(a)  The tape reproducer is operated from the controls on the face of the unit. There are controls for selection and play of both boarding music and prerecorded announcements.

 (2)  
Music

 (a)  
The front face of the tape reproducer has MUSIC controls for volume and selection of music channel 1 or 2.

 (b)  
To playback boarding music program 1 or 2, press MUSIC channel button 1 or 2 and press the START button. Adjust music volume by rotating MUSIC control. Either music program may be stopped at any time by pressing the STOP button. The boarding music program being played may also be switched at any time by pressing the other MUSIC channel button.

 (3)  
Prerecorded Announcements

 (a)  
The front face of the reproducer has the controls for selecting and playing prerecorded announcements. The selection is made with a numerical keyboard which selects the desired announcement by number and displays the selection in the window. Upon selecting an announcement, boarding music will cease and the reproducer will search for and key at the start of the selected announcement. The READY light indicates the completion of the search mode.

 (b)  
Pushing the START button will initiate playing of the announcement. If START is pressed before the search is complete the search will continue and announcement playback will start immediately upon completion of search. The announcement will play to completion or until STOP is pressed, after which time the reproducer will return to the boarding music mode of operation before announcement selection.

 (c)  
An oxygen emergency announcement has priority over any other prerecorded announcement or boarding music. This announcement is not manually selected. It will play automatically and repeat upon closing of the OXY IND relay, R324. This relay closes as part of the sequence during activation of passenger oxygen.

 (d)  
All keyboard, START, STOP, and channel 1 or 2 buttons backlight when pushed. The channel selection 1 and 2 buttons are push-on/push-off. All other buttons are momentary.

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737-300/400/500MAINTENANCE MANUAL
 (e)  All the programs are on one C-60/90 Phillips four channel cassette tape. Two of the channels are for boarding music; one for selected announcements and the remaining channel for the emergency oxygen announcement.
 (4)  To open the door holding the cassette tape, display 90 in the window and push MUSIC channel switch 1.
 T. Tape Reproducer (Equipment bay type)
 (1)  
The tape reproducer is operated from the MUSIC control on the forward attendant panel. Rotating the MUSIC control clockwise from the OFF position powers the capstan drive within the tape reproducer. The MUSIC control also controls the boarding music volume and provides the PTT 4 (priority 4) input to the PA amplifier.

 (2)  
The boarding music program is recorded on two reels of 1/4-inch magnetic tape (3-3/4 IPS) providing playing time of three hours. The tape will play in both directions with automatic switching during tape reversal to provide continuous entertainment.

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PASSENGER ADDRESS SYSTEM - TROUBLESHOOTING
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 1.  General_______
 A.  Troubleshooting the passenger address system is most easily done if a comparison of the operation at different stations is done. Since there are few major components which may be interchanged, one must rely on the similarities between attendant's controls and pilots' controls to isolate trouble spots in the audio or the control circuitry.
 B.  If a system does not operate, the first check will be for correct power to the system. Make sure the correct circuit breakers on the P6 panel are closed. Only a few primary parts can be removed. Operate the passenger address system from two different areas. This will help to find the problem.
　
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