NAD M3 Service Manual page 30

5. FRONT PANEL BOARD
S811 S814 S817
2listen 1standby
3recorde
S812 S815 S818
6biamp 5mode 4mono
S816 S819
8volume 7speaker
U87 +5V C824
1 8
A0 Vdd
2 7
A1 WP
3 6 0.1uF
A2 SCL
4 5
Vss SDA
DIP8
U83 +5V
1 16
/EN /FCOFF
2 15
C1+ VCC
C828 3 14
V+ GND
C831
0.1U 4 13
0.1U
C1- DOUT
5 12
C829 C2+ FCON
6 11
0.1U C2- DIN
7 10
V- /INV
8 9
RIN ROUT
C827 C830
0.1U 0.1U MAX3221
R841
0R
TXD1
TXD
R842
RXD
0R
RXD1
SPK A
SPK B
STBY
ZERO L
ZERO R
1N 1N 1N 1N 1N
U810
M3 VFD
+5V NAD M3
CZ81
1
2
3
4
CON4
R839 +5V
1
2 VD1
3 VD2
4 VD3
5 VD4
6 VD5
7 VD6
8 VD7
+5V 9 VD8
10K X 8
ENCODER_A 19
P1.0/T2
ENCODER_B 21
P1.1/T2EX
54
P2.0/A8
55
P2.1/A9
56
P2.2/A10
58
P2.3/A11
59
P2.4/A12 89C51RD68
61
P2.5/A13
64
P2.6/A14
65
P2.7/A15
49
XTAL1
48
XTAL2
51
VSS
C825 C826
20P X81 20P
11.0592MHz
R840 R838
10KX8 10K X 8
+5V +5V
100uF/25V +5V
C813
C816
0.1U
IR OUT
CZ82
TO PSU_SCH CZ72
+5V
C815 C821
0.1u 0.1U
+5V
R828
10K
30
RESET
2
EA
67
PSEN
68
ALE/PROG
34 RXD
P3.0/RXD
39 TXD
P3.1/TXD
40 IR V
U86 P3.2/INT0
41 IR S
P3.3/INT1
42
P3.4/T0
43 STBY
P3.5/T1
45 LEDA
P3.6/WR
47 LEDB
P3.7/RD
20 HCLK
P4.0
24 HDATA
P4.1
26
P4.2
+5V
R852
PROTECT
10k
R850 R853 Q89
10k 10k
2SC3326
R815
Q88
10k
R816
2SC3326
3k3
C810
1N/50V
R851
10k
FUNC
+5V
R848
10k
R846
R849 10k
10k
VOLA
Q87
2SC3326
R847
10k
+5V
R824 R831
10K 10K
U82 +5V
3
Q86 Vss
2
GND
2SA1015
1
Signal C814
C817
100uF/25V
R823 0.1U
HS0038B4
22
R826
10K
C812
R834
IR IN
10K
10N
S820
RESET
C832
R843
0.1U
10K
+5V
J81
1
2
CON2
RESET
R837 R844 R845
10K 10K 10K
U84C
U84D 10
12 8
11 9
Q81
13
DTA114
74LS00N
74LS00N
C811 +5V
U84B
0.1uF U84A 5
1 6
3 4
2
74LS00N
74LS00N
74LS00N U85D
12 U85C
11 9
13 8
10
74LS00N
+5V
U85A U85B
1 4
3 6
2 5
74LS00N 74LS00N
+5V
R825
Q85
2SC1815 2 C 2
10K
TEXT TEXT TEXT
1 3 B E 1 3
TCM810 2SC3326 DTA114EKA
1. GND 2SC1815
2. VDD 2SA1015
3. RESET
+5V
C823
0.1uF
U89
TCM810
+5V
+5V
Q82
DTA114
+5V
Q83
DTA114
R835 R833 R836
100 220 220
B O R D81
BL-BUBJFB52C4V-1
2
TEXT
1 3
DTC114EKA
1 2 3
HS0038B4
1. Signal
2. GND
3. VCC
3-16