Icom IC-M304 - Page 23

9 - 1
SECTION 9 BOARD LAYOUTS
DS2
3
S
D
4
SD
DS5
DS6DS7
61
TSID
CSD
HCNACS
1SD
0
H
5
H
0
1
H
5
1
H
02
H
52H
03
H
53H
0
4H
5
4
H
0
5H
5
5H
0
6H
5
6
H
07
H
5
7
H
08
H
V0
V5
V10
V15
V20
V25
V30
V35
V40
V45
V50
1C
S1
H0
H5
H10
H15
H20
H25
H30
H35
H40
H45
0V
5V
01V
51V
02V
52V
03V
53V
04V
54V
05V
55V
06V
56V
H0
H5
H10
0
V
5
V
01
V
51
V
1J
R1
H0
H5
H10
0V
5V
01V
C3
C4
5C
6C
C7
8C
21
C
C13
41C
51C
C16
C17
C18
91C
02
C
C21
C22
32
C
C24
52
C
62C
C27
C28
92C
C30
C31
C32
43C
C35
63C
C42
C44
6
4
C
C47
C48
C49
C50
C52
C53
C55
C57
C59
06C
C61
C62
C63
C64
C65
C67
86C
C70
C71
C72
37C
4
7
C
57C
6
7
C
C77
C80
28
C
3
8C
C84
C85
C86
C88
C89
09C
19C
29C
C93
C94
C95
79C
9
9C
0
0
1
C
C101C102
C103
401C
501C
C110
C111
2
11
C
3
1
1C
411C
C115
C116
711C
811C
C119
C121
2
2
1C
421
C
5
21
C
C126
C127
8
21C
C129
C130
5
31
C
631C
C138
C139
041C
C145
6
41
C
C147
C148
C149
151C
351C
951C
161C
461C261C
C165
C166
C167
171C
C172
C173
471C
C175
67
1
C
77
1
C
8
7
1
C
C179
0
81
C
C181
C182
C184
581C
C186
C194
891C
991C
C201
C202
C203
502C
C206
C207
C208
112C
21
2
C
312C
4
12
C
C215
612C
C217
C220
C221
C222
C223
5
22
C
622C
C227
8
2
2C
C230
2
32
C
3
32
C
4
32
C
C236
C241
C242
C243
442C
54
2C
64
2
C
742C
84
2
C
C249
C250
C251
C252
C254
7
5
2
C
85
2
C
C259
C269
C270
372C
C274
C275
C276
C277
C278
C279
C280
C291
C292
C294
C295
692C
C297
89
2
C
9
9
2
C
003C
C301
C302
C303
4
03
C
5
0
3C
603C
7
03
C
1D
2D
4
D
D5
6D7
D
8D
D9
11D
21D
D13
D14
D16 D17
22D12D
52D
D26
1IF2IF
3IF
IC1
IC3
IC6
7CI
8CI
IC9
IC10
1J
2J
2
J
1L
L2
3L
L6
L7L8
9L
L10
L12 L13
L21
22L
3
2
L
L26
L28
L29
1
3
L
23L
5
3L
63
L
1PM
3
P
M
1Q
Q2
Q4
5Q
Q6
7
Q
Q11
21Q
31Q
Q14
Q15
Q16
Q17
91
Q
02Q
12Q
2
2Q
Q23
Q25
62Q
13Q
Q32
33Q
Q34
Q35
Q36
4R 5R
R6
7
R
8
R
9R
01R
R12
4
1
R
R16
71R
12R
52
R
62
R
R27
82R
13R
R32
33
R
R34
R35
R36
R37
R38R39
R41
24R
R43
R44
R45
R46
74R
84
R
94R
R50
15R
R52
35R
45R
R55
R56
R57
85R
16R
26R
R63
R64
R65
66
R
7
6R
86R
R69
R70
17R
R72
37R
R74R75
6
7
R
R77
R78
18R
28R
3
8R
4
8R
58R
R86
R87
R88
9
8
R
09R
19R29
R
39
R
4
9
R
59R
R96
R97
R102
30
1
R
R106
R108
901R
011R
R111
R112
R113
R126
721R
R128
R129
03
1
R
R134
R135
R136
R137
83
1
R
931R
0
41
R
R141
R144
R145
641R
741R
8
41
R
941R
1
51R
2
51
R
R153R154
R155
R156
R157
R158
R159
1
6
1R
2
61
R
R164
561R
R170
17
1
R
271R
R173
471R
671R
7
71
R
871R
97
1
R
081R
R181
R182R183
481R
R188
981R
09
1
R
191R
1
0
2R
R202
302R
4
0
2
R
502R
602R
0
1
2R
11
2
R
R212
312R
R214
5
1
2R
R216
122R
222R
R223
R224
5
2
2
R
62
2
R
1W
1X
2X
B1666B
RSSI
2W
6
1
5
4
3
2
RWP
FER
CIM
SQL
VR/
0
H
5
H
0
1
H
5
1
H
0
2
H
5
2
H
0
3
H
5
3
H
0
4
H
5
4
H
0
5
H
5
5
H
0
6
H
5
6
H
0
7
H
5
7
H
0
8
H
5
8
H
0
9
H
5
9
H
0
0
1
H
5
0
1
H
0
1
1
H
V0
V5
V10
V15
V20
V25
V30
V35
V40
V45
V50
V55
V60
V65
V70
V75
V80
• MAIN UNIT (TOP VIEW)
IC4 (MAIN UNIT)
• LOGIC UNIT (TOP VIEW)
• HM-164B/SW/G
• SQL UNIT (TOP VIEW)
• VR UNIT (TOP VIEW)
J1
GND 30
29 GND
UNLK
P DATA
PCK
PSTB
BPF
H/L
SQLC
TXDET
SQL
TMUTE
KEYM
SEND
PTT
RCV
PTTC
DSCDEC
RMUTE
WXDEC
DSCENC
5V
5V
NC
HVS
SQLV
BPLVL
BEEP
SP− 2
1 SP+
J2
KEYM 5
GND
MIC
MICG
PTT 1
W1
8 HVS
VOL1 VOL2
GND
HV
SQLI
SQLV
1 GND
J1
HVS 1
VOL1
VOL2
GND
HV 5
J2
GND 1
SQLV
SQLI 3
MC1
J1 (CHASSIS)
W2 (MAIN UNIT)
To J1 (LOGIC UNIT)
To HM-164B/SW/G
To J1 (VR UNIT)
To J2 (SQL UNIT)
To W1 (MAIN UNIT)To W1 (MAIN UNIT)
MIC
MICG
KEYM
PTT
GND
To W1 (MAIN UNIT)
L3
L4
M304A3.indd6-7 12/27/20062:49:00PM