layout
RIN3
1 28
RIN2
2 27
RIN1
3 26
LIN1
4 25
LIN2
5 24
LIN3
6 23
LIN4
7 22
MUXO-L
8 21
IN(L)
9 20
MUXO-R
10 19
IN(R)
11 18
BIN(R)
12 17
BOUT(R)
13 16
BIN(L)
14 15
W29EE512 (DU5) : Flash memory
1. Pin layout
4 3 2 1 32 31 30
A7 5
A6 6
A5 7
A4 8
A3 9
A2 10
A1 11
A0 12
DQ0 13
14 15 16 17 18 19 20
2. Truth table
CTL A
8 V
OUT
L (OPEN)
7 V
CC
L (OPEN)
6 IN3 H
H
5 GND
2. Block diagram
4
LIN1
RIN4
100K
LOUT
5
ROUT
LIN2
AGND
100K
VS
6
LIN3
CREF
100K
SDA
7
SCL
LIN4
DGND
100K
TRE(R)
3
TRE(L)
RIN1
PS1
100K
LP
2
RIN2
BOUT(L)
100K
1
RIN3
100K
28
RIN4
100K
2. Block diagram
V
DD
Vss
29 A14
28 A13
27 A8
CS
CONTROL
26 A9
OE
25 A11
WE
24 OE
23 A10
22 CE
21 DQ7
A0
DECODER
A15
CTL B OUT
L (OPEN) IN1
H IN2
L (OPEN) IN3
H MUTE
MUXO-L IN(L) TRE(L)
8 9
G VOLUME TREBLE
0/30dB
2
I CBUS DECODER + LATCHES
2dB STEP
G VOLUME TREBLE
INPUT MULTIPLEXER
+ GAIN
10 11
MUXO-R IN(R)
3. Pin function
DQ0
OUTPUT
BUFFER
DQ7
CORE
ARRY
BOUT(L)
BIN(L)
18 14 15
R
B
SPKR ATT
BASS
LEFT
SPKR ATT
BASS
RIGHT
V
REF
SUPPLY
R
B
19 12 13 23
TRE(R) BIN(R) BOUT(R) CREF
Symbol Function
A0~A15 Address input
DQ0~DQ7 Data I/O
CE Chip enable
OE Output enable
WE Write enable
Vcc Power
GND Ground
NC No connect
TH-A30
27
LOUT
21
SCL
22
SDA
20
DGND
26
ROUT
24
VS
25
AGND
1-27