NAD VISO 1, Service Manual

Page: 11 / 71

11
BLOCK DIAGRAM
MC
U
PIC24F
J256G
B
106
A
U
DI
O
C
O
DEC
V
S
1053B
SP
I
34P
I2S SP
I
DI
G
A
U
D REC
E
IV
ER
A
K
4117
OP
T
20P
M
U
LT
IP
LEX
E
R
S
N
74L
V
C
257
I2S
BT
M
O
D
U
LE
B
T
M
511
SP
I
U
A
R
T
I2S
I2S
A
PPLE
I
C
M
FI341S
2164
I2C
2P
P
W
R DO
W
N
4P
IR
20P
KE
Y
LED
US
B
S
W
IT
CH
FS
U
S
B
3
0
D+
/D-
D+
/D-
D+
/D-
2P
VB
US
MC
U
34P
MO
D
U
LA
T
O
R
Z
X
CZ
M
800
FEEDB
A
C
K
P
R
O
C
ESSO
R
Z
X
CZ
A
200
SP
I
I2S I2S
FB
1/
2/
3
R
E
F 1/
2/
3
SU
B
L/C
H
R/
C
H
FB
1
FB
2
FB
3
PW
M
PW
M
PW
M
2P
DDF
A
C
O
NT
R
O
LLER
+
25V
PS
U
2P
+
25V
P
O
W
E
R DO
W
N
DET
E
C
T
UCC28600 FL
Y
B
A
C
K
TR
A
N
S
FO
R
M
E
R
L N
BR
ID
G
E
+
MO
S
FE
T
S
T
P16N
K
60Z
-
OP
T
O-C
OU
P
LE
R
CN
Y
1
7
FB
2P
AD
J R
E
G
T
L431
O/
P
VOL
T
A
G
E
S
E
N
S
E
4P
IR
B
D
20P
16P
C
O
NN#2
6P
KE
Y
D+
/D-
Y/
P
B
/P
R
2P
KE
Y
C
O
NN#1
6P
20P
20P
KE
Y
B
O
A
D
20P
I/
O
B
D
Y/
P
B
/P
R
4P
LED
Y/
P
B
/P
R
U
S
B
O
P
T
4P
LED
B
D
iP
od
B
D
14P
Y/
P
B
/P
R
D+
/D-
iP
o
d
Con
n
ST
EP
-D
O
W
N
CO
N
V
E
R
T
E
R
A
P
5004
VB
US
LD
O
R
E
G.
3.
3V
/
1.
8V
30P
2P
2P
2P
VB
US
VB
US
LED OP
T
D+
/D-
SERVICE ADVISORY
Do not power on or test amplifier section without
a load connected
. For example, one should check
all speakers and speaker connections for open
conditions before applying power.