Kenwood NX-720 Service Manual page 77

AY
DISPLAY UNIT (X54-3830-10)
D11-21,24
LCD BACKLIGHT
D11 D15 D1 9
D12 D16 D20
D13 D17 D21
D14 D18 D24
B30-2337-05
INT SP
SP+
SP-
HOOK:4.96V
PTT:4.62V
SB:13.53V
J1 MBL:5.00V
4.82V
DM
HOOK
MIC
4.62V
ME
MIC
PTT
GND
SB
MBL
5.0V
CN1
1 SB
2
3 SP-
4
5 SP+
6
7 BLC
8 MBL
9
RLED
10 GLED
11 BLED
12 GND
13 GND
GND
14
15 EMG
16 GND
17 NC
18 50C
19 LCDDI
2 0 LCDCE
21 LCDCL
2 2 LCDDO
GND
23
2 4 GND
25 MIC
2 6 ME
27 HOOK
2 8 PTT
29 MKEY
LED OFF:0V
3 0 POWER LED ON:5.0V
POWER
LTC014EEBFS8
3.27V
TX LED
SWITCH
CONTROL
AZ
SCHEMATIC DIAGRAM
R 3 4
270
2.07V
R35
270
R 3 6 R 2 9
22 0
27 0
R37 R28
12 0
270
Q8
K T C 4 0 7 5E ( Y , G R )
LCD BACKLIGHT
SWITCH
KEY BACKLIGHT
SWITCH
Q 9
QST7
12.93V
KTC4075E(Y,GR)
R42 Q11
2.7k
D 1
SURGE
PROTECTION
R12
1 0 0
13.5V
D 2
D A 3 S 1 0 1F
SB
5.0V
R7
0
R5
1k
L 1
50C
C P 1
1 0 0 X4
B30-2321-05
R:0V
R:4.95V
D 2 2 T:4.95V
T:0V
LED OFF:0V
R:5.0V R:2.13V
LED ON:2.26V
T:1.81V T:5.0V
R 3 8
R 3 9
4.7k
4. 7k
Q3 Q6
K T C 4 07 5 E (Y , G R )
K T C 4 0 75 E (Y , G R )
R:0V
R:2.06V
T:1.76V T:0V
Q 1 0
D23
B30-2151-05
TX/BUSY
D 2 2
INDICATION
INDICATION
(BLUE)
BA
NX-720(G)/720
LCD
9.72V
5.0V
KEY BACKLIGHT
SWITCH CONTROL
D2
VOLTAGE
PROTECTION
D 2 6
KMO1
R17
KMO2
0 KMO3
H N 2S 0 3 F E
KMI1
49
KI1
KMI2 50
KI2
KMI3
51
KI3
52
KI4
5.0V
53
KI5
54
V D D
55
VL C D
56
VLCD1
57
R 2 VLCD2
R3 R 4
58
10k 1 0k
1 0 k VS S
59
T ES T
60
o SC
61
Do
62
CE
63
CL
64
DI
Q3
TX LED
SWITCH
Q6
BUSY LED
SWITCH
BB
D5-9
KEY BACKLIGHT
3.77V
D5 D8
R 2 4
3.3k
B 3 0 -2 3 37 - 05 B3 0 -2 3 3 7 -0 5
3.77V
D6 D9
R25
B 3 0 -2 3 3 7- 0 5 3.3k
B 3 0 -2 3 37 - 05
1.89V
D7
R26
4.7k
B3 0 -2 3 3 7 -0 5
B C
KMO1
A
S
KMO2
KMO3
LCD DRIVER
I C1
L C 7 5 85 7 W -E
BC
1
2
3
4
5
32
S32
31
S31
30
S30
29
S29
28
S28
27
S27
26
S26
25
S25
24
S24
23
S23
22
6
S22
21
S21
20
S20
19
S19
18
S18
17
S17
7
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