A50435
5C8 Passenger Address System Circuit
Jun 20/92 Figure 2 23-31-0
Page 9
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
PASSENGER ADDRESS SYSTEM - TROUBLE SHOOTING
1. General
A. The following trouble shooting procedures are based on performance of the system operational test and are presented in a tree-type format to aid in rapid fault isolation.
B. When a test step does not check out, find the box containing the trouble symptom and perform the stated action. Continue to follow a single line by analyzing the results of each test step until the required corrective action is determined. Perform the specified corrective action, then repeat the step at which the failure was encountered and complete the test to check out the system.
C. All trouble shooting procedures are based on the assumption that wiring is OK and that electrical power is available. If the corrective action in the procedure does not correct the problem, check wiring using the wiring diagram.
2. Prepare for Trouble Shooting
A. Provide ground electrical power to airplane.
B. Ensure that passenger address and flight interphone circuit breakers on P6 are closed.
545
Aug 01/74 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 23-31-0 Page 101
K90567
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23-31-0 Page 102 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Aug 01/74
PASSENGER ADDRESS SYSTEM - MAINTENANCE PRACTICES
1. General
A. The following is a speaker test that applies to all airplane installation configurations. A random noise input is applied to the microphones and the speaker audio output is measured. This is not a passenger cabin audio level test. The passenger cabin audio level is a function of speaker size and the number of speakers installed in the cabin. Basic airplane design determines the number of speakers installed. If the individual speaker audio level output is within specified tolerances, the passenger cabin audio level will meet minimum requirements.
2. Equipment and Materials
A. Random Noise Generator - Model 543-1, Pacific Electro Dynamics
B. Sound Level Meter - GR-1565-A, General Radio
3. Prepare to Test
A. Provide electrical power to airplane.
B. Check that all interphone and PA system circuit breakers are closed.
4. Test Passenger Address System
A. Closely couple noise generator to sound level meter.
B. Set sound level meter to C weighted scale.
C. Set noise generator PWR/PTT switch to ON and OUTPUT switch to SPKR. Check that sound level meter indicates 100 .1 dbA.
NOTE: If reading is outside tolerance, check batteries of both units. If batteries are good adjust noise generator for correct output.
D. Closely couple noise generator to PA microphone/handset at flight crew station.
E. Press PTT switch on microphone/handset.
F. Closely couple sound level meter to cabin speaker, moving meter across face of speaker for maximum indication on meter.
NOTE: Do not measure output of speaker while meter is in motion as noise generated by movement may give a false indication.
G. With sound level meter set to C weighted scale, check that speaker output is 99 +10-2 dbA.
H. Disconnect D752 at engine no. 1 low oil pressure switch. Check that speaker output level increases by 6 dbA. On airplanes incorporating SB 23-1060, both engine oil pressure switches are connected with the passenger address system amplifier.
I. Reconnect D752. Check that speaker output level returns to reading obtained in step G.
J. Repeat steps D thru G for remaining passenger cabin speakers.
K. Repeat steps D thru G for other PA microphones/handsets.
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