Garmin GNC 420 Maintenance Manual page 153

AIRCRAFT POWER
MAIN +LEFT
MAIN +RIGHT (2.5V Common)
MAIN LATERAL +FLAG
MAIN LATERAL -FLAG (2.5V Common)
MAIN +TO
MAIN +FROM (2.5V Common)
MAIN +UP
MAIN +DOWN (2.5V Common )
MAIN VERTICAL +FLAG
MAIN VERTICAL -FLAG (2.5V Common)
MAIN OBS ROTOR C
MAIN OBS ROTOR H (Ground)
MAIN OBS STATOR D
MAIN OBS STATOR E (2.5V Common OBS)
MAIN OBS STATOR F
MAIN OBS STATOR G (2.5V Common OBS)
ALTITUDE ALARM AUDIO HI
ALTITUDE ALARM AUDIO LO (Ground)
LIGHTING BUSS HI
LIGHTING BUSS LO
GPS RS232 OUT3
GPS RS232 IN3
MAIN OBI CLOCK
MAIN OBI DATA
MAIN OBI SYNC
GPS ARINC 429 OUT A
GPS ARINC 429 OUT B
GPS ARINC 429 IN1 A
GPS ARINC 429 IN1 B
GPS ARINC 429 IN2 A
GPS ARINC 429 IN2 B
RESERVED
RESERVED
GPS RS232 OUT4
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05
Table B-3. J1 Descriptions (continued)
20 I
21 O
22 O
23 O
24 O
25 O
26 O
27 O
28 O
29 O
30 O
31 O
32 O
33 I
34 O
35 I
36 O
37 O
38 I
39 I
40 I
41 O
42 I
43 O
44 O
45 O
46 O
47 O
48 I
49 I
50 I
51 I
52 -
53 -
54 I
Page B-3
Rev. C