![background image](http://html.mh-extra.com/html/icom/ic-7400/ic-7400_service-manual_612265085.webp)
12 - 2
CP328
P14
P15
P16
P17
P41
P42
P21
PB1A
PB1B
MDNK
MUPK
SRES
-8V
P67
P66
-8V
PB0
PC2
PB1
PB2
PB3
PB4
PB5
PB6
PB7
PC2
DASH
DOT
P54
P53
P52
P51
P50
KIO
CP348
CP303
CP304
CP305
5VL
5VL
8V
P14
P42
P41
P15
P16
P17
P21
PB1A
PB1B
MDNK
MUPK
SRES
P67
P66
-8V
C305
12p
L303
D818HN-1107
C304
0.047
CP306
CP307
CP308
CP309
CP310
CP311
CP312
CP313
CP314
CP315
CP317
CP318
CP316
Q304
2SC3647
R305
3.3k
R304
3.3k
L302
100
µ
D301
RD3.0M
Q303
2SC3647
C303
47
R303
220
Q301
2SC4081
Q302
2SB1201
C302
10
C307
10
R302
33k
R306
NTCCM20123JH472KCT
R301
6.8k
P14
CP329
CP330
CP331
CP332
CP333
CP334
CP335
CP336
CP338
CP339
CP340
CP341
CP342
CP343
CP344
CP345
CP337
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
DASH
DOT
P54
P53
P52
P51
P50
KIO
CP346
CP347
PB2A
PB2B
PC2
P16
1
2
3
IC101a
MC14071BFEL
4
6
5
IC102b
µ
PD4030BG
C113
0.001
R112
47k
IC102d
µ
PD4030BG
12
13
11
C114
0.001
R113
15k
IC102c
µ
PD4030BG
9
10
C112
0.001
R111
15k
8
IC102a
µ
PD4030BG
1
2
3
14
7
5
6
4
IC101b
P21
11
13
12
R108 1M
R106
220k
R107
100k
R105
100k
C102
0.001
IC101d
8
10
9
R104 1M
R102
220k
R103
100k
C101
0.001
IC101c
R101
100k
P17
P15
C111
0.1
C5
0.0047
R8
1k
R7
EVU-FLAE02B14
PB4
C6
0.0047
R9
EVU-FLAE02B14
R10
1k
PB5
[MIC
GAIN]
[RF
PWR]
C7
0.0047
R11
EVU-FLAE02B14
R12
1k
PB6
[CW
PITCH]
C8
0.0047
R13
EVU-FLAE02B14
R14
1k
PB7
[KEY
SPEED]
L301
100
µ
PB3
PB2
C2
0.0047
C1
0.0047
R3
1k
R2
1k
R1 RV-308
[NOTCH]
[NR]
NR/NOTCH
PB1
PB0
C4
0.0047
C3
0.0047
R6
-8V
8V
5V
1k
R5
1k
R4 RV-308
[AF]
[RF]
[AF/RF]
P67
S7
SKQDPA
[LOCK/SPCH]
P66
S6
SKQDPA
[CALL]
P54
S5
SKQDPA
[A/NOTCH]
P53
S4
SKQDPA
[NR]
P52
S3
SKQDPA
[ANT]
P51
S2
SKQDPA
[TUNER]
P50
S1
SKQDPA
[TRANSMIT]
S11
SKQDPA
[MONITOR]
S10
SKQDPA
[VOX/
BK-IN]
R18 15k
S9
SKQDPA
[NB]
R17 4.7k
S8
SKQDPA
[P.AMP/
ATT]
R16 2.2k
R15
6.8k
C9
0.1
KI0
C401
0.1
C402
470
R403
8.2k
INVIN
V+
SI
CD
GND
CT
ES
CS
1
2
3
4
8
7
6
5
R402
1
R401
1
R5
10k
R4
10k
R3
10k
R2
10k
R7
10k
R6
10k
IC401
NJM2360M
C405
270p
C403
0.1
C404
220
L402
D10F-A814AY-221K
C407
0.1
L401
L601
SLF7032T-101MR45-2
D10F-A814AY-681K
C406
220
D402
SB10-05PCP
L403
D10F-A814AY-681K
C409
10
C408
0.1
CP721
CP720
CP719
CP718
CP717
CP716
CP715
CP714
CP713
CP712
CP711
CP710
SPS
PAFO
PAFE
LFMD
LMFD
SRES
PWRK
SQL
SEND
MICE
MIC
-8V_
5VL
5VL
8V
14V
S601 SKQDPA
[POWER]
CP724
CP723
CP722
CP708
CP707
CP705
CP706
CP704
CP702
CP701
R571
22k
C572 0.1
IC571
TC4S71F
1
2
4
3
5
C571
0.47
R576 100k
CP301
CP302
CP571
CP572 CP574
CP573 CP576
CP505
CP504
CP503
CP502
CP501
CP523
CP522
CP521
PAFO
MMICE
GND
MSEND
SQLS
MUD
M8V
MIC
GND
GND
GND
PB2B
PB2A
5VL
GND
GND
GND
GND
GND
GND
GND
RDN
5VL
RUP
J502
J501
J507
J508
J601
J301
J302
J303
KI2
KI3
KI4
KI5
KI6
KI7
XFCK
MPWK
MPRK
TXD
RXD
LOCD
SPLD
FIND
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
5VL
LDV
CP6
CP7
CP8
CP9
CP10
CP5
CP4
CP3
CP2
CP1
F2K
F1K
J604
CP604
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
CP8
CP7
CP6
CP5
CP4
CP3
CP2
CP1
CP9
CP10
CP11
CP12
CP13
CP14
CP15
CP16
KI2
R1
6.8k
C1
0.1
R4
2.2k
R7
4.7k
R11
15k
KI3
R2
6.8k
R10
15k
C2
0.1
R5
2.2k
R8
4.7k
R9
4.7k
R6
2.2k
C3
0.1
R12
15k
R3
6.8k
KI4
R16
2.2k
R17
4.7k
C4
0.1
R18
15k
R15
6.8k
KI5
DS5
CL-220YG
D54
CL-220YG
DS3
CL-220HR
FIND
SPLD
LOCD
MPRK
DS2
CL-220YG
RXD
DS1
CL-220HR
TXD
MPWK
XFCK
R19
6.8k
KI6
C5
0.1
R20
2.2k
R20
2.2k
R21
4.7k
R23
6.8k
C7
0.1
KI7
R24
2.2k
R25
4.7k
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
F3K
F4K
MNUK
F5K
SSBK
FILK
AFMK
MODE BOARD
TEN-KEY BOARD
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP8 CP7 CP6 CP5
CP1 CP2 CP3 CP4
L4 100
µ
L3 100
µ
L6 100
µ
L1 100
µ
C7 100p
C6 0.0047
C5 0.0047
C4 0.0047
C3 0.0047
C2 0.0047
8
1
2
3
4
5
6
7
J1
FM214-BSS(P)
C1
0.0047
MIC BOARD
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP5 CP4 CP3 CP2 CP1
L2
HF50ACC322513-B
L1
HF50ACC322513-B
R2 180
R1 180
C3
0.0047
R3
1k
C2
0.0047
C5
0.0047
C4
0.0047
C551
0.1
C1019
0.022
C552
0.0047
C553
0.0047
C554
0.0047
C555
0.0047
C556
0.0047
C557
0.0047
C1
0.0047
J1
HLJ5305-01-4090
J2
HLJ7000-01-3010
PHONE BOARD
PAFE
PAFO
PAFE
PHNL
DASH
DOT
to
MAIN
DIAL
MIC
M8V
MUD
SQLS
MSEND
GND
MMICE
PAFO
CP1
CP2
CP3
CP4
CP5
5VL
PB1A
PB1B
MCHA
MCHB
A
B
COM
S1
TP90N00E20-22.5-2494
[M-CH]
[PBT]
PBT BOARD
RUP
5VL
RDN
CP1
CP2
CP3
COM
NC
B
A
1
3
2
A
B
COM
PBT2
PBT1
PB2A
PB2B
MCHA
MCHB
GND
GND
GND
PB1A
PB1B
A
S2
TP90D96E20-30F-2178-1
5
B
6
COM
4
1
3
2
1
2
3
4
S1
EVQ-VCJF0324B
RIT BOARD
5VL
PB1A
PB1B
MCHA
MCHB
PB1A
PB1B
MCHA
MCHB
PB2A
PB2B
GND
GND
GND
RUP
5VL
RDN
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
5VL
PB1A
PB1B
MCHA
MCHB
RUP
5VL
RDN
PB2A
PB2B
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
to
MAIN
unit
J1334
J1
J1
J3
J2
GND
GND
GND
GND
PAFE
PAFO
PAFE
PHNL
DASH
DOT
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PB2A
PB2B
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
PB2A
PB2B
GND
GND
GND
S-LOGIC BOARD
J1
J1
DASH
DOT
RDN
RUP
SRES
MUP
MDN
RDN
RUP
CP603
MUP
MDN
CP605
5VL
PAFO
PAFE
PAFE
GND
PHNL
DASH
DOT
GND
GND
GND
CP703
PC2
P42
P41
D573
DA221
C306
1
CP325
14
7
C115 0.1
CFL
DS1002
NC
NC
F2
F1
F3
F4
F5
MENU
SSB
CW/
RTTY
CWRK
AM/
FM
FILTER
W19
W20
W25
W27
W26
W24
W22
W21
F-INP
7
3.5
1.8
SPLIT
18
14
10
A/B
28
24
21
TS
144
50
GENE
MP-R
MP-W
XFC
RIT
TX
CLEAR
MW
M-CL
V/M
CALL
PAFE
PAFO
PAFE
GND
PHNL
DASH
DOT
GND
GND
GND
CFL+
CFL-
R404 1.5k
CFL+
CFL-
[PHONES]
[ELEC-KEY]
[RIT/ TX]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
IC1009
HD61202UFS
ADC
M
VCC
V4R
V3R
V2R
V1R
VEE2
Y64
Y63
Y62
Y61
Y60
Y59
Y58
Y57
Y56
Y55
Y54
Y53
Y52
Y51
Y50
Y49
Y48
Y47
Y46
Y45
Y44
Y43
Y42
Y41
Y40
Y39
Y38
Y37
Y36
Y35
Y34
Y33
Y32
Y31
Y30
Y29
Y28
Y27
Y26
Y25
Y24
Y23
Y22
Y21
Y20
Y19
Y18
Y17
Y16
Y15
Y14
Y13
Y12
Y11
Y10
Y9
Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
VEE1
V1L
V2L
V3L
V4L
GND
DB0
DB1
Z57
Z56
Z55
Z54
Z53
Z52
Z51
Z50
Z49
Z48
Z47
Z46
Z45
Z44
Z43
Z42
Z41
Z40
Z39
Z38
Z37
Z36
Z35
Z34
Z33
Z32
Z31
Z30
Z29
Z28
Z27
Z26
Z25
Z24
Z23
Z22
Z21
Z20
Z19
Z18
Z17
Z16
Z15
Z14
Z13
Z12
Z11
Z10
Z9
Z8
Z7
Z6
Z5
Z4
Z3
Z2
Z1
V2
V1
V2
V3
V4
DB2
DB3
DB4
DB5
DB6
DB7
NC
NC
NC
CS3
CS2
CS1
RST
R/W
D/I
CL
FAI2
FAI1
E
FRM
FRM
LE2
CL
LA0
LRES
LD7
LD6
LD5
LD4
LD3
LD2
LD1
LD0
V4
V3
V2
V1
V2
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
DB6
83
81
82
DB7
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
NC
33
31
32
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
NC
1
2
3
IC1008
HD61202UFS
DB5
ADC
M
VCC
DB4
V4R
V3R
V2R
V1R
VEE2
Y64
Y63
Y62
Y61
Y60
Y59
Y58
Y57
Y56
Y55
Y54
Y53
Y52
Y51
Y50
Y49
Y48
Y47
Y46
Y45
Y44
Y43
Y41
Y42
Y40
Y39
Y38
Y37
Y36
Y35
Y34
Y33
Y32
Y31
Y30
Y29
Y28
Y27
Y26
Y25
Y24
Y23
Y21
Y22
Y20
Y19
Y18
Y17
Y16
Y15
Y14
Y13
Y12
Y11
Y10
Y9
Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
VEE1
V1L
V2L
V3L
V4L
GND
DB0
DB1
DB2
DB3
NC
CS3
CS2
CS1
RST
R/W
D/I
CL
FAI2
FAI1
E
FRM
Y57
Y56
Y55
Y54
Y53
Y52
Y51
Y50
Y49
Y48
Y47
Y46
Y45
Y44
Y43
Y42
Y41
Y40
Y39
Y38
Y37
Y36
Y35
Y34
Y33
Y32
Y31
Y30
Y29
Y28
Y27
Y26
Y25
Y24
Y23
Y22
Y21
Y20
Y19
Y18
Y17
Y16
Y15
Y14
Y13
Y12
Y11
Y10
Y9
Y8
Y7
Y6
Y5
Y4
Y3
Y2
Y1
V4
V3
V2
V2
V1
M
C1014 0.1
LD0
5VL
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LRES
LA0
CL
LE1
FRM
V2
V1
V2
V3
V4
M
C1013
0.1
FAI1
FAI2
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
51
52
64
100
99
98
97
65
66
67
68
69
70
71
74
80
72
96
95
94
93
92
91
90
89
88
87
86
85
84
83
81
82
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
31
32
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
1
2
3
IC1007
HD61203UFS
73
79
78
77
51
75
76
53
54
55
56
57
58
59
60
61
62
63
52
V2
V6
V5
V2
V1
X22
X21
X20
X19
X18
X17
X16
X15
X14
X13
X12
X11
X10
X9
X8
X7
X6
X5
X4
X3
X2
X1
VEE
V6L
V5L
V2L
V1L
VCC
DL
FS
DS1
DS2
C
NC
R
NC
CR
STB
SHL
GND
NC
MS
FAI1
FAI2
NC
FRM
M
NC
FCS
DR
CL1
CL2
TH
V1R
V2R
V5R
V6R
VEE
X64
X63
X62
X61
X60
X59
X58
X57
X56
X55
X54
X53
X52
X51
X50
X49
X48
X47
X46
X45
X44
X43
X42
X41
X40
X39
X38
X37
X36
X35
X34
X33
X32
X31
X30
X29
X28
X27
X26
X25
X24
X23
M
CL
D
C1012
0.1
X17
X16
X15
X14
X13
X12
X11
X10
X9
X8
X7
X6
X5
X4
X3
X2
X1
V2
V6
V5
V2
V1
91
92
93
94
95
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
189
190
191
192
193
194
195
196
197
198
199
200
201
203
204
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
SEG41
SEG42
SEG43
SEG44
SEG45
SEG46
SEG47
SEG48
SEG49
SEG50
SEG51
SEG52
SEG53
SEG54
SEG55
SEG56
SEG57
SEG58
SEG59
SEG60
SEG61
SEG62
SEG63
SEG64
SEG65
SEG66
SEG67
SEG68
SEG69
SEG70
SEG71
SEG72
SEG73
SEG74
SEG75
SEG76
SEG77
SEG78
SEG79
SEG80
SEG81
SEG82
SEG83
SEG84
SEG85
SEG86
SEG87
SEG88
SEG89
SEG90
SEG91
SEG92
SEG93
SEG94
SEG95
SEG96
SEG97
SEG98
SEG99
SEG100
SEG101
SEG102
SEG103
SEG104
SEG105
SEG106
SEG107
SEG108
SEG109
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM9
COM10
COM11
COM12
COM13
COM14
COM15
COM16
COM17
ACOM1
ACOM3
ACOM4
ACOM5
ACOM6
ACOM7
ACOM8
ACOM7
ACOM6
ACOM5
ASEG1
ASEG2
ASEG3
ASEG4
ASEG5
ASEG6
ASEG7
ASEG8
ASEG9
ASEG10
ASEG11
ASEG12
ASEG13
ASEG14
ASEG15
ASEG16
ASEG17
ASEG18
96
187
188
SEG110
SEG111
SEG112
SEG113
SEG114
202
ASEG19
ASEG20
ASEG21
ASEG22
ASEG23
ASEG24
ASEG25
ASEG26
ASEG27
ASEG28
ASEG29
ASEG30
ASEG31
ASEG32
ASEG33
ASEG34
ASEG35
ACOM1
ACOM2
ACOM3
ACOM4
ACOM1
ACOM2
ASEG35
ASEG36
ASEG37
ASEG38
NC
COM17
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM8
COM7
COM6
COM5
COM4
COM3
COM2
COM1
Z1
Z2
Z3
Z4
Z5
Z6
Z7
Z8
Z9
Z10
Z11
Z12
Z13
Z14
Z15
Z16
Z17
Z18
Z19
Z20
Z21
Z22
Z23
Z24
Z25
Z26
Z27
Z28
Z29
Z30
Z31
Z32
Z33
Z34
Z35
Z36
Z37
Z38
Z39
Z40
Z41
Z42
Z43
Z44
Z45
Z46
Z47
Z48
Z49
Z50
Z51
Z52
Z53
Z54
Z55
Z56
Z57
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
Y10
Y11
Y12
Y13
Y14
Y15
Y16
Y17
Y18
Y19
Y20
Y21
Y22
Y23
Y24
Y25
Y26
Y27
Y28
Y29
Y30
Y31
Y32
Y33
Y34
Y35
Y36
Y37
Y38
Y39
Y40
Y41
Y42
Y43
Y44
Y45
Y46
Y47
Y48
Y49
Y50
Y51
Y52
Y53
Y54
Y55
Y56
Y57
X16
X15
X14
X13
X12
X11
X10
X9
X17
X8
X7
X6
X5
X4
X3
X2
X1
X1
X2
X3
X4
X5
X6
X7
X8
X17
X9
X10
X11
X12
X13
X14
X15
X16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
67
68
69
70
71
72
73
74
75
66
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
IC1006
SED1522F0C
COM7
SEG68
SEG67
SEG66
SEG65
SEG64
SEG63
SEG62
SEG61
SEG60
SEG59
SEG58
SEG57
SEG56
SEG55
SEG54
SEG53
SEG52
SEG51
SEG49
SEG48
SEG47
SEG46
SEG45
SEG50
SEG44
SEG43
SEG42
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
SEG16
SEG15
SEG14
SEG13
SEG12
SEG11
SEG10
SEG9
SEG8
SEG7
SEG6
SEG5
SEG4
SEG3
SEG2
SEG1
SEG0
A0
CS(OSC1)
CL(OSC2)
E(RD)
R/W(WR)
VSS
DB0
DB1
DB2
DB3
DB4
BD5
DB6
DB7
VDD
RES
FR
V5
V3
V2
M/S
V4
V1
COM0
COM1
COM2
COM3
COM4
COM5
COM6
R1023 2.2M
LEO
LA0
LD0
LD1
LD2
LD3
LD4
LD5
LD6
LD7
LRES
COM0
COM1
COM2
COM3
COM4
COM5
COM6
SEG44
SEG43
SEG42
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
R1019
W1020
4.7k
R1020
4.7k
R1021
4.7k
R1022
4.7k
C1011
0.1
COM7
SEG51
SEG50
SEG49
SEG48
SEG47
SEG46
SEG45
SEG33
SEG32
SEG31
SEG30
SEG29
SEG28
SEG27
SEG26
SEG25
SEG24
SEG23
SEG22
SEG21
SEG20
SEG19
SEG18
SEG17
COM0
COM1
COM2
COM3
COM0
COM1
SEG16
SEG15
SEG14
SEG13
COM0
COM2
COM3
COM4
COM5
COM6
COM7
COM6
COM5
COM4
SEG51
SEG50
SEG49
SEG48
SEG47
SEG46
SEG45
SEG44
SEG43
SEG42
SEG41
SEG40
SEG39
SEG38
SEG37
SEG36
SEG35
SEG34
R1013
470
R1012
100k
-
+
R1009
150k
2
3
4
1
8
IC1005a
M5218AFP
R1017
100k
R1018
470
-
+
R1014
180k
IC1005b
M5218AFP
7
5
6
+
-
R1036
1.2M
R1039
56k
IC1013a
M5218AFP
R1037
2.2M
1
3
2
R1038
820k
4
8
+
-
R1040
1M
R1043
56k
IC1013b
M5218AFP
R1041
2.2M
7
5
6
R1042
820k
R1050
33k
R1049
220k
R1048
47k
R1046
NTCCM20123SH
R1045
4.7k
R1047
100k
R1044
10k
R1008
10k
CNT1
-8V
8V
5V
CNT2
R1007
10k
C1009
10
C1010
10
C1008
0.1
IC1004a
TC7W32F
8
4
7
1
2
6
3
5
IC1004b
TC7W32F
V
CLR
CK
D
Q
Q
PR
G
IC1003
TC7W74F
8 6
7 4
1
2
5
3
C1007 0.1
C1005 0.1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
IC1001
HD6433833SD85H
R1002
100k
R1003
100k
R1004
100k
R1005
100k
R1006
100k
PC3/AN11
AVSS
X2
X1
VSS
OSC1
OSC2
RES
MD0
P20/IRQ4/ADTRG
P21/UD
P22
P23
P24
P25
P26
P27
P30/SCK1
P31/SI1
P32/SO1
P33/SCK2
P34/SI2
P35/SO2
P36/STRB
TEST
P37/CS
VSS
V3
V2
V1
VCC
PA3/COM4
PA2/COM3
PA1/COM2
PA0/COM1
P50/HKP0/SEG1
P51/HKP1/SEG2
P52/HKP2/SEG3
P53/HKP3/SEG4
P54/HKP4/SEG5
P55/HKP5/SEG6
P56/HKP6/SEG7
P57/HKP7/SEG8
P60/SEG9
P61/SEG10
P62/SEG11
P63/SEG12
P64/SEG13
P65/SEG14
P66/SEG15
P67/SEG16
P70/SEG17
P71/SEG18
P72/SEG19
P73/SEG20
P74/SEG21
P75/SEG22
P76/SEG23
P77/SEG24
P80/SEG25
P81/SEG26
P82/SEG27
P83/SEG28
P84/SEG29
P85/SEG30
P86/SEG31
P87/SEG32
P90/SEG33
P91/SEG34
P92/SEG35
P93/SEG36
P94/SEG37/M
P95/SEG38/DO
P96/SEG39/CL2
P97/SEG40/CL1
VCC
P10/TMOW
P11/TMOFL
P12/TMOFH
P13/TMIG
P14/PMW
P15/IRQ1/TMIB
P16/IRQ2/TMIC
P17/IRQ3/TMIF
P40/SCK3
P41/RXD
P42/TXD
P43/IRQ0
AVCC
PB0/AN0
PB1/AN1
PB2/AN2
PB3/AN3
PB4/AN4
PB5/AN5
PB6/AN6
PB7/AN7
PC0/AN8
PC1/AN9
PC2/AN10
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
LRES
LA0
LE0
LE1
LE2
LD0
LD1
LD2
LD3
LD4
LD5
LD6
LD7
CL
FRM
D
M
R1001
1M
X1001
CR-567
C1003
12p
C1002
12p
FIND
SPLD
LOCD
TXD
RXD
C1001
0.1
X
3
X0
X1
X2
X3
X4
X5
X6
X7
INH
A
B
C
C1006
0.1
13
14
15
12
1
5
2
4
6
11
10
9
7 8
16
VDD
GND
GND
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
R1132
100k
R1131
1k
R1133
1k
R1134
1k
C1004
0.1
IC1002
BU4051BCF
C1101
0.0047
D1001
MA2S111
R1121 1k
R1120 1k
R1119 1k
D1002
MA2S111
R1118 2.2k
CP1018
CP1017
R1106 1k
R1105 1k
R1104 1k
R1103 1k
R1102 1k
R1101 1k
R1122 1k
R1123 1k
R1107 1k
CP1008
CP1007
CP1006
CP1005
CP1004
CP1003
CP1002
CP1001
5VL
5VL
GND
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
BKL
RSA
MSA
RSB
LMFD
LFMD
MSB
GND
PB1A
PB1B
MDNK
MUPK
SRES
-8V
8V
GND
SPEK
LOCK
SPEK
LOCK
-8V
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
R1115 1K
R1114 1K
R1113 1K
R1112 1K
R1111 1K
R1110 1K
R1109 1K
R1108 1K
R117 47k
R116 47k
CP1016
CP1015
CP1013
CP1014
CP1011
CP1012
CP1009
CP1010
CP1025
CP1032
CP1031
CP1026
CP1024 CP1023
D1003
DA221
D1004
DA221
R1137
1k
R1135
1k
R1138
47k
R1136
47k
P50
P51
P52
P53
P54
MNUK
F1K
F2K
F3K
F4K
F5K
XFCK
MPWK
MPRK
P66
P67
CP1027
CP1050
CP1051
CP1021
CP1022
CP1042
CP1043
CP1044
CP1045
CP1046
CP2001
P50
P51
P52
P53
P54
P66
P67
C1205 0.0047
R1208
1k
C1206 0.0047
C1207 0.0047
C1208 0.0047
C1204 0.0047
C1203 0.0047
C1202 0.0047
C1201 0.0047
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
AFL
RFL
NRL
APFL
MIGL
PWRL
RITL
KYSL
MUD
DSHK
DOTK
APFK
NRK
ANTK
TUNK
TRAK
KIOI
PB2A
PB2B
GND
GND
GND
CP531 CP532
CP534
CP533
CP536
CP535
R531 1k
R532 1k
R533 1k
R534 1k
R535 1k
R536 1k
R537 1k
R538 1k
R539 1k
R540 2.2k
R541 680
R542 2.2k
R543 680
R544 680
C531 0.0047
C532 0.0047
CP546
CP545
CP543
CP544
CP542
CP547
CP552
CP551
CP554
CP553 CP555
CP556
CP559
CP560
CP558
CP557
R555 1k
R556 1k
R557 1k
R558 1k
R559 1k
R560 1k
R554
15k
R553
4.7k
R552
2.2k
R551
6.8k
R1060
18k
KI0
KI2
KI3
KI4
KI5
KI6
KI7
XFCK
MPWK
MPRK
TXD
LDV
RXD
LOCD
SPLD
FIND
F1K
F2K
F3K
F4K
F5K
LDV
5VL
MNUK
LDV
5VL
KI2
KI3
KI4
KI5
KI6
KI7
XFCK
MPWK
MPRK
TXD
RXD
LOCK
SPLD
FIND
MNUK
F1K
F2K
F3K
F4K
F5K
SSBK
CWRK
AFMK
FILK
-
+
R1030
4.7k
V1
IC1012B
5
6
7
R1035
15
+
IC1012A
M5218AFP
3
2
4
1
8
-
R1033
15
+
-
R1034
4.7k
R1026
4.7k
R1025
15
-
8
1
4
2
3
IC1010A
M5218AFP
+
R1027
15
7
-
6
5
IC1010B
V5
R1024
4.7k
+
R1029
15
-
8
1
4
2
3
IC1011A
M5218AFP
+
R1031
15
7
6
5
IC1011B
V3
R1028
4.7k
C533 0.0047
C534 0.0047
C535 0.0047
C536 0.0047
C537 0.0047
C538 0.0047
C539 0.0047
C540 0.0047
C541 0.0047
C542 0.0047
C543 0.0047
C544 0.0047
CP540
CP541
CP539
CP538
CP537
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
DISPLAY BOARD
J1001
J1002
J503
J505
PB7
PB6
PB5
PB4
PB3
PB2
PB1
PB0
FAI1
FAI2
CNT1
CNT2
R1207 1k
R1206 1k
R1205 1k
R1204 1k
R1203 1k
R1202 1k
R1201 1k
R1032
4.7k
DS1001
DLC-83006S4GT
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
FRONT UNIT
V4
V6
V2
CP1020
R1051
1k
R1052
1k
D1005 MA2S111
R1057 100k
R1054
100k
C1016
0.1
R1058
100k
R1055
100k
R1056
100k
C1015
10
SRES
MDNK
MUPK
+8V
-8V
FA11
FA12
5VL
KI1
LRES
1
2
3
6
5
4
Q1012 XP4311
DISPLAY BOARD
FRONT UNIT
Back Light
MAX: 4.9V
MIN: 0.16V
3.03V
2.49V
-7.6V
4.8V
7.8V
13.6V
5.85V
13.8V
0.15V
0.15V
-2.16V
-0.97V
0.21V
0.535V
-0.614V
-2.15V
0.565V
-0.555V
0.556V
1.616V
MAX: 2.75V
MIN: 0.92V
MAX: 3.73V
MIN: 0.87V
0.669V
14.87V
0.65V
0.551V
-0.549V
3.76V
4.93V
2.58V
7.8V
-7.6V
0.67V
0.67V
selection
Voltage(V)
P.AMP/ATT
0.00
NB
1.24
VOX
2.50
MONI
3.77
Range
Digital tester
Voltage at RX(No designation)
MEASUREMENT CONDITIONS
frequency: 14.1MHz USB
RX no input
200mV
2V
20V
Input resister
100M
Ω
11M
Ω
10M
Ω
Oscilloscope(20MHz,1M
Ω)
Range
Digital tester
Voltage at RX(No designation)
MEASUREMENT CONDITIONS
frequency: 14.1MHz USB
RX no input
200mV
2V
20V
Input resister
100M
Ω
11M
Ω
10M
Ω
Oscilloscope(20MHz,1M
Ω)
OFF
4.90
selection
Voltage(V)
SSB
0.00
CW/RTTY
1.28
AM/FM
2.54
FILTER
3.80
OFF
4.93
3.7V
0.1
µ
sec
2.65V
0.1
µ
sec
12-2 FRONT UNIT
Summary of Contents for IC-7400
Page 1: ...HF VHF TRANSCEIVER i7400 SERVICE MANUAL ...
Page 63: ...to S LOGIC board J303 DS1002 9 2 DISPLAY BOARD TOP VIEW 9 3 for free by RadioAmateur eu ...
Page 72: ...9 12 1 9 18 10 BOTTOM VIEW RF UNIT for free by RadioAmateur eu ...
Page 74: ... BOTTOM VIEW CTRL UNIT 9 14 for free by RadioAmateur eu ...
Page 76: ... BOTTOM VIEW TUNER UNIT 9 16 for free by RadioAmateur eu ...
Page 78: ...9 18 BOTTOM VIEW PA UNIT for free by RadioAmateur eu ...
Page 92: ...1 1 32 Kamiminami Hirano ku Osaka 547 0003 Japan S 13811HZ C2 2002 Icom Inc ...