NAD T 751 - AC3 and Audio Board IC Block Diagrams; 74 HCU04, 74 HC00, TC9273 N-004, 4066 Block Diagrams; Digital and Load Board IC Block Diagrams

42
AC3 BOARD
U118-U119: 74HC00
AC3 BOARD
U114: 74HCU04
AUDIO BOARD
U301: TC9273N-004
AUDIO BOARD
U302: 4066
DIGITAL
BOARD
U761: 74HCT00
LOAD BOARD
U701: NJM4558D
11A 14 VAC
21Y 13 6A
32A 12 6Y
42Y 11 5A
53A 10 5Y
63Y 94A
7GND 84Y
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
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)
IN/OUT 1
OUT/IN 1
OUT/IN 2
IN/OUT 2
CONT 2
CONT 3
1
2
3
4
5
6
7GND
VDD
CONT 1
CONT
4
IN/OUT
OUT/IN
OUT/IN
IN/OUT
14
13
12
11
10
9
8
11A
21B
31Y
42A
52B
62Y
7GND
14 V
CC
13 4B
12 4A
11 4Y
10 3B
93A
3Y8
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
+ – – +