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1.MCU VM1.0
12
XM100
HOLE
C162
22N
R282
100R
GND
XM101
HOLE
C163 22N
R283 100R
GND
3V3S
C
13
8
22
u/
6v
3
C139
100N
GND
MCLR/VPP/RE3
1
RA0/AN0/C12IN0-
2
RA1/AN1/C12IN1-
3
RA2
4
RA3
5
RA4
6
RA5/HLVDIN
7
VSS
8
OSC1/CLKIN/RA7
9
OSC2/CLKOUT/RA6
10
RC0
11
RC1
12
RC2
13
RC3/SCK/SCL
14
RC4/SDI/SDA
15
RC5/SDO
16
RC6/TX/CK
17
RC7/RX/DT
18
VSS
19
VDD
20
RB0/INT0/FLT0/AN12
21
RB1/INT1
22
RB2/INT2
23
RB3/AN9
24
RB4/KBI0
25
RB5/KBI1/PGM
26
RB6//KBI2/PGC
27
RB7/KBI3/PGD
28
U105
PIC18F26K20
GND
C137
NC
R216
22k
R208
10k
R210
180k
GND
VHP1
C133
100N
D119
3V6
3V3S
GND
GND
R
220
100R
PG D A TA
PG CLK
MCLR
RXD
TXD
GND
3V3S
1
2
3
4
P109
Header 4
R268
100R R269
100R
C152
100n
L103
FB
GND
C147
100N
GND
RXD
TXD
MCLR
3V3S
GND
PGCLK
PGDATA
1
2
3
4
5
CON103
ICSP
R
222
100R
R219
100R
R225
100R
R228
100R
R231
100R
R235
100R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
P100 TO AMP board A
VPPi
VPNi
SCL
SDA
R126
0R
R123
0R
R128
0R
R130
0R
GPOa0
R133
0R
GND
VDR-
VDR+
+17.5V
-17.5V
R131
0R
R135
0R
AudioS
5V
S
VCLIP0
b
e
c
Q105
DTC114EKA
D124
ss12
G
1
O
U
T
2
IN
3
O
4
U108
ASM1117-3.3
C155
100n
C
15
8
10
0
n
5VS
3V3S
C
15
1
22
u
/6
V
3
3V3S
GND
L102
742792662
C159
10n
GND
R121
0R
GND
C101
10N
C102
10N
GND
GND
R119
0R
R120
0R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
P101
TO AMP board A
VPPi
VPNi
SCL
SDA
R169
0R
R168
0R
R170
0R
R172
0R
GPOa1
R177
0R
GPOb1
GND
VDR-
VDR+
+17.5V
-17.5V
R174
0R
GPI1
R178
0R
AudioS
5VS
VCLIP1
R165
3K9
GND
C108
10N
C109
10N
GND
GND
R158
0R
R161
0R
D112
4V7
D113
4V7
GND
GND
D114
4V7
GND
D105
4V7
D106
4V7
GND
GND
D107
4V7
GND
1
2
3
4
5
6
P105
From PSU
VDR-
VDR+
VPP
VPNi
GND
GND
PS_EN
VAUX+
VAUX-
nFATAL
OVL
nAMPON
AMPOFF
O V L
nA M PO N
1
2
3
4
8
7
6
5
FB100
100M/600R
R
229 100R
R
232 100R
R
233
100R
R
223
100R
STBY
Q 131
D TA 114
R186
100
3V 3S
C124
100N
C
12
9
10
0N
C
12
2
10
0N
C
13
2
10
0N
R240
0R
R244
0R
SDA
SCL
R201
1k
R
2
0
2
0
R
GND
VAUXa
C125
100N
D118
3V6
GND
R185
10
K
VAUXa
3V3S
GND
R139
10
0R
C107
2N2
R141
100R
R1
44
2.
5m
R
R173
22
K
R179
22
K
D110
15V
R1
80
7K
5
GND
C115
10n
R164
47K
C114
1U
2
3
1
U102A
TL084
6
5
7
U102B
TL084
C112
470N
R152
330K
R153
330K
GND
R151
10K
R167
10K
GND
Q117
2SA1312
13
12
14
U102C
TL084
R163
12K
R1
76
1K
GND
R136
200R
R137
200R
VCLIP0
VCLIP1
9
10
8
U102D
TL084
VPPi
VPNi
VPNi
VPP
GND
GND
4
11
U102E
TL084
-17.5V
+17.5V
C116
2N2
C117
2N2
GND
2
3
1
U100A
LM324
6
5
7
U100B
LM324
13
12
14
U100C
LM324
9
10
8
U100D
LM324
R101
47K
R100
1K
R112
5K6
R113
5K6
Q104
2SA1312
5VA
R122
5K1
GND
R111
100K
R1
15
15
K
R1
25
15
K
R129
100K
GND
5VS
R114
10R
C103
10U
GND
5VA
R116
100K
R1
27
10
0K
C105
10U
GND
5VA
R1
17
10
0K
GND
AudioS
5VA
4
11
U100E
LM324
GND
1
1
2
2
C104
100N
R124
100R
A udioSa
D 123
4V 7
C 143
100N
G N D
POWER_ON
A-LED
R245
100R
AUDIO SENSE
CLIPPING CONTROL
R203
180k
VHP1
D E B U G
TRI GIN
R285
47KJ
TRI GON_OFF
a1
1
gnd
2
a2
3
y2
4
vcc
5
y1
6
U109
NC7WZ17
3V3S
C164
100n
R289
120R
GND
R286
120R
R290
10R
GND
A
M
P
M
O
D
U
L
E
1
A
M
P
M
O
D
U
L
E
2
C113
10U/35V
C
12
6
22
0U
C
12
7
22
0U
C
12
8
22
0U
C
13
0
22
0U
C
13
1
22
0U
C
12
3
22
0U
C156
470U/6V3
D135
ISS352
D137
ISS352
D134
ISS352
D136
ISS352
D111
ISS352
D101
ISS352
D104
ISS352
D109
ISS352
1
2
3
4
5
6
7
8
9
10
P103
FROM PSU
GND
VPPi
VPNi
GND
VPPi
VPNi
0 6 - 1 0 0 2 1 - 0 6
VPPi
1
1
3
3
2
2
JP100
JP101
JP102
H eat sin k
HS1
XM102
HOLE
C166
22N
R291
100R
GND
D140
ISS352
D139
ISS352
XM103
HOLE
C167
22N
R292
100R
GND
D141
ISS352
D142
ISS352
G
PI0
G
POb0
+17.5V
-17.5V
+17.5V
-17.5V
GND
GND
GND
GPI1
3V3D
TR
IG
IN
TR
IG
O
N
_O
FF
R
29
6
10
k
R
29
7
10
k
GPI0
3V3D
R
10
7
10
K
R
10
8
10
K
Rt
RT1
NTC
Q120
FMMT593TA
R
32
6
12
0K
R
32
8
4K
3
1
2
3
D154
BAV99
GND
VPPi
R327
120K
R
32
9
10
K
D155
3V6
C173
100N
1 2 3 4 5 6 7 8
CON106
5VS
GND
R309
10K
R214
10K
NM OS I
q1
1
q2
2
q3
3
q4
4
q5
5
q6
6
q7
7
gnd
8
q'h
9
/sclr
10
sck
11
rck
12
/g
13
ser
14
q0
15
vcc
16
U104
74HC595
GND
C136
100N
GND
3V3D
3V3D
NCK0
R209B 100R
R209D 100R
R209C 100R
R209A 100R
R213B 100R
R213C 100R
R213D 100R
R213A 100R
3V3S
GND
C140
100N
NCS1
R226
100R
GPOa0
GPOb0
GPOa1
GPOb1
R241
10k
R239
10K
Q135
DTC114E
K
A
GND
G
D
S
Q132
APM2313
3V3S
3V3D
C146
1N
GND
GND
5VEN
L101
742792662
C
17
4
22
u/
6v
3
PWM-LED
W/R-LED
XM104
HOLE
C168
22N
R293
100R
GND
D146
ISS352
D147
ISS352
D158
4v7
GND
1
2
3
P112
FROM STB
GND
5VS
STB_EN
Q118
2SC3324
R1
6
0
47
K
1
1
3
3
2
2
R171
10K
R1
75
5K
1
GND
R3
25
33
K
1
2
3
4
P111
TO MAIN
R
3
3
1
1
0
K
R
3
3
0
1
0
K
3
2
4
1
Q113
BCV62B
-17.5V
D159
4v7
D160
4v7
R319
1K5
Q123
C2690
Q121
BC846B
Q122
BC846B
R323
0.47
R
33
6
47
0
R
34
1
3K
9
R
33
2
22
k
R333
22k
R
33
9
68
0
R338
680
D168
16V
GND
+17.5V
VAUX+
Q125
BC856B
Q126
BC856B
Q124
A1220
R324
0
.
47
R
33
7
47
0
R
34
2
3K
9
R340
680
R
33
4
22
k
R335
22k
GND
-17.5V
VAUX-
GND
GND
C183
10U
C182
1U
C180
10U
C177
10U
C181
1U
1
2
3
D162 BAV99
1
2
3
D163 BAV99
W
/R
-L
E
D
A
-L
E
D
P
W
M
-L
E
D
3V3D
GND
C184
10U
GND
GND
GND
i d l i n g 0 V
D169
16V
R346
68
0
C
1
78
47P
R348
680
R
34
9
10
K
D170
15V
R347
680
C
179
47P
TP1
C100
0.22u/ 16v
D166
CD4148WP
D167
CD4148WP
trig in
C165
100N
R287
10KJ
R288
6k
8
D138
4v7
232 gnd
5
1
4
2
3
J101A 17- 02001-55
R284
470R
232 gnd
1
PB1
1
PB2
2
1
SW1
SW(TOUCH)
1
2
3
4
P110
TO MAIN
Whi t e l ed br i ght ness ADJ
CIRCUIT DIAGRAM
Summary of Contents for M22
Page 1: ...NAD SERVICE MANUAL M22 STEREO AMPLIFIER M22 STEREO AMPLIFIER...
Page 6: ...6...
Page 25: ...PCB LAYOUT 1 MCU VM1 0 BOARD Top Layer Bottom Layer 25...
Page 26: ...2 2 AMP VM1 0 BOARD Top Layer Bottom Layer...
Page 27: ...2 3 NC400 OEM VM1 0 BOARD Bottom Layer Top Layer...
Page 29: ...5 SMPS VM1 0 BOARD Bottom Layer Top Layer...
Page 30: ...3 6 SMPS STB VM1 0 BOARD Bottom Layer Top Layer...