Voltage Diagram; Front-A Unit (For Ic-F1700 Series) - Icom IC-F1721/D Service Manual

SECTION 11

VOLTAGE DIAGRAM

11-1 FRONT-A UNIT (for IC-F1700 series)

DS1
L4-0013TVY
SEG54 103
SEG54
SEG55 104
SEG55
SEG56 105
SEG56
SEG57 106
SEG57
SEG58 107
SEG58
SEG59 108
SEG59
SEG60 109
SEG60
SEG61 110
SEG61
SEG62
111
SEG62
SEG63 112
SEG63
SEG64 113
SEG64
SEG65 114
SEG65
IC7
SEG66 115
SEG66
SEG67 116
SED1526F0A
SEG67
SEG68 117
SEG68
SEG69 118
SEG69
SEG70 119
SEG70
SEG71 120
SEG71
SEG72 121
SEG72
SEG73 122
SEG73
SEG74 123
SEG74
SEG75 124
SEG75
SEG76 125
SEG76
SEG77 126
SEG77
127
SEG78
128
SEG79
CP4
C67
1
C66
1
R58
1.2M
C61 C62 C63 C64 C65
0.1 0.1 0.1 0.1 0.1 C68
0.001
R59
470k
R57
1.2M
5V
8V
C18
S1
47p
Q6
DS18 DTC114TU
R43
SML-512UW
1k
C59
470p
Q7
DS17
R44 DTC114TU
SML-512MW
680
C58
470p
5V
C16 R55
5.0 V
0.01 47k
R56
C60
1k
0.1
5V
64 SEG15
SEG15
63 SEG14
IC2
SEG14
62 SEG13
SEG13 S-80942CNMC
61
SEG12
SEG12
60 SEG11 5 1
SEG11 CD OUT
59 SEG10 2
C11
SEG10
VDD
58 SEG9 0.027 4 3
SEG9
NC VSS
57 SEG8
SEG8
56 SEG7 C12
SEG7 22p
55
SEG6
SEG6 R72
54 SEG5
100k
SEG5
53 SEG4
R6
SEG4
R8
52 SEG3 1M
SEG3 X1 10
51 SEG2
CR-520
SEG2 C13
50 19.7 MHz 19.6608 MHz
SEG1
15p
SEG1 1.4 Vp-p
49 SEG0
SEG0
48 COM16
COMS
C14
47 COM15
R4 R7
COM15
68p
46 COM14 12k 12k
COM14
45
COM13
COM13
44 COM12 D1 C15
COM12
MA77 470p
43 COM11
COM11
42 COM10
COM10
R5
41 COM9
COM9 CP3 12k
5V
40
COM8
COM8
39 COM7
C10
COM7
0.1
R42 1k
CP10
R41 1k
CP11
R40 1k
CP12
D9 D10 D11
DA204U DA204U DA204U
5V 5V
FRONT-A UNIT
(for IC-F1700 series)
5V
8V
S5 S6 S7 S8 S4
R52 R51 R50 R49 R48
100k 100k 100k 100k 100k
5V
R15
HANG
100k
D12
MA2S111
R12
100k
CP1
TEMP 1 48
PB6/AN6 P70/SCK3_2
47
AFVI 2
PB7/AN7
P23
5V 3 46 TXD
AVCC P22/TXD
45
C17 4
X2 P21/RXD
0.1
44 SQL
5
X1 P20/SCK3
6 43 P87
VCL P87
42
7 FRONT CPU P86
P86
RES
8 41 P85
TEST IC3 P85
9 40 LD7
VSS P67/FTIOD1
HD64F3687
39 LD6
10
OSC2 P66/FTIOC1
11 38 LD5
OSC1 P65/FTIOB1
37
5V 12 LD4
P64/FTIOA1
VCC
13 36
R70
P50/WKP0 P60/FTIOA0
1k
V0 14 35
P51/WKP1 NMI
LA0 15 34
P61/FTIOB0
P34
16 33
LRD
P35 P62/FTIOC0
OPF0
OPF1
OPF2
R71
1k
R75
100k
R74
100k
Explanatory notes
VOLTAGE LINE
TX LINE
DIM OFF: 7.0 V
ON : 6.2 V
R33 R34
180 180
DS5 DS8
SML-311YT SML-311YT
DS6 DS9
SML-311YT SML-311YT
DS26
DS7
SML-311YT
SML-311YT
Q4
DTC114TU
Light ON: 4.9 V
Light OFF: 0 V
Q3
Q5
2SC4116
DTC114TU
R22
2.7K
DIM OFF: 0 V
ON : 4.8 V
R19
390
8V
8V
LIGT1
LIGT2
FMDA
MFDA
5V
R18
AFVI
22k
FMDA
Q2
DTC114EU
IC4
C28
0.001 TC7W04F
R16
3.3k
MFDA
Q1
D4
R14
MA2S111 CLI
100k DTA114EU
8V
CLO
PTT
C36
D8 R38
0.001
1SS355 100k
R39
47k
POSW
5V
R9
100k
VCC
VCC
C53
C69
0.1 0.001
MFDA
8V
FMDA
VCC
C38
47p
IC8
IC6 C54 TC4W53F
4.7
NJM2870
5.0 V
1 5
CTRL VIN
2
GND 4
3 5V
NB VOUT
C55 C56 C57 C30
0.1 0.01 10 0.1
5V 5V
IC9
C71
R62
AN6123MS 0.001
100
1
5
VCC OUTPUT
4 C75 R65 C79
GND
2.2k R68
2 0.1 0.1
3
DET INPUT 3.3k R67
390
C72
R63 R66
C73
10
5.6k
1M
10
11 - 1
R36 R37
180 180
DS11 DS14
SML-311YT SML-311YT
DS12 DS15
SML-311YT SML-311YT
DS13 DS16
SML-311YT SML-311YT
S9
RH70N1037E20-2781
UD 3
B
1
COM
DICK 2
A
C77 C78
47p 47p
R47 R69
10k 10k
J4
2
5V 1
4
3
P86
FMDA
6
5
P87
8
7
MFDA
NMI
10
P85 9
12
11
14
13
5V
R35
10k-B
AFVR
R20
47k
C47 D7
R21 47p MA8056
100k
D6
R73
C42
MA8056
100k 47p
TX: 1.2 V
RX: 4.8 V
R30
1k
J2
8V
1
R31 1k CLO
2
AFO
R32 1k 3
PTT to
4
MIC jack
MICE
D5 5
MIC
C51 C33
MA8056
6
GND
0.001 0.001
7
C37
47p 8
L1
10µH
C45 R60
1 47K
7.8 V J1
12
SQL 11
VCC
10
GND 9
8
MFDA 7
from
8V MAIN
6
5 unit J1
POSW
FMDA
4
3
MIC
C44 C31 C46 C35
MICE
47p 0.001 47p 47p 2
1
AFO
GND
C39
0.001
C70
R77 0.0022
R61
100k
100k
R28
C41
22k
47p
C76 R25
2
1 2.2k
1
4
C48
0.001 3
C52
5
47p
C74 R64
IC5
0.1
22k R24 R29
10k TC75S51F
10k
R26
2.2k
5V
C50
C43
4.7
C49
0.001
0.01