NAD C 525BEE, Service Manual

Page: 22 / 40

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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
MAIN BOARD
U403: TC74HC00AP
V0
GND
V1
MAIN BOARD
U503: UPC79M12HF
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
+ – – +
MAIN BOARD
U305, U306: NE5532
OUT
IN
GND
MAIN BOARD
U501, U502, U504,
U506, U507: 78XX