Specifications

4-3
CANCEL
Many of the screens used during set-up, alignment, or diagnostics contain a "Pop-
Up" screen within the main screen. The CANCEL key is used to cancel the current
pop-up operation being performed and restore any data that was changed during the
pop-up screen operation.
OK
This key is used to accept and store the current setting in a pop-up screen.
EXIT
This key is used to signal completion of an adjustment procedure or select the
previous screen.
4.1.3 Other Controls and Indicators
To the right of the display is another window showing the selected fader level. As
with previous generations of Dolby cinema processors, a fader setting of "7.0" is the
nominal correct operating level. This setting matches the level used during the film's
production. As the main fader (or front panel knob) is turned, the numbers on the
display will move from zero to ten. The main fader rotates continuously with no
end stops. The number displayed will always indicate the current level setting.
Mute On
Bypass
The MUTE button is used to fade the sound down without disturbing the current
fader setting. A green LED, MUTE ON, located above the fader level display will
flash, indicating that the CP500 outputs are muted.
A BYPASS LED is located to the left of the MUTE ON LED. As with other
Dolby cinema processors, the CP500 utilizes a separate back-up power supply
which is used during emergency operation. If the CP500 is operating in bypass
mode, this red LED will come on (not flashing). If there should be a failure, the
system can switch into bypass mode either temporarily or permanently. The
minimum electronics required for a bypass output signal from the CP500 is:
• Functioning bypass power transformer (external module)
• Cat. No. 661 Optical Preamplifier card
• Cat. No. 682 Analog Output card
• Cat. No. 683 (optional) Crossover card, if used in a bi-amplified
installation.