NAD T 741 Service Manual page 37

MULTI-CHANNEL BOARD
U604: TC9164AN
VSS
1
L-S1 2
L-S2 3
L-S3 4
L-S4 5
L-COM1 6
L-S5 7
L-S6 8
L-COM2 9
L-S7 10
L-S8 11
L-COM3 12
L-ST 13
SHIFT REGISTER
TUNER BOARD
U901: LA1837
30 29
ALC
AM
OSC
BUFF
SD
COMP
FM
S-METER S-CURVE
FM
AM IF
DET
1 2
GND VDD
14 28
28 27 26 25 24
REG
AM AM
MIX RF.AMP
AGC
AM IF DET
AM
S-METER
AM/FM
IF-BUFF
TUNING STEREO
DRIVE DRIVE
GND
3 4 5 6 7
MULTI-CHANNEL BOARD
U601, U602, U606, U607, U609: NJM5532
U603, U608: NJM4558D
U701-U703: NJM4558M
27 R-S1
AMPLIFIER 1
26 R-S2
OUTPUT
25 R-S3
INVERTING
INPUT
24 R-S4
NON-INVERTING
23 R-COM1
INPUT
22 R-S5
21 R-S6
20 R-COM2
19 R-S7
18 R-S8
17 R-COM3
16 DATA
15 CK
23 22 21 20 19
3 rd 5 th
DECODER
ANTI-BIRIDE
P-DET
STEREO
Ø
SW
VCO FF FF
304kHz 38k 19k
V
CC
8 9 10 11 12
49
8
1
2 7
– + + –
6
3
4 5
V –
18 17 16
MUTE
FF PILOT
19k DET
13 14 15
AMPLIFIER 2
V +
OUTPUT
INVERTING
INPUT
NON-INVERTING
INPUT