89
Troubleshooting for Headset Connection
Question
Answer
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.
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.
Can I purchase the optional PTT Switch from
Yaesu?
Contact your Aviation dealer for details on purchasing an aftermarket Push-To-
Talk switch.
Will my headset work with this radio?
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.
3.5mm plug
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
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