JA39-022 Headset Adapter -
230 Ω Mic
-
230 Ω Phones
Installation Manual
Rev A
Page 5
CAUTION
: When plugged in to a headset audio connector, the JA39 could create excessive strain on
the connector. Ensure that the JA39 is protected from impact, and that no tension is applied to any
attached headset cord.
2.4.4
In-Line PTT Cordsets
If in-line PTT cordsets
(drop cords) are used, be aware that
incorrectly configured or improperly
shielded
in-line PTT
cordsets can lead to significant
audio problems
.
2.4.5
Post Installation Checks
2.4.5.1
Configuration
The JA39 has no configuration options.
2.4.5.2
Power on Checks.
Power up the aircraft’s systems and
confi
rm operation of all functions of the
JA39.
a)
Begin with
a
headset attached. Confirm correct operation for both
Mic
and phones output
. Do not proceed
until the headset
is functioning correctly.
b) Unusual buzzes, hums or other background audio are symptomatic of multiple grounds, or noisy external
systems such as blowers or pumps sharing wiring with the audio system.
2.5
System Operation
The
JA39-022
is designed to operate regardless of the input and output polarities of the attached audio controller and
headset.
2.5.1
Microphone Operation
The
JA39-022
amplifies the MIC INPUT
audio and routes it
to the MIC OUTPUT.
2.5.2
Phones Operation
The
JA39-022 routes
the PHONES INPUT audio
to the PHONES OUTPUT.
2.6
Installation Kit
The
JA39-022
does not require an installation kit.
2.7
Installation Drawings
The drawings and documents required for Installation can be found in
of this manual.
