Dolby Laboratories CP650, Руководство по установке

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Dolby
®
Model CP650 Installation Manual Front-Panel and Alignment Overview
3-2
Front-Panel Display
L Le C Re R Rs Bsr Bsl Ls SW
Figure 3-2
Front-Panel Display Showing All Possible Channels Active
Day-to-day operation of the CP650 is performed through interaction with this display.
The 20-character, four-line LCD provides a read-out of processor condition and
operation mode. It can be used by the service engineer to align the CP650 if PC setup
software is not used.
Figure 3-2 shows the display that is active when the CP650 is processing and playing
a digital signal connected to the CP650 input with all channels active. The top two
lines display the current format, which in this case is Dolby
®
Digital Surround EX TM ,
with five screen channels active. The bottom left area contains an active bar graph
display of the sound signals present on each channel. The bars move, confirming that
sound is passing through the CP650.
The bars are displayed starting with the Left screen channel, and moving clockwise
around the auditorium:
Left screen, Left Extra screen, Center screen, Right Extra screen, Right screen,
Right Surround, Back Surround Right, Back Surround Left, Left Surround,
Subwoofer.
The L on the display indicates that fader control is set to local , meaning that the fader
knob on the front panel of the CP650 (and any Dolby remote box fader knob) controls
the sound level in the auditorium. If the display shows an
A , an external non-Dolby
auditorium fader knob controls the sound level.
M1 indicates that the projector 1 motor contact is closed or jumpered (motor-start
connector on the back panel). The motor running signals are used in the timing of
changeovers while running Dolby Digital films in a two-projector system.
The 0 shown on the bottom right is the Dolby Digital film error rate. The first
indication of satisfactory digital film playback is the detection of a low error rate. The
error rate is a number between 0 and 8. With a correctly aligned digital film reader,
most films will play at an error rate of
6 or lower. If the digital error rate exceeds 8 , or
if the display shows F (data not readable) or “ – ”(no digital soundtrack), the CP650
automatically switches to playing the film’s analog soundtrack until usable data
appears.