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Page 4-10
GNS 400W Series Maintenance Manual
Rev. A
190-00356-05
Bus Power
Aircraft Power BUS 1: (J1-19 and J1-20).
Aircraft Power BUS 2: (J1-15 and J1-72).
1.
Power the unit via Aircraft Power BUS 1. Verify proper operation.
2.
Power the unit via Aircraft Power BUS 2. Verify proper operation.
Push Button Response
Turn the unit on in normal mode and push each button and verify proper operation.
Rotary Knobs
Turn each rotary knob at least three turns in the same direction and verify proper
operation.
Data Card Tests
Apply power to the unit and verify the successful display of the following terrain data card and
Jeppesen NAVData® card data:
•
World Wide Land Data
•
World Wide Terrain Database
•
Airport Terrain Database
•
Data Card profile (e.g., America, World)
•
Cycle Version
•
Copyright Information (date and company)
Photocell
Turn the unit on in test mode and verify brightness control is in photo mode, using the main
lighting page. With the photocell uncovered, ensure that the display and keyboard backlight LED
brightness is proper under normal conditions. Cover the photocell and verify display and
keyboard backlight LED brightness decreases.
Lighting Bus Input
NOTE
If a lighting bus option other than photo is selected, and the lighting bus control
is turned to its minimum (daytime) setting, the display brightness will default to
tracking the unit photocell.
•
Lighting BUS HI: (J1-39)
•
Lighting BUS LO: (J1-40)