NAD T 741 - Multi-Channel Board U604: TC9164 AN Block Diagram; Multi-Channel Board ICs Block Diagram; Tuner Board U901: LA1837 Block Diagram

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