Voltage Diagrams; Control Unit - Icom IC-2720H Service Manual

SECTION 10

VOLTAGE DIAGRAMS

10-1 CONTROL UNIT

CONTROL UNIT
S1
EVQ-VENF02
1 L.DIUD
A
2 L.DICK
B
3
NC
4
COM
S2
EVQ-VENF02
1 R.DIUD
A
2 R.DICK
B
3
NC
4
COM
R2
1k
L.VOL
R4
1k
R.VOL
R6
1k
L.SQL
R8
1k
R.SQL
S3
POWER
S4
L.BAND
S5
L_V_MHz
S6
L.M/CALL
R13
S7
4.7k
DUP
S8
LOW
S9
MONI
S10 8V
SET
S11
R.BAND
IC1
TA75S01F
S12
R_V_MHz
S13
R.M/CALL
DS19 L1-0500TAM
Q2
XP4601
R24
4.7k
R25
10k
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
POWER
L.VOL
L.SQL
R.VOL
R.SQL
R72
10k
L.DIUD
R73
10k
L.DICK
R74
10k
R.DIUD
R75
10k
R.DICK
HV HV
Q3 Q5
2SA1586 D3 R32 2SC4116
Q1 1SS355 22k
2SC4116
R20
4.7k
R19
1
8V
C46
5
1 0.039
4
3
2
MICE
MICIN
10 - 1
76
P91/SEG34 P57/WKP7/SEG8
77
P92/SEG35 P56/WKP6/SEG7
78
P93/SEG36 P55/WKP5/SEG6
79
P94/SEG37/M P54/WKP4/SEG5
80
P95/SEG38/DO P53/WKP3/SEG4
81
P96/SEG39/CL2 P52/WKP2/SEG3
82
P97/SEG40/CL1 P51/WKP1/SEG2
83
P40/SCK32 P50/WKP0/SEG1
84
P41/RXD32 PA0/COM1
85
P42/TXD32 PA1/COM2
POWER 86
P43/IRQ0 PA2/COM3
87
AVCC PA3/COM4
88
PB0/AN0 IC4
89
PB1/AN1 HD6473847RH
90
PB2/AN2
91
PB3/AN3
92
PB4/AN4
93
PB5/AN5
94
PB6/AN6 CVCC
95
PB7/AN7 P37/AEVL
96
PC0/AN8 P36/AEVH
97
PC1/AN9 P35/TXD31
98
PC2/AN10 P34/RXD31
99
PC3/AN11 P33/SCK31
100
AVSS P32/RESO
5.04V
HV
IC2
R41 1M
S-80945CLMC-G7F
1 5
OUT CD
2
X1
VDD
EFOS4914E3
3 4
VSS NC
7.97V
C47
0.039
Q15
2SC4116
C48
0.1
C50 R83
1 15k
MICE
HV
DS4
SML-020MLT
R G
DS5
SML-020MLT
R G
DS6
SML-020MLT
R G
50 SEG8
49 SEG7
48 SEG6
R54 1k
47 SEG5 l
46 SEG4
R50 1k
45 SEG3 k
44 SEG2
R46 1k
43 SEG1 j
42 COM1
Q6
41 COM2
2SC4116
40 COM3
39 COM4
38
VCC R42 1k
37 i
V0
36
V1
35
V2
34
V3
33
VSS
32
31
30 SET
29 R.BAND
28 R_V_MHz
27 R.M/CALL
R55 1k
26 MONI h
R51 1k
g
R47 1k
f
Q7
2SC4116
R43 1k
e
HV
13.32V
IC3
TA78L05F
HV
O I
G
8V
MICU/D
EXTMIC
PTT
MICE
MIC
Q16
2SC4116 MICIN
IC5
TDATA
TA75S558F
RDATA
C23
5
1
1
4
3
MICE
2
MICE
HV
DS10
SML-020MLT
R G
DS11
SML-020MLT
R G
DS12
SML-020MLT
R G
Q8 Q10 Q12
2SC4116 2SC4116 2SC4116
Q9 Q11 Q13
2SC4116 2SC4116 2SC4116
J1
EP1 8V
EP2 MICU/D
EP3 EXTMIC
EP4 PTT
EP5 MICE to Microphone
MIC
EP6
EP7 GND
EP8 MICIN
J2
EP9 HV
EP10 TDATA
EP11 RDATA
to MAIN
EP12 GND
unit J2006
EP13 MIC
EP14 MICE