_
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4 An ALL ZONES LED comes on when the ALL ZONES mode is selected.
_
(g)
AUTO PRAGRAM section.
(h)
A key pad operates the screen menu.
(i)
MANUAL CONTROL board, ALL ZONES. 1 An ON/OFF/PWR membrane switch turns the PA for all zones on.
1_ A START membrane switch starts the AUTO PROGRAM mode.
2_ A STOP membrane switch stops the AUTO PROGRAM mode.
3_ A START LED comes on when the AUTO PROGRAM mode is selected.
4_ A STOP LED comes on when the AUTO PROGRAM mode is selected.
_ 2 A PA LED comes on when the ON/OFF/PWR membrane switch is
_ selected.
3 A SOURCE/SEL membrane switch sets the video source to be
_ displayed on all the video monitors and the associated audio channel.
4 A VTR indicator comes on when VTR is selected.
_
5 A PRI indicator comes on when PRI is selected.
_
6 A SEC indicator comes on when SEC is selected.
_
7 A digital display shows the video source.
_
8 An ON/OFF/PWR membrane switch to turn on all video displays.
_
9 A PWR LED comes on during the power up of the ON/OFF/PWR
_ membrane switch.
(j) MANUAL CONTROL board, VTR CONTROL. The VTR can be controlled from the SCU.
1 A SEL membrane switch when selected, controls the related VTR
_ in the STOP, REW, PLAY or FF mode.
2 A digital display shows the selected VTR.
_
3 A STOP membrane switch stops the tape cassette.
_
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4 A STOP LED comes on when the VTR stops.
_
5 A REW membrane switch rewinds the tape cassette.
_
6 A REW LED comes on when the VTR rewinds.
_
7 A PLAY membrane switch starts the tape cassette playing.
_
8 A PLAY LED comes on when the VTR plays.
_
9 A FF membrane switch runs the tape cassette fast forward.
_ 10 A FF LED comes on when the VTR runs fast forward.
__
(k) ETI meter The ETI meter is a multi digit Elapse Time Indicator which can not be reset. It shows the total time of operation for the video system.
(3) Not Applicable R **ON A/C 051-099, 151-199, 201-210,
B. Video Tape Reproducer (VTR) (Ref. Fig. 007) Two identical VTR, 12MH and 13MH, serve the system. Either one can be used to reproduce the contents of a video. Therefore the subsequent paragraph describes the functions of only one VTR.
(1)
General
(a)
A compact, lightweight, front-loading cassette reproducer with six audio outputs is installed in the video control center.
(b)
Electrical connections are made through connector J1 on the rear of the unit. All input/output data from/to the SCU are connected through the prewired mounting plate 10MH to connector J1.
(2)
Control Elements
(a) On the front panel of the VTR are:
-
the mementary - action push switches STOP, REW (rewind), PLAY, FF (fast forward), and EJECT,
-
the indicator lights POWER, TAPE IN and STANDBY
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Video Tape Reproducer (VTR)
Figure 007
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(b) The SCU touch-screen permits control of the VTR functions REW, PLAY, FF and STOP.
(3)
Description
(a)
The VTR uses a rotary playback system with three pairs of heads and has a forward speed of 23,39 mm/sec in PAL mode or 33,35 mm/ses in NTSC mode. An automatic rewind is provided.
(b)
A high density, 1/2 in. width VHS/S-VHS cassette tape is used to provide approximately 120 minutes of prerecorded video program. For video-program sound distribution two magnetic audio sound-tracks for dual language or stereo programming are used.
(c)
The subsequent video signal color formats are automatically set.
-PAL
-NTSC
(4)
Random-Access Tape Operation When a programmed tape is used the VTR reads the data recorded at the start of the tape. These data contain information about the programmed tape segments. When these data are read by the VTR, the operator can set the program segments through a special procedure on the SCU touch-screen (Ref. Para. 6. Operation).
(5) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM Communications 通讯2(37)
