Garmin GNC 420 Maintenance Manual page 161

B.4 COM BOARD CONNECTORS
B.4.1 J2
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05
Table B-12. J2 Descriptions
Pin # Name
1 RESERVED
2 COM IF AGC TEST
3 SQUELCH / COMPRESSOR
TEST
4 COM MIC KEY
5 INTERCOM MIC HI
6 COM MIC AUDIO HI
7
500 COM AUDIO HI
8 RESERVED
9 RESERVED
10 RESERVED
11 AIRCRAFT POWER
12 AIRCRAFT POWER
13 RESERVED
14 TRANSMIT INTERLOCK
15 COM REMOTE TRANSFER
16 SPARE
17 INTERCOM MIC LO
18 COM MIC AUDIO LO
19
500 COM AUDIO LO
20 COM AUDIO IN LO
21 AIRCRAFT GROUND
22 AIRCRAFT GROUND
23 RESERVED
24 RESERVED
25 RESERVED
I/O
O
I
I
I
I
O
I
I
I
I
I
O
I
I
-
I
I
O
I
I
I
I
I
O
Page B-11
Rev. C