KX-AT7730RU (serv.man2) — Panasonic Telephone Service Manual (repair manual). Page 8

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8
KX-AT7730 Series
4.2.2.
LED CIRCUIT
Circuit Operation:
The LED executes dynamic lighting for the status indicators, and control is executed by the output ports P3_1, P3_6, P8_5-6, P4_5, 
P1_1-7.
Circuit Diagram
E4
Q114
4
3
5
Q108
1
4
3
2
5
D27
CO10
R139
D18
CO1
Q113
1
6
2
R137
R131
D12
ICM
RA2
D23
CO6
D5V
DG
D17
STORE
D22
CO5
R133
E1
A1
E2
R134
E3
D16
MUTE
R132
D19
CO2
A6
D28
CO11
D13
SP-PHONE
CN4
1
2
Q105
1
4
3
2
5
A5
D25
CO8
A4
D24
CO7
A3
D15
FWD/DND
A2
D26
CO9
D29
CO12
3
4
1
2
D14
CONF
R138
Q112
4
3
5
D20
CO3
D11
M.W
IC1
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Q106
1
4
3
2
5
R136
R140
A9
Q111
1
6
2
Q107
1
4
3
2
5
D21
CO4
A8
CN5
1
2
A7
R135
L[7]
L[6]
L[2]
C[2]
L[3]
L[3]
L[4]
L[5]
L[4]
L[6]
L[7]
L[5]
C[1]
L[0]
L[1]
C[0]
L[0]
C[3]
L[1]
L[2]
G
G
G
R
G
R
G
R
G
R
R
R
R
G
G
R
G
R
G
G
G
R
R
R
P3_5
P3_4
P3_3/*INT3
P2_7
P2_6
P2_5
P2_4
P2_3
P2_2
P2_1
P2_0
P3_6
P3_1
P8_6
P8_5
P8_4
P8_3
P8_2
P8_1
P8_0
P6_7
P6_6/TXD2
P6_5/CLK2
P4_5
P1_7
P1_6
P1_5
P1_4
P1_3
P1_2
P1_1
P1_0
P0_
7/DA1
P0_
6/DA0
P0_5
T_CONT1
P0_3
P0_2
P0_1
P0_0
P6_4
P6_3
P6_2
P6_1
P6_0
P5_7
P5_6
P3_2
P3_0
P4_2/VREF
MODE
HS_MUTE
P4_4/XCOUT
*RESET
P4_7/XOUT
VSS/AVSS
P4_6/XIN
VCC/AVCC
P5_4
P5_3
P5_2
P5_1
P5_0
P3_7
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