NAD C-352 Service manual
May 2005
NAD
SERVICE MANUAL
C 352
STEREO
C 352
STEREO
AMPLIFIER
AMPLIFIER
ALIGNMENT PROCEDURE (C352)
I. INITIAL ADJUSTMENT (No load connected)
A. OUTPUT OFFSET VOLTAGE
1. Connect a DC Millivoltmeter to L Channel speaker output terminals.
2. Turn unit “ON” and adjust VR101 (100ohms) to get a reading on IC107 Pin 1,
which must be <100mV.
3. Connect the DC Millivoltmeter to R Channel speaker output terminals and adjust
VR102 (100ohms) to get a reading on IC108 Pin 1, which must be <100mV.
B. IDLING CURRENT
1. Leave power “ON” for a minimum of 5 minutes.
2. Connect a DC Millivoltmeter to TP101 and TP102, then adjust VR103 (300ohms)
for 5-6.5mV reading on meter.
3. Connect a DC Millivoltmeter to TP103 and TP104, then adjust VR104 (300ohms)
for 5-6.5mV reading on meter.
II. FINAL ADJUSTMENT
Repeat procedure A and B for offset voltage and idling current alignment respectively.
POWER SUPPLY
TO MAIN BOARD
4PIN3.96A100
1
4
2PIN3.96-A300
TO STANDBY BOARD
10PIN2.54-C
P407B
1122334
C352 POWER SWITCH BOARD
P901A
112
2
1 2
PS4E-B-039
S901
R416
15K
11223344556677889
AC2
I/V
+5. 6V
AGND
TRIG
AC1
ACOFF
P404B
1
TO MAIN TRANSFORMER
2PIN7.92-C
P403B
112
2
FROM AC INLET
2PIN7.92-C
FROM FUSE BOARD
P406B
10
10
9
+5.6V
STBY
DGND
5PIN3.96-C
5
P405B
112233445
TO AC OUTLET
ACOUTLET
2
112
2
TO POWER SWITCH
2PIN3.96-C
P402B
P401B
112
2
DH1U 24VDC TV-5
AC2
10nF
C405
/250V
AC1
2SC1815
Q401
RL401
341
2
DGND
~
~
KBU8D
BR402
FOR AH VERSION
+-
1N4148
D402
JUMPER
1 2
J402
FOR C VERSION
1 2
JUMPER
J401
T972 STANDBY TANSNSFORMER
10nF
~
KBU8D
BR403
C406
/250V
+-
5
t
~
6
2
1
TR401
10
4.7uF
/50V
C409
1N4007
+
D404
22K
R404
2SA1015
Q403
2SC2240
100
I/V
10K
1K
3
Q405
R410
R402
R406
1K
2.2K
R409
R414
BT151-500R
1 2
SCR402
22000uF
C408
/63V
2SA970
Q406
10nF
C401
~
BR401
DB104
/100V
1A/400V
+-
10nF
1N4148
~
2200uF
C402
/16V
C403
/63V /63V
D401
+
1
LM7805
I
2
IC401
G
O
3
TRI G
2SC1815
Q402
R403
22K
2SA970
Q404
R405
1K
R401
BT151-500R
SCR401
100
R407
1.5K
3
12
R408
22000uF
1K
C407
/63V
+
+
R413
220
0.1
R412
/3W
1N5404
0.1
R411
/3W
D403
ACOFF
FOR SCR402&BR403
70-004003-0
2.2M
R415
2SA970
HS403
Q407
FOR SCR401&BR402
70-004003-0
+50V
STBY
+5.6V
HS402
STBY
70-004004-0
FOR IC401
10nF
C404
HS401
+5.6V
INPUT & PREAMPLIFIER
RCA301A
AV6-8.4-13
3
AGND
RCA301C
AV6-8.4-13
6
AGND
RCA301E
AV6-8.4-13
9
AGND
RCA302A
AV6-8.4-13
3
AGND
RCA302C
AV6-8.4-13
6
AGND
RCA302E
AV6-8.4-13
9
AGND
RCA303A
AV6-8.4-13
3
AGND
RCA303C
AV6-8.4-13
6
AGND
RCA303E
AV6-8.4-13
9
AGND
RCA301B
AV6-8.4-13
3
AGND
RCA301D
AV6-8.4-13
6
AGND
RCA301F
AV6-8.4-13
9
AGND
RCA302B
AV6-8.4-13
3
AGND
RCA302D
AV6-8.4-13
6
AGND
RCA302F
AV6-8.4-13
9
AGND
RCA303B
AV6-8.4-13
3
AGND
RCA303D
AV6-8.4-13
6
AGND
RCA303F
AV6-8.4-13
9
AGND
1
4
7
1
4
7
1
4
7
2
5
8
2
5
8
2
5
8
AGND
R301
470
R319
1meg
AGND
R303
470
R321
1meg
AGND
R305
470
R323
1meg
AGND
R307
470
R325
1meg
AGND
R309
470
R327
1meg
AGND
R311
470
R329
1meg
AGND
R313
470
R331
1meg
AGND
R315
470
R333
1meg
AGND
R317
470
R335
1meg
AGND
R3G1
10
C3G1
/63V
100nF
R302
470
R320
1meg
AGND
R304
470
R322
1meg
AGND
R306
470
R324
1meg
AGND
R308
470
R326
1meg
AGND
R310
470
R328
1meg
AGND
R312
470
R330
1meg
AGND
R314
470
R332
1meg
AGND
R316
470
R334
1meg
AGND
R318
470
R336
1meg
AGND
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
100pF
C301
C307
C311
C313
C317
C302
C308
C314
C318
/1KV
C303
/1KV
C305
/1KV
/1KV
C309
/1KV
/1KV
/1KV
C315
/1KV
/1KV
GND_EARTH
/1KV
C304
/1KV
C306
/1KV
/1KV
C310
/1KV
C312
/1KV
/1KV
C316
/1KV
/1KV
RL301A
4
HRS2H-S-DC12V-A
RL302A
4
HRS2H-S-DC12V-A
RL303A
4
HRS2H-S-DC12V-A
RL304A
4
HRS2H-S-DC12V-A
RL305A
4
HRS2H-S-DC12V-A
RL306A
4
5
HRS2H-S-DC12V
RL307A
4
HRS2H-S-DC12V-A
RL308A
4
5
HRS2H-S-DC12V
RL301B
6
HRS2H-S-DC12V-A
RL302B
6
HRS2H-S-DC12V-A
RL303B
6
HRS2H-S-DC12V-A
RL304B
6
HRS2H-S-DC12V-A
RL305B
6
HRS2H-S-DC12V-A
RL306B
8
7
HRS2H-S-DC12V
RL307B
6
HRS2H-S-DC12V-A
RL308B
8
7
HRS2H-S-DC12V
3
3
3
3
3
3
3
R337
1meg
3
C319
/63V
100nF
C320
/63V
100nF
5
5
5
5
5
6
5
6
R338
1meg
AGND
C321
+
100uF
C323
100nF
1
2
3
4
5
6
7
8
9
AMP MODULE
C322
+
100uF
C324
100nF
/16V
/63V
R341
/1%
3.3K
R339
/1%
8.2K
+
10uF
AGND
M301
1
2
3
4
5
6
7
8
9
+
10uF
/16V
/63V
R342
/1%
3.3K
R340
/1%
8.2K
R343
820
C345
/50V
C346
/50V
R344
820
R345
390
C325
22nF
31
CW
RV301A
RK163121A2CA 10KAX2
/1%
100nF
R347
180
S301A
SPUN19K605
R346
/1%
390
C326
/50V,5%
22nF
64
CW
5
RV301B
RK163121A2CA 10KAX2
C328
/1%
100nF
R348
/1%
180
S301B
SPUN19K605
/1%
/50V,5%
2
C327
/50V,5%
/1%
1
2
3
RL301C
HRS2H-S-DC12V-A
1
2
DISC
+
C347
10uF
AGND
M302
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
AMP MODULE
+12V+12V
+
C348
10uF
230nF
/50V,5%
4
5
6
230nF
D301
1N4148
/50V
/50V
C330
C329
/50V,5%
R349
3.6K
950nF
470pF
RL302C
HRS2H-S-DC12V-A
1
2
1N4148
CD
AGND
/50V,5%
R350
3.6K
C332
950nF
C334
470pF
C333
C331
D302
/50V,5%
/1KV
/50V,5%
/1KV
VOL+
5
R351
/1%
1.6K
31
CW
2
RV302A
RK163121A2CA 10KAX2
R353
/1%
390
C335
+
/50V
10uF
C337
/63V
100nF
RL303C
HRS2H-S-DC12V-A
HRS2H-S-DC12V-A
1
1
2
2
D303
1N4148
VIDEO
AUX
+
R363
2.2K
R365
2.2K
47uF
AGND AGND
Q303
2SA1015
R367
Q305
2SC1815
DGND
C336
+
/50V
10uF
C338
/63V
100nF
R352
/1%
1.6K
64
CW
RV302B
RK163121A2CA 10KAX2
R354
/1%
390
AGND
RV303A
61
CW
RK16812MGA10(20KBX2)
45
RV304A
RK16312A10D 20KMNX2
AGND
RL304C
HRS2H-S-DC12V-A
1
2
D304
1N4148
TUNER
C350
/25V
4.7uF
+
+
RK16812MGA10(20KBX2)
2.2K
RV303B
73
CW
RK16812MGA10(20KBX2)
28
64
CW
RV304B
RK16312A10D 20KMNX2
CW
3 1
RL305C
1N4148
C349
RV303C
D305
/50V
2
A
5
C339
47uF
100nF
RL306C
HRS2H-S-DC12V
1
2
D306
1N4148
TAPE2
C351
/63V
100nF
-
-
R368
2.2K
IROUT
IRIN
C340
+
/50V
47uF
C342
100nF
+
/50V
C341
/63V
R355
4.7K
AGND
HRS2H-S-DC12V-A
Q304
2SA1015
DGND
R369
Q308
2SC1815
PREMUTE
/63V
AGND
1K
1
2
RL307C
2SC1815
+5V
R356
4.7K
R357
220pF
Q306
C344
220pF
R358
68
68
C343
/1KV
RL308C
HRS2H-S-DC12V
1
2
D307
1N4148
TAPE1
R364
2.2K
R366
2.2K
VOL-
+5V
Q307
2SA1015
R371
10K
DGND
R360
10MEG
/1KV
+18V
R370
33
R372
1K
Q302
2SK363
Q301
2SK363
1N4148
PREMUTE
D308
R359
10MEG
DGND
IRIN
IROUT
SCLED
+12V
DISC
CD
VIDEO
AUX
TUNER
TAPE2
TAPE1
MUTE
STBY
PWLED
DGND
+5.6V
VOL-
VOL+
1
4
R361
100K
AGND
1
2
3
4
5
6
7
8
9
10
10PIN2.54-C
1
2
3
4
5
6
7
8
8PIN2.54-C
J301A
1
2
3
SCJ351P00XS0B00
J301B
4
5
6
SCJ351P00XS0B00
R373
10
2
5
R362
100K
AGND
RCA304A
AV6-8.4-13
3
AGND
RCA304C
AV6-8.4-13
6
AGND
P301B
1
2
3
4
5
6
7
8
9
10
P302B
1
2
3
4
5
6
7
8
RCA304B
AV6-8.4-13
3
AGND
RCA304D
AV6-8.4-13
6
AGND
POWER AMPLIFIER AND PROTECT
LOUT
LEFT CHANNEL
RCA304E
AV6-8.4-13
9
AGND
20V
+50V
6
5
4 1
SK-22F03-G7
AGND
20V
-50V
RIGHT CHANNEL
RCA304F
AV6-8.4-13
9
AGND
R OUT
-18V
P102B
1
1
2
2
3
3
4
4
4P3.96-C
P101B
10PIN2.54-C
TO STANDBY BOARD
S101
D111
D112
R287
220K
7
Q101
2SA1015
100nF
/1/2W
SCLED
/1/2W
100nF
2SC1815
8
AGND
R288
220K
AGND
+5. 6 V
+12V
1
1
2
2
3
3
4
4
5
5
+37V
6
6
7
7
8
8
9
9
10
10
3
+
2
-
IC107A
TL082BCP
C177
/63V
470nF
C101
100nF
R103
470
C103
+
R101
220K
10uF
C190
/50V
R105
AGND
100
R231
/1%
27K
R233
/1%
1K
R235
3
/1%
1K
2
R236
/1%
1K
R234
/1%
1K
R232
/1%
27K
R108
100
C192
/50V /50V
Q104
C102
100nF
R104
470
C104
+
R102
220K
10uF
C178
470nF
R116
2
-
3
+
IC108A
TL082BCP
+ 5 0 V
AGND
AC1
AC2
AGND
I/V
TRIG
ACOFF
+5.6V
STBY
+5.6V
DGND
AGND
/100V
/50V
100nF
+
10uF
AGND
+
10uF
100nF
2SA1015
/100V
/50V
/63V
10
1
1
Q103
2SC1815
C191
/50V
C147
/50V
C148
/50V
C193
Q102
AGNDAGND
AGND
R109
22K
R107
100
R110
22K
TO-92
2SA970
2SC2240
2SA1015
2SC1815
R289
56K
R111
470pF
R106
470pF
R112
R129
39K
VR101
100
Q117
2SC2240
+
Q109
2SC2240
Q111
2SC2240
R125
33
R127
33
Q113
2SA970
Q115
2SA970
+
22pF
22pF
R135
220K
R133
220K
C115
C117
R137
82
Q121
2SA1015
Q123
2SB647
/1KV
/1KV
Q125
2SD667
R139
82
Q119
2SA970
C111
/16V
22uF
C107
+
/50V
10uF
R113
10
R117
39K
R119
82
Q105
100
C105
2SA970
Q107
2SC2240
/1KV
R121
82
AGND
+18V
R123
39K
R115
10
C109
+
/50V
10uF
C113
/16V
22uF
AGND
R131
39K
R130
39K
VR102
100
Q118
2SC2240
+
Q110
2SC2240
Q112
2SC2240
R126
33
R128
33
Q114
2SA970
Q116
2SA970
+
R132
R134
220K
R138
82
Q122
2SA1015
Q124
2SB647
C116
/1KV
22pF
C118
/1KV
22pF
Q126
2SD667
R140
82
R136
220K
Q120
2SA970
39K
TO-126
e
c
2SB649
2SD669
-18V
100
R114
10
C106
/1KV
100
R290
56K
+18V
b
ce
AGND
+
10uF
R118
39K
R120
Q106
2SA970
Q108
2SC2240
R122
R124
39K
+
10uF
82
82
C110
C108
2SK369
2SK170
/50V
/50V
TO-92
C112
/16V
22uF
C114
/16V
22uF
D
G
S
13
CW
R141
1N4148
100
Q127
2SC1815
R143
13
CW
R142
1N4148
100
Q128
2SC1815
R144
47
D101
R145
/1/4W
AGND
D107
1N4148
82
47
D102
R146
/1/4W
AGND
D108
1N4148
82
2
R149
100K
R151
100K
2
R150
100K
R152
100K
R153
/1W
82
R157
/1W
2.7K
+
C119
/63V
220uF
R147
AGND
AGND
47K
330
1N4148
3.3
3.3
D105
1N4148
330
R159
D103
R161
R165
R163
/1/4W
/1/4W
Q129
2SB649
Q131
2SD669
/1/4W
/1/4W
AGND
R169
10K
R171
R173
R175
10K
R177
/1/4W
4.7
1
10K
10K
1
+
2
VR103
C123
IC101
47uF
TL431
2 3
+
C125
47uF
IC103
TL431
2 3
300
/25V
CW
1 3
R181
390
Q133
2SD669
R183
470
/25V
R179
4.7
R187
L103
33
17uH
/1/4W
470pF
+
R167
C121
/1W
2.7K
/63V
220uF
R155
/1W
82
R154
/1W
82
R158
/1W
2.7K
+
C120
/63V
220uF
R160
/1/4W
330
AGND
D104
1N4148
R162
/1/4W
3.3
AGND
Q130
2SB649 R196
R148
47K
3.3
D106
1N4148
330
R164
R166
Q132
2SD669
/1/4W
/1/4W
R170
10K
R172
R174
R176
10K
R178
/1/4W
4.7
1
10K
10K
1
+
2
VR104
C124
IC102
47uF
TL431
2 3
+
C126
47uF
IC104
TL431
2 3
300
/25V
CW
1 3
R182
390
Q134
2SD669
R184
470
/25V
R180
4.7
R188
L104
33
17uH
/1/4W
470pF
+
R168
C122
/1W
2.7K
/63V
220uF
R156
/1W
82
TO-220
2SA1837
2SC4793
TO-264
cb
eb
b
2SA1295
2SC3264
e
c
100nF
C153
/250V
220pF
220pF
C181
220pF
220pF
C182
C130
~
R185
L101
C127
C129
R186
L102
C128
17uH
17uH
R191
+50V
/1/4W
22
R193
C179
/1/4W
39
/1KV
470pF
33
Q135
2SD669
/1KV
/1KV
R189
/1KV
R195
0.068
R197
0.068
Q137
2SB649
22
R199
/1/4W
39
Q139
2SA1295
/5W
/5W
Q141
2SC3264
AGND
R201
/1/4W
22
R192
/1/4W
22
R194
C180
/1/4W
39
/1KV
470pF
33
/1KV
/1KV
/1KV
R190
Q136
2SD669
0.068
R198
0.068
Q138
2SB649
22
R200
/1/4W
39
Q140
2SA1295
/5W
/5W
Q142
2SC3264
AGND
R202
/1/4W
22
+
C154
2200uF
+-
BR101
DB104
~
AGND
+
C155
/50V /100V
2200uF
C133
/100V
100nF
AGND
D109
1N4148
R209
15K
R207
1K
C137
/100V
22nF
R211
/1W
2.7K
R213
/1W
150
+
C139
/6.3V
2200uF
AGND
AGND AGND AGND
C135
/100V
100nF
C134
/100V
100nF
AGND
D110
1N4148
AGND
R210
15K
R208
1K
C138
/100V
22nF
R212
/1W
2.7K
R214
/1W
150
AGND
+
C140
/6.3V
2200uF
AGND AGND AGND
C136
/100V
100nF
R245
/1/2W
33
R239
680
C156
/100V/50V
100nF
100nF
R241
680
+
C158
/50V
220uF
+
C159
/50V
220uF
R242
680
C157
5 6
R240
680
R246
/1/2W
33
+
R223
C176
6.8K
R217
22K
Q151
2SC1815
R215
1.2K
100nF
R216
1.2K
100nF
/25V
47uF
LOUT
/1W
C141
/100V
R218
22K
Q152
2SC1815
ROUT
/1W
C142
/100V /100V
Q155
2SD669
C160
+
/35V
220uF
C162
R243
2SC1815
R244
220uF
680
2SA1015
680
C161
Q156
Q157
+
/35V
2SB649
Q158
22pF
22pF
/1KV
C163
/1KV
AGND
47uF
R247
C164
680
10
100nF
10
100nF
R248
2SA970
R219
R220
/50V
680
Q153
/1W
C143
/1W
C144
+37V
R225
/1/4W
R221
1
L105
R224
22K
C183
/1KV
470pF
/1W
AGND
1uH
8
IC105
R226
UPC1237H
56K
7
+
2 1
C149
/16V
100uF
AGND AGNDAGND
+
C150
330uF
90°C THERMAL BREAKER
43
MUST USE UL&CSA CERTIFIED
1 2
6
5
C151
/50V
220nF
/16V
CB101
15K
D113
/1W
24V
R263
/1W
470
AGND
C145
/100V
10nF
/100V
R230
R229
/2W
/2W
220
220
RL101A
4
DH1U024VDC TV-8
RL101B
6
DH1U024VDC TV-8
D114
D115
1N4148
1N4148
R227
R228
56K
56K
AGND
3
5
R284
5.6K
/1W
RL101C
1
2
DH1U024VDC TV-8
P103B
5
5
4
4
3
3
2
2
1
1
5PIN2.54-C
FROM P102A
AGND
C352 HEADPHONE BOARD
P801A
1
2
3
4
5
5PIN2.54-A350B
TO P102B
C184
N.I.
ISC COMPARATOR
R264
R265
R266
R267
39K
TL082
C170
39K
+18V
C171
/63V
100nF
84
5
AGND
+
6
+
/50V
10uF
7
-
C172
100nF
D116
1N4148
/63V
1N4148
R277
10K
D117
1
IC106A
3
+
2
-
C173
TL082
+
R272
100K
R273
100K
+
/50V
/50V
C174
10uF
10uF
R274
R275
560K
R276
6.2K
D118
1N4148
Q163
Q154
2SC1815
R281
/2W
680
R280
6.8K
Q162
2SC1815
15V
2SD669
D123
AGND
/1%
Q159
2SC1815
/1%
Q160
2SD669
R256
10K
R257
100K
Q161
2SA1015
R258
330K
R259
100K
R282
/1/2W
100
Q164
2SC1815
/1/2W
47uF
+
C175
/25V
AGND
R260
100K
R261
220K
R262
C168
/50V
22nF
56K
R222
1
L106
+
100K
100K
+18V
R270
470K
IC106B
R269
/1W
1uH
47K
R268
R271
47K
330K
AGND AGNDAGNDAGND
+
/50V
C169
10uF
AGND AGND AGND AGND
R279
10K
R278
/1%
/1%
22K
RT101
PTH9M04BF471TS2F333
t
80°C POSISTOR
+
C166
/50V
47uF
+
C167
/50V
47uF
R254
2.2K
R255
5.1K
10nF
R249
C146
/100V
R251
/1W
22
D119
R252
/1/2W
18V
4.7K
680
R250
680
+
47uF
C165
/50V
R253
4.3K
1
2
3
4
5
4.7K
AGND
D120
1N4148
ACOFF
J801
ST-062U-090-111
1
2
3
4
BINDDING POST
C
GND_EARTH
I/V
B
TRIG
J302
SCJ349P00XS0B01
R283
10
A
I/V
TRIG
+37V
J101
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