NAD T 175, Service Manual, Page: 39 / 102

39
KEYBOARD
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V D2 2 0 1
V F D-1 6 -B T-1 3 0 G IN K
R 2 2 0 1
1 k
R 2 2 0 2
4 .7 k
R 2 2 0 3
2 .2 k
E
C
B
Q 2 2 0 1
2 S D1 9 1 8
R 2 2 0 4
3 3 k
R 2 2 0 5
4 7 0
R 2 2 0 9 4 7 0
R 2 2 0 7
1 0 k
D2 2 0 3
6 .2 V
1 /2 W C 2 2 0 1
0 .1 U
R 2 2 0 6
2 2 1 /4 W
R 2 2 0 8
2 2 1 /4 W
C 2 2 0 2
0 .1 U
1
A
2
B
3
C
M 2 2 0 1
E C 1 6 2 1 0 2 F 2 B -H A 1 -0 0 2
C 2 2 0 3
0 .1 U
C 2 2 0 4
0 .1 U
R 2 2 3 0
1 0 k R 2 2 3 1
1 0 k
C 2 2 0 5
1 0 0 p
C 2 2 0 6
1 0 0 p
R 2 2 3 2 1 0 0
R 2 2 3 3 1 0 0
R 2 2 3 4
2 .2 k R 2 2 3 5
2 .2 k R 2 2 3 6
2 .2 k
1
V O U T
2
G N D
3
V C C
D2 2 0 2
F M -6 0 3 8 TM 2 -5 A N
C 2 2 0 7
0 .1 U
C 2 2 0 8
1 u
5 0 V
R 2 2 1 0
1 0
1 2
S 2 2 1 6
TO N E C O N TR O LS
D2 2 0 9
LL4 1 4 8
D2 2 0 8
LL4 1 4 8
D2 2 0 7
LL4 1 4 8
D2 2 0 6
LL4 1 4 8
D2 2 0 5
LL4 1 4 8
R 2 2 1 6
1 0 k
R 2 2 1 5
1 0 k
R 2 2 1 4
1 0 k
R 2 2 1 3
1 0 k
1 2
S 2 2 0 4
M E M O R Y
1 2
S 2 2 0 3
IN F O
1 2
S 2 2 0 2
TU N E R M O DE
1 2
S 2 2 0 1
A M /F M /DB
1 2
S 2 2 0 8
R IG H T
1 2
S 2 2 0 7
DO W N
1 2
S 2 2 0 6
LE F T
1 2
S 2 2 0 5
U P
1 2
S 2 2 1 8
F R O N T IN PU T/M P
1 2
S 2 2 1 7
TO N E DE F E A T
1 2
S 2 2 1 0
E N TE R
1 2
S 2 2 0 9
PO W E R O N
1 2
S 2 2 1 4
S O U R C E DO W N
1 2
S 2 2 1 3
S O U R C E U P
1 2
S 2 2 1 2
S PK B
N .I. for T1 7 5
1 2
S 2 2 1 1
S PK A
N .I. for T1 7 5
1 2
S 2 2 1 5
LIS TE N IN G M O DE
1
S TR O B E
2
DA TA
3
C LO C K
4
Q 1
5
Q 2
6
Q 3
7
Q 4
8
V S S
9
Q S
1 0
Q S
1 1
Q 8
1 2
Q 7
1 3
Q 6
1 4
Q 5
1 5
O /P_ E N A B LE
1 6
V DD
U 2 2 0 1
H E F 4 0 9 4 B T
C 2 2 1 0
0 .1 U
C 2 2 1 1
4 7 u
1 6 V
R 2 2 1 1
2 .2 k
C 2 2 1 2
4 7 0 0 p C 2 2 0 9
N .I.
5 0 V
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
J2 0 0 2 B
To M C U J2 0 0 2 A
R 2 2 1 2
1 0 k
D2 2 0 4
LL4 1 4 8
E
C
B
Q 2 2 0 2
DTA 1 1 4 E K A
R 2 2 3 7
1 k R 2 2 3 8
1 k
E
C
B
Q 2 2 0 3
DTA 1 1 4 E K A
R 2 2 3 9
1 k
E
C
B
Q 2 2 0 4
DTA 1 1 4 E K A
1
R
2
O
C
C
4
B
D2 2 0 1
B L-B U B JF B 5 2 C 4 V -1
E
C
B
Q 2 2 0 6
DTA 1 1 4 E K A
R 2 2 4 1
2 .2 k
E
C
B
Q 2 2 0 5
DTA 1 1 4 E K A
R 2 2 4 0
2 .2 k
DG N D
DG N D
+ 3 9 V
V
F
D_
DA
T
A
VFD
_
C
L
K
VFD
_
C
S
VFD
_
R
ST
+5
V
_
K
DG
N
D
DG
N
D
DG
N
D
+ 3 9 V
VH
DG N D DG N D DG N D
+ 5 V _ K + 5 V _ K
DG N D DG N D
DG N D
+ 5 V _ K
DG N D DG N D
+ 5 V _ K
DG N D
+ 5 V _ K
DG N D
DG N D
+ 3 9 V
A
C
4.
8V
1
A
C
4.
8V
2
+ 5 V _ K
DG N D
VFD
_
C
S
+ 5 V _ K
DG N D
EN02 EN01 4094_S
T
B
KEY
_00
KEY
_02
KEY
01
KEY
_03
IR
_
F
A
C
4.
8V
2
A
C
4.
8V
1
+
39V
+ 5 V _ K
DG N D
VFD
_
R
ST
+ 5 V _ K
R E D
O R A N G E
B LU E
DG N D
DG N D
+ 5 V _ K
DG N D
+ 5 V _ K
4094_CL
K
4094_D
A
T
A
DG
N
D
+5
V
_
K