Operating instructions

B-1
APPENDIX B
DOLBY TEST AND DEMONSTRATION FILMS
Several test and demonstration films produced by Dolby Laboratories
are available from your equipment supplier. For proper system
maintenance, the Cat. No. 69T test film is required and the Cat. No. 251
Jiffy Test Film is strongly recommended. The Cat. No. 69T test film
should be formed into endless loops for ease of use. The eight-minute
color short “listen . . .” (Cat. No. 351) is an excellent way to demonstrate
in an entertaining way your commitment to a quality presentation.
Three test films, Cat. Nos. 69N, 97, and 151, are for use only by a trained
engineer with special test equipment; they are mentioned here so you
know what they are should you ever come across them.
Cat. No. 69T: Dolby Tone
This film is required to maintain your theatre system. The Dolby Tone
recorded on the film is for adjusting Dolby Level as instructed on page
2-2; this simple adjustment must be performed whenever an exciter
lamp is replaced and should also be performed from time to time to
compensate for the normal aging (and reduced light output) of exciter
lamps.
Cat. No. 251: Jiffy Test Film
This eight-minute test film is strongly recommended to help keep your
system sounding its best. No special equipment is required because the
tests have been specifically designed to permit subjective judgment by
ear. Each test is described by either a male or female voice and is
supplemented by captions on the screen which help identify the causes
of sound system problems. Visual checks are also included to assist in
identifying some picture projection problems.
Tests provided on the Cat. No.251 include: Level Set, Channel
Identification, Channel Level and Loudspeaker Equalization,
Loudspeaker and Amplifier Condition, Projector Wow and Flutter,
Overall System Performance, Visual “Quick-checks,” and a Noise and
Interference Test.
Duration: 8 minutes
Picture format: 35mm color, can be screened either 1.85:1
wide-screen or 2.35:1 anamorphic
Sound format: 04 Dolby Stereo A-type