(a) Make sure the 0 dB light on the PA amplifier comes on.
S 864-041
(3)
Set the function switch to NORM.AIRPLANES WITH COLLINS PA AMPLIFIER; PA Amplifier Installation Test
S 864-042
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-043
(2)
Turn the function select switch on the PA amplifier to LEVEL.
(a) Make sure the front panel display reads 69.0 to 71.0 VRMS.
S 864-044
(3)
Turn the function select switch to OPERATE.Put the Airplane Back to Its Usual Condition
S 414-028
(1)
Close the access door, 119BL (AMM 06-41-00/201).
S 864-024
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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757 MAINTENANCE MANUAL
PSU SPEAKER - REMOVAL/INSTALLATION
__________________________________
1. General_______
A. This procedure has two tasks. The first task removes a PSU speaker. The second task installs the speaker and does a test of the installation.
B. PSU speakers are installed in the passenger service units (PSU) in the passenger compartment.
TASK 23-31-02-004-001
2. PSU Speaker Removal___________________
A. Access
(1) Location Zones
200 Upper half of Fuselage
B. PSU Speaker Removal (Fig. 401)
S 864-002
(1) Open this circuit breaker on the overhead circuit breaker panel, P11, and attach a DO-NOT-CLOSE tag.
(a) 11C22, PASS ADRS AMPL
S 014-004
(2)
Open the PSU oxygen-light spacer panel (PSU panel) for the PSU speaker assembly:
(a)
Push a small screwdriver (or other applicable tool) into the access hole on each side of the PSU panel to release the latches.
(b)
Lower the PSU panel until the lanyard holds it.
(c)
Remove the hook from the loop on the PSU.
(d)
Lower the PSU panel to the full length of the lanyard.
(3)
Disconnect the wires from the terminals of the speaker transformer.
S 024-008
(4)
AIRPLANES WITH SPRING-MOUNT SPEAKERS;
Remove the speaker from the panel assembly:
S 034-007
(a) Move the two torsion springs that attach the speaker.
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757
MAINTENANCE MANUAL
OVERHEAD
STORAGE
BIN
ACCESS HOLE
FWD ACCESS HOLE
PSU ACCESS
SEE A
PSU
LOOP SPEAKER ASSEMBLY
LANYARD SEE C
OUTBD
PSU PSU (BOTTOM VIEW)
(LOWERED) HOOK
B
SEE B TERMINALS
PSU ACCESS
(4 LOCATIONS)SPEAKER
A
TERMINALS (4 LOCATIONS)SPEAKER SPEAKER TRANSFORMER
NUT AND WASHER (2 LOCATIONS)SPEAKER
TRANSFORMER
TORSION SPRING
(2 LOCATIONS) PSU SPEAKER ASSEMBLY (STUD MOUNTED)
PSU SPEAKER ASSEMBLY (SPRING MOUNTED)
C
PSU Speaker Installation
Figure 401
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757 MAINTENANCE MANUAL
(b)
Lift the speaker to remove it from the panel assembly.
(c)
Keep the gasket for the installation.
S 024-009
(5) AIRPLANES WITH STUD-MOUNT SPEAKERS;
Remove the speaker from the panel assembly:
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