NAD C 368 User manual

Hybrid Digital DAC Amplifier
Hybrid Digital DAC Amplifier SERVICE MANUAL
C 368
C 368
1

SPECIFICATION
2

C368 WIRING DIAGRAM
3

Signal
Power
control
Main MCU
NAD C368 BLOCK DIAGRAM
SI9573
HDMI Transceiver
MCU
TM4C1230H6PM
DC/DC AND LDO
3.3V 5.0V 1.3V
HDMI IN 3
HDMI IN 2
HDMI IN 1
HDMI OUT
IIS switcher
NC7SV157X3
46 pin board-board socket
IIS3
INT0
IIC
GPIO 0-4
SPI
12V EN
LDO
46 pin board-board socket
IIS4
INT1
IIC
GPIO 5-9
SPI
A12V EN
IIS BUFFER
NC7SV157
ch 0
ch 1
HDMI card
SPI
IIC
GPIO 0-11
INT 0-1
ESD
DIODE
E-GPO
E-GPO
DIGITAL DIGITAL
LDO
12.5V
IIS Main3
+13.8V
+13.8V
3.3VD
12.5V
POWER SWITCH
LN
6.3AT/250V
SMPS
LOGIC BUFFER
TRIG OUT
TRIG IN
IR IN
GPIO
IR ; TRIG
Lowleakage SMPS
GPIO
SPI_FPP
CS8416
Plug in detect
Front panel
TFT DISPLAY
STANDBY
IR
VOLUME
LED
BlueOS card
SPDIF
RX
ANTENNA
MINI USB
Ethernet
USB HUB
Applications
Processors
MCIMX535
USB2514
Hub Controller
74LVC257A
LAN8720
BTM511
NC7SV157
74LV244
ATSAM3N00A
MM IN
PHONO AMP
LINE IN1
OPAMP
CLC2059
mute LINE1/SUB1
OPAMP
CLC2059
HD AMP
mute
HP
Tact switch
Headphone
SOURCE
Tact switchTact switch
RS232
COAX 1
COAX 2
OPTO1
OPTO2
SPDIF IN
IR OUT
Asynchronous
SRC
SRC4382
NC7SV157
Audio serial
Port A
Audio serial
Port B
Digital interface
Receiver
SRC
CLOCK
24.576M
DAC MODULE
PCM1795
NJW1194
Volume
Digital Volume
TONE Control
AMP
LP1&2
LN1&2
RP1&2
RN1&2
SPEAKER A
2X80W 8ohm
Clipping
OPA1654
CP
Clipping Control
OPA1654
+/-VCC
Current sense
EXT_VDR
3V3D
IIC
IIS Main2
IIS
L&R
LME49725
GPIO
SPI
I2C
GPIO
USB
+7.5VA
3V3D
1V8D
+/-7.5VA
DAC
MODULATOR FILTER
L
R
MCLK
OPAMP
LOW PASS filter
SPEAKER B L CHR CH
L CH
R CH
+12VR
+12VR
+12V
mute
OPAMP
LOW PASS filter
LINE2/SUB2
CLC2059
3.3VS
MCU
STM32F030RCT6TR
LCD driver
+/-VCC
+/-VCC
VAUX+/-
LDO
KA78R12
DC/DC
TPS54327
LDO
LDO
3V3D1V8D
Digital supply
+13.8V
TLV1117
5VD
3.3VSLDO
LM317
/LM337+/-7.5VA
TI TM4C1290
SPI_FPP
LCD driver
+13.8V
TLV1117
IIC
DC/DC
TPS54040
3V3S
control
OPAMP
HI PASS
CLC2059
OPAMP
HI PASS
CLC2059
+12V
AC_DET
GPIO
GPIO
GPIO
GPIO
CONTROLLER
STBY
EXT_VDR
EXT_VDR
UCD102MP
+/-12V
+/-12V
+/-12V
+/-12V
+/-12V
Amber/Blue/Red
Analog supply
+/-12V
Enable
Detector
Bluetooth module
8670
IIS
3V3S
CLC2059
VAUX+
-12V
LDO
LM337
+12V
13V8 +12VR
GPIO
5VA
3V3D
+/-12V+/-12V
7WV17
IIS BUFFER
NC7SV157
3V3D
GPIO
MENU
Type A
USB
USB SWITCH
TS3USB3000
GPIO
0
1
TS3USB3000
0
1
USB
3V3D
+/-12V
+/-12V
+/-12V
LDO
TLV1117
3V3L
DC/DC
XRP7675
5VS
FRONT USB SUPPLY
BT_L/R IN
BT_L/R IN
+/-12V
Analog SENSE
3V3S
GPIO
FAULT_DET
TRANS_TEMP
VAUX-
+13.8V
LINE IN2
CLOCK
8M
Digital SENSE
3V3S
GPIO
CS8416
OPA2348
NE5532
SN74LVC1G123
GPIO
CLK Detctor
VM1.0
Bridge control
Bridge control
C368 BLOCK DIAGRAM
4

YES
Check STB board
Check main board
13.8V RIGHT?
NONO
Frontpanel Standbyled
No Power or Power shuts off
immediately
3V3S RIGHT?
NO Check U456
YES
Check Q703 Q706 circuit
Change FPP board,MDC board
YES
NO
Press Standby button switch
standby led blue light?
YES
change PSU board
Check LEDBright Control signal
YES
standby led turn off?
standby led red light?
YES
NO
red light
YES Check Q702 Q706 circuit
Change FPP board,MDC board
Check LEDBright Control signal
Check Q701Q706 circuit
Change UCD102 MODULE
Finish
Apply 1khz sinewave to RCA input of DUT
Amplifier output correct?
YES
NO IPRC IPRH signal correct?
YES
Change UCD102 MODULE
check+/-15V,+/-7.5VRight?
NO checkU461 U463 U464 U465 Circuit NO change MAIN board
YES
checkU103 U104 U110 Circuit
change MAIN board
C368 Trouble shooting
5

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