Garmin GNC 420 Maintenance Manual page 9

ALIGNMENT, CALIBRATION, AND TESTING (continued)
5.7.4 Navigation Assembly I/O Tests .................................................................... 5-32
5.7.4.1 Localizer Course Deviation Test ................................................................... 5-32
5.7.4.2 To/From Deflection Output Characteristic Test ............................................. 5-32
5.7.4.3 To/From Deflection Accuracy Test ................................................................ 5-32
5.7.4.4 Course Deviation Flag Output Characteristic Test ........................................ 5-33
5.7.4.5 Course Deviation Flag Test........................................................................... 5-33
5.7.4.6 VOR/LOC Super Flag Output Test ................................................................ 5-33
5.7.4.7 NAV Input Lines ............................................................................................ 5-34
5.7.4.8 NAV OBI Outputs .......................................................................................... 5-34
5.7.4.9 Nav Serial DME Outputs ............................................................................... 5-35
5.7.4.10 NAV Parallel DME Outputs ........................................................................... 5-35
5.7.5 Glideslope Final Tests................................................................................... 5-37
5.7.5.1 Glideslope Course Deviation Output Characteristic Test .............................. 5-37
5.7.5.2 Course Deviation Deflection Accuracy Test .................................................. 5-37
5.7.5.3 Course Deviation Flag Test........................................................................... 5-37
5.7.5.4 Glideslope Superflag Output Test ................................................................. 5-38
5.7.5.5 Receiver Sensitivity ....................................................................................... 5-38
5.7.5.6 Centering Accuracy ....................................................................................... 5-39
5.7.5.7 AGC............................................................................................................... 5-39
5.7.5.8 Selectivity (Bandwidth) .................................................................................. 5-39
5.7.5.9 Nose Bandwidth ............................................................................................ 5-40
5.7.5.10 Skirt Bandwidth ............................................................................................. 5-40
5.7.5.11 Spurious Response ....................................................................................... 5-40
5.7.5.12 Status Tests .................................................................................................. 5-41
5.7.6 Main Board Final Tests ................................................................................. 5-42
5.7.6.1 Push Button Response.................................................................................. 5-42
5.7.6.2 Rotary Knobs................................................................................................. 5-42
5.7.6.3 Map ID and Data Card Test .......................................................................... 5-42
5.7.6.4 Photocell........................................................................................................ 5-43
5.7.6.5 Lighting Bus Input ......................................................................................... 5-43
5.7.6.6 Memory Battery Voltage................................................................................ 5-44
5.7.6.7 Display Pattern Test ...................................................................................... 5-45
5.7.6.8 Fan Test ........................................................................................................ 5-45
5.7.6.9 Unit Configuration Test.................................................................................. 5-45
5.7.6.10 GPS Antenna Bias ........................................................................................ 5-45
5.7.6.11 GPS Noise..................................................................................................... 5-45
5.7.6.12 Satellite Tracking Test................................................................................... 5-46
5.7.6.13 MAIN Lateral LEFT, RIGHT Outputs ............................................................. 5-47
400 SERIES MAINTENANCE MANUAL
P/N 190-00140-05
SECTION 5
Page vii
Rev. C