Icom IC-M424 Service Manual page 29

SECTION 8.
KEYM
1
PTT
2
GND
3
MIC-G
4
MIC-IN
5
HM-196
GND
6
SP+
7
SP-
8
SP1
R1
W1
GND
1
DIALA
2
DIALB
3
POW
4
DIAL UNIT
W1
OPC-2217
GND
1
DIALA
2
DIALB
3
POW
4
FRONT UNIT
MAIN UNIT
VCO UNIT
J1 J2
LV
1 1
SHIFT
2 2
MODC
3 3
MOD
4 4
J1
AF/MIC
MICG
10 9
GND GND
8 7
COMRXD ICF3
6 5
COMTXD PTTC
4 3
VCC-C VCC-C
2 1
W3
OPC-2216
J2
MICG
AF/MIC
1 2
GND GND
3 4
COMRXD ICF3
5 6
COMTXD PTTC
7 8
VCC-C VCC-C
9 10
GENERAL WIRING
LOGIC UNIT
MC1
J2
KEYM
1
PTT
2
GND
3
MIC-G
4
MIC-IN
5
GND
6
SP+
7
SP-
8
SP+
SP-
J3
GND
1
DIALA
2
DIALB
3
POW
4
J1
SP+ SP+
40 39
SP- SP-
38 37
HV
36 35
VCC
34 33
L5V GND
32 31
TEMPV MICIN
30 29
MICG LOINV
28 27
TDETV NOISEV
26 25
WXDEC UNLKI
24 23
DSCDEC DSCENC
22 21
BEEPO GND
20 19
NC_BUSYO
HORNO
18 17
TXMSO T5VSO
16 15
RVSO PLSTBO
14 13
PONO SCKO
12 11
DASTBO SDATAO
10 9
IOSTBO RXSPMO
8 7
ICF3 REXTMO
6 5
COMTXD RINTMO
4 3
COMRXD GND
2 1
W3
OPC-1332A-1
J2
SP+ SP+
1 2
SP- SP-
3 4
HV
5 6
VCC
7 8
RFLO L5V GND
9 10
5V TEMPV MICIN
11 12
GND MICG LOINV
13 14
PLLLO TDETV NOISEV
15 16
WXDEC UNLKI
17 18
DSCDEC DSCENC
19 20
BEEPO GND
21 22
NC_BUSYO
HORNO
23 24
TXMSO T5VSO
25 26
RVSO PLSTBO
27 28
PONO SCKO
29 30
DASTBO SDATAO
31 32
IOSTBO RXSPMO
33 34
ICF3 REXTMO
35 36
COMTXD RINTMO
37 38
COMRXD GND
39 40
CONNECT UNIT
J1
VCC 1
7
COMRXD
AF/MIC 7 1
2
ICF3 8
COMTXD 6
6 8 2
3
MICG
4
GND
PTTC 5
5
3
4
To COMMAND MIC
J5
L3V
22
GND
21
VLCD
20
VB1+
19
VB1-
18
VBO-
17
VB0+
16
GND
15
VDD
14
DB7
13
DB6
12
DB5
11
DB4
10
DB3
9
DB2
8
DB1
7
DB0
6
VDD
5
WRO
4
CD
3
RESETB
2
CS
1
J4
NMEAI+
1 1
NMEAI-
2 2
NMEAO
3 3
GND
4 4
J1
W1
ANT 1
GND
HV
GND
J3
PA+ PA+
1 1
PA- PA-
2 2
SP+ SP+
3 3
SP- SP-
4 4
8 - 1
LCD
NMEAI+
NMEAI-
NMEAO
GND
CHASSIS UNIT
W2
OPC-2215
NMEAI+ YELLOW
NMEAI- GREEN
NMEAO WHITE
GND BROWN
W1
OPC-2214
HV RED
GND BLACK
PA+ ORANGE
PA- GRAY
SP+ BLUE
SP- BLACK