Troubleshooting For Headset Connection - Yaesu FTA-750L Spirit Operating Manual

Troubleshooting for Headset Connection

Question
When connecting the SCU-42 headset adapter
cable between the radio and a headset, the " TX "
icon appears on the display and the radio cannot
be operated.
Can I purchase the optional PTT Switch from
Yaesu?
Will my headset work with this radio?
3.5mm plug
Speaker
PTT
Microphone
Ground
Headset specification requirements for SCU-42
Earphone (speaker) impedance: 8 Ω or above
Microphone impedance: 150 Ω ±20%
PTT pressed: Ground
PTT not pressed: Open
This happens when the plug on the SCU-42 headset adapter cable is simply in-
serted into the MIC/SP jack.
To make proper contacts within the radio, the plug must be pushed all the way
in the MIC/SP jack and be fixed with the two screws.
Contact your Aviation dealer for details on purchasing an aftermarket Push-To-
Talk switch.
The SCU-42 headset adapter cable is made to operate with most headsets; how-
ever to be concretely sure to check with the headset manufacturer providing the
wiring shown below. Please confirm the connections and connector sizes are
correct.
Speaker
PJ-055 accepts 0.25" (6.3 mm) phone plug
Microphone
PJ-068 accepts 0.206" (5.2 mm) phone plug
PTT
accepts 0.138" (3.5 mm) phone plug
Answer
89