Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 243 / 903

AIRCRAFT
DV 20 E AMM Communications
Doc # 4.02.25
Rev. 2
23-50-00
Page 101
15 Mar 2022
Trouble-Shooting
1. General
This table tells you how to trouble-shoot the audio integrating system. If you find the trouble in column
1 do the repair given in column 3.
Refer to Garmin GMA 340 Audio Panel, Maintenance Manual, Doc No.190-00149-02, latest revision,
for detailed troubleshooting procedure.
Trouble Possible Cause Repair
No voice modulation when
transmitting from co-pilot's side
on head-set. Pilot's side OK.
Faulty head-set.
Open mic audio line.
Faulty audio panel.
Replace head-set.
Do a test of the mic audio
wiring. Refer to Chapter 92 for
the wiring diagrams.
Replace the audio panel.
No voice modulation when
transmitting from pilot’s side on
head-set. Co-pilot’s side OK.
Faulty head-set.
Open mic audio line.
Faulty audio panel.
Replace head-set.
Do a test of the mic audio
wiring. Refer to Chapter 92 for
the wiring diagrams.
Replace the audio panel.
Cannot transmit. Transmit
annunciator (if available) not
showing on COM display.
Faulty mic PTT switch.
PTT wiring circuit open.
Faulty COM unit.
Faulty audio panel.
Replace the defective PTT
switch.
Do a test of the PTT wiring.
Refer to Chapter 92 for the
wiring diagrams.
Replace the COM unit.
Replace the audio panel.
No intercom audio on pilot’s
head-set. Receives radio
transmissions correctly.
PILOT mode (GMA 340)
selected.
Select ALL mode.
Replace the audio panel.
Faulty audio panel.