Voltage Diagrams; Control Unit - Icom IC-2720 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
1
R_V_MHz
3
S13
R.M/CALL
DS19 L1-0500TAM
Q2
XP4601
R24
4.7k
R25
10k
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
POWER POWER
L.VOL
L.SQL
R.VOL
R.SQL
R72
10k
L.DIUD
R73
10k
L.DICK
100
R74
10k
R.DIUD
R75
10k
R.DICK
HV HV
Q5
Q3
2SA1586 D3 R32 2SC4116
Q1 1SS355 22k
2SC4116
R20
4.7k
R19
1
8V
C46 C47
5
0.039 0.039
4
2
MICE
MICIN
10 - 1
76 50
P91/SEG34 P57/WKP7/SEG8
77 49
P92/SEG35 P56/WKP6/SEG7
78 48
P93/SEG36 P55/WKP5/SEG6
79 47
P94/SEG37/M P54/WKP4/SEG5
80 46
P95/SEG38/DO P53/WKP3/SEG4
81 45
P96/SEG39/CL2 P52/WKP2/SEG3
82 44
P97/SEG40/CL1 P51/WKP1/SEG2
83 43
P40/SCK32 P50/WKP0/SEG1
84 42
P41/RXD32 PA0/COM1
85 41
P42/TXD32 PA1/COM2
86 40
P43/IRQ0 PA2/COM3
87 39
AVCC PA3/COM4
88 38
PB0/AN0 VCC
IC4
89 37
HD6473847RH
PB1/AN1 V0
90 36
PB2/AN2 V1
91 35
PB3/AN3 V2
92 34
PB4/AN4 V3
93 33
PB5/AN5 VSS
94 32
PB6/AN6 CVCC
31
95
PB7/AN7 P37/AEVL
96 30
PC0/AN8 P36/AEVH
97 29
PC1/AN9 P35/TXD31
98 28
PC2/AN10 P34/RXD31
99 27
PC3/AN11 P33/SCK31
26
AVSS P32/RESO
5.04V
HV
IC2
R41 1M
S-80945CLMC-G7F
1 5
OUT CD
X1 2
VDD
EFOS4914E3 3 4
VSS NC
7.97V
Q16
2SC4116
Q15
2SC4116
IC5
TA75S558F
C48 5
1
0.1 4
3
2
R83
C50
1 15k
MICE
HV
DS4 DS10
SML-020MLT SML-020MLT
R G R G
DS5 DS11
SML-020MLT SML-020MLT
R G R G
DS6 DS12
SML-020MLT SML-020MLT
R G R G
SEG8
SEG7
SEG6
R54 1k
SEG5 l
SEG4
R50 1k
SEG3 k
SEG2
R46 1k
SEG1 j
COM1
Q6 Q8 Q10
COM2
2SC4116 2SC4116 2SC4116
COM3
COM4
R42 1k
i
SET
R.BAND
R_V_MHz
R.M/CALL
R55 1k
MONI h
R51 1k
g
R47 1k
f
Q7 Q9 Q11
2SC4116 2SC4116 2SC4116
R43 1k
e
HV
13.32V
IC3
TA78L05F
HV
O I
G
8V EP1
MICU/D EP2
EXTMIC EP3
PTT EP4
MICE EP5
MIC EP6
EP7
MICIN EP8
EP9
TDATA EP10
RDATA EP11
C23
EP12
1
EP13
MICE EP14
MICE
HV
Q12
2SC4116
Q13
2SC4116
J1
8V
MICU/D
EXTMIC
PTT
MICE to Microphone
MIC
GND
MICIN
J2
HV
TDATA
RDATA
to MAIN
GND
unit J2006
MIC
MICE