NAD
SER
VICE
MANUAL
C 352
STEREO
AMPLIFIER
C
352
STEREO AMPLIFIER
May 2005
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.
1
TR
I
G
AC
2
AC
1
STB
Y
I/ V
AC2
I/V
+5
.
6
V
+5.6V
AGND
AC
O
F
F
STB
Y
TRIG
ACOFF
DGND
AC1
D401
1N4148
R411
0.1
1
1
2
2
3
3
4
4
5
5
P405B
5PIN3.96-C
1
1
2
2
P901A
2PIN3.96-A300
C404
10nF
1
2
P404B
ACOUTLET
Q407
2SA970
3
1
2
SCR402
BT151-500R
+
C402
2200uF
t
1
5
10
6
2
TR401
T972
STANDBY
TANSNSFORMER
Q402
2SC1815
R412
0.1
3
4
1
2
RL401
DH1U
24VDC
TV-5
Q403
2SA1015
1
1
2
2
P403B
2PIN7.92-C
1
2
S901
PS4E-B-039
R409
1K
C401
10nF
C406
10nF
R404
22K
+
C407
22000uF
R410
100
R402
10K
R407
100
R403
22K
R414
2.2K
R401
1.5K
1
1
2
2
P402B
2PIN7.92-C
C405
10nF
1
1
2
2
3
3
4
4
P407B
4PIN3.96A100
1
1
2
2
P401B
2PIN3.96-C
R405
1K
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
P406B
10PIN2.54-C
3
1
2
SCR401
BT151-500R
R415
2.2M
D403
1N5404
~
~
+
-
BR403
KBU8D
~
~
+
-
BR401
DB104
Q404
2SA970
R416
15K
1
2
J401
JUMPER
D402
1N4148
~
~
+
-
BR402
KBU8D
HS402
70-004003-0
1
2
J402
JUMPER
+
C408
22000uF
R406
1K
R413
220
D404
1N4007
HS403
70-004003-0
Q401
2SC1815
Q405
2SC2240
Q406
2SA970
O
3
I
1
G
2
IC401
LM7805
C403
10nF
R408
1K
HS401
70-004004-0
+
C409
4.7uF
+50V
+5.6V
STBY
+5.6V
DGND
/250V
/3W
FROM
AC
INLET
TO
MAIN
TRANSFORMER
TO
POWER
SWITCH
TO
AC
OUTLET
/100V
1A/400V
/16V
/63V
/63V
/50V
/250V
/63V
/63V
FROM
FUSE
BOARD
TO
STANDBY
BOARD
/3W
TO
MAIN
BOARD
FOR
IC401
FOR
SCR401&BR402
FOR
SCR402&BR403
FOR
C
VERSION
FOR
AH
VERSION
C352
POWER
SWITCH
BOARD
POWER SUPPLY
IRIN
VOL+
TAPE2
AUX
MUTE
VOL+
CD
IROUT
VIDEO
TAPE1
VOL-
VIDEO
PREMUTE
PWLED
VOL-
SCLED
TAPE2
+12V
STBY
AUX
IROUT
TUNER
CD
DISC
+5.6V
TAPE1
IRIN
TUNER
PREMUTE
DISC
DGND
R306
470
3
4
RL302A
HRS2H-S-DC12V-A
CW
6
4
5
RV304B
RK16312A10D
20KMNX2
R361
100K
R321
1meg
C320
100nF
5
6
RL305B
HRS2H-S-DC12V-A
C312
100pF
3
4
5
RL308A
HRS2H-S-DC12V
1
2
RL305C
HRS2H-S-DC12V-A
R331
1meg
R341
3.3K
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
P301B
10PIN2.54-C
Q304
2SA1015
R349
3.6K
D303
1N4148
CW
6
4
5
RV301B
RK163121A2CA
10KAX2
+
C346
10uF
1
3
RCA301A
AV6-8.4-13
R318
470
C304
100pF
R304
470
+
C348
10uF
R363
2.2K
R336
1meg
C316
100pF
1
2
3
S301A
SPUN19K605
R346
390
1
2
RL308C
HRS2H-S-DC12V
CW
7
3
2
8
RV303B
RK16812MGA10(20KBX2)
R315
470
R325
1meg
R305
470
Q306
2SC1815
CW
3
1
2
RV302A
RK163121A2CA
10KAX2
8
9
RCA301F
AV6-8.4-13
C315
100pF
8
9
RCA303F
AV6-8.4-13
R347
180
C309
100pF
R345
390
R359
10MEG
R309
470
D307
1N4148
R356
4.7K
4
5
6
S301B
SPUN19K605
C306
100pF
R303
470
1
2
RL306C
HRS2H-S-DC12V
C328
100nF
Q305
2SC1815
+
C335
10uF
R372
1K
5
6
RL303B
HRS2H-S-DC12V-A
R332
1meg
+
C350
47uF
C325
22nF
R365
2.2K
+
C340
47uF
R342
3.3K
5
6
RCA302D
AV6-8.4-13
R3G1
10
C310
100pF
C332
950nF
R362
100K
3
4
RL301A
HRS2H-S-DC12V-A
Q307
2SA1015
C333
470pF
C351
100nF
R351
1.6K
1
2
RL302C
HRS2H-S-DC12V-A
C305
100pF
R322
1meg
R367
2.2K
5
6
RL307B
HRS2H-S-DC12V-A
R370
33
C337
100nF
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
M301
AMP MODULE
C338
100nF
C323
100nF
R320
1meg
Q302
2SK363
D301
1N4148
6
7
8
RL306B
HRS2H-S-DC12V
+
C347
10uF
C334
470pF
4
6
RCA304C
AV6-8.4-13
R326
1meg
C344
220pF
R317
470
Q301
2SK363
C3G1
100nF
C342
100nF
2
3
RCA303B
AV6-8.4-13
5
6
RL301B
HRS2H-S-DC12V-A
R311
470
C303
100pF
CW
3
1
2
RV301A
RK163121A2CA
10KAX2
R366
2.2K
3
4
RL304A
HRS2H-S-DC12V-A
R353
390
5
6
RCA304D
AV6-8.4-13
R343
820
1
3
RCA303A
AV6-8.4-13
CW
6
4
5
RV302B
RK163121A2CA
10KAX2
C319
100nF
CW
3
1
2
RV304A
RK16312A10D
20KMNX2
R316
470
3
2
1
J301A
SCJ351P00XS0B00
C349
4.7uF
R301
470
R368
2.2K
+
C339
47uF
R330
1meg
R352
1.6K
+
C345
10uF
R350
3.6K
3
4
RL307A
HRS2H-S-DC12V-A
1
2
RL301C
HRS2H-S-DC12V-A
R369
1K
1
2
RL303C
HRS2H-S-DC12V-A
C341
100nF
1
3
RCA302A
AV6-8.4-13
C308
100pF
R335
1meg
1
2
RL307C
HRS2H-S-DC12V-A
R339
8.2K
C313
100pF
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
M302
AMP MODULE
2
3
RCA301B
AV6-8.4-13
6
7
8
RL308B
HRS2H-S-DC12V
C307
100pF
R302
470
R348
180
C326
22nF
D308
1N4148
6
5
4
J301B
SCJ351P00XS0B00
R338
1meg
5
6
RCA301D
AV6-8.4-13
D306
1N4148
R355
4.7K
R360
10MEG
C317
100pF
A
-
+
+
-
RV303C
RK16812MGA10(20KBX2)
R329
1meg
R334
1meg
5
6
RL304B
HRS2H-S-DC12V-A
4
6
RCA301C
AV6-8.4-13
D305
1N4148
R319
1meg
C330
230nF
R314
470
R333
1meg
R373
10
C314
100pF
R371
10K
R328
1meg
R337
1meg
C311
100pF
R327
1meg
2
3
RCA302B
AV6-8.4-13
7
9
RCA301E
AV6-8.4-13
R357
68
4
6
RCA303C
AV6-8.4-13
D302
1N4148
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
P302B
8PIN2.54-C
C302
100pF
+
C322
100uF
C324
100nF
R358
68
1
2
RL304C
HRS2H-S-DC12V-A
7
9
RCA303E
AV6-8.4-13
8
9
RCA302F
AV6-8.4-13
C327
100nF
C301
100pF
C329
230nF
1
3
RCA304A
AV6-8.4-13
4
6
RCA302C
AV6-8.4-13
C318
100pF
3
4
RL305A
HRS2H-S-DC12V-A
R312
470
R344
820
3
4
5
RL306A
HRS2H-S-DC12V
R354
390
CW
6
1
4
5
RV303A
RK16812MGA10(20KBX2)
D304
1N4148
R364
2.2K
C343
220pF
R324
1meg
7
9
RCA302E
AV6-8.4-13
3
4
RL303A
HRS2H-S-DC12V-A
R308
470
R340
8.2K
Q308
2SC1815
R323
1meg
2
3
RCA304B
AV6-8.4-13
R313
470
5
6
RCA303D
AV6-8.4-13
R307
470
+
C336
10uF
+
C321
100uF
5
6
RL302B
HRS2H-S-DC12V-A
Q303
2SA1015
C331
950nF
R310
470
+12V
+12V
+5V
DGND
DGND
+5V
DGND
DGND
+18V
GND_EARTH
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
AGND
/1%
/1%
/1KV
/1KV
/63V
/63V
/16V
/1KV
/50V
/1%
/63V
/1KV
/1KV
/63V
/1KV
/1KV
/1KV
/50V
/50V,5%
/1%
/1KV
/1KV
/63V
/1%
/1%
/1%
/1KV
/1KV
/16V
/50V,5%
/1KV
/63V
/1%
/50V
/50V,5%
/1KV
/50V
/50V,5%
/1KV
/50V,5%
/1KV
/1KV
/50V
/1%
/1KV
/50V
/50V
/50V,5%
/50V,5%
/1KV
/50V
/1%
/1KV
/1%
/1KV
/63V
/50V
/1%
/1%
/63V
/63V
/50V,5%
/1%
/1KV
/25V
/63V
INPUT & PREAMPLIFIER