(a)  
To remove the microphone switch, disconnect the PINK and WHITE/RED wires from the terminals.

 (b)  
To remove the interphone switch, disconnect the WHITE/ORANGE and RED/BLACK wires from the terminals.

 S 494-012
 (5)  
Connect one end of the 30 inch length of copper wire around the two wires connected to the switch.

 S 034-013

 (6)  
Remove the two mounting screws.

 S 034-049

 (7)  
Remove the switch assembly.

 (8)  
Pull the switch wires through the PTT switch hole.

 S 034-057
 NOTE: Pull approximately 3 or 4 inches of the copper wire out
____
 of the hole for the PTT switch.

 S 094-014
 (9)  
Disconnect the copper wire from the switch wires.

 (10)
 Remove the locking screw.

 (11)
 Remove the switch from the clamp.

 S 034-015
 S 024-055
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757 MAINTENANCE MANUAL
 S 014-016
 (12) Remove the terminal lugs from the switch.
 TASK 23-51-03-404-017
 3.  Install the PTT Switch (Fig. 401)______________________
 A. Equipment
 (1)  Insertion and Extraction Tool (Duetch
 No. M15570-20)

 B. Consumable Material
 (1)  G00628 30 inch length of copper wire (No. 18 to
 22 gauge) - without insulation if possible

 C. References
 (1)  AMM 24-22-00/201, Electrical Power - Control
 D. Access
 (1)  Location Zone
 211/212 Flight Compartment

 E. Install the PTT Switch
 S 314-018
 (1)  
Install the terminal lugs on the switch wires to the switch terminals (Fig. 401).

 S 424-022

 (2)  
Install the interphone switch in the clamp as shown in Fig. 401, detail A.

 S 214-050

 (3)
Make sure that the interphone switch does not turn in the clamp.

 S 424-023

 (4)  
Install the microphone switch in the clamp until the switch touches the trigger.

 S 824-051

 (5)  
Adjust the microphone switch 1/4 |1/8 of a turn to give a load to the switch.

 (6)  
Install the locking screw in the clamp.

 S 434-024
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
757
MAINTENANCE MANUAL

 (7)  S 494-031Connect the copper wire (the end that comes out of the PTT switch hole) to the switch wires.
 (8)  S 434-052Pull the switch wires through the PTT switch hole with the other end of the copper wire.
 (9)  S 094-032Disconnect the copper wire from the switch wires.
 S 434-033

 (10) Use the insertion tool to connect the switch wires to the quick-disconnect terminals (see Fig. 401, detail B).
 S 434-037
 CAUTION: MAKE SURE THE WIRE CLAMP AND THE CENTER CABLE COIL IN THE HUB
_______ OF THE CONTROL WHEEL ARE INSTALLED AT THE POSITION SHOWN IN FIG. 401. FAILURE TO INSTALL THE COIL IN THE CENTER CAN RESULT IN TOO MUCH FRICTION AND CAUSE DAMAGE TO EQUIPMENT.
 (11) Install the quick-disconnect terminals bundle in the control wheel with the cap-nut.
 NOTE: Set the wire clamp to make sure that the cable coil is in
____ the center of the control wheel.
 S 824-053
 (12) Tighten the cap-nut to 20 inch pounds.
 S 434-078
 CAUTION: ENSURE THAT WIRE GAURD ASSEMBLY SLIDES SMOOTHLY IN GROOVE OF
_______ WHEEL ASSEMBLY DURING INSTALLATION. KEEP ALL WIRES AND CONNECTORS CLEAR OF PLANE OF GROOVE TO PREVENT POSSIBLE WIRE INSULATION DAMAGE DURING ASSEMBLY.
 (13)
 Install wire guard assembly.  Insert lower end of wire guard assembly inside base of wheel. Firmly press upper edge of seal until guard is below medallion groove.
　
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