Installation manual

DTS-6 Installation Manual Section 4: Checkout and Adjustment
4-4
4.2 Timecode Reader Adjustment. See Figure 4.
• Eject the SETUP DISC and insert the DTS 6-TRACK DEMONSTRATION D-1 disc.
Thread the DEMO REEL through the projector and the DTS reader head.
• The DEMO REEL has a specially printed leader for setting the timecode head offset.
Start with the offset measurement start mark, “00”, at the timecode head’s red LED
(inside the lens). Read the number at the projector’s optical sound head and set the DTS
processor TIMECODE HEAD OFFSET switches to this offset number. The offset number
must be between “15” and “70”. If the offset is not within these parameters, relocate the
reader head(s) on the projector(s) until a valid number is achieved.
• If you do not have a DEMO REEL, you can still set the offset switches by counting the
number of picture frames from the DTS reader head red LED (lens) to the projector’s
picture (“film”) aperture. Multiply the result by 1.25 and subtract one. Set the
TIMECODE
HEAD OFFSET
switches to this number. EXAMPLE: 27 frames X 1.25 = 33.75 - 1 =
32.75 offset. Round this number off to the next whole number. So, “33” would be your
offset number.
REMEMBER: If you use the counting frame method, frames are counted from the timecode
reader lens to the picture aperture. If you are using the numbered film strip method, thread
projector with the “00” at the timecode reader lens and read the number at the optical sound
head (solar cell).
IMPORTANT: Be sure to make the same size film loops inside the projector when
measuring the offset as you do when running a movie. Failure to do so will result in
improper sync when the movie runs in DTS.
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••
• Run the DEMO REEL. The green light on the Timecode Reader Head should light
when timecode is read. The light should be bright and steady.
•
••
• Listen test. Go into the theater. Watch and listen to the demo film. Verify the sound
sync to picture is correct. Check the front and back of the theater. If any delay is seen
adjust the TIMECODE HEAD OFFSET switches as necessary to obtain proper sync.
- Listen through the entire reel to be sure that no distortion or breakup occurs. If you are
a change-over theater, run the demo film a second time through the other projector.
•
••
• Check the fail-safe operation.
- While the film is running in digital, slip a business card into the timecode reader head,
(between the film and the lens as to block out the timecode from being read) for at least
six seconds, while the show is running. The cinema processor should switch back to the
optical format.
- There should not be a dramatic level difference between optical and digital sound (in a
quiet scene). If there is, recheck the “B” chain and the DTS-6 level settings.
- Remove the business card and verify the cinema processor switches back to digital
format within six seconds.