NAD T748 Service Manual page 48

SCHEMATIC DIAGRAM (FRONT PART)
CUP12370Z-3
JK522
+5V
VCC
GND +5V
IC522
OUT OPEN
14 13 12 11
1 2 3 4
JW522
C5231 0.1
R5231 4.7
0.1
C5149
4.7
R5149
JK541
6
R5141
5
470
4
2
R5142
3
470
7
8
9
1
OPEN
C5111 0.1 C5113 OPEN
R5111 4.7 R5113 OPEN
OPEN
JW503 D5111 1SS133 D5113 OPEN
D5112 1SS133 D5114 OPEN
JW501
C5112 0.1
R5112 4.7
JK501 R5101
470
LCH
GOLD CHANGE
R5102
RCH
470
CVBS
JK502
Y_IN
C_IN
C5232 0.1
JW521
R5232 OPEN
JK521
2
3
7
8
1
R5220
4.7
MIC & OPTICAL PCB
D+5V
OPT_IN
DGND
MIC_ON
10 9 8 MIC_IN
A G N D
A+12V
5 6 7
AGND
A-12V
R5157
C5153 10K CN507
R5156 R5158
10/50V 1K C5157 1K
47P
R5151
100
R5201
2.2K
5 6 7 8
8 7 6 5
IC521
NJM2068M
1 2 3 4
4 3 2 1
C5160
R5152
150P
Q5201 100 C5161
KRC102S
R5160 10/50V
40dB ==> 58dB 10K
R5157 : 10k ==> 27k
R5160 : 10k ==> 27k
BN511 CN503
1 2 3 4 5 6 7 1 2 3
TO INPUT PCB
1 2 3
BN503
ADD
C5121 0.1
R5121 4.7
CUP12370Z-4
D5121 1SS355
D5122 1SS355
FRONT_CVBS
GND
FRONT_SC
GND
FRONT_SY
BN501
AUDIO & VIDEO PCB
CUP12370Z-5
HPL OUT
GND
HPR OUT
CN522
HP_IN
GND
CN508
HEADPHONE PCB
2-40
FRONT PCB
D+5V R5009
4.7 FIP51
OPT_IN
VFD DISPLAY
DGND
62 61 58 57 56 55 54 53 52 51 50 49 48
MIC_ON
MIC_IN
A G N D
R5045
A+12V 10
AGND
A-12V
BN507
C5041 0.1
C5042 1000P
C5043 1000P
C5044 1000P
VFD_DATA
R5044 47
47 VFD_CLK
R5043
VFD_CS
R5042 47
R5041 47 VFD_RST
R5035 4.7
RC501
R/C SENSOR
VOUT GND Vcc
1 2 3
D5057 ST+5V R5033
1SS133 4.7
Q5001
KRA102M 14 13 12
CN501 1 2
VFD_RST R5027 1K
VFD_DATA 1K
R5028
VFD_CLK
R5029 1K
VFD_CS R5030 1K
REMOTE_IN
VOL_DOWN
VOL_UP
KEY2
KEY1
GND
KEY_1
STBY+5R6V
+5VD_SYS
HP_IN
GND
POWER_ON
GND
MIC_ON
S5003
MIC_IN
+12V
SURROUND
AGND
-12V
DGND
OPT_IN
S5005
SOURCE >>
S5011
SOURCE <<
S5012
MENU
HIGH : BLUE ON
LOW : ORG ON
Q5031
KRA102M
BN512_1 BN512
S5001
Q5036
POWER
KRC102M R5031 680
Q5032
KRA102M
R5032 560
Q5033
KRC102M
HP_IN R5059 C5059
1K 0.022
GND
BN508
Q5037
KRC102M
FROM POWER TRANS
CN502
1 2 3 4 5
CUP12370Z-1
7 6 5 2 1
R5056
3.3 1%
Q5051
KTC1027Y
40V
ESD
R5053 C5115
1.2K
R5115
D5115 1SS133
1SS133
D5116
FROM INPUT B'D
1 3 5 7 9 11 13 15 17 19 21
2 4 6 8 10 12 14 16 18 20 22
11 10 9 8
3 4 5 6 7
KEY_2
S5006
LEFT
S5007
ENTER
S5008
RIGHT
S5009
UP
S5010
DOWN
CUP12370Z-2
D5032
STANDBY : ORANGE
2 COLOR LED
POWER ON : BLUE
B O
29 27 25 23 21 19 17 15 13 11 9
30 28 26 24 22 20 18 16 14 12 10
TO AMP B'D
2-41
0.1
4.7
JW502
23 25 27 29 31 33
24 26 28 30 32 34
CN414
RS232_RX
RS232_TX
MCUGND
IR OUT
REMOTE_IN
MCUGND
ST 5R6V
IPOD_RX
IPOD_TX
7 5 3 1
8 6 4 2