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757 MAINTENANCE MANUAL
(b) The test switch should be released to the NORM position for a return to normal operation.
(3) Speaker System Test
(a) Setting the test switch to the SPKR TEST position provides a test tone output to the PA speakers. 1) The calibrated tone is provided via the main and auxillary
outputs. 2) All gain circuits are overridden and PTT inputs are
disabled. 3) The test tone is audible on all PA speakers. 4) The OVERLOAD light remains out.
(b) The test switch should be returned to the NORM position for a return to normal operation.
C. AIRPLANES WITH COLLINS PA AMPLIFIERS; BITE
(1)
PA Amplifier Front Panel
(a) A four-position function select switch and three-digit LED display enable proper operation of the PA system to be verified.
(2)
PA Amplifier Test
(a) OPERATE - Normal operating mode for the PA amplifier. Switch should be returned to this detented position whenever test are complete. The LED test meter remains off in this mode.
NOTE: The function select switch must be in the OPERATE
____ position for normal operation.
(b)
TONE - This mode provides a functional test of all speakers. A high chime tone (587 Hz) is continuously generated out to all speakers in the detented position. The LED test meter remains off in this mode.
(c)
LOAD (OHMS) - This mode measures the impedance of the speaker network at 587 Hz. No audible tone is heard on the speakers. The LED test meter displays 000 to 999 ohms. If upper limits are exceeded both decimal points will illuminate. This position is spring-loaded and will return to the TONE position when released.
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757 MAINTENANCE MANUAL
(d) LEVEL (VRMS) - This mode measures the PA amplifier output voltage to the speakers. The output is dissipated into an internal dummy load and the speakers are disconnected. The LED test meter displays 00.0 to 99.9 VRMS. If upper limits are exceeded both decimal points will illuminate. This position is spring-loaded and will return to the OPERATE position when released.
D. Control_______
(1)
Power
(a)
Supply electrical power (AMM 24-22-00/201).
(b)
Check the PASS ADRS AMPL (PASS ADRS) and INTERPHONE CABIN SERVICE circuit breakers are closed on overhead panel P11.
(c)
Check the TAPE REPRO AC (TAPE RPDR) circuit breaker is closed on panel P37.
(2)
Boarding Music Control
(a)
Rotate MUSIC control clockwise on fwd attendant panel P21.
(b)
Adjust boarding music to a comfortable listening level.
(3)
Control for Voice Announcements
(a)
Lift the attendant handset from the hook.
(b)
Push the PA call switch.
(c)
Push the PTT switch.
(d)
Speak into the microphone to make the announcement.
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757 FAULT ISOLATION/MAINT MANUAL
PASSENGER ADDRESS SYSTEM
COMPONENT FIG. 102 SHT QTY ACCESS/AREA REFERENCE AMM
LAVATORY, LAV D, M10015 S10179 SWITCH - BOARDING MUSIC REMOTE CONTROL, PSU, YUTM002 PSU, YURM002 PSU, M10343AUDIO ACCESSORY, M108 UNIT - (FIM 23-42-00/101) PA, B10140 PA, B10116 PA, B10114 PA, B10112 PA, B10111 PA, B10110 PSU, M10342 LAVATORY, LAV T, M10679 AMPLIFIER - PASSENGER ADDRESS, M177 MUTING, YUTK001 MUTING, K10503 NO SMOKING, K10029 FASTEN SEAT BELT, K10028 LEFT ENG START TO STOP, K10212 OXYGEN DEPLOY INDICATION, K10038 RIGHT ENG START TO STOP, K10224 RELAY - (FIM 31-01-34/101) RELAY - (FIM 31-01-36/101) FORWARD ATTENDANT, P21 PANEL - (FIM 33-22-00/101) DIODE-MUTING, K10270 MUTING, K10498 MUTING, K10500 RELAY -TAPE REPRO DC, C4027 CIRCUIT BREAKER -PASS ADRS AMPL, C548 TAPE RPDR AC, C4028 CIRCUIT BREAKER -BOX - (FIM 23-32-00/101) VIDEO JUNCTION, M10668 REPRODUCER - BOARDING MUSIC TAPE, M10031 LAVATORY, LAV C, M10014 LAVATORY, LAV A, M10012 SPEAKER -RELAY - (FIM 31-01-37/101) REPRODUCER - (FIM 23-34-00/101) ENTERTAINMENT TAPE, M130 5 6 2 2 3 3 1 1 3 4 1 2 2 LAVATORY, LAV F, M10676 2 2 2 2 1 1 --1 2 1 11 2 * 21 1 1 1 1 1 1 *2 11 1 1 1 1 1 1 * 1 1 1 PASS. CABIN, MID RIGHT LAV PASS. CABIN, FWD ATTND PANEL, P21 PASS. CABIN, MID ATTND STA PASS. CABIN, PSU MODULES PASS. CABIN, MID ATTND STA PASS. CABIN, AFT R CEILING PANEL PASS. CABIN, MID L CEILING PANEL PASS. CABIN, MID R CEILING PANEL PASS. CABIN, FWD L CEILING PANEL PASS. CABIN, FWD R CEILING PANEL PASS. CABIN, AFT L CEILING PANEL PASS. CABIN, PSU MODULES PASS. CABIN, MID LEFT LAV PASS. CABIN, ATTND CEILING PANEL PASS. CABIN, MID L CEILING PANEL PASS. CABIN, ATTND CEILING PANEL PASS. CABIN, AFT L CEILING PANEL PASS. CABIN, FWD R CEILING PANEL 119BL, MAIN EQUIP CTR, E4-3 FLT COMPT, P11 11C22 11H34 119BL, MAIN EQUIP CTR, P37 37E2 119BL, MAIN EQUIP CTR, E4-3, TB141A 119BC, MAIN EQUIP CTR, E4-4 PASS. CABIN, FWD LEFT LAV PASS. CABIN, MID LEFT LAV PASS. CABIN, MID LEFT LAV 23-31-05 * 23-31-02 23-31-02 23-31-02 23-31-08 23-31-08 23-31-08 23-31-08 23-31-08 23-31-08 23-31-05 23-31-02 * * * * *23-31-01 * * * * 23-31-06 23-31-05 23-31-0523-31-05
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