(c)
Make sure you hear clear audio through the interphone speakers.
(8)
Remove electrical power if it is not necessary (Ref 24-22-00).
S 864-022
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A
757 MAINTENANCE MANUAL
CONTROL WHEEL PUSH-TO-TALK SWITCH - REMOVAL/INSTALLATION
________________________________________________________
1. General_______
A. A push-to-talk (PTT) switch is installed in each pilot's control wheel. The switch permits the pilot to use the PTT functions with two hands on the control wheel.
TASK 23-51-03-004-001
2. Remove the PTT Switch (Fig. 401)_____________________
A. Equipment
(1) Insertion and Extraction Tool (Duetch
No. M15570-20)
B. Consumable Materials
(1) G00628 30 inch length of copper wire (No. 18 to
22 gauge) - without insulation if possible
C. Access
(1) Location Zone
211/212 Flight Compartment
D. Prepare to Remove the PTT Switch
S 864-004
(1) For the Captain's PTT switch, open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11C25, INTERPHONE CAPT FLT AMPL or 11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR
(b)
11G29, INTERPHONE CAPT FLT AMPL or 11G29, INTERPHONE FLT AMPL ASP 1 R PWR
S 864-006
(2) For the F/O PTT switch, open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
(a) 11C26, INTERPHONE F/O OBS or 11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR
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757
MAINTENANCE MANUAL
MICROPHONE
LOCKING SWITCH
SCREW
SEE A
CLAMP
WIRING TRIGGER
SEE B
BALL
CATCH
PIN
DETENT PLATE
INTERPHONE SWITCH
SEE A
MOUNTING SCREWS
CLAMP
TRIGGER MICROPHONE SWITCH
A A
INTERPHONE SWITCH
0.39
INCH
0.37
PTT SWITCH ASSEMBLY A
3 4 22 PINK
22 WHT/RED
RT/PTT MIC SW
34
WHT/ORN
22
RED/BLK
22
PTT INTPH SW
NOTE: THE CHART HOLDER IS REMOVED FOR CLARITY.
CABLE COIL WIRE CLAMP
WIRE GUARD
CAP-NUT (TIGHTEN TO 20 POUND-INCHES)
QUICK-
DISCONNECT MEDALLION
TERMINALS
MEDALLION
SCREW
LOCKING
SCREW
TRIGGER
PIN CONTROL
MOUNTING SCREW WHEEL
A-A
DISC 9 PINK22
DISC 10 WHT/RED
22
DISC 16 WHT/ORN
22
DISC 21 RED/BLK
22
WIRING
B
Control Wheel PTT Switch - Installation
Figure 401
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757 MAINTENANCE MANUAL
(b) 11G30, INTERPHONE F/O OBS
or
11G30, INTERPHONE FLT AMPL ASP 2 R PWR
E. Remove the PTT Switch
S 014-058
(1)
Remove the medallion screw to remove the medallion and the chart holder.
S 034-010
(2)
Remove the cap-nut.
S 034-054
(3)
Pull out the wire bundle to get access to the quick-disconnect terminals.
S 034-011
(4)
Use an extraction tool to disconnect these wires from the
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