Dolby
®
Model CP650 Installation Manual
A-Chain Alignment
5-4
Automatic
Optical Level Adjust
Projector 1
Press OK When Ready.
L O O R
Please Wait. O O
....... O O
O O
Unable to complete
Level adjustment.
Press OK to continue
5.4
Dolby Level Set
Mic Bypass
Video Clamp
Ch 1
Ch 2
GND
RTA1 RTA2
1 2 3
7
4 5 6
8
SIGNAL
PRESENT
Lt
Rt
Lt
Rt
Oscilloscope
Connect the oscilloscope to the Lt and Rt test
points.
1 2 3
7
4 5 6
8
Slide DIP switch 6 to the up position. This
switches the CP650 into setup mode.
Press the left menu button multiple times to
move the display to
Automatic Optical Level
Adjust Projector 1.
Proj 1
Thread and play a Dolby Tone test film,
Cat. No. 69T on projector 1. The film emulsion
should face away from the screen.
Verify that the signal presence LEDs on the
CP650 setup panel are illuminated. The Dolby
tone signal should be visible on the
oscilloscope.
Listen to the tone on the booth monitor to
identify any problems with distortion or
unwanted film playing speed variations.
OK
Press the OK button to begin the automatic
level calibration for projector 1.
Perform automatic calibration for Projector 2 if
the theatre is equipped with a second projector.
OK
x2
If there is a problem with automatic
calibration, this screen will appear.
In this case, press the OK button to return to
the Automatic Optical Level adjust screen,
then press the left menu button twice to move
to
Manual Optical Level Adjust
for
Projector 1.
