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AIRCRAFT
Navigation
DA 40 Series
AMM
Page 6
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have with the ADF 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
ADF receiver does not
operate.
Circuit-breaker not set.
Faulty ADF receiver.
Faulty cables/connectors.
Set the circuit-breaker.
Repair or replace the ADF
receiver.
Do a test for continuity on each
cable. Do a test for short circuit
to ground and between cables.
Replace defective cables.
ADF indicator does not
operate.
Faulty ADF indicator.
Faulty cables/connectors.
Repair or replace the ADF
indicator.
Do a test for continuity on each
cable. Do a test for short circuit
to ground and between cables.
Replace defective cables.
ADF receiver unable to tune to
an AM broadcast station.
Faulty ADF receiver.
Faulty ADF antenna.
Faulty connection between
ADF antenna and ADF
receiver.
Repair or replace the ADF
receiver.
Do a test for correct
impedance of the antenna. If
necessary, repair or replace
the antenna.
Ensure proper cable
connections. Do a test for
correct impedance of the
antenna co-axial cable. Do a
test for continuity on each
cable. Do a test for short circuit
to ground and between cables.
Replace defective cables.
AIRCRAFT
Navigation
DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
No audio from ADF. Faulty ADF receiver.
Faulty audio system.
Repair or replace the ADF
receiver.
Trouble-shoot the audio
system. Refer to Section
23-50.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-53-00 Page 201
20 Sep 2007
Maintenance Practices
1. General
This Section tells you how to remove/install the components of the ADF system. It also tells you how
to test the ADF system.
2. Remove/Install the ADF Receiver
A. Remove the ADF Receiver
Detail Steps/Work Items Key Items/References
(1) Open the ADF circuit-breaker.
(2) Put a 3/32 Allen wrench into the access hole for
the locking screw. Engage the screw.
Refer to Figure 1.
(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. IF
YOU PULL ON THE KNOBS, OR 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 ON YOUR BODY CAN
DAMAGE THE UNIT.
(4) Pull gently on the sides of the unit to remove it
from the mounting rack.
(5) Install the protective covers on the rear
connectors of the ADF receiver.
B. Install the ADF Receiver
Detail Steps/Work Items Key Items/References
(1) Remove the protective covers from the
connectors on the replacement unit.
(2) Slide the unit into the rack. Engage the locking
screw so that the latch front-lobe touches the
rack.
(3) Turn the locking screw clockwise so that the rear
lobe engages the mounting rack.
Refer to Figure 1.
AIRCRAFT
Navigation
DA 40 Series
AMM
Detail Steps/Work Items Key Items/References
Page 202
20 Sep 2007 34-53-00 Doc # 6.02.01
Rev. 5
CAUTION: DO NOT OVER-TIGHTEN THE LOCKING SCREW. YOU CAN
DAMAGE THE LOCKING MECHANISM.
(4) Continue to turn the screw until the unit is fully
installed in the mounting rack.
(5) Close the ADF circuit-breaker.
(6) Do a test of the ADF system. Refer to Paragraph 5.
3. Remove/Install the ADF Indicator
A. Remove the ADF Indicator
Detail Steps/Work Items Key Items/References
(1) Remove the instrument panel cover. Refer to Section 25-10.
(2) Dis-connect the connector from the rear of the
ADF indicator.
(3) Remove the screws which attach the ADF
indicator to the panel.
Hold the instrument!
(4) Remove the ADF indicator from the panel.
B. Install the ADF Indicator
Detail Steps/Work Items Key Items/References
(1) Put the ADF indicator in position in the panel.
(2) Install the screws which attach the ADF indicator
to the panel.
　
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