NAD T 751 Service Manual page 35

KEY BOARD
U202: EEPROM 24C02
A0 1
A1 2
A2 3
VSS 4
TUNER BOARD
U901: LA1837
30 29
ALC
AM
OSC
BUFF
COMP
FM
S-METER S-CURVE
FM
AM IF
DET
1 2
VCC
VSS
8 VCC
7 WP
6 SCL
SDA
5 SDA
WP
SCL
A0
A1
A2
28 27 26 25
REG
AM AM
MIX RF.AMP
AGC
AM IF DET
SD
AM
S-METER
AM/FM
IF-BUFF
TUNING
DRIVE
GND
3 4 5 6
DOUT
ACK
WORD ADDRESS
BUFFERS
START/STOP
LOGIC
CONTROL
LOGIC
STATE COUNTERS
SLAVE
ADDRESS
COMPARATORS
24 23 22 21 20
3 rd 5 th
DECODER
ANTI-BIRIDE
P-DET
STEREO
Ø
SW
VCO FF
304kHz 38k
STEREO
DRIVE
V
CC
7 8 9 10 11
45
SENSE AMPS
SHIFT REGISTERS
COLUMN
DECODERS
XDEC 2
E PROM
DATA IN STORAGE
HIGH VOLTAGE/
TIMING CONTROL
19 18 17 16
MUTE
FF FF PILOT
19k 19k DET
12 13 14 15