NAD T955 C User manual

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CONTENTS
FRONT PANEL/REAR PANEL VIEW3
SPECIFICATIONS4
ALIGNMENT PROCEDURE/ALIGNMENT POINTS5
WIRING DIAGRAM6
SCHEMATIC DIAGRAM7-12
PCB LAYOUT13-19
ELECTRICAL PARTS LIST20-33
EXPLODED VIEW34-36
EXPLODED VIEW PARTS LIST37
PACKING DIAGRAM38
SERVICE SAFETY PRECAUTIONS
1. Replacing the Fuses
CAUTION: FOR CONTINUED PROTECTION AGAINST THE RISK OF FIRE
REPLACE ONLY WITH SAME TYPE OF FUSE.
REFERENCE NO. PART NUMBER DESCRIPTION
Rear Panel
AH 20-12153-10 MDA T15AL/250V
C 20-12702-20 MDA T7AL/250V
POWER SUPPLY Board
F201---F220 20-12632-00 T6.3AL/250V
NOTE:
*AH : North American version only
*C : European version only
2. Safety-check out (North American model only)
Before returning the product to the customer, make leakage current or
resistance measurements to determine that exposed parts are acceptably
insulated from the supply circuit.
Parts marked with the symbol are critical with regard to the risk of fire and
electric shock.Replace only parts recommended by the manufacturer.
-2-

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-3-

SPECIFICATIONS
CONTINUOUS AVERAGE POWER ≥100 W (20.0 dBW)
OUTPUT INTO 8 OHMS OR 4 OHMS
(Min. power per channel, 20 Hz – 20 kHz, both
channels driven, with no more than rated
distortion)
Rated Distortion ≤0.03%
(THD 20 Hz – 20 kHz)
Clipping power ≥130 W
(maximum continuous power per channel).
IHF dynamic power
(Maximum short term power per channel)
8ohms: ≥150 W (22 dBW)
4ohms: ≥250 W (24 dBW)
2ohms: ≥330 W (25.2 dBW)
Damping factor >250
(ref. 8 ohms 50Hz)
Input Impedance R = 20KΩ
C = 380 pF
Input sensitivity (for rated output into 8 ohms) 1000mV+/-50mV
Voltage gain 29 dB
Frequency response 20 Hz – 20 kHz ±0.2 dB
- 3dB at 3 Hz/70 kHz
Signal / Noise ratio, A-weighted >102 dB ref. 1 W
Dimensions and Weights
Net Weight 21.8 kg (48.0 Ib)
Shipping Weight 25 kg (55.1 Ib)
Dimension (W×H×D) 435 ×155 ×387mm
-4-

ALIGNMENT PROCEDURE
A. DC OFFSET VOLTAGE
The DC OFFSET between OFFSET Test Point and AGND must be within 0+/-20mV.
B. IDLING CURRENT
The idling current in the output stage of the poweramp should be set to 25mA+/-5mA per
pnp-npn transistor pair( This means the mid point voltage is 4mV with down limit of 3mV
and up limit of 5mV). The alignment procedure is: At first, adjust RV103 (Marked as “Idling
Current ADJ” in the drawing below) for a voltage of 4mV +/- 1mV between Test point 1 and
2. Then preheat the unit for 5 minutes, let idling current settled and then readjust to 4mV +/-
1mV.
Pls note: Though the idling current is set as 4mV +/-1mV during the adjustment, due to the
influence of varied ambient temperature and mains voltage etc., the idling current will drift after
some time. During the normal checking of idling current in the service field, it’s acceptable as
long as the voltage is in the range of 3mV—5mV.
C. ISC SENSITIVITY
The ISC sensing voltage can allow 0mV+/-50mV. But, for the alignment process in our
factory, we tighten the limit to 0mV+/-10mV. That is to adjust Pot RV104 (as marked as
“ISC SENS ADJ” in the below drawing) to get a voltage between the “ISC SENSE TEST
POINT” and AGND to be 0mV+/-10mV.
-5-

VSS1
AGND1
AGND1
VPP1
ISC1
VSS1
AGND1
AGND1
VPP1
ACOFF1
DGND
SC
LED1
ISC1 VSS2
AGND2
AGND2
VPP2
ACOFF2
DGND
SC
LED2
ISC2 VSS3
AGND3
AGND3
VPP3
ACOFF3
DGND
SC
LED3
ISC3 VSS4
AGND4
AGND4
VPP4
ACOFF4
DGND
SC
LED4
ISC4 VSS5
AGND5
AGND5
VPP5
ACOFF5
DGND
SC
LED5
ISC5
DGND
STBY
+5.5V
SC
+5.5V
THERMAL
AC1 AC2AC2
RELAY
LED3
DGND
LED2
SC
+5.5V
STBYLED
LED1
LED5
LED4
ACOFF1
DGND
SC
LED1
VSS1
AGND1
AGND1
VPP1
ISC1
ACOFF1
DGND
SC
LED1
VSS1
AGND1
AGND1
VPP1
ISC1
ACOFF1
DGND
SC
LED1
VSS1
AGND1
AGND1
VPP1
ISC1
ACOFF1
DGND
SC
LED1
VSS1
AGND1
AGND1
VPP1
ISC1
ACOFF1
DGND
SC
LED1
STBY
DGND
+5VD
SC
LED3
DGND
LED2
SC
+5VD
STBYLED
LED1
LED5
LED4
POWERAMP BOARD
POWER SUPPLY BOARD
POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD POWERAMP BOARD
STANDBY BOARD
POWER LED BOARD
FROM P3021A
FROM AC INLETFROM FUSE
FROM P202BTO CH1 P101A
TO CH2 P101A TO CH3 P101A TO CH4 P101A TO CH5 P101A
FROM P204B FROM P206B FROM P208B FROM P210B
FROM TRANSFORMER FROM TRANSFORMER FROM TRANSFORMER FROM TRANSFORMER FROM TRANSFORMER
CH1 CH2 CH3 CH4 CH5
FROM TRANSFORMER
TO P504B
FROM P212A
TRIGGER BOARD
FROM P302
FROM P302A
TO P211B
TO P701B
DISPLAY BOARD
P501BP501B
1 2
P207BP207B
1 2 4 5 3
P209BP209B
1 2 4 5 3
P101AP101A
1
2
3
4
5
6
7
8
9
P208BP208B
1
2
3
4
5
6
7
8
9
P205BP205B
1 2 4 5 3
P504BP504B
1
2
3
4
5
P213BP213B
1
2
3
4
P101AP101A
1
2
3
4
5
6
7
8
9
P302AP302A
2
3
4
1
5
6
7
8
9
P506BP506B
1
2
3
4
P701BP701B
1
2
3
P101AP101A
1
2
3
4
5
6
7
8
9
P203BP203B
1 2 4 5 3
C
GR
P502BP502B
1 2
P211BP211B
1
2
3
4
5
6
7
8
9
P204BP204B
1
2
3
4
5
6
7
8
9
P101AP101A
1
2
3
4
5
6
7
8
9
P505BP505B
1
2
P212AP212A
2 3 4 1 5
P101AP101A
1
2
3
4
5
6
7
8
9
P201BP201B
1 2 4 5 3
P301AP301A
2
3
1
P401AP401A
2
3
4
1
P210BP210B
1
2
3
4
5
6
7
8
9
P202BP202B
1
2
3
4
5
6
7
8
9
P206BP206B
1
2
3
4
5
6
7
8
9
-6-
WIRING DIAGRAM

AGND
LED
SC
ISC
VSS
OFFSET
AGND
AGND
TP3
OFFSET
TP2
TP1
ACOFF
DGND
VPP
TP3
TH2
AGND
EGND
TP1
TP2
-15VA
AGND
+15VA
TH1
TH2
TH1
-15VA
+15VA
-15VA
VCC
+15VA
VSS
+15VA
+15VA
VCC
VSS
-15VA
+15VA
-15VA
-15VA
TO CONNECTION BOARD
/1/4W
/1KV
/2W
/2W
/2W
/1W
/1KV
/1KV
/1KV
/25V
/25V
/1W
/1W
/1W
/1W
/1/4W
/1/4W
/1/4W
/1/4W
/1/4W
/1/4W
/100V
/1/4W
/1/4W
/80V
/80V
/1/2W
/1/2W
/1/4W
/1/2W
/1KV
/1/2W
/1/4W
/1/4W
/1KV
/25V
/25V
/63V
/1KV
/25V /1/2W
/1%
/1%
/25V
/63V
/1/2W
/1/2W
/1KV
/3W
/1/2W
/1/2W
/1%
/1%
/1% /1%
/1% /1%
All Polyester capacitors are 63V 5% unless noted.
All Elec. capacitors are 50V 20% unless noted.
All Resistor are 1/6W 5% RJ13 unless noted.
Idling current setting:
Adjust RV103 let voltage between TP1 and TP2:4mV±1mV
ISC sensitivity setting:
Adjust RV101 let voltage at TP3: 0mV±20mV
/1/2W
/1/2W
/10V
TEST POINT
/100V
/1W
/2W
/1/2W
/16V
/16V
/5W
/5W
/1/4W
/1/4W
/25V
/25V
/1KV
/1KV
/1/2W
/1/2W
AGND
TP1
AGND
OFFSET
TP3
TP2
bce
2SA1943
2SC5200
KSA1220
KSC2690
bce 2SA970
2SA1015
bce
2SC1815
2SC2240
MPSA42
MPSA92
bce
MPSA06
MPSA56
2SB647
2SD667
/2W /1/2W
/1W
/1%
/1%
/1%
TEST POINT
12
R133
0
R133
0
J101
RCA
J101
RCA
1
2
Q111
2SC1815
Q111
2SC1815
R108
680
R108
680
R172
100K
R172
100K
Q116
2SC2240
Q116
2SC2240
C152
N.I.
C152
N.I.
D114
1N4148
D114
1N4148
Q106
MPSA92
Q106
MPSA92
R190
2.2
R190
2.2
IC103
MC14541BD
IC103
MC14541BD
Ctc
2
Rs
3
NC
4
AR
5
MR
6
Vss
7
Vcc 14
SEL 9
Q8
MODE 10
Rtc
1
NC 11
A12
B13
R167
82
R167
82
R1K1
47K
R1K1
47K
R145
220K
R145
220K
Q127
KTB1369
Q127
KTB1369
Q132
MPSA42
Q132
MPSA42
R144
100
R144
100
L101
1uH
L101
1uH
L104
N.I.
L104
N.I.
R115
0.05
R115
0.05
Q145
2SA970
Q145
2SA970
R192
1R192 1
+
C113
1uF
+
C113
1uF
R173
1.5K
R173
1.5K
Q119
2SC1815
Q119
2SC1815
R1A6
10K
R1A6
10K
+
C117
10uF
+
C117
10uF
R135
10K
R135
10K
R1A8
100K
R1A8
100K
C161
100nF
C161
100nF
C164
100nF
C164
100nF
C144
100nF
C144
100nF
R1A0
1K
R1A0
1K
R1H8
3.9K
R1H8
3.9K
+
C111
1uF
+
C111
1uF
R123
10K
R123
10K
D132
BAV21
D132
BAV21
C154
100nF
C154
100nF
C135
470pF
C135
470pF
+
C119
1uF
+
C119
1uF
+
C143
4.7uF
+
C143
4.7uF
D117
4.7
D117
4.7
R1X6
16K
R1X6
16K
R124
470K
R124
470K
+
C122
10uF
+
C122
10uF
R136
560
R136
560
C147
N.I.
C147
N.I.
HS101
HEATSINK_1
HS101
HEATSINK_1
R1Y1
220K
R1Y1
220K
C148
470nF
C148
470nF
+
-
IC101A
TL082CD
+
-
IC101A
TL082CD
3
21
R151
22K
R151
22K
R148
22K
R148
22K
R199
1K
R199
1K
R197
300
R197
300
R156
39K
R156
39K
D127
3.3V
D127
3.3V
D101
15V
D101
15V
R1E0
100K
R1E0
100K
C159
100nF
C159
100nF
RL101
JQX-115F/024/1HS1
RL101
JQX-115F/024/1HS1
4
32
1
R1F1
910K
R1F1
910K
D124
BAV21
D124
BAV21
R1E9
1meg
R1E9
1meg
R158
220K
R158
220K
R163
N.I.
R163
N.I.
PC101
PC817A
PC101
PC817A
1 2
4 3
+
C133
47uF
+
C133
47uF
R194
0.068
R194
0.068
Q128
2SA1943
Q128
2SA1943
R1X8
33K
R1X8
33K
D122
1N4148
D122
1N4148
R1E3
47
R1E3
47
C142
22nF
C142
22nF
+
C104
220uF
+
C104
220uF
D120
1N4148
D120
1N4148
D106
2.2V
D106
2.2V
C130
68pF
C130
68pF
Q102
KSA1220
Q102
KSA1220
R1E7
36
R1E7
36
Q142
2SC1815
Q142
2SC1815
Q143
2SC1815
Q143
2SC1815
L102
100uH
L102
100uH
D121
1N4148
D121
1N4148
Q134
MPSA06
Q134
MPSA06
PC102
PC817A
PC102
PC817A
1
2
4
3
Q129
2SC5200
Q129
2SC5200
R196
2.2
R196
2.2
Q124
N.I.
Q124
N.I.
Q123
KTD2061
Q123
KTD2061
+
C112
1uF
+
C112
1uF
R101
680
R101
680
R1H6
820
R1H6
820
C132
100nF
C132
100nF
+
C103
220uF
+
C103
220uF
D128
3.3V
D128
3.3V
R159
33
R159
33
C162
N.I.
C162
N.I.
R142
1K
R142
1K
R187
N.I.
R187
N.I.
R117
9.1K
R117
9.1K
R122
10K
R122
10K
R185
18
R185
18
R1X2
2.2K
R1X2
2.2K
+
C170
10uF
+
C170
10uF
R188
N.I.
R188
N.I.
C115
220uF
C115
220uF
R160
33
R160
33
Q136
MPSA92
Q136
MPSA92
R179
10
R179
10
R168
82
R168
82
Q112
2SA970
Q112
2SA970
C140
100nF
C140
100nF
R174
1.5K
R174
1.5K
R1E8
2.2K
R1E8
2.2K
D107
BAV21
D107
BAV21
D115
1N4148
D115
1N4148
Q104
2SA970
Q104
2SA970
R119
120K
R119
120K
R164
22K
R164
22K
R112
680
R112
680
C131
N.I.
C131
N.I.
R131
10K
R131
10K
R186
18
R186
18
+
C108
47uF
+
C108
47uF
R166
10K
R166
10K
R191
1R191 1
R150
10
R150
10
R182
22
R182
22
D133
1N4148
D133
1N4148
R1K3
2.2K
R1K3
2.2K
+
-
IC102B
TL082CD
+
-
IC102B
TL082CD
5
67
84
D119
1N4148
D119
1N4148
D130
1N4148
D130
1N4148
Q118
2SA1015
Q118
2SA1015
+
C114
1uF
+
C114
1uF
D125
1N4148
D125
1N4148
R134
1K
R134
1K
IC104
TL431
IC104
TL431
2 3
1
+
C102
220uF
+
C102
220uF
C129
68pF
C129
68pF
R138
27K
R138
27K
R1H2
N.I.
R1H2
N.I.
R157
220K
R157
220K R1H5
470K
R1H5
470K
R189
2.2
R189
2.2
R1H1
10K
R1H1
10K
R178
5.6
R178
5.6
R1A4
22K
R1A4
22K
R1K4
47
R1K4
47
Q120
2SB647
Q120
2SB647
R161
82
R161
82
P102A
2.54mm2X3
P102A
2.54mm2X3
1
5
36
2
4
R1E6
1meg
R1E6
1meg
D116
1N4148
D116
1N4148
D102
1N5404
D102
1N5404
Q141
KSC2690
Q141
KSC2690
R1X4
6.8K
R1X4
6.8K
+
C151
22uF
+
C151
22uF
R1H0
22K
R1H0
22K
+
-
IC102A
TL082CD
+
-
IC102A
TL082CD 3
2
1
R1H9
22K
R1H9
22K
R171
100K
R171
100K
+
C110
47uF
+
C110
47uF
Q108
MPSA06
Q108
MPSA06
R1E1
22K
R1E1
22K
R180
10
R180
10
C157
220nF
C157
220nF
CW
RV102
0
CW
RV102
0
13
2
D111
24V
D111
24V
R127
100K
R127
100K
D136
LED
D136
LED
R1G1
100
R1G1
100
CB102
ST-22 70C L TYPE
CB102
ST-22 70C L TYPE
1 2
R139
1K
R139
1K
D126
1N4148
D126
1N4148
C138
220pF
C138
220pF
C158
100nF
C158
100nF
R195
2.2
R195
2.2
R162
82
R162
82
R1H7
220K
R1H7
220K
C155
22nF
C155
22nF
D108
6.8V
D108
6.8V
R126
100K
R126
100K
D110
24V
D110
24V
R169
82
R169
82
R155
39K
R155
39K
C123
180pF
C123
180pF
R1E5
1
R1E5
1
C105
22pF
C105
22pF
+
C109
47uF
+
C109
47uF
BP101
BINDDING POST
BP101
BINDDING POST
1
2
Q139
2SA970
Q139
2SA970
C124
470pF
C124
470pF
Q105
MPSA92
Q105
MPSA92
R141
1K
R141
1K
R109
680
R109
680
Q131
2SC5200
Q131
2SC5200
Q110
2SA1015
Q110
2SA1015
C145
10nF
C145
10nF
R137
27K
R137
27K
R1X3
2.2K
R1X3
2.2K
R1A1
15K
R1A1
15K
C165
100nF
C165
100nF
R1A5
22K
R1A5
22K R1H3
3.3K
R1H3
3.3K
C121
100nF
C121
100nF
P101A
MOLEX 41662
P101A
MOLEX 41662
1
2
3
4
5
6
7
8
9
R1E4
2.7
R1E4
2.7
+
C107
47uF
+
C107
47uF
D103
1N4148
D103
1N4148
P104A
3PIN2.54-C
P104A
3PIN2.54-C
1
2
3
R175
330
R175
330
R1A3
4.7K
R1A3
4.7K
R1E2
1K
R1E2
1K
Q107
MPSA06
Q107
MPSA06
L103
N.I.
L103
N.I.
R1X1
1.8K
R1X1
1.8K
R102
680
R102
680
D112
2.7V
D112
2.7V
R165
Short
R165
Short
+
-
IC101B
TL082CD
+
-
IC101B
TL082CD
5
6
7
84
R193
0.068
R193
0.068
D129
1N4148
D129
1N4148
Q137
MPSA56
Q137
MPSA56
Q126
KTD2061
Q126
KTD2061
R1A7
100K
R1A7
100K
Q114
2SC2240
Q114
2SC2240
+
C134
47uF
+
C134
47uF
R104
33
R104
33
R1H4
1.5K
R1H4
1.5K
R198
1K
R198
1K
D104
1N4148
D104
1N4148
Q144
2SA1015
Q144
2SA1015
R111
680
R111
680
R125
390K
R125
390K
Q101
KSC2690
Q101
KSC2690
CB101
ST-22 75C L TYPE
CB101
ST-22 75C L TYPE
12
D109
1N4148
D109
1N4148
Q130
2SA1943
Q130
2SA1943
Q117
2SA970
Q117
2SA970
R140
1K
R140
1K
+
C101
220uF
+
C101
220uF
R143
100
R143
100
D135
1N4148
D135
1N4148
R1K2
100K
R1K2
100K
C137
220pF
C137
220pF
Q140
2SC1815
Q140
2SC1815
R146
470
R146
470
+
C146
Short
+
C146
Short
Q122
KTB1369
Q122
KTB1369
+
C125
150uF
+
C125
150uF R1A9
47K
R1A9
47K
C153
100nF
C153
100nF
R1K5
47
R1K5
47
R147
100
R147
100
Q125
N.I.
Q125
N.I.
+
C171
10uF
+
C171
10uF
D118
4.7
D118
4.7
Q146
2SC2240
Q146
2SC2240
Q138
2SC2240
Q138
2SC2240
R103
33
R103
33
+
C127
10uF
+
C127
10uF
R114
4.3K
R114
4.3K
D131
15V
D131
15V
R105
680
R105
680
R121
220K
R121
220K
C163
N.I.
C163
N.I.
CW
RV103
100
CW
RV103
100
1 3
2
C141
N.I.
C141
N.I.
+
C139
4.7uF
+
C139
4.7uF
+
C150
22uF
+
C150
22uF
R181
430
R181
430
Q103
2SC2240
Q103
2SC2240
CW
RV101
100K
CW
RV101
100K
13
2
R154
100
R154
100
R120
220K
R120
220K
R130
10K
R130
10K
D105
BAV21
D105
BAV21
R132
0
R132
0
R118
470K
R118
470K
C106
22pF
C106
22pF
R183
15
R183
15
R128
220K
R128
220K
R1X7
10K
R1X7
10K
+
C126
150uF
+
C126
150uF
R152
22K
R152
22K
R129
220K
R129
220K
R153
100
R153
100
P103A
Ground Solder Tap
P103A
Ground Solder Tap
1
R184
15
R184
15
R110
680
R110
680
+
C128
10uF
+
C128
10uF
Q115
2SA970
Q115
2SA970
C160
100nF
C160
100nF
R170
82
R170
82
D123
24V
D123
24V
R107
680
R107
680
Q113
2SC2240
Q113
2SC2240
D134
LED
D134
LED
C1G1
100nF
C1G1
100nF
R1A2
15K
R1A2
15K
C149
470nF
C149
470nF
Q121
2SD667
Q121
2SD667
R106
680
R106
680
P105A
2PIN2.54-C
P105A
2PIN2.54-C
1
2
R116
100
R116
100
R176
330
R176
330
R177
5.6
R177
5.6
D113
1N4148
D113
1N4148
Q147
MPSA42
Q147
MPSA42
+
C118
10uF
+
C118
10uF
C156
1nF
C156
1nF
Q133
MPSA92
Q133
MPSA92
Q135
MPSA56
Q135
MPSA56
R149
10
R149
10
+
C120
1uF
+
C120
1uF
R1X5
1K
R1X5
1K
R113
4.7K
R113
4.7K
C136
470pF
C136
470pF
-7-
SCHEMATICS DIAGRAM

ISC1
V-1
AGND1
AGND1
V+1
ACOFF1
DGND
SC
LED1
ISC2
V-2
AGND2
AGND2
V+2
ACOFF2
DGND
SC
LED2
ISC3
V-3
AGND3
AGND3
V+3
ACOFF3
DGND
SC
LED3
ISC4
V-4
AGND4
AGND4
V+4
ACOFF4
DGND
SC
LED4
ISC5
V-5
AGND5
AGND5
V+5
ACOFF5
DGND
SC
LED5
AC2AC2
AC1
+5.5V
SC
+5.5V
STBYLED
LED1
LED5
LED4
LED3
LED2
STBYLED
STBY
DGND
DGNDDGND
STBY
+5.5V
SC
RELAY
THERMAL
/100V
/100V
/250V
/100V
/100V
/250V
/1/4W
/1/4W /100V
/80V
/80V
/100V
/100V
/250V
/100V
/100V
/250V
/1/4W
/1/4W /100V
/80V
/80V
/100V
/100V
/250V
/100V
/100V
/250V
/1/4W
/1/4W /100V
/80V
/80V
/100V
/100V
/250V
/100V
/100V
/250V
/1/4W
/1/4W /100V
/80V
/80V
/100V
/100V
/250V
/100V
/100V
/250V
/1/4W
/1/4W /100V
/80V
/80V
/25V
FROM MAIN TRANSFORMERFROM MAIN TRANSFORMERFROM MAIN TRANSFORMER
FROM MAIN TRANSFORMER
FROM MAIN TRANSFORMER
TO DISSPLAY BOARD
TO STANDBY BOARD
FROM TRIG BOARD
TO POWERAMP MODULE1TO POWERAMP MODULE2TO POWERAMP MODULE3TO POWERAMP MODULE4
TO POWERAMP MODULE5
FOR BR201,BR205,TH202&TH205
FOR BR202&TH202
FOR BR203&TH203
FOR BR204&TH204
FOR BR205&TH205
FOR BR210&TH210
FOR BR207&TH207
FOR IC201
All Polyester capacitors are 63V unless noted.
All Elec. capacitors are 50V unless noted.
All Resistor are 1/6W RJ13 unless noted.
/250V
123
BT151
LM7806
/100V /100V
/100V
FOR BR202,BR206,TH201&TH206
FOR BR208,BR209,TH208&TH209
+
C240
6800uF
+
C240
6800uF
R207
1K
R207
1K
P203B
5PIN3.96-C
P203B
5PIN3.96-C
1
2
4
5
3
R228
100
R228
100
HS205
70-004003-1
HS205
70-004003-1
Q219
MPSA92
Q219
MPSA92
R241
1K
R241
1K
+
C203
10uF
+
C203
10uF
P204B
MOLEX 2145
P204B
MOLEX 2145
2
3
4
5
6
7
8
9
1
R244
22K
R244
22K
R231
22K
R231
22K
R250
1K
R250
1K
R208
1K
R208
1K
Q210
2SA1015
Q210
2SA1015
R243
22K
R243
22K
R214
1K
R214
1K
P213B
4PIN2.54-C
P213B
4PIN2.54-C
1
2
3
4
R238
1K
R238
1K
+
C216
10uF
+
C216
10uF
+
C220
6800uF
+
C220
6800uF
Q207
MPSA92
Q207
MPSA92
R267
470
R267
470
F212
T6.3AL/250V
F212
T6.3AL/250V
Q202
2SA1015
Q202
2SA1015
R225
10K
R225
10K
TH203
BT151-500R
TH203
BT151-500R
3
1 2
+
C209
6800uF
+
C209
6800uF
~
~
+-
BR206
KBU8D
~
~
+-
BR206
KBU8D
R253
1K
R253
1K
R218
100
R218
100
F206
T6.3AL/250V
F206
T6.3AL/250V
F202
T6.3AL/250V
F202
T6.3AL/250V
+
C247
10uF
+
C247
10uF
+
C213
6800uF
+
C213
6800uF
+
C229
6800uF
+
C229
6800uF
F204
T6.3AL/250V
F204
T6.3AL/250V
TH209
BT151X-500R
TH209
BT151X-500R
3
1 2
F216
T6.3AL/250V
F216
T6.3AL/250V
Q205
2SC1815
Q205
2SC1815
C224
10nF
C224
10nF
R237
10K
R237
10K
Q204
MPSA42
Q204
MPSA42
R234
15K
R234
15K
F218
T6.3AL/250V
F218
T6.3AL/250V
Q216
MPSA42
Q216
MPSA42
+
C218
10uF
+
C218
10uF
+
C238
6800uF
+
C238
6800uF
Q217
2SC1815
Q217
2SC1815
HS206
70-062007-0
HS206
70-062007-0
Q221
2SC1815
Q221
2SC1815
F211
T6.3AL/250V
F211
T6.3AL/250V
+
C250
2200uF
+
C250
2200uF
C233
10nF
C233
10nF
R230
100
R230
100
P201B
5PIN3.96-C
P201B
5PIN3.96-C
1
2
4
5
3
C207
100nF
C207
100nF
F220
T6.3AL/250V
F220
T6.3AL/250V
Q212
MPSA42
Q212
MPSA42
~
~
+-
BR211
DB104G
~
~
+-
BR211
DB104G
R246
15K
R246
15K
R211
1K
R211
1K
+
C225
10uF
+
C225
10uF
+
C245
10uF
+
C245
10uF
+
C227
10uF
+
C227
10uF
F215
T6.3AL/250V
F215
T6.3AL/250V
P207B
5PIN3.96-C
P207B
5PIN3.96-C
1
2
4
5
3
IC201
LM7806CT
IC201
LM7806CT
O
3I1
G
2
Q211
MPSA92
Q211
MPSA92
TH201
BT151X-500R
TH201
BT151X-500R
3
12
F208
T6.3AL/250V
F208
T6.3AL/250V
R205
22K
R205
22K
R216
100
R216
100
+
C222
6800uF
+
C222
6800uF
HS203
70-004003-1
HS203
70-004003-1
+
C211
6800uF
+
C211
6800uF
F203
T6.3AL/250V
F203
T6.3AL/250V
R249
10K
R249
10K
R266
100K
R266
100K
P209B
5PIN3.96-C
P209B
5PIN3.96-C
1
2
4
5
3
+
C234
10uF
+
C234
10uF
Q215
MPSA92
Q215
MPSA92
+
C236
10uF
+
C236
10uF
HS204
70-004003-1
HS204
70-004003-1
C215
10nF
C215
10nF
Q214
2SA1015
Q214
2SA1015
C201
10nF
C201
10nF
R217
1K
R217
1K
R252
100
R252
100
+
C231
6800uF
+
C231
6800uF
R254
100
R254
100
F219
T6.3AL/250V
F219
T6.3AL/250V
C206
100nF
C206
100nF
Q201
2SC1815
Q201
2SC1815
R248
4.7K
R248
4.7K
+
C226
10uF
+
C226
10uF
R227
1K
R227
1K
C242
10nF
C242
10nF
C212
100nF
C212
100nF
HS201
70-062007-0
HS201
70-062007-0
C248
100nF
C248
100nF
Q222
2SD667
Q222
2SD667
+
C205
10uF
+
C205
10uF
F207
T6.3AL/250V
F207
T6.3AL/250V
R203
1K
R203
1K
R236
4.7K
R236
4.7K
Q218
2SA1015
Q218
2SA1015
+
C235
10uF
+
C235
10uF
R224
4.7K
R224
4.7K
R210
1K
R210
1K
C239
100nF
C239
100nF
HS202
70-062007-0
HS202
70-062007-0
D205
1N4007
D205
1N4007
Q206
2SA1015
Q206
2SA1015
+
C208
6800uF
+
C208
6800uF
P202B
MOLEX 2145
P202B
MOLEX 2145
2
3
4
5
6
7
8
9
1
~
~
+-
BR203
KBU8D
~
~
+-
BR203
KBU8D
+
C244
10uF
+
C244
10uF
Q208
MPSA42
Q208
MPSA42
P208B
MOLEX 2145
P208B
MOLEX 2145
2
3
4
5
6
7
8
9
1
R239
1K
R239
1K
R257
1K
R257
1K
R212
100
R212
100
R219
22K
R219
22K
R256
22K
R256
22K
F201
T6.3AL/250V
F201
T6.3AL/250V
R265
1K
R265
1K
~
~
+-
BR207
KBU8D
~
~
+-
BR207
KBU8D
~
~
+-
BR201
KBU8D
~
~
+-
BR201
KBU8D
D202
1N4007
D202
1N4007
Q220
MPSA42
Q220
MPSA42
TH210
BT151-500R
TH210
BT151-500R
3
12
+
C217
10uF
+
C217
10uF
R260
4.7K
R260
4.7K
R206
22K
R206
22K
R258
15K
R258
15K
HS208
70-004003-1
HS208
70-004003-1
C202
10nF
C202
10nF
R255
22K
R255
22K
C230
100nF
C230
100nF
TH204
BT151-500R
TH204
BT151-500R
3
12
C214
10nF
C214
10nF
+
C204
10uF
+
C204
10uF
C232
10nF
C232
10nF
R201
4.7K
R201
4.7K
P211B
9PIN2.54-C
P211B
9PIN2.54-C
1
2
3
4
5
6
7
8
9
R213
10K
R213
10K
C219
100nF
C219
100nF
F210
T6.3AL/250V
F210
T6.3AL/250V
R221
1K
R221
1K
~
~
+-
BR209
KBU8D
~
~
+-
BR209
KBU8D
D203
1N4007
D203
1N4007
R204
10K
R204
10K
C221
100nF
C221
100nF
C237
100nF
C237
100nF
P212A
5PIN2.54-A150B
P212A
5PIN2.54-A150B
2
3
4
1
5
Q203
MPSA92
Q203
MPSA92
~
~
+-
BR204
KBU8D
~
~
+-
BR204
KBU8D
~
~
+-
BR205
KBU8D
~
~
+-
BR205
KBU8D P206B
MOLEX 2145
P206B
MOLEX 2145
2
3
4
5
6
7
8
9
1
C246
10nF
C246
10nF
R209
100
R209
100
R233
1K
R233
1K
C228
100nF
C228
100nF
F214
T6.3AL/250V
F214
T6.3AL/250V
R220
22K
R220
22K
R259
1K
R259
1K
D204
1N4007
D204
1N4007
F213
T6.3AL/250V
F213
T6.3AL/250V
D201
1N4007
D201
1N4007
C249
100nF
C249
100nF
C241
10nF
C241
10nF
TH206
BT151X-500R
TH206
BT151X-500R
3
12
C210
100nF
C210
100nF
~
~
+-
BR208
KBU8D
~
~
+-
BR208
KBU8D
R242
100
R242
100
F205
T6.3AL/250V
F205
T6.3AL/250V
~
~
+-
BR202
KBU8D
~
~
+-
BR202
KBU8D
TH207
BT151-500R
TH207
BT151-500R
3
1 2
R232
22K
R232
22K
C223
10nF
C223
10nF
R251
1K
R251
1K
HS207
70-004003-1
HS207
70-004003-1
R222
15K
R222
15K
R226
1K
R226
1K
TH208
BT151X-500R
TH208
BT151X-500R
3
12
F209
T6.3AL/250V
F209
T6.3AL/250V
R235
1K
R235
1K
Q213
2SC1815
Q213
2SC1815
R240
100
R240
100
R202
15K
R202
15K
P205B
5PIN3.96-C
P205B
5PIN3.96-C
1
2
4
5
3
TH205
BT151X-500R
TH205
BT151X-500R
3
1 2
P210B
MOLEX 2145
P210B
MOLEX 2145
2
3
4
5
6
7
8
9
1
R229
1K
R229
1K
F217
T6.3AL/250V
F217
T6.3AL/250V
R245
1K
R245
1K
TH202
BT151X-500R
TH202
BT151X-500R
3
1 2
Q209
2SC1815
Q209
2SC1815
R215
1K
R215
1K
~
~
+-
BR210
KBU8D
~
~
+-
BR210
KBU8D
R223
1K
R223
1K
+
C243
10uF
+
C243
10uF
R247
1K
R247
1K
-8-
SCHEMATICS DIAGRAM

SC
LED3
DGND
LED2
SC
+5VD
STBYLED
LED1
LED5
LED4
+5V
+5V
LED1
DGND
+5VD
DGND
LED2 +5V LED3 +5V LED4 +5V LED5 +5V
STBYLED
+5V
DGND DGND DGND STBYLED
DGND
STBYLED
GREEN
+5VD
All Polyester capacitors are 63V unless noted.
All Elec. capacitors are 50V unless noted.
All Resistor are 1/6W RJ13 unless noted.
ece b
2SC1815
SC-43 SC-43
2N4401
2N4403
cb
GND
IN
SC-72
DTA114ESA
DTC114ESA
OUT
RG
L57EGW
FROM POWER
SUPPLY BOARD
POWER LED BOARD
/16V /16V /16V /16V
Optional
R313
150
R313
150
Q304
DTC114ESA
Q304
DTC114ESA
R327
1K
R327
1K
D701
BL-BJLB4204
D701
BL-BJLB4204
C
GR
Q307
2SA1015
Q307
2SA1015
D301
BL-BUBB4274
D301
BL-BUBB4274
Q311
2SA1015
Q311
2SA1015
Q316
DTC114ESA
Q316
DTC114ESA
R304
150
R304
150
R323
1K
R323
1K
R307
150
R307
150
P302A
9PIN2.54-A240B
P302A
9PIN2.54-A240B
2
3
4
1
5
6
7
8
9
+
C304
33uF
+
C304
33uF
Q314
2N4401
Q314
2N4401
R311
150
R311
150
D308
1N4148
D308
1N4148
Q303
2SA1015
Q303
2SA1015
+
C303
33uF
+
C303
33uF
D306
BL-BUBB4274
D306
BL-BUBB4274
R326
1K
R326
1K
D302
BL-BUBB4274
D302
BL-BUBB4274
R317
150
R317
150
D305
BL-BUBB4274
D305
BL-BUBB4274
R324
1K
R324
1K Q306
DTC114ESA
Q306
DTC114ESA
R319
1K
R319
1K
R314
150
R314
150
Q302
DTC114ESA
Q302
DTC114ESA
+
C302
33uF
+
C302
33uF
Q305
2SA1015
Q305
2SA1015
P701A
3P2.54-C
P701A
3P2.54-C
1
2
3
D303
BL-BUBB4274
D303
BL-BUBB4274
Q312
DTC114ESA
Q312
DTC114ESA
Q309
2SA1015
Q309
2SA1015
Q315
2N4403
Q315
2N4403
+
C301
100uF
+
C301
100uF
R308
150
R308
150
R306
1K
R306
1K
R303
1K
R303
1K
D304
BL-BUBB4274
D304
BL-BUBB4274
Q308
DTC114ESA
Q308
DTC114ESA Q310
DTC114ESA
Q310
DTC114ESA
P301A
3PIN2.54-A130B
P301A
3PIN2.54-A130B
2
3
1
R328
1K
R328
1K
Q313
2SC1815
Q313
2SC1815
R310
150
R310
150 R316 150
R316
150
R309
1K
R309
1K
R312
1K
R312
1K
R325
1K
R325
1K
R305
150
R305
150
R315
1K
R315
1K
R302
150
R302
150
Q301
2SC1815
Q301
2SC1815
R322
2.2K
R322
2.2K
R301
10K
R301
10K
R321
2.2K
R321
2.2K
R318
1K
R318
1K
-9-
SCHEMATICS DIAGRAM

REAR PANNEL
7V
0V
NEUTRAL
LIVE
F1 (user accessible fuse)
T955 120V/230V TABLE
W501&W504
230V120V
NO INSERT INSERT
T15AL/250V T7AL/250V
W502,W503&W505 NO INSERTINSERT
POWER SWITCH BOARD FROM POWER SUPPLY BOARD
FROM MAIN TRANSFORMER
TO MAIN TRANSFORMER
/275VAC
TV-8 RATING
P3
P4
P1
P2
W1
14-97301-01
W1
14-97301-01
S601
SW SPST
S601
SW SPST
12
t
TR501
TD050-E103P
t
TR501
TD050-E103P
1
5
10
6
2
W3
14-97301-03
W3
14-97301-03
C501
220nF
C501
220nF
W501
10mm JUMPER
W501
10mm JUMPER
1 2
D501
1N4148
D501
1N4148
P502B
KY250
P502B
KY250
1
2
P501B
PCFS2508
P501B
PCFS2508
1
2
W503
7.5mm JUMPER
W503
7.5mm JUMPER
12
RL501
832A-1A-C-BH DC5V
RL501
832A-1A-C-BH DC5V
3
41
2
U1
AC INLET
U1
AC INLET
P504B
5PIN2.54-C
P504B
5PIN2.54-C
1
2
3
4
5
P505B
2PIN3.96-C
P505B
2PIN3.96-C
1
2
W502
15mm JUMPER
W502
15mm JUMPER
1 2
W504
10mm JUMPER
W504
10mm JUMPER
12
W505
7.5mm UMPER
W505
7.5mm UMPER
12
F1
FUSE HOLDER
F1
FUSE HOLDER
P506B
MOLEX 43160-2104
P506B
MOLEX 43160-2104
1
2
3
4
W4
14-97301-00
W4
14-97301-00
W2
14-97301-02
W2
14-97301-02
-10-
SCHEMATICS DIAGRAM

STBY
DGND
+5VD
SC
S402
SSSU122NA1
S402
SSSU122NA1
5
6
41
2
3
J401
PY301-030-100
J401
PY301-030-100
P401A
4PIN2.54-A300B
P401A
4PIN2.54-A300B
2
3
4
1
S401
SSSU122NA1
S401
SSSU122NA1
5
6
41
2
3
-11-
SCHEMATICS DIAGRAM

120deg Thermal Autoreset switch
YEL UL1015 20AWG 230mm
BLK UL1015 20AWG 230mm
RED UL1015 20AWG 230mm
0V
33.8V No load 31.3V/5.1A(Voltage between Pin9 to Pin10)
33.8V No load 31.3V/5.1A(Voltage between Pin10 to Pin11)
43.3V No load 40.6V/3.6A(Voltage between Pin8 to Pin10)
43.3V No load 40.6V/3.6A(Voltage between Pin10 to Pin12)
RED UL1672 18AWG 180mm
BLUE UL1672 18AWG 180mm
0V
33.8V No load 31.3V/5.1A(Voltage between Pin14 to Pin15)
33.8V No load 31.3V/5.1A(Voltage between Pin15 to Pin16)
43.3V No load 40.6V/3.6A(Voltage between Pin13 to Pin15)
43.3V No load 40.6V/3.6A(Voltage between Pin15 to Pin17)
0V
33.8V No load 31.3V/5.1A(Voltage between Pin19 to Pin20)
33.8V No load 31.3V/5.1A(Voltage between Pin20 to Pin21)
43.3V No load 40.6V/3.6A(Voltage between Pin18 to Pin20)
43.3V No load 40.6V/3.6A(Voltage between Pin20 to Pin22)
0V
33.8V No load 31.3V/5.1A(Voltage between Pin24 to Pin25)
33.8V No load 31.3V/5.1A(Voltage between Pin25 to Pin26)
43.3V No load 40.6V/3.6A(Voltage between Pin23 to Pin25)
43.3V No load 40.6V/3.6A(Voltage between Pin25 to Pin27)
0V
33.8V No load 31.3V/5.1A(Voltage between Pin29 to Pin30)
33.8V No load 31.3V/5.1A(Voltage between Pin30 to Pin31)
43.3V No load 40.6V/3.6A/3.5A(Voltage between Pin28 to Pin30)
43.3V No load 40.6V/3.6A(Voltage between Pin30 to Pin32)
VIO UL1015 20AWG 180mm
BLUE UL1672 18AWG 180mm
RED UL1672 18AWG 180mm
VIO UL1015 20AWG 180mm
YEL UL1015 20AWG 230mm
RED UL1015 20AWG 230mm
YEL UL1015 20AWG 200mm
RED UL1015 20AWG 200mm
BLK UL1015 20AWG 200mm
YEL UL1015 20AWG 200mm
RED UL1015 20AWG 200mm
YEL UL1015 20AWG 230mm
RED UL1015 20AWG 230mm
BLK UL1015 20AWG 230mm
YEL UL1015 20AWG 230mm
RED UL1015 20AWG 230mm
YEL UL1015 20AWG 200mm
RED UL1015 20AWG 200mm
BLK UL1015 20AWG 200mm
YEL UL1015 20AWG 200mm
RED UL1015 20AWG 200mm
YEL UL1015 20AWG 180mm
RED UL1015 20AWG 180mm
BLK UL1015 20AWG 180mm
YEL UL1015 20AWG 180mm
RED UL1015 20AWG 180mm
Thermal protector leads
are terminated with
JST SVH-21T-P1.1 and with
JST housing VHR-5N**
Primary leads are
terminated with
Molex 50539-8000
and with Molex
housing 51144-0200
Each group of secondary
leads are terminated with
JST SVH-21T-P1.1 and with
JST housing VHR-5N**
Secondary Red and Yel Alternative loads
Secondary current at maximum load
At 1/8th power condition, secondary output
is 42.5V/1.53A at the high-voltage windings
and 32.8V/2A at the low-voltage windings.
Thermal protector mounted on secondary
side but leads close to primary leads
Diameter <130mm Center filled and 10mm hole
Height <88mm
Weight <5.6Kg
Label: ┌ ┐
Toroid Audio Ltd
P/N: TI-053035 AU Iss 2
NAD: T955
└cULus logo + E115159 CE Logo ┘
Comments:
1)Primary resistance:2x1.2ohm
2)Secondary resistance:2x(0.20+0.35+0.35+0.2)ohm
3)Calculated temperature rise at 650VA
continuous load:65 deg C
4)CUL recognized to UL6500 and Can/CSA E60065-00
PIN1 to PIN3=117V
PIN4 to PIN5=117V
S4
S5
S2
S3
S1
S6
S7
All Secondary voltage are measure at 230V mains while Primary connection at 234V
t
TR901
T955 MAIN TRANSFORMER
t
TR901
T955 MAIN TRANSFORMER
1
14
3
4
5
6
7
8
9
10
11
13
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
12
P907A
MOLEX_51144-0500
P907A
MOLEX_51144-0500
1
2
3
4
5
P906A
MOLEX_51144-0500
P906A
MOLEX_51144-0500
1
2
3
4
5
P905A
MOLEX_51144-0500
P905A
MOLEX_51144-0500
1
2
3
4
5
P904A
MOLEX_51144-0500
P904A
MOLEX_51144-0500
1
2
3
4
5
P902A
MOLEX_51144-0200
P902A
MOLEX_51144-0200
1
2
P901A
MOLEX 44441-2004
P901A
MOLEX 44441-2004
1
2
3
4
P903A
MOLEX_51144-0500
P903A
MOLEX_51144-0500
1
2
3
4
5
-12-
SCHEMATICS DIAGRAM

J101
BP101
AMP BOARD - SOLDER SIDE
R164
R166
AMP BOARD - COMPONENT SIDE
R188
R123
C140
OFFSET
C157 D104
P103A
D101
R112
BUS101
R131
D129
R106 C136
C153 C109
C107 R109
R111
Q143
Q103 C105 C103
R107 R105
Q101 R113
C170
C1G1
Q144
C171
R130
D127
R1G1
C110
R114
C106
R108
Q104
Q102
C108
Q131
R104
R174
R110
C154
R198
C102
R196
R102
D106
D105
C104
Q106
R116
R119
R138
R121
D111
R124
C112
C111
C161
R1K 3
Q105
R120 C114
R117 R118
D107
R127
R128 C134
D108
IC101
C113
R126
C160
C101
ISC
R101
D130
D128
R103 D102
AGND
AGND
VSS
P101A
VPP
DGND
ACOFF
SC
PC102
R136
R115
PC101
R1H8
D131
R135
LED
R141
R139
R137 D110
C117
R140
R142
C118 Q142
C156
IC103
R1K 1R1K2 ISC ADJ.
D103
R122
RV101
W102
D109
7.5
R1H7
7.5
R125
P102A
W101
TP1
TP3
TP2
AGND
Q112
Q113
Q119 R171
R154
R149
C121
C127
Q111
D120
R1K5 R178
L104
R133
R184
Q129
R192
R186 R194
C163
R1A0
R1A2
R134 R190
R177
CB101
Q128
D119
R1A 4
R183
R180 R1K4
R193
R189
C162
Q132
Q130
R1A1
R191
R199
R185
L103
C155
R173
R132
Q141
R159
HS101
Q123
C138
R1F1
C137
R181
C129
D113 RV103
C150
R157
R155
R197
R151
Q138
Q126
Q114
R161
Q115 Q139
D118
Q125
R176
IC10 4 D132
Q146
Q140
D125
C164R1X4
R1X5
R1X3
C165
R1X6
Q127
R1X7
C131
Q145 D124
Q122
R182
R1X1
R165
C147
R160
C132
D114
C130
R1X2
R163
R172
R167
Q118
L101
P104A
R1E2
C149
R195
R187
R1E4
R1A3Q133
C135 C139
CB102
C144
R1 E1
R1A5 R1A7
C142
Q147
CB103
D123
C159
R1E5
R1H9
R1X8
C145
R1A8
R1H6
D121
RL101
D122
IC102
R1H0
L102
C148
R1E8
R1E3 R1E7
C146
C152
C158
Q137
R1H1
D126
Q136
C143
R1H3
R1H5
P105A
R1H4 R1H2
D112
Q124
R179
C133
R175
R153
D117
Q108
C124
R148 C122
R147
Q135
R1E0
R1A9
Q134 R1A6 R1E9
R1E6
C115 Q107
R145
C141
R129
C120
R1Y1
AGND
R146C123
C128
D134
R150 Q110
7.5
W103
R144
-15VA
R143 C119
+15VA
T955AMP-VM1.0
2006-08-18
Q120
C125
AGND R170 C126
D116
Q121
R169
R168
D115
Q116
C151
R156
R158
R162
Q117
7.5
W104 RV102
DC OFFSET ADJ.
D133 R152
D135
D136
-13-
PCB LAYOUT

From Trig Board
DGND
STBY
SC
+5.5V
P213B
P206B
J202
P208B
J201
P202B
J204
P204B
J203
P210B
C237
C239
AC2
Q216
AC2
PSU BOARD - SOLDER SIDE
PSU BOARD - COMPONENT SIDE
C223
CAUTION:
ATTENTION:
NAD 2006/08/18
UTILISERUNFUSIBLEDERECHANGEDEMEMETYPE
REPLACE ONLY WITH SAME TYPE FUSE AND RATING
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE
F202 F207
F204 F205 ALL FUSES ARE T6.3AL/250V
VM1.0 2006/08/18
NAD T955POW
F215 F216 F220
R216
R217
BR203
BR204
C219
C208
C209
C207
C211
C213
C221
C206
+5.5V
R267
To StandbyBoard
AC2
AC1
P212A
RELAY
TP
BR211
C210
C212
+
BUS201
C250
Q206
R213
Q208
Q207 R214 C218
R219
TH204
TH203
C215
HS204
AC2 AC1
C217 Q205
R220
R215
R221
R218
HS203
AC2 AC1
C214
C216
R224
F206
R222
R223
Q203
R207
R230
R232
TH201
Q212
HS202
R227
R233
BR202
AC2
C202
TH202
R210
AC1
R205
R211
R208
R209
Q201
R212
Q204
R206
C204
C205
Q202
R204
R202
F203 R201
C203
R203
D202
D201
F208
HS201
AC2
F210
AC1
BR201
C201 F201
T955POWER
C228
C230
C229
C231
Q213
R242
R244
Q214
C235
Q215
R240
R237
R243
R238
C234
R246
R241
R248
BR208 C233
TH207
W201
R247
F213
D204 F214 C232
W202
P207B
P205B both from Main Transformer
P201B,P202B,P203B,P204B and
P205B P201B P203B
R234
R236 F211
F209
Q211
Q221 Q222
C220
C246
C247
C248
IC201
R266
R265 HS205
C249
C222
R231
C226
C227
Q209
Q210
R225
R226
R228
R229
TH206
BR206C224
AC2 AC1
TH205
F212
BR205
D203
C225
AC2 AC1
R235
R250
HS208
C244
R255 R249 Q217
Q219 AC1 AC2
R252
C242
Q218
C245
C238
C240 TH210
R253
Q220
R257
From Display Board
C236
TH208
AC1
HS206
R245
R239
TH209
R254
AC2
C241
AC1
R251
BR209
BR210
R256
DGND
LED3
LED2
LED1
P211B
SC
LED4
LED5
STBYLED
+5.5V
HS207
AC1
BR207
R258
F219 F217
C243
R259
R260
D205
F218
P209B
-14-
PCB LAYOUT

SOFT CLIPPING
D303
T955 FRONT PANNEL DISPLAY BOARD
LED CLASSIFICATION
C
D302 1
CH 1
CH 2
AB
D301
DGND
LED2
LED3
LED4
P302A
CH 4
D305
CH 5
D306
CH 3
D304
STBYLED
+5VD
LED5
LED1
R309
R308 Q305
R325
R307
Q304
R306
R311
Q307 R326 R310
Q306
W303
VM1.0 08/18/2006
R314
Q309
R327
R313
Q308
R312
R317
Q311
R328
R316 Q310
R315
SC
BOARD
TO PSU
DISPLAY BOARD
D308
C302
RED
+5VD
GRE
Q312
Q316
Q313
Q301
R319
P301A
R318
R301
R302
R321
C301
R323
C303
C304
W301
Q315 R322
R305
Q314
Q303 R324
R304
Q302
R303
W302
- 15 -
PCB LAYOUT

C501
TR501
VM1.0 08/18/2006
T955 STANDBY BOARD
N.I.
Insert
W502
P506B
P502B
P505B
W505
W503
W504
Insert
230V
N.I.
W501 120V
RL501
D501
AC1
+5VD AC2 RELAY
P504B
TP
STANDBY BOARD
P501B
P4
P3
W502
W501
N.I.
Insert
N.I.
InsertW505
W504 N.I.
W503 Insert
-16-
PCB LAYOUT

T955 TRIGGER BOARD VM1.0 08/18/2006
TRIGGER BOARD
TO PSU BOARD
P401A
J401
S402 S401
-17-
PCB LAYOUT

1
P701B
VM1.0 08/18/2006
T955 POWER LED BOARD
POWER LED BOARD
D701
3
- 18 -
PCB LAYOUT

POWER SWITCH BOARD
S901
VM1.0 08/18/2006
T955 SWITCH BOARD
P1 P2
-19-
PCB LAYOUT

ELECTRICAL PARTS LIST
DESIGNATO DESCRIPTION PART TYPE PART NUMBER FOOTPRINT
D101 Zener Diode 15V, 1/2W 33-11500-00 DAX/.300X.080/.031
D102 Recti Diode 1N5404 33-25404-01 DAX/.600X.200/.059
D103 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D104 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D105 Switch Diode BAV21 33-40021-00 DAX/.300X.080/.031
D106 Zener Diode 2.2V, 1/2W 33-12209-00 DAX/.300X.080/.031
D107 Switch Diode BAV21 33-40021-00 DAX/.300X.080/.031
D108 Zener Diode 6.8V, 1/2W 33-16809-00 DAX/.300X.080/.031
D109 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D110 Zener Diode 24V, 1/2W 33-12400-00 DAX/.300X.080/.031
D111 Zener Diode 24V, 1/2W 33-12400-00 DAX/.300X.080/.031
D112 Zener Diode 2.7V, 1/2W 33-12709-00 DAX/.300X.080/.031
D113 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D114 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D115 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D116 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D117 Zener Diode 4.7V, 1/2W 33-14709-00 DAX/.300X.080/.031
D118 Zener Diode 4.7V, 1/2W 33-14709-00 DAX/.300X.080/.031
D119 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D120 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D121 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D122 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D123 Zener Diode 24V, 1W 33-12400-03 DAX/.300X.080/.031
D124 Switch Diode BAV21 33-40021-00 DAX/.300X.080/.031
D125 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D126 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D127 Zener Diode 3.3V, 1/2W 33-13309-00 DAX/.300X.080/.031
D128 Zener Diode 3.3V, 1/2W 33-13309-00 DAX/.300X.080/.031
D129 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D130 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D131 Zener Diode 15V, 1/2W 33-11500-00 DAX/.300X.080/.031
D132 Switch Diode BAV21 33-40021-00 DAX/.300X.080/.031
D133 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D134 LED φ3, GREEN 33-50350-00 DYL/D.200/LS.100/.039
D135 Switch Diode 1N4148 33-44148-00 DAX/.300X.080/.031
D136 LED φ3, GREEN 33-50350-00 DYL/D.200/LS.100/.039
Q101 Transistor KSC2690AYSTU 31-02690-00 TO126/90/ECB
Q102 Transistor KSA1220AYSTU 31-01220-00 TO126/90/ECB
Q103 Transistor 2SC2240-GR 31-02240-00 TO92/100/ECB
Q104 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB
Q105 Transistor MPSA92 31-00092-00 TO92/100/EBC
Q106 Transistor MPSA92 31-00092-00 TO92/100/EBC
Q107 Transistor MPSA06 31-00006-00 TO92/100/EBC
Q107 Transistor MPSA42 31-00042-00 TO92/100/EBC
Q107 Transistor 2N4401 31-04401-00 TO92/100/EBC
Q108 Transistor MPSA06 31-00006-00 TO92/100/EBC
Q108 Transistor MPSA42 31-00042-00 TO92/100/EBC
Q108 Transistor 2N4401 31-04401-00 TO92/100/EBC
Q110 Transistor 2SA1015-GR 31-01015-00 TO92/100/ECB
Q111 Transistor 2SC1815-GR 31-01815-00 TO92/100/ECB
Q112 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB
Q113 Transistor 2SC2240-GR 31-02240-00 TO92/100/ECB
Q114 Transistor 2SC2240-GR 31-02240-00 TO92/100/ECB
Q115 Transistor 2SA970-GR 31-00970-00 TO92/100/ECB
Q116 Transistor 2SC2240-GR 31-02240-00 TO92/100/ECB
AH P/N
 01-95501-10 C P/N  01-95501-20 PCB1 BOARD (AMP)
DIODE
TRANSISTOR
-20-