Dolby Laboratories CP65 manual Chain Alignment Procedures Final Checks

Page 66

 

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.

Image 66 Dolby Laboratories CP65 manual Chain Alignment Procedures Final Checks, Press the format 04 Dolby Stereo A-type switch
Contents Model CP65 Cinema Processor Dolby Laboratories Inc Headquarters Table of Contents Section Reference Block Diagrams Introduction Page Section Equipment Required Smpte Buzz Track Stereo Optical Surround Level Cat. No Jiffy Test Film Cat. No 2 Listen . . . Film Cat. NoSection Initial SET-UP and Installation Voltage Acceptable Setting Voltage Range Fuse Type Next, check the jumpers in the following locations Cat. No , Power Supply Module Cat. No , B-Chain CardCat. No , Control Logic Card J2 NON-SYNCCP65 Backplane Standard CP65 or CP65ACP65-300 High Low Subwoofer subwoofer Output output These Modules are Necessary for Bypass Operation Reduction Module Slot Card Function Cat. NoTwo-channel Noise Channel DecoderContains a semi-regulated power supply with Voltage Setting Fuse Type InternationalIEC Notices HUM Problems Room lighting dimmer controls SCR-TYPEPage Section AN Overview of the Alignment Procedure Aligning the B-ChainPage Page Section Chain Alignment Preliminary Procedures Action IndicationLamp Voltage Optical Preamplifier Adjustments Chain Alignment Procedures Optical Preamplifier Adjustments 222 CAT. no Test Film Oscilloscope Traces Repeat CAT no Repeat 1 →Magnetic Preamplifier Adjustments Magnetic Alignment 100mV Section Chain Alignment Setting Room Equalization BypassLoudspeakers and Crossovers Amplifiers GeneralChain Alignment Procedures OffRepeat ActionChain Alignment Procedures Setting Room Equalization Do not adjust Paul Setting Room Equalization b. Adjusting L,C,R Gain 14 → 21 R 14 →Setting Mono Gain 79 dBCChain Alignment Procedures Subwoofer Alignment Cat. No 90 dBC 85 dBCFrom Step NoSelect format 04 Dolby Stereo A-Type Same AS 441Surround Equalization Alignment Cat. No Surround Equalization Alignment Cat. No Notes Cat. No 441Desired 88 dBC Bypass Adjustment of Surround Delay Thumbwheel SwitchMsec Setting Chain Alignment Procedures Adjustment of Bypass Gain Xx dBCFrom Xx dBC -3 dB Yy dBCAdjustment of Non-sync Gain Press the format 60 non sync switchAuto Freq Adjustment of Mono Gain and Equalization Notes Repeat page 5-20 StepChain Alignment Procedures Final Checks Press the format 04 Dolby Stereo A-type switchSection Reference Diagrams Cat. No Dual Noise Reduction Module Inputs Cat. No Optical Bass Extension and Surround Equalizer Card Cat. No B-Chain Facilities Card Cat. No Power Supply Card Cat. No Transformer Module Inputs Cat. No Control Logic Card Cat. No +24V +15V 15V +12B+15M Appendix a Checking Phasing of Speakers Appendix B Effect of Changes in Slit Height on Slit Losses Appendix C CP65M Mono Instructions OperationCat. No a Circuit Description Schematic Cat. No a Appendix D Backplane Connections List Terminal Block TB3Connector J18