NAD C 720BEE - Page 20

IR OUT IR IN PROTECTION
C712 10n
C717 100u/16V
2
3
1
IC702 IS1U60L
RED
R739 15K
GREEN
Q702 C1815
R718 300
IR RECEIVER
R717 330
V
S
LED 701
G
+5V
PROTECTION
POWER/PROTECTION IND.
513AW
N8C320F08
N8C320F06
+5V
+12V
Q701 C1815
R719 2K2
Q703 C1815
+5V
+5V
STEREO TUNER PLL CLK1 PLL D1
R740 10K
PLL D0
D707 1N4148
PLL CE
C721 22p
RDS CLK
C722 4.7p
RDS DATA
Y701 12MHz
R705 10K
+5V
+5V
Standby
R723 4K7
+5V
R725 4K7
+12V
R724 4K7
R726 4K7
C702 10n
C701 10n
speak a
D709 GREEN
D708 GREEN
+5V
Q704 C1815
Q705 C1815
speak a OP SEL DATA
Q712 2SC1815
OP SEL CLK IP SEL DATA
R742 470
IP SEL CLK IP SEL ST
R743 10K
IP SEL DATA
IP SEL CLK
IP SEL ST2
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
CZ702 CON19
R711 10k
R712 10k
R710 10K
R713 10K
C706 0.1uF
C707 0.1uF
C708 0.1uF
C705 0.1uF
A0
1
A1
2
A2
3
Vss
4
SDA
5
SCL
6
WP
7
Vcc
8
IC705 24C64
C719 0.1uF
C723 0.1u
Standby
C704 0.1uF
R706 10K
S719 SW-PB
OP SEL ST
OP SEL DATA OP SEL CLK OP SEL ST VFD DOUT VFD DIN VFD CLK VFD STB
IP SEL DATA
IP SEL CLK
IP SEL ST
C720 10uF/50V
+5V
+5V
R709 10K
R708 10K
R707 10K
R714 10K
R715 10K
R716 10K
A
1
C
2
B
3
IC706 ENCODE
IP SEL CLK
IP SEL DATA
IP SEL ST2
VIDEO
TUNER
AUX
TAPE
CD
IR OUT IR IN
IR OUT
C718 0.1u
AUX
Q706 C1815
VIDEO
Q707 C1815
CD
Q708 C1815
DISC
Q709 C1815
TAPE
Q710 C1815
Q711 C1815
R727 4K7
R729 4K7
R731 4K7
OP SEL CLK
R733 4K7
OP SEL DATA
R735 4K7
OP SEL ST
R737 4K7
C710 10n
speak b
C711 10n
Flash
C713 10n
speak b
C714 10n
C715 10n
TUNER
C716 10n
DISC
R738 4K7
R736 4K7
R734 4K7
R732 4K7
R730 4K7
R728 4K7
D715 GREEN
D714 GREEN
D713 GREEN
R722 2.2K
D712 GREEN
D711 GREEN
D710 GREEN
STR
1
D
2
CLK
3
OE
15
VCC
16
Q1
4
Q2
5
Q3
6
Q4
7
Q5
14
Q6
13
Q7
12
Q8
11
QS
9
QS
10
GND
8
IC707 4094
PSEN
29
ALE/P
30
TXD
11
RXD
10
P27
28
P26
27
P25
26
P24
25
P23
24
P22
23
P21
22
P20
21
P00
39
P01
38
P02
37
P03
36
P04
35
P05
34
P06
33
P07
32
WR
16
RD
17
RESET
9
X2
18
X1
19
EA/VP
31
T0
14
T1
15
INT0
12
P10
1
P11
2
P12
3
P13
4
P14
5
P15
6
P16
7
P17
8
INT1
13
VCC
40
GND
20
IC704 AT89C55WD
+12V
D716 1N4148
+5
R748 8*10K
IP SEL ST
R749 10K
IP SEL ST2
RDS CLK
S715 ON/Standby S716 DISC S717 CD S718 TAPE
S711 AUX S712 FM S713 AM S714 SpeakerA
S707 SpeakerB S708 Preset down S709 Preset up S710 Tune down
S703 Tune up S704 Display S705 Memory S706 Blend
S701 FM Mute/Mode S702 video
P1
P2
P3
P4
P5
D705 1N4148
D704 1N4148
D703 1N4148
D702 1N4148
D701 1N4148
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
CZ703 CON18
-30V
-30V
KEY1
KEY2
KEY3
KEY4
+5V
VFD1
VFD2
VFD1 VFD2
KEY1
KEY2
KEY3
KEY4
P1
P2
P3
P4
P5
VFD DOUT
VFD DIN
VFD CLK
VFD STB
D718 N.I.
D719 N.I.
D717 N.I.
D720 N.I.
R750 2k
D721 N.I.
Flash
R751 2K
C725 510pF
C726 510pF
C724 510pF
R720 2.2K
R721 2.2K
1 3
2
IC708 TCM810MEND
D706 DIODE
P1
P2
P3
P4
P5
P6
P7
P8
P9
SW1
1
SW2
2
SW3
3
SW4
4
Dout
5
Din
6
IC
7
CLK
8
STB
9
KEY1
10
KEY2
11
KEY3
12
KEY4
13
Vdd
14
Seg1/KS1
15
Seg2/KS2
16
Seg3/KS3
17
Seg4/KS4
18
Seg5/KS5
19
Seg6/KS6
20
Seg7/KS7
21
Seg8/KS8
22
Seg9/KS9
23
Seg10/KS10
24
Seg11/KS11
25
Seg12/KS12
26
Seg13/Grid16
27
Seg14/Grid15
28
Seg15/Grid14
29
Seg16/Grid13
30
Seg17/Grid12
31
Seg18/Grid11
32
Vdd
33
Vee
34
Seg19/Grid10
35
Seg20/Grid9
36
Grid8
37
Grid7
38
Grid6
39
Grid5
40
Grid4
41
Grid3
42
Grid2
43
Grid1
44
Vdd
45
LED5
46
LED4
47
LED3
48
LED2
49
LED1
50
Vss
51
OSC
52
IC703 UPD16311
P10
P11
P12
P13 P14 P15 P16 P17 P18 G1 G2 G3 G4 G5 G6 G7 G8 G9 G10
+5V
+5V
C703 0.1uF
R741 47K
P1
P2
P3
P4
P5
P6
P7
P8
P9
P10
P11
P12
P13
P14
P15
P16
P17
P18
G1
G2
G3
G4
G5
G6
G7
G8
G9
G10
F1
1
F1
2
P18
4
P17
5
P16
6
P15
7
P14
8
P13
9
P12
10
P11
11
P10
12
P9
13
P8
14
P7
15
P6
16
P5
17
P4
18
P3
19
P2
20
P1
21
G10
26
G9
27
G8
28
G7
29
G6
30
G5
31
G4
32
G3
33
G2
34
G1
35
F2
37
F2
38
IC701 HNA-10SM12
+5V-30V
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
CZ703 CON18
+5V
-30V
VFD1
VFD2
VFD2
VFD1
P5
P1
P2
P3
P4
R701 10K
R702 10K
R703 10K
R704 10K
R747 10K
R746 10K
R745 10K
R744 10K
Din
Dout
VFD CLK
VFD STB
Key2
Key3
Key1
Key4
Key2
Key3
Key1
Key4
+5V
STEREO TUNER PLL CLK1 PLL D1 PLL D0 PLL CE RDS CLK RDS DATA
1 2 3 4 5 6 7 8
CZ701 CON8
ENCODE 1
ENCODE 2
ENCODE 2
ENCODE 1
Din Dout VFD CLK VFD STB Key1 Key2 Key3 Key4
PCB-3: KEY BOARD FOR Vm5.0 PCB-4: VFD BOARD KEY CONTROL CIRCUIT FOR Vm1.6 VDF DISPLAY CONTROL CIRCUIT
SCHEMATIC DIAGRAM (4/4)
- 20 -