钻石40飞机维护手册 DA 40 SERIES AMM 4(8)

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) In 'ground speed/time-to-station' (GS/T) mode, the KN 62A holds the last internally selected frequency. The display shows range, speed, and time-to-station.
) Frequency select knobs. The smaller of the two knobs has an 'in' and an 'out' position. When in the 'in' position, this smaller knob changes the 0.1 MHz digit (0.0, 0.1, 0.2, etc.). When pulled 'out', it adds 0.05 MHz to the frequency and tunes in 0.1 MHz steps (0.05, 0.15, 0.25, etc.). Pushing the smaller knob 'in' subtracts 0.05 MHz from the displayed frequency. The outer, larger knob changes the larger digits (1 MHz, 10 MHz). In FREQ mode, the unit will display distance and the selected frequency.
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B. Remote DME Switch
Figure 2 shows the remote DME switch. It is installed in the left-hand section of the instrument % panel, see Chapter 31.
When the DME receiver is in 'remote' (RMT) mode, it is channeled by that NAV receiver which is selected with the remote DME switch (NAV 1 or NAV 2).
C. DME Antenna
The Bendix/King KA 60 DME antenna is located on the bottom surface of the fuselage, under the cockpit on the right side.
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Trouble-Shooting
1. General
The table below lists the defects you could have with the DME. 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 
DME does not operate.  DME circuit-breaker not set. Faulty DME receiver. Faulty cables/connectors.  Set the DME circuit-breaker. Repair or replace the DME receiver. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables. 
DME unable to tune to a DME station.  Faulty DME receiver. Faulty DME antenna. Faulty connection between DME antenna and DME receiver.  Repair or replace the DME 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. 
No audio from DME.  Faulty DME receiver. Faulty audio system.  Repair or replace the DME receiver. Trouble-shoot the audio system. Refer to Section 23-50. 

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Maintenance Practices
1. General
This Section tells you how to remove/install the components of the DME system. It also tells you how to test the DME system.
2. Remove/Install the DME Receiver
A. Remove the DME Receiver
Detail Steps/Work Items  Key Items/References 
(1)  Open the DME 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 DME receiver. 

B. Install the DME Receiver
Detail Steps/Work Items  Key Items/References 
(1)  Remove the protective covers from the connectors on the replacement unit. 
　
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