Voltage Diagram; Main Unit - Icom IC-4008A Service Manual

SECTION 11

VOLTAGE DIAGRAM

11-1 MAIN UNIT

C : COMMON
T : TX
R60
R : RX
100 k
SO : SQL OPEN
SC : SQL CLOSE
LON : LIGHT ON
LOF : LIGHT OFF
W4 W1
R89
1 k
C74
0.001
R90
1 k
C75
0.001
R96
100 k
R97
C92
100 k
470 P
C53
0.1
IC3
X24C01AS
C87
470 P
1 8
NC VCC
2 7
NC NC
3 6
NC SCL
4 5
VSS SDA
R68 R69
18 k 18 k
61
AN3
C54
62
0.1 AN4
63
AN5
64
AVSS
65
AVREF
66
VDD
C45 R63
67
24 P 5.6 k XT1
68
XT2
69
X1 R72 IC
CR-627 1 M 70
X1
71
X2
RESET 72
C46 RESET
EEPCK 73
24 P
P60/KR0
EEPDA 74
P61/KR1
PSC 75
P62/KR2
RXV 76
P63/KR3
TXV 77
P70/KR4
LAMPC 78
P71/KR5
MICSW 79
LON: 0 P72/KR6
LOF: 3.02 MMUTE 80
P73/KR7
Q14
DTA114EU
DS1
LN1371G
LON: 2.82 R61
LOF: 0
47
DS2
LD-BU10185J
+3 V
R98 R99 R100 R101 R102
100 k 100 k 100 k 100 k 100 k
S1
SW-149
[PTT] [DOWN] [UP] [MOD] [POWER]
R67 18 k
R71 33 k
R70 68 k
R103
100 k
TEST
R62
100 k
40
P02/SO/SB0
P01/SCK 39
P00/INT4 38
37
P53
36
P52
R105
35
P51
10 k
34
P50
33
VSS
32
P43
PTT2
31
P42
30
P41
29
P40 R64
28 18 k
VLC2
27
VLC1
26
R65
VLC0
25 18 k
BIAS
24
COM3
23
COM2
22
COM1
21 R66
COM0
18 k
R74 10 k
BATIN
C61
0.1
T: 3.04
R: 2.40
R76
100 k
IC5 S-80928ANMP
1
OUT
2
VDD
C60 3
VSS
0.1
+3 V
C80
C: 3.13
100/4 V
J4 4-175638-4
to RF unit J2
UNLK PSC
1 2
CK BATT
3 4
DATA
5
6
T+3
STB
7
8
SQL VOL
9 10
SENS R+3
11
12
AF
13 14
MOD
T: 1.45
R: 0
IC2a
NJM2100M
T: 1.48
C29
R: 0
270 P
T: 1.46
R39
R: 0
82 k
R30
8 3
68 k R2
82 k
2
1
C73
4 C1
R108
0.0033 R40
0.0015
33 k
47 k
C85
0.1
T-ID
R45
R46 C36
2.2 M
100 0.001
C: 3.10
R36
R37
C: 1.95
10 k
22 k Q7
C40
2SC4081
0.1 R38
C34
22 k
0.0047
C31 C32
0.022 0.1
R41
R35
4.7 k
5.6 k
R106 C: 1.65
10 k
T: 0
C82
R57
R: 0.86
0.047
15 k
C26
R32
470 P R33 C27
C51
680 k
6.8 k 0.1
0.1
Q12
R34
2SC4081 C28
6.8 k
0.047
RMUTE
AFON
BEEP
R79 220 k
C56
R94
0.1
220 k
R80
Q18
100 k
2SA1586
T: 0
R: 2.97
C67
2.2
R81
10 k
TXV
RXV
R+3
C: 3.82 C: 3.02
C63
5
0.1
NC C65
3 2 1
0.1
4
NC Q25
IC6 S-81230SG
C94
UMZ2N
330 P
C81 1
R78 5
GND
0.033 NC
10 k 2
4 5 6
VIN
4
3
NC
C: 2.50 VOUT
W7
C64
R77
C88 C62
22
470
470 P 0.1 D4
1SS355
C: 3.02
C89
470 P
C: 3.12
T: 0
Q1
R: 3.02
DTA144EU
R202
100
C: 3.10 C: 0
PTT2
Q2
Q3
T: 3.05 UN9215 UN5119
R: 0
C7 C91
0.1 470 P
C6
Q6
T: 1.58 R6
1
IC2b R: 0 180 k
2SK1829
NJM2100M
R4
5
82 k C3
7
R7 0.1
6
R50
C83 1.2 k
4.7 k
0.1
R9
100 k
R51 R52
C93 R118
470 k 330 k
330 P 4.7 k
T: 2.75
R: 0
R5
C24
1.2 M
0.033
T: 1.60
R31 C25
R53
R: 0
470 P
1.5 M 1 M
MMUTE
R110
C35 1 M
0.1
R43
56 k
R42
3.9 k TO RF unit
Q23
C21
W6 2SJ144
0.1
R86
C72
100 k
0.01
R87
1 M
T: 0
SC: 0
SO: 4.50
REMIN
R24 1.5 M
Q5
T,SC: 0.43
T: 3.94
C49 C48
2SA1362 SO: 1.93
SO: 3.79 R25
0.1 22
SC: 3.98 12 k 1
8
7 C17
R23 2
Q10
150
15 k
3 6
T: 0
2SC4081
SO: 2.95 T,SC: 0.49 4
5
SC: 0
SO: 0.61
R55 R56
120 1
IC9
R54
C55
C47
1.2 k NJM2070M
C50
3.3 470 P C52
0.1
2.2
T: 0 Q11
SO: 2.33
2SC4213
SC: 0
R+3
BATT
[ITA/-1] [CSA/-1]
[ITA/-1]
R302 D101 Q28
T: 1.07 T: 0.43
1 k MA2S111 R200
C57 R201
2.2 M 2SB798 R: 0 R: 0
0.1
270
R301 [ITA/-1] 3 2 1
118 k
Q101
UMZ1N
R112
Q27
33 k [ITA/-1]
C86
4 5 6
10 k [CSA/-1] 2SC4081
2.2
T: 3.70
R: 4.00
[ITA/-1]
D5
D303
MA2S111 [ITA/-1]
D101
MA2S111
1SS355 [CSA/-1]
1SS355 [CSA/-1]
[ITA/-1] [CSA/-1]
C71
T: 0.50 T: 2.68 [ITA/-1]
0.1
R: 0 R: 0 T: 1.56
R: 0
R114
R115
1.2 k [ITA/-1]
560
[CSA/-1]
3.3 k [CSA/-1]
11 - 1
C44
0.1
C90
470 P
R12
10
R49
C8
100
10
C9 C42
470 P 0.01
C: 3.12
J1
HSJ-1102-01-540
R13
4.7 k W3
C95
R10
330 P
82
C4
0.1
MC1 KUC3523
C79 R14
C10
0.1
3.3 k 470 P
T: 0
C5
R: 3.12
470 P
C11
470 P
Q29
DTC114EU
T: 3.00
R: 0
T: 2.77
SO: 0
SC: 2.77
C15
0.1
R22 33 k
R58
R88
RV-244
100 k
10 k
C59
470 P R27
100
D2
C20
1SS355
0.1
J3
HSJ1493-01-010
C18
10
SP1
C97 C96
CHASSIS
330 P 330 P
R26
10 k
W5
[CSA/-1]
R119
100 k C98
330 P
Q28
2SB798
[CSA/-1]
T: 3.70
R: 0