Specifications

6-5
Analog Optical Alignment - Projector
FORMATS
FORMATS
Menu Cancel OK
Exit
On the CP500, press the
FORMATS
key. The
Current Format
screen will be
displayed.
Select
Format 01
,
Mono
.
OFF
POWER AMPS
Verify that the theater power amplifiers
are off.
TEST POINT
LED
LED
TEST POINT
RIGHT SIGNAL PRESENT
LED
RIGHT
TEST POINT
LEFT
LED
CAT. NO. 661
PROJ 1 SELECT
LEFT SIGNAL PRESENT
GND
PROJ 2 SELECT
Open the CP500 front panel, and
connect an oscilloscope to the test
points
Left
and
Right
on the Cat. No.
661 Optical Pre-amplifier card. as
shown. Ground the oscilloscope to the
GND
test point on the card.
Set the oscilloscope to dual trace mode
and be sure that the vertical range is set
the same on both channels.
Thread and play the Dolby Tone test
film Cat. No. 69T for an initial test of
the signal path through the projector
preamplifier. The film emulsion should
face away from the screen.
Verify that the signal present LEDs on
the Cat. No. 661 are lit. 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.