Garmin APOLLO GX SERIES Service Manual

Contents

Garmin AT Rev --© 2004 Garmin AT GX Service Manual 9-5SYMPTOM CAUSE ACTIONNo serial data out 1. User configuration2. A/C Installation3. NAV board1. Verify user configuration.2. Check A/C installation.3. Replace the NAV board. (See NAVBoard Replacement procedure.)Noise in headset 1. Connections2. User configuration3. Comm board1. Verify headset with another.2. Verify user configuration.3. Replace Comm board. (See CommBoard Replacement procedure.)Not flip/floppingfrequencies1. Remote frequencyswitch2. No power to Commboard3. Comm to NAV cable4. Comm board1. Check remote switch operation.2. Verify A/C power and ground toComm board.3. Check fuse (F400) on Comm board.4. Verify 8-pin NAV to Commconnections (Comm J4 to NAVJ606).5. Replace Comm board. (See CommBoard Replacement procedure.)RX audio distortion 1. Radio interference2. Antenna connections3. Comm board1. Verify area/instrument interferenceis not the cause.2. Check the antenna.3. Replace Comm board. (See CommBoard Replacement procedure.)Stuck in simulation mode 1. A/C installation2. NAV board1. Verify pin 7 of 37 pin D-subconnector (P701) is grounded.2. Replace the NAV board. (See NAVBoard Replacement procedure.)Soft key inoperative 1. Software version 1.02. Soft key flex cable orconnection3. Display assembly1. Check all soft keys in normaloperation.2. Ensure that soft key flex cable isconnected.3. Replace display assembly. (SeeDisplay Replacement procedure).Resets on low mapsettingsSoftware version 1.0 Replace the NAV board. (See NAVBoard Replacement procedure.)Unit intermittent below 20on the map scaleSoftware version 1.0 Replace the NAV board. (See NAVBoard Replacement procedure.)When in approach, willnot display baro & give alterrorSoftware version 1.0 1. Replace the NAV board. (See NAVBoard Replacement procedure.)2. Verify good 3-D fix.Display flashescontinuously undercertain light conditionsSoftware version 1.0 Replace the NAV board. (See NAVBoard Replacement procedure.)