NAD T 741 - Key Board U202: EEPROM 24 C02 Block Diagram; Main Board U701: NJM5532 M Block Diagram; Main Board U723: NJM78 M56 FA Block Diagram; Multi-Channel Board U605: M6244 FP Block Diagram

48
DOUT
ACK
WORD ADDRESS
BUFFERS
START/STOP
LOGIC
CONTROL
LOGIC
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
A0
A1
A2
SCL
WP
SDA
VSS
VCC
XDEC
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
E
2
PROM
COLUMN
DECODERS
SENSE AMPS
SHIFT REGISTERS
VCCA0 81
WPA1 72
SCLA2 63
SDAVSS 54
KEY BOARD
U202: EEPROM 24C02
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
U701: NJM5532M
1
INPUT
3
OUTPUT
2
GND
MAIN BOARD
U723: NJM78M56FA
1OUT4 42 DVDD
2OUT3 41 CLK
3OUT2 40 DATA
4OUT1 39 LATCH
5AVDD 38 DGND
6SWin 37 AGND
7GNDS 36 SWout
8SRin 35 SRout
9SLin 34 SLout
10GNDC 33 Cout
11Cin 32 Rout
12GNDR 31 Lout
13Rin 30 AVSS
14GNDL 29 CL1
15Lin 28 CL2
16BYPASSR 27 CR1
17BYPASSL 26 CR2
18LTRE 25 RTRE
19LBASS3 24 RBASS3
20LBASS2 23 RBASS2
21LBASS1 22 RBASS1
OUT-
PUT
PORT
MCU
I/F
volume
volume
volume
volume
volume
volume
tone tone
MULTI-CHANNEL BOARD
U605: M6244FP