NAD T977 C/AH Service Manual - page 7
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
AGND
+62V
+62V
-62V
-62V
AGND
AGND
AGND
ISCTRIG
AC OFF
SEN
PROTECT
-68V
+68V
-18V
+18V
SC PNP
SC NPN
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
STBY
STBY
+
8V
+8V
P
R
OT4
P
R
OT3
P
R
OT5
P
R
OT2
P
R
OT6
P
R
OT1
P
R
OT7
D
G
ND
DGND
SCLED
SCLED
AG
ND
SE
N1
SE
N2
SE
N7
SE
N3
SE
N6
SE
N4
AG
ND
SE
N5
ISCTRIG_1
ISCTRIG_2
ISCTRIG_3
ISCTRIG_4
ISCTRIG_5
ISCTRIG_6
ISCTRIG_7
D
G
ND
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
SCN_4
SCP_4
+18V
-18V
+68V
-68V
PROT1
SEN1
ACOFF
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
STBY
+8V
DGND
SCLED
SCN_3
SCN_4
SCP_3
SCP_4
+62V_3
-62V_3
+62V_4
-62V_4
DGND
-18V
+18V
ACOFF
+70V
-70V
FAN3
FAN2
FAN1
DGND
FAN1
DGND
FAN2
DGND
DGND
FAN3
+12VD
PROT1
PROT2
PROT3
PROT4
PROT5
PROT6
PROT7
SCLED
DGND
+5VD
STBYLED
15V
15V
AGND1
64V
64V
38V
38V
AGND2
53V
53V
ON/OFF
STBY
DGND
-18V
+18V
ACOFF
+70V
-70V
FAN3
FAN2
FAN1
DGND
STBY
+8V
DGND
SCLED
SCN_3
SCN_4
SCP_3
SCP_4
+62V_3
-62V_3
+62V_4
-62V_4
PROT1
STBYLED
PROT3
+12VD
PROT2
PROT4
+5VD
PROT6
PROT5
SCLED
PROT7
DGND
ON/OFF
STBY
STBY
STBY
+
8V
+8V
P
R
OT4
P
R
OT3
P
R
OT5
P
R
OT2
P
R
OT6
P
R
OT1
P
R
OT7
D
G
ND
DGND
SCLED
SCLED
AG
ND
SE
N1
SE
N2
SE
N7
SE
N3
SE
N6
SE
N4
AG
ND
SE
N5
ISCTRIG_1
ISCTRIG_2
ISCTRIG_3
ISCTRIG_4
ISCTRIG_5
ISCTRIG_6
ISCTRIG_7
D
G
ND
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
+62V_4A
+62V_4A
-62V_4A
-62V_4A
AGND4A
AGND4A
AGND4A
ISCTRIG_1
+5VD
RELAY
DGND
AC SENS
T
O
P611B
T
O
P604B
T
O
P612B
T
O
P605B
T
O
P613B
T
O
P606B
T
O
P614B
T
O
P607B
T
O
P615B
T
O
P608B
T
O
P616B
T
O
P609B
T
O
P617B
T
O
P610B
STANDBY BOARD
MAIN TRANSFORMER
DISPLAY BOARD
THERMAL PROTECT BOARD
POWER SUPPLY BOARD
CONNECTION BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
POWERAMP MODULE BOARD
FROM P204B
FROM P205B
FROM P203B
TO P603B
TO P602B
TO P601B
TRIGGER BOARD
T
O
P401B
FROM P618B
FR
OM
P201A
T
O
P620B
CHANNEL 1
CHANNEL 2
CHANNEL 3
CHANNEL 4
CHANNEL 5
CHANNEL 6
CHANNEL 7
T
O
CH1
P101A
T
O
CH1
P102A
T
O
CH2
P101A
T
O
CH2
P102A
T
O
CH3
P101A
T
O
CH3
P102A
T
O
CH4
P101A
T
O
CH4
P102A
T
O
CH5
P101A
T
O
CH5
P102A
T
O
CH6
P101A
T
O
CH6
P102A
T
O
CH7
P101A
T
O
CH7
P102A
FR
OM
P202A
TO FAN1
TO FAN2
TO FAN3
T
O
P301A
TO P506B
FROM P207A
FR
OM
P2A
FR
OM
P1A
FROM AC INLET
FROM FUSE
TO P4A
TO P3A
TO J901
FROM J204
T
O
P619B
FR
OM
P206B
T
O
P209B
T
O
P208B
T
O
P504B
T
O
P505B
120 deg thermal breaker
P608B
MOLEX 26-01-1099
P608B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P613B
MOLEX 26-01-1099
P613B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
TP901
115deg THERMAL CIRCUIT BREAKER
TP901
115deg THERMAL CIRCUIT BREAKER
1
2
P506B
P506B
1
2
3
4
P618B
12PIN2.0-A580B
P618B
12PIN2.0-A580B
2
3
4
1
5
6
7
8
9
10
11
12
R1A1
47
R1A1
47
J102
BINDDING POST
J102
BINDDING POST
1
2
J102
BINDDING POST
J102
BINDDING POST
1
2
CONTACTS UPSIDE
P602B
MOLEX 52207-1690
CONTACTS UPSIDE
P602B
MOLEX 52207-1690
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
R1A
47
R1A
47
J102
BINDDING POST
J102
BINDDING POST
1
2
P621B
2PIN2.54-C
P621B
2PIN2.54-C
1
2
W1
W1
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P3A
MOLEX 44441-2005
P3A
MOLEX 44441-2005
1
2
3
4
5
P610B
MOLEX 26-01-1099
P610B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P2A
MOLEX_51144-0200
P2A
MOLEX_51144-0200
1
2
P607B
MOLEX 26-01-1099
P607B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
R1A1
47
R1A1
47
F1
FUSE HOLDER
F1
FUSE HOLDER
P207A
P207A
2
3
4
1
P4A
MOLEX_51144-0500
P4A
MOLEX_51144-0500
1
2
3
4
5
J102
BINDDING POST
J102
BINDDING POST
1
2
P619B
MOLEX 26-01-1089
P619B
MOLEX 26-01-1089
1
2
3
4
5
6
7
8
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
J901
2PIN2.54
J901
2PIN2.54
1
2
P401B
12PIN2.0-C
P401B
12PIN2.0-C
1
2
3
4
5
6
7
8
9
10
11
12
P616B
MOLEX 26-01-1099
P616B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P202A
MOLEX 41662
P202A
MOLEX 41662
1
2
3
4
5
6
7
8
J102
BINDDING POST
J102
BINDDING POST
1
2
R1A1
47
R1A1
47
W2
W2
P502B
KY250
P502B
KY250
1
2
P201A
MOLEX 41662
P201A
MOLEX 41662
1
2
3
4
5
6
7
8
P205B
FLEX CONNECTOR DIP16
P205B
FLEX CONNECTOR DIP16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
TP904
115deg THERMAL CIRCUIT BREAKER
TP904
115deg THERMAL CIRCUIT BREAKER
1
2
J101
RCA
J101
RCA
1
2
P617B
MOLEX 26-01-1099
P617B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P615B
MOLEX 26-01-1099
P615B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
TP903
115deg THERMAL CIRCUIT BREAKER
TP903
115deg THERMAL CIRCUIT BREAKER
1
2
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
FAN1
FAN
FAN1
FAN
1
2
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P611B
MOLEX 26-01-1099
P611B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
FAN3
FAN
FAN3
FAN
1
2
W3
W3
P209B
5PIN3.96-C
P209B
5PIN3.96-C
1
2
4
5
3
J102
BINDDING POST
J102
BINDDING POST
1
2
P204B
FLEX CONNECTOR DIP16
P204B
FLEX CONNECTOR DIP16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
R1A1
47
R1A1
47
P622B
2PIN2.54-C
P622B
2PIN2.54-C
1
2
J101
RCA
J101
RCA
1
2
P1A
MOLEX_44441-2004
P1A
MOLEX_44441-2004
1
2
3
4
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
J204
2PIN2.54
J204
2PIN2.54
1
2
R1A11
47
R1A11
47
P623B
2PIN2.54-C
P623B
2PIN2.54-C
1
2
t
TR1
T973MKII-B MAIN TRANSFORMER
t
TR1
T973MKII-B MAIN TRANSFORMER
1
2
14
3
4
5
6
7
8
9
10
11
13
15
16
17
P605B
MOLEX 26-01-1099
P605B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P505B
MOLEX 43160-2104
P505B
MOLEX 43160-2104
1
2
3
4
J102
BINDDING POST
J102
BINDDING POST
1
2
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P504B
2PIN3.96-C
P504B
2PIN3.96-C
1
2
R1A1
47
R1A1
47
U4
AC INLET
U4
AC INLET
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
J101
RCA
J101
RCA
1
2
P301A
12P2.0-A350B
P301A
12P2.0-A350B
1
2
3
4
5
6
7
8
9
10
11
12
P206B
12PIN2.0-C
P206B
12PIN2.0-C
1
2
3
4
5
6
7
8
9
10
11
12
J101
RCA
J101
RCA
1
2
FAN2
FAN
FAN2
FAN
1
2
J107
RCA
J107
RCA
1
2
P614B
MOLEX 26-01-1099
P614B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
CONTACTS UPSIDE
P601B
MOLEX 52207-1690
CONTACTS UPSIDE
P601B
MOLEX 52207-1690
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
P604B
MOLEX 26-01-1099
P604B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
J101
RCA
J101
RCA
1
2
P102A
MOLEX 41662
P102A
MOLEX 41662
1
2
3
4
5
6
7
8
9
P620B
MOLEX 26-01-1089
P620B
MOLEX 26-01-1089
1
2
3
4
5
6
7
8
P603B
10PIN2.54-C
P603B
10PIN2.54-C
1
2
3
4
5
6
7
8
9
10
11
12
P606B
MOLEX 26-01-1099
P606B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P208B
MOLEX 43160-2105
P208B
MOLEX 43160-2105
1
2
3
4
5
J101
RCA
J101
RCA
1
2
TP902
115deg THERMAL CIRCUIT BREAKER
TP902
115deg THERMAL CIRCUIT BREAKER
1
2
P612B
MOLEX 26-01-1099
P612B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P501B
PCFS2508
P501B
PCFS2508
1
2
P609B
MOLEX 26-01-1099
P609B
MOLEX 26-01-1099
1
2
3
4
5
6
7
8
9
P203B
10PIN2.54-A60B
P203B
10PIN2.54-A60B
2
3
4
1
5
6
7
8
9
10
- 7 -
WIRING DIAGRAM