Unit Input Power Requirements - Garmin GNS 400W Series Maintenance Manual

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4.4.2 Unit Level Tests
Except for the 16 watt comm radio which requires +28 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.
Model
GPS 400W
GNC 420W
GNC 420AW
GNS 430W
GNS 430AW
All Units
GNS 400W Series Maintenance Manual
190-00356-05
NOTE
Table 4-3. Unit Input Power Requirements
Max Current (amps)
Unit
Status
27.5V Input
On 0.66
On RX: 0.99
TX: 3.36
On RX: 0.99
TX: 3.36
On RX: 1.17
TX: 3.98
On RX: 1.17
TX: 3.98
Off 0.014
13.8V Input
(Optional)
1.32
RX: 1.98
TX: 7.32
DO NOT TEST
RX: 2.34
TX: 7.96
DO NOT TEST
0.011
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