![background image](http://html2.mh-extra.com/html/icom/ic-400pro/ic-400pro_service-manual_3993468028.webp)
J3
14
2
13
1
J3
GND
GND
PW
ON
OPT1
P87
P86
CPU5V
GND
GND
GND
NMI
RES
OPT2
NC
1
16
1
48
24
13
12
36
37
25
1
7
14
8
17
32
33
48
49
8
5
1
4
64
1
39
2
to MAIN unit J2
40
J2
DIM
D
AST
OPT3
OPT2
OPT1
PTT
O
PTTI
REM
SCK
SI
SO
CIRQ
CCS
MIC
EPTT
NC
BEEP
PW
ON
8V
GND
GND
TO
N
E
TENC
NOIS
EXOE
EXST
UNLK
PLST
CDEC
SDEC
O
V12
RSSI
LVIN
TEMP
BA
TV
NC
NC
5V
CPU5
AFO
9 - 2
• BOTTOM VIEW (FRONT UNIT)