5-54

 

 

 

 

 

 

 

B-Chain Alignment Procedures

 

 

 

j. Final Checks

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step

Action

Indication

 

No.

 

 

 

 

 

 

 

 

 

 

 

1

NORMAL BYPASS

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

04

Dolby Stereo

A-type

 

3

JIFFY

TEST FILM

CN 251–A subjective film for testing theatre sound

RECORDED IN

Running time: 8 minutes.

Picture format: 1.85:1 widescreen or 2.35:1 anamorphic.

Sound format: 04

stereo optical with surround

Dolby Laboratories, 100 Potrero Avenue,

San Francisco, CA 94103-4813

Telephone 415-558-0200, Telex 34409, Facsimile 415-863-1373 Dolby, the Double-D symbol and Dolby Stereo are trademarks of Dolby Laboratories Licensing Corporation. S89/4784/8690

listen…

4

CN 351–The Stereo Demonstration Film

 

 

RECORDED IN

NORMAL BYPASS

Running time: 8 minutes.

Picture format: 2.35:1 anamorphic.

Sound format: 04

stereo optical with surround

Dolby Laboratories, 100 Potrero Avenue,

San Francisco, CA 94103-4813

Telephone 415-558-0200, Telex 34409, Facsimile 415-863-1373 Dolby, the Double-D symbol and Dolby Stereo are trademarks of Dolby Laboratories Licensing Corporation. S89/4784/6776

5-55

B-Chain Alignment Procedures

j. Final Checks

Notes

Verify that the NORMAL/BYPASS switch is in the NORMAL position.

Press the format 04 Dolby Stereo A-type switch.

Thread and play the Dolby Cat. No. 251 “Jiffy” test film, if available, for a quick check of the system alignment. This film contains a series of tests, each of which is described by a male or female voice and is supplemented by captions on the screen to help identify the causes of sound problems. Visual checks are also included to assist in identifying some picture projection problems.

Remove the “Jiffy” film, return to NORMAL

Play the Dolby Cat. No. 351 “listen . . .” film on the newly aligned system. The film consists of a wide variety of short scenes — both live action and animated. Each scene was selected to demonstrate different aspects of stereo sound. Evaluate the quality of the sound. If problems occur, contact the technical staff at Dolby Laboratories.

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Image 66
Dolby Laboratories CP65 manual Chain Alignment Procedures Final Checks, Press the format 04 Dolby Stereo A-type switch