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400 SERIES MAINTENANCE MANUAL Page A-1
P/N 190-00140-05 Rev. C
APPENDIX A
GNC 420A AND GNS 430A
A.1 DESCRIPTION
This appendix describes version A of the GNC 420 and the GNS 430. The ‘A’ versions contain a
16 watt VHF Com Transmitter as opposed to a 10 watt transmitter. There is one Com Board part
number for the GNC 420 and GNS 430 ‘A’ versions which is 012-00611-00.
A.2 ‘A’ VERSION UNIT PART NUMBERS
GNC 420A
UNIT P/N COLOR OPERATING
VOLTAGE
MINIMUM
XMIT PWR
011-00837-00 BLACK 28 V Only 16 W
011-00837-10 GRAY 28 V Only 16 W
GNS 430A
UNIT P/N COLOR OPERATING
VOLTAGE
MINIMUM
XMIT PWR
011-00836-00 BLACK 28 V Only 16 W
011-00836-10 GRAY 28 V Only 16 W
A.3 TROUBLESHOOTING
Follow the procedures in Section 3 to troubleshoot the GNC 420A and GNS 430A. The following
exceptions are given:
Table A-1. Unit Main Board Power Supply Maximum Current
Unit (Main Board) Unit Status Max Current (A)
@ 27.5 V
GNC 420A ON RX—0.99
TX—3.36
GNS 430A ON RX—1.17
TX—3.98