Page 4-8
GPS 155XL/GNC300 XL Installation Manual
Revision F
190-00067-22
4.4
GROUND TEST
The GPS 155XL/GNC 300XL ground test procedure incorporates a series of display pages to test
CDI/flag, OBI, annunciators, external switches, altitude inputs, and power functions of the unit.
The following pages are in the order found when rotating the large knob counterclockwise, starting at the
Display Test page. See Section 4.2 to find out how to get to this page.
4.4.1
Power Test
Select the Power Test page. This page reports the status of the GPS 155XL/GNC 300XL external power
source, remote battery, and internal memory battery. During the power test, "voltage" represents the
voltage currently measured for that function.
The first line of power information shows the following sources of external power:
•
External Power "voltage"
•
Battery Power
•
Wall Adapter
The presence of a wall adapter will override the other two sources. Battery power will not be shown
unless the Remote Battery is selected as "instld" on the Remote Battery Settings Page. The higher voltage
of external power or battery power will determine which is shown.
The next line shows the status of the remote battery as follows:
Rmt Bat none (if Remote Battery is selected as none on the Configuration Page)
Rmt Bat "voltage" "mode" "auto status"
“mode" represents the mode of the charger and is selectable. "On" enables the charger. "Off" disables
the charger. "Auto" enables the charger if the External Power is the current source and its voltage is high
enough. When in "Auto" mode, "auto status" will be either "on" or "off" reflecting whether the charger is
enabled or disabled.
The next line reports the status of the internal memory battery as follows:
Mem Bat ok/low.
The “TX” field will light on the display but the transmitter will not actually transmit when the GNC
300XL is powered from the wall charger.
