NAD C 368 Service Manual
SERVICE MANUAL
1
C 368
Hybrid Digital DAC Amplifier
C 368
Hybrid Digital DAC Amplifier
SPECIFICATION
2
C368 WIRING DIAGRAM
3
C368 BLOCK DIAGRAM
4
MM IN
LINE IN1
LINE IN2
SPDIF IN
COAX 1
COAX 2
OPTO1
OPTO2
PHONO AMP
+/-12V
Bluetooth module
8670
NC7SV157
IIS3
SPI
IIC
GPIO 0-4
INT0
12V EN
12.5V
46 pin board-board socket
LDO
NC7SV157
IIS4
SPI
IIC
GPIO 5-9
INT1
DIGITAL DIGITAL
46 pin board-board socket
12.5V
LDO
STANDBY
Tact switch
IR
CS8416
Digital SENSE
E-GPO
+13.8V
E-GPO
A12V EN
+13.8V
SOURCE
Tact switchTact switch
Amber/Blue/Red
3V3S
7WV17
LED
GPIO
BT_L/R IN
OPA2348
Analog SENSE
3V3S
GPIO
HDMI IN 3
3V3S
GPIO
HDMI IN 2
HDMI IN 1
HDMI OUT
SI9573
HDMI Transceiver
HDMI card
SPDIF
RX
CS8416
MCU
TM4C1230H6PM
IIS switcher
NC7SV157X3
DC/DC AND LDO
3.3V 5.0V 1.3V
ANTENNA
MINI USB
Ethernet
USB HUB
BTM511
LAN8720
USB2514
Hub Controller
Applications
Processors
MCIMX535
ATSAM3N00A
74LV244
74LVC257A
BlueOS card
L CHR CH
+13.8V
VAUX+/-
+/-VCC
EXT_VDR
GPIO
SPEAKER A
GPIO
L CH
SPEAKER B
R CH
CLOCK
8M
3V3D
GPIO
IIS BUFFER
NC7SV157
GPIO
SN74LVC1G123
CLK Detctor
3.3VD
GPIO
IIS Main2
IIS Main3
ESD
DIODE
0
1
TS3USB3000
TFT DISPLAY
MCU
STM32F030RCT6TR
IIS
IIS BUFFER
NC7SV157
SPI
IIC
GPIO 0-11
INT 0-1
Asynchronous
SRC
SRC4382
1V8D
3V3D
3.3VS
Headphone
Audio serial
Port A
Audio serial
Port B
Digital interface
Receiver
SRC
CLOCK
24.576M
Main MCU
TI TM4C1290
SPI
I2C
GPIO
USB
3V3D
IIC
Front panel
VOLUME
MENU
IIS
MCLK
GPIO
DAC
MODULATOR
IIC
PCM1795
LOGIC BUFFER
IR ; TRIG
SPI_FPP
LCD driver
USB SWITCH
0
1
TS3USB3000
USB
FILTER
5VA
+/-12V
+/-12V
+7.5VA
GPIO
SPI_FPP
LCD driver
3.3VS
DAC MODULE
3V3D
3V3D
Plug in detect
L
R
TRIG OUT
TRIG IN
IR IN
IR OUT
+13.8V
L&R
LN
6.3AT/250V
POWER SWITCH
USB
Type A
DC/DC
TPS54040
DC/DC
XRP7675
DC/DC
TPS54327
LME49725
RS232
Digital supply
Low leakage SMPS
Digital Volume
TONE Control
NJW1194
Volume
CONTROLLER
GPIO
+/-7.5VA
3V3S
5VS
FRONT USB SUPPLY
5VD
LDO
TLV1117
LDO
TLV1117
3V3D
3V3L
+12V
ch 0
BT_L/R IN
+/-12V
ch 1
Analog supply
LDO
TLV1117
OPAMP
CLC2059
HI PASS
+/-12V
GPIO
OPAMP
CLC2059
HI PASS
+/-12V
Clipping Control
OPA1654
+13.8V
1V8D
OPAMP
CLC2059
OPAMP
CLC2059
Clipping
OPA1654
+/-12V
+/-12V
VAUX+
VAUX-
CP
Bridge control
control
+/-12V
LP1&2
LN1&2
RP1&2
RN1&2
Current sense
OPAMP
CLC2059
LOW PASS filter
HD AMP
NE5532
+/-12V
OPAMP
CLC2059
LOW PASS filter
+/-12V
LDO
KA78R12
LDO
LM337
UCD102MP
AMP
2X80W 8ohm
+/-VCC
EXT_VDR
+12V
+/-12V
13V8
+12V
-12V
EXT_VDR
HP
mute
SMPS
Bridge control
Enable
+/-VCC
GPIO
mute
Detector
mute
LDO
LM317
/LM337
LINE1/SUB1
LINE2/SUB2
Signal
Power
control
+12VR
+/-7.5VA
+12VR
+12VR
STBY
AC_DET
FAULT_DET
TRANS_TEMP
NAD C368 BLOCK DIAGRAM
VM1.0
No Power or Power shuts off
5
immediately
C368 Trouble shooting
Front panel Standby led
red light
YES
Press Standby button switch
YES
standby led blue light?
YES
Apply 1khz sinewave to RCA input of DUT
Amplifier output correct?
NO
Check Q703 Q706 circuit
Check LEDBright Control signal
Change FPP board,MDC board
standby led red light?
Check Q701Q706 circuit
Change UCD102 MODULE
NO
IPRC IPRH signal correct?
Check STB board
13.8V RIGHT?
YES
Check main board
3V3S RIGHT?
YES
YES
NONO
change PSU board
NO
Check U456
Check Q702 Q706 circuit
NO
NO
standby led turn off?
check+/-15V,+/-7.5VRight?
YES
Check LEDBright Control signal
Change FPP board,MDC board
NO
checkU461 U463 U464 U465 Circuit
change MAIN board
YES
Finish
YES
Change UCD102 MODULE
YES
checkU103 U104 U110 Circuit
change MAIN board
C368 & C388 PHONE BOARD
6
C368 & C388 MDC INTERNAL BOARD
7
C368 & C388 MDC BOARD
8
C368 & C388 AUDIO SENSE BOARD
9
C368 & C388 AUDIO SENSE INTERNAL BOARD
10
C368 & C388 FPP BOARD
11
TOP LAYER
12
C368 MAIN BOARD
C515
C514
R514
C474
C503
R510
Q507
C501
R504
C324
R1102
0610 MAIN Vm1.0
C389
D459
R4159
D458
C4130
BT Antenna
Speaker out
C506
C528
R512
RL501
R551
C541
D413
D414
R4152
R509
Q503
Q505
C502
R507
Q506
C500
R503
C323
R150
R393
L OUT
R508
Q502
Q504
C504
R511
C505
R505
D104
R391
C154
R390
BT Antenna
BT Antenna
Q509
R506
R474
+12VR
R169
L IN-
1
2
D105
L IN+
J502
C517
R1100
Q125
TP100
Q126
R172
R170
R181
C171
C170
R179
D106
R IN+
C432
TP101
VCL Bias
R167
R180
R173
C516
R513
R515
C512
C513
C427
R416
U403
R408
R4161
R432
C407
R400
R436
C403
R441
R426
R435
C421
C193
D401
R440
U105
R188
R178
C179
C321
R IN-
35
36
D807
D804
R832
C804
J800
0610 USB Vm1.0
C509
RL500
R168
Q102
R152
R475
(+35V_AMP)
R151
C155
Q456
Q455
TP102
Q101
R164
C169
+13.8V
R4163
R4162
L500
J503
Q508
C1100
C496
R1104
J500
JK400
J401
G GL G R
0610 HP Vm1.0
U400
R410
R1101
R409
C507
C510
R550
R171
R183
R166
R182
R OUT
C379
S101
J402
R4150
R4157
R523
J504
C425
C527
U407
C539
C430
C406
R405
R417
R433
C446
R401
R412
R411
R427
C405
G G
C429
RL400
R439
Q402
Q401
R190
Q107
VCL+
C133
Q106
R189
C180
C382
R184
C322
C521
R489
C520
D506
J807
C404
R406
U402
R414
C409
U401
R G L
R102
R100
R194
VCL-
R382
R198
R488
Q501
R428
C381
C540
R193
R185
R403 R404
J400
Q412
C131
-18V
+18V
GND
RX
TX
3V3
L606
C132
U110
J408
C611
R415
C402
R413
C188
R429
RL100
R195
C523
0610
RS232 BOARD
Vm1.0
R651
C658
R520
R4156
D461
C452
C525
C400
R425
C431
C426
R418
C408
R175
R159
R162
R196
R491
R490
J303
R521
C609
R522
C613
U607
R650
RL401
C524
R494
C401
R157
R423
R420
U406
R4132
R419
R421
R4131
C187
C172
R160
C173
C176
U104
C174
C175
R177
R161
U463
R163
-12V
C130
H458
R197
C458
R101
R383
R199
C522
R392
H452
D416
D415
R4153
C4135
J604
C
4
4
8
J404
C
1
C610
9
5
R4146
C612
C449
D428
D427
J403
D408
Q409
R4147
R451
C447
R438
R448
R437
D407
C526
R496
C162
R484
C420
R156
R158
C163
C479
C489
U460
H455
Q407
R453
D406
R446
R449
R447
Q404
Q406
Q408
R452
R450
D405
D404
R445
C433
R443
R498
C150
C160
C165
C164
C128
C129
U103
C153
C152
C161
C478
C477
R4100
U465
J304
+ G G -
R4138 R4139
U410
R4142
R4140
R4145
R4141
C4132
U411
R4144
R4143
J100
C532
C533
Q405
R531
C151
H457
U461
C487
C468
C490
3V3S
D457
C4131
C456
R539
R540
J407
C126
C534
C122
C535
C123
C127
Analog sense
R147
R148
R532
+7.5VA
-7.5VA
+12V
C166
CON301
R4126
1
2
C459
C438
C441
C461
R4101
C488
+12V
C486
C493
C495
C481
R464
FB455
13V8
C483
C482
L457
L456
C469
R467
C4115
R463
R465
U456
R466
R462
R459
C4107
C471
R460
C455
49
50
PS_DATA
PS_SCK
PS_CS
J101
C538
C113
C537
C112
C536
R535
R111
R110
R537
R538
J103
1
J105
Audio_SEN
-12V
R486
C440
C434
U408
R4130
C480
5VD
C457
C4104
R458
R457
U464
L455
5V_EN
C436
R4129
R4125
U462
C4106
R461
C4129
U455
C4111
C4112
3V3D_EN
R455
Q411
VA_CLK
VA_CS
VA_DATA
J300
R937
R936
R935
C300
R300
D307
Q300
PHONO MODULE
C367
C439
R487
U409
R4128
R4136
C445
H456 H451
U904
R934
R938
C328
C931
U903
R933
C325
C314
TPG300
R343
R332
R339
Q301
R939
C332
C342
1V8
R341
C345
U308
C346
L301
C366
C435
R363
C365
R4127
R4135
R4134
C444
C443
A-A:
C485
C352
3V3D
C4113
Q457
R456
R4104
Q458
J405
R342
A-A:
R336
R337
R362
R338
C353
R397
U311
R4105
C392
C473
R361
R326
R360
R325
R356
R357
R358
R324
OP300
C320
C319
C311
C312
C930
C330
C327
C316
C313
C315
R912
R907
L900
R346
R347
C334
C343
U301
R345
R344
R348
R340
R352
C347
MCLK
IIS_SCLK
U306
R353
Q304
C339
R4133
C442
P300
Q303
L302
R305
C391
C349
R319
R335
R375
R374
R349
U309
C344
C370
U302
C369
R396
C362
C361
R351
R350
D303
2 1
R312
R320
R321
R322
R323
OP301
R911
R904
R901
R900
R932
C
C914
R908
IIS_SDO
IIS_LRCK
C326
U305
R313
R931
U902
C913
1
0
9
U901
C902
3
0
9
4
C
0
0
0
9
9
C
C
U900
R914
R913
R916
R918
R905
R903
R915
R917
C932
R910
R909
D418
D417
C476
R4154
CON300
FB300
R316
R314
R315
C336
C337
U300
D302
D306
R309
C308
R308
C340
C350
U303
C351
U304
R359
R373
R372
D304
D305
U310
R371
J406
0610 MAIN Vm1.1
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