NAD T 761 - AC3, Audio, Load Board IC Block Diagrams

48
AC3 BOARD
U118-U119: 74HC00
A1
B1
Y1
A2
B2
Y2
GND
VCC
B4
A4
Y4
B3
A3
Y3
1
2
3
4
5
6
7
14
13
12
11
10
9
8
AUDIO BOARD
U301: TC9273N-004
2S1
1
V
SS
26
V
DD
27 S1
3S2 26 S2
4S3 25 S3
5S4 24 S4
6S5 23 S5
7S6 22 S6
8S7 21 S7
9S8 20 S8
10S9 19 S9
11S10 18 S10
12S11
13
GND
14
CK
15
DATA
16
RESISTER
17 S11
(L-ch)
10bit
Latch
Circuit
LEVEL SHIFT + SHIFT RESISTER
CIRCUIT
(R-ch)
10bit
Latch
Circuit
(Same
as L-ch
Circuit)
AUDIO BOARD / COMPONET VIDEO BOARD
U302, U901: HCF4053BT
1Y
1B
2Y
0B
3Y
1C
4Z
C
5Y
0C
6E
7V
EE
16 V
DD
15 Z
B
14 Z
A
13 Y
1A
12 Y
0A
11 S
A
10 S
B
8V
SS
9S
C
E
S
C
S
B
S
A
LEVEL
CONVERTER
Y
0C
Y
1C
Z
C
Y
0B
Y
1B
Z
B
Y
0A
Y
1A
Z
A
LOAD BOARD
U701: NJM4558D
AMPLIFIER 1
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
V –
AMPLIFIER 2
V +
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT
1
2
3
4
8
7
6
5
+ – – +