NAD T742, Service Manual

Page: 36 / 65

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
VCC A0 8 1
WP A1 7 2
SCL A2 6 3
SDA VSS 5 4
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
1 OUT4 42 DVDD
2 OUT3 41 CLK
3 OUT2 40 DATA
4 OUT1 39 LATCH
5 AVDD 38 DGND
6 SWin 37 AGND
7 GNDS 36 SWout
8 SRin 35 SRout
9 SLin 34 SLout
10 GNDC 33 Cout
11 Cin 32 Rout
12 GNDR 31 Lout
13 Rin 30 AVSS
14 GNDL 29 CL1
15 Lin 28 CL2
16 BYPASSR 27 CR1
17 BYPASSL 26 CR2
18 LTRE 25 RTRE
19 LBASS3 24 RBASS3
20 LBASS2 23 RBASS2
21 LBASS1 22 RBASS1
OUT-
PUT
PORT
MCU
I/F
volume
volume
volume
volume
volume
volume
tone tone
MULTI-CHANNEL BOARD
U605: M6244FP