190-01878-02
GMA 342/345 Installation Manual
Rev. 5
Page 3-7
3.7.8 Other Optionally Installed I/O
Verify any other installed/configured inputs and outputs operate properly. Possible examples include: ICS
keys, Play key, PA Mute output, PA Mode Selected output, COM Active output, and Middle Marker Sense
output.
This completes the in-aircraft post installation checkout. Perform a flight test after installing the unit to
ensure satisfactory performance of the audio functions.
3.8 Continued Airworthiness
Other than for regulatory checks, maintenance of the GMA 342/345 is "on condition" only. Periodic
maintenance of the GMA 342/345 is not required.
3.9 Diagnostics Information
The GMA 342/345 is capable of displaying diagnostics information while in normal mode of operation. To
show the diagnostics information press the PLAY button for five seconds. While still holding the PLAY
button, all button annunciators will turn off except for those associated with certain diagnostic states. All
button annunciators are off if no diagnostic information is available. The image below depicts which
button annunciators are associated with which diagnostic states.
NOTE
The GMA 345 (2-COM version) is used as the example for this section. Some of the
GMA 345 3-COM unit button text labels differ from the 2-COM version.
Figure 3-2 Diagnostics Mode (2-COM version shown)
• A Headset Short indication means that the unit has detected the associated headset wire is shorted
to ground or to another headset channel. No headset short should be detected if the headset jack is
wired for a stereo jack, and the headset is a stereo headset. A headset short may be detected for a
mono headset.
• A Hardware Fault indication means the unit has detected an internal unrecoverable fault. Contact
Garmin Aviation Customer support for assistance.
• A Software Load Fault indication means the previous software update didn’t complete
successfully. Retry loading software from the loader card to resolve this fault.
Press-n-Hold PLAY
Diagnostics Mode
COM1
Pilot HS Left Short
COM2
Pilot HS Right Short
NAV1
Copilot HS Left Short
NAV2
Copilot HS Right Short
MUSIC
Pass HS Left Short
AUX1
Pass HS Right Short
CREW
Software Load Fault
PILOT
Hardware Fault
