190-01879-11 GMA 245/245R Installation ManualRev. 6 Page 4-84.6.5 Failsafe Warning AudioFailsafe audio is audio from another device that is heard when the GMA is in failsafe mode (power off orunit failure) and is desired to be heard in addition to the COM audio.CAUTIONDuring failsafe mode both FAILSAFE WARN AUDIO IN HI and COM 1 AUDIO INPUTare connected to the PILOT HEADSET LEFT OUTPUT. When in failsafe the output of theCOM 1 radio and the output of the device connected to FAILSAFE WARN AUDIO IN HIwill become shorted together, potentially causing damage or interference. If theFAILSAFE WARN AUDIO IN HI is used, it may be necessary to install summing resistorsin series between these sources and the inputs to the audio panel to protect the outputsfrom damage.4.6.6 Music InputsThe MUSIC LO signals are not the same reference as other ground connections. The MUSIC LO signalsshould be used as part of a differential pair (along with the MUSIC RIGHT and MUSIC LEFT signals). Ifthe MUSIC LO signal is tied to a ground connection, the music will contain noise, and the audio qualitywill be degraded.Table 4-10 Failsafe Warning AudioPin Connector Pin Name Description I/O29 J2402 FAILSAFE WARN AUDIOIN HIIn the event of power loss, if wired,failsafe warning audio will be heard in thePilot’s Left headset in addition to theCOM1 Audio Input.IN14 J2402 ALERT 2 LO, FAILSAFEAUDIO IN LOGround Reference for Failsafe WarningAudio Input --Table 4-11 Music InputsPin Connector Pin Name Description I/O23 J2402 MUSIC 1 IN LEFT Music 1 Input IN24 J2402 MUSIC 1 IN RIGHT25 J2402 MUSIC 1 IN LO Differential Reference for Music 1 --26 J2402 MUSIC 2 IN LEFT Music 2 Input IN27 J2402 MUSIC 2 IN RIGHT28 J2402 MUSIC 2 IN LO Differential Reference for Music 2 --
