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GNS 400W Series Maintenance Manual
Page 4-9
190-00356-05
Rev. A
4.4.2 Unit Level Tests
NOTE
Except for the 16 watt comm radio which re28 V dc, all units operate
with external power from 9-33 V dc.
Unit Power Input Check
All units operate with external power from 9-33 V dc. The power consumption must not exceed
the limits shown in Table 4-3 with the display backlight at maximum brightness. Return the unit
to Garmin for service if any unit fails the power requirement checks.
Table 4-3. Unit Input Power Requirements
Max Current (amps)
Model
Unit
Status
27.5V Input
13.8V Input
(Optional)
GPS 400W
On
0.66
1.32
GNC 420W
On
RX: 0.99
RX: 1.98
TX: 3.36
TX: 7.32
GNC 420AW
On
RX: 0.99
DO NOT TEST
TX:
3.36
GNS 430W
On
RX: 1.17
RX: 2.34
TX: 3.98
TX: 7.96
GNS 430AW
On
RX: 1.17
DO NOT TEST
TX:
3.98
All Units
Off
0.014
0.011
