Kenwood NX-720H(G) Service Manual page 77

Vhf digital transceiver
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AY
SCHEMATIC DIAGRAM
DISPLAY UNIT (X54-3830-10)
D11-21,24
LCD BACKLIGHT
D11
D15
D1 9
D12
D16
D20
D13
D17
D 2 1
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
R 3 4
270
2.07V
R35
270
R 3 6
R 29
2 2 0
27 0
R37
R28
1 2 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 0X4
B30-2321-05
R:4.95V
D 2 2
T:0V
LED OFF:0V
R:5.0V
R:2.13V
LED ON:2.26V
T:1.61V
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-720H(G)/720H
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 33 7 -0 5
B3 0 -2 3 3 7 -0 5
3.77V
D6
D9
R25
3.3k
B3 0 -2 3 3 7 -0 5
B 30 -2 3 3 7 -0 5
1.89V
D7
R26
B3 0 -2 3 3 7 -0 5
4.7k
B
C
KMO1
S
A
KMO2
KMO3
S32
S31
S30
S29
S28
S27
LCD DRIVER
S26
S25
IC 1
L C 75 8 5 7 W -E
S24
S23
S22
S21
S20
S19
S18
S17
X54-383 1/1
BC
1
2
3
4
5
32
31
30
29
28
27
26
25
24
23
22
6
21
20
19
18
17
7
77

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