Garmin APOLLO GX SERIES Service Manual

Contents

Garmin AT Rev --9-2 GX Service Manual © 2004 Garmin ATERROR MESSAGE CAUSE ACTIONAltitude encodercommunications failure1. Altitude encoder unit2. Wiring between units3. NAV board1. Check altitude encoder.2. Check wiring from encoder to GX.3. Replace the NAV board. (See NAVBoard Replacement procedure.)Fuel/Air DataCommunications Failure1. Fuel/air data unit2. Wiring between units3. NAV board1. Check fuel/air data unit.2. Check wiring from F/ADC to GX.3. Replace the NAV board. (See NAVBoard Replacement procedure.)Memory Failure; UserSetups Have Been Reset(repeats on every startup)1. Software2. NAV board1. Initialize unit. (See CompleteInitialization procedure).2. Upgrade software to v 2.2.3. Replace the NAV board. (See NAVBoard Replacement procedure.)Low Battery Voltage: UnitNeeds Service1. Low battery voltage2. Fracture betweensolder fillet and leadson battery holder3. NAV board1. Check battery voltage. Replace ifbelow 2.75V. (See BatteryReplacement procedure.)2. Replace the NAV board. (See NAVBoard Replacement procedure.)Internal Battery Failure:Turn off Unit/Needs Srvc!NAV board Replace the NAV board. (See NAVBoard Replacement procedure.)COM Radio FAILURE!Service Now1. No connectionbetween boards2. No radio power (blownfuse)3. Comm board4. NAV board1. Verify 8-pin NAV to Commconnector (Comm J4 - NAV J606).2. Verify A/C power at F400. Replacefuse if blown (See Comm BoardFuse Replacement procedure).3. Replace Comm board. (See CommBoard Replacement procedure.)4. Replace the NAV board. (See NAVBoard Replacement procedure.)Software Test Failed:Contact UPS AviationTechnologiesUser Database MemoryFailure…Flight Plan MemoryFailure…Memory Test Failure…NAV board 1. Initialize unit. (See CompleteInitialization procedure).2. Replace the NAV board. (See NAVBoard Replacement procedure.)