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the GPS system.
If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then
do the repair given in the Repair column.
Trouble Possible Cause Repair
LCD display hard to read. Contrast adjustment not
correct.
Adjust contrast.
Radio check reports readability
good, strength poor due to low
modulation.
Mic. output low.
Faulty radio.
Replace the defective mic.
Replace the radio.
Radio check reports readability
poor, strength good.
Faulty radio.
Faulty mic.
Replace the radio.
Replace the mic.
Radio check reports readability
poor, strength poor.
Received audio is poor.
Co-ax connector faulty.
Faulty radio.
Faulty antenna.
Examine the co-ax and
connections for condition and
security.
Replace the radio.
Replace the antenna.
Short range in transmit mode,
but reception is ok.
Faulty radio. Replace the radio.
No voice modulation when
transmitting from one pilot's
side. The other pilots side OK.
Audio integrating fault.
Head-set defective.
Refer to Section 23-50.
Replace head-set.
Cannot transmit. Transmit
annunciator not shown in COM
display.
Faulty PTT switch.
PTT wiring circuit defective.
Faulty radio.
Replace PTT switch.
Do a test of the PTT wiring
circuit. Refer to Chapter 92 for
the wiring diagrams.
Replace the radio.
AIRCRAFT
Communications DA 40 Series
AMM
Page 102
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
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AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This section tells you how to remove/install the main components of the speech communication
system. Refer to the equipment manufacturer's manuals for more data about the equipment.
2. Remove/Install the NAV/COM unit or NAV/COM/GPS unit
A. Remove the NAV/COM unit or NAV/COM/GPS unit
Detail Steps/Work Items Key Items/References
(1) Open the related circuit breaker(s). NAV/COM circuit breaker for the
NAV/COM unit.
COM and NAV/GPS circuit breakers for
the COM/NAV/GPS unit.
(2) Put a 3/32 Allen wrench into the access hole for
the locking screw. Engage the wrench into the
screw.
Refer to Figure 2 (KX 125), Figure 3
(KX 155A/165A), Figure 4 (GNS 430) or
Figure 5 (GNS 530).
(3) Turn the screw counter-clockwise until the unit
disengages from the mounting rack.
CAUTION: DO NOT PULL ON THE KNOBS. DO NOT PRY THE FACE-PLATE.
YOU CAN DAMAGE THE UNIT.
CAUTION: DO NOT TOUCH THE CONNECTOR CARD AT THE REAR OF THE
UNIT. THE ELECTROSTATIC CHARGE OF YOUR BODY CAN
DAMAGE THE UNIT.
(4) Pull gently on the side of the unit to remove it
from the mounting rack.
(5) Install the protective covers on the rear
connectors of the unit.
AIRCRAFT
Communications DA 40 Series
AMM
Page 202
20 Sep 2007 23-10-00 Doc # 6.02.01
Rev. 5
B. Install the NAV/COM unit or NAV/COM/GPS unit
Detail Steps/Work Items Key Items/References
(1) Remove the protective covers from the
connectors on the rear of the unit.
(2) Slide the unit into the rack. Engage the locking
screw so that the lobe of the front latch touches
the rack.
(3) Turn the locking screw so that the rear lobe
engages the mounting rack.
Refer to Figure 2 (KX 125), Figure 3
(KX 155A/165A), Figure 4 (GNS 430) or
Figure 5 (GNS 530).
CAUTION: DO NOT OVER-TIGHTEN THE LOCKING SCREW. YOU CAN
DAMAGE THE LOCKING MECHANISM.
(4) Continue to turn the locking screw until the unit is
fully installed in the mounting rack.
(5) Close the related circuit breaker(s). NAV/COM circuit breaker for the
NAV/COM unit.
COM and NAV/GPS circuit breakers for
the COM/NAV/GPS unit.
(6) Do a function test of the system. Refer to Paragraph 8.
AIRCRAFT
DA 40 Series
AMM
Communications
Doc # 6.02.01
Rev. 5 23-10-00 Page 203
20 Sep 2007
3. Configuration of the Garmin COM/NAV/GPS GNS 430
You must configure the unit after replacing it.
A. Configuration Mode Operation
With power applied to the avionic rack and the GNS 430 unit turned off, press and hold the ENT
key and turn the unit on. Release the ENT key when the display activates. After the data base
page, the first page displayed is the MAIN ARINC 429 CONFIG page. While in Configuration Mode,
pages can be selected by ensuring the cursor is off and rotating the small right knob.
To change data on the displayed Configuration Page, press the small right knob (CRSR) to turn
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