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panel.
(2) Install the attaching screws.
(3) Connect the connector to the unit.
(4) Install the instrument panel cover. Refer to Chapter 25-10
(5) Close the ICS circuit-breaker.
(6) Do a function test. See below.
Communications
DA20-C1 AMM
Page 202
19 Dec 1997 23-50-00 Doc # DA201-C1
Rev. 0
C. Adjustment/Test PM 501 Intercom
(1) Equipment
Items Quantity Part Number
Headsets 2 Commercial
Detail Steps/Work Items Key Items
(1) Connect the headsets.
(2) Select the mode switch to ALL.
(3) Push the VOLUME control to turn on the
unit.
(4) Do a test for communication between the
pilot and co-pilot.
(5) Test the function of the VOLUME control.
(6) Test the function of the SQUELCH control.
(7) Set the ISO/ALL switch to ISO. Make sure that there is no intercom
between the pilot and co-pilot.
(8) Pull the ICS circuit-breaker. Make sure that
radio reception and transmission is possible
from the pilot’s headset.
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-50-00 Page 203
19 Dec 1997
3. Remove Install the Bendix\King KMA 24 Audio/Marker Receiver
A. Remove the Bendix\King KMA 24
Detail Steps/Work Items Key Items
(1) Open the marker and ICS circuit-breakers.
(2) Put a 3/32 allen wrench into the access hole
for the locking screw. Engage the screw.
Refer to Figure 2
(3) Turn the screw counter-clockwise until the
unit disengages from the mounting rack.
CAUTION: DO NOT PULL ON THE KNOBS. DO NOT USE A SCREWDRIVER
TO REMOVE 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 radio.
B. Install the Bendix\King KMA 24
Detail Steps/Work Items Key Items
(1) Remove the protective covers from the
connectors from the rear connectors on the
radio.
(2) Slide the unit into the rack. Engage the
locking screw.
Refer to Figure 2
(3) Turn the locking screw clockwise so that it
engages the mounting rack.
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 marker and ICS circuit-breakers.
(6) Do a function test. See below.
Communications
DA20-C1 AMM
Page 204
19 Dec 1997 23-50-00 Doc # DA201-C1
Rev. 0
C. Adjustment/Test KMA 24
If possible, do an operational flight check of the marker receiver functions after the KMA 24 has
been replaced. Alternatively, use a NAV COMM test set to make sure that the system operates
correctly. Refer to the Bendix\King Installation manual #006-00180-0001 for performance
specifications.
Detail Steps/Work Items Key Items
(1) Do a test of the marker receiver control
functions.
See also Chapter 34-30 for description.
(2) Press the Test Button:
− Make sure the 3 marker beacon lights
come on.
(3) Do a test of each audio source button:
− Set one selector button to ON.
− Set the selector button to OFF.
− Do this for each button which controls an
audio source.
Make sure that the speaker or phone
operates correctly for each button.
(4) Make sure that the COMM 1 and 2 speaker
and phone buttons are set to OFF.
(5) Set the AUTO SPEAKER and PHONE
buttons to ON.
(6) Set the mic selector switch to COM1. Make sure that you can hear received
audio from COMM 1 on the speaker and
headphones.
(7) Set the mic selector switch to COM2. Make sure that you can hear received
audio from COMM 2 on the speaker and
headphones.
(8) Do a radio check on COMM 1 and COMM 2. To make sure that the mic audio and PTT
lines operate correctly.
4. Connectors
Remove contacts from connectors in the radio rack with Hand Ejector Tool Molex part number HT-
1884. Crimp solderless contact terminals with Molex part number 6115.
DA20-C1 AMM
Communications
Doc # DA201-C1
Rev. 0 23-60-00 Page 1
19 Dec 1997
CHAPTER 23-60
STATIC DISCHARGING
1. General
A special bonding system is necessary for the composite structure of the DA20-C1. The composite
structure does not conduct electricity. Copper foil tape bonds to the inside of the structure to make a
conducting path. A special conductive adhesive bonds the tape to the structure. Bonding wires
connect the foil to all metal components and antenna ground planes.
　
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