NAD T 741 - AC3 Board U114: 74 HCU04 Block Diagram; AC3 Board U118, U119: 74 HC00 Block Diagram; Audio Board U301: HCF4053 BT Block Diagram

46
11A 14 VAC
21Y 13 6A
32A 12 6Y
42Y 11 5A
53A 10 5Y
63Y 94A
7GND 84Y
AC3 BOARD
U114: 74HCU04
1Y
1B
2Y
0B
3Y
1C
4Z
C
5Z
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
AUDIO BOARD
U301: HCF4053BT
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
AC3 BOARD
U118, U119: 74HC00