Dolby Laboratories CP45 Provozní pokyny

MODEL CP45CINEMA PROCESSORUsers' Manual

1-3• 64 Mic: for public address announcements in the theatre.The film soundtrack format numbers used on the CP45 front panel oftenappear on the film

1-4• Fade out the intermission music with the local front panel fader.• Move to the remote location and see that the fader there is at 7.• Select the

1-5be sure that the projector is not selected. If you are playing anoptical film print, be sure that there are no signals present fromany of the othe

1-6WARNINGThe CP45 was adjusted initially by aspecially-trained engineer so that yourtheatre would have the same standardplayback characteristics as t

2-1SECTION 2MAINTENANCE AND ADJUSTMENTSThe installation of the Dolby CP45 in your theatre indicates a commitmentto providing a high-quality presentati

2-2Figure 2 Never touch the solar cellB. PRINT CLEANLINESSA high fidelity Dolby Stereo theatre system is like a high-quality homestereo system: it c

2-35. Locate the Cat. No. 510 card and Cat. No.222 noise reduction module. (Dolby Leveladjustments are made on the Cat. No. 510while the LEDs on the

2-46. Turn the projector on.7. As the test loop is played, watch the LEDs on the Cat. No. 222A/SR. Correct Dolby Level is indicated when the two ce

3-1SECTION 3TROUBLESHOOTINGYour theatre sound system consists of a number of critical audiocomponents in addition to the Dolby CP45. Thus, the first

3-2• If you know why power was lost and is now back, (there is one ormore LEDs alight in the pushbuttons) check that the format isappropriate and swit

USERS' MANUALFORMODEL CP45 CINEMA PROCESSORDolby Laboratories IncU.S.A. 100 Potrero Avenue, San Francisco, CA 94103Tel: 415-558-0200; Fax: 41

3-3CP45 transformers, the bypass transformer wires must have comeunscrewed from the back panel connections or, (this is veryunlikely) the transformer

3-4• If the indications are that the fault is in the CP45, perform thechecks below after you have turned off the power amps to preventloud thumps in t

Trouble Probable Cause Recommended ActionNo sound output.No LEDs lit.CP45 does not respond tocommands.No power to CP45 Check that the power blocks are

3-6D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionThere is hum in the output. (Youcan detect hum coming from the

3-7D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionAll channels fail when playing amovie and Bypass does NOTbring

3-8D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionOne channel fails. Defective power amplifier or wiring for tha

3-9D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionThe sound from one channel isdistorted (you can detect thedist

3-10D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionWhen a stereo film is projected,the sound appears to be comin

3-11D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionYou hear an echo in a smalltheatre.Surround sound delay set i

3-12D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionProjector changeover commanddoes not change to sound outputof

TABLE OF CONTENTSINTRODUCTIONSECTION 1OPERATING INSTRUCTIONS ...

3-13D. TROUBLESHOOTING PROCEDURES (cont'd)Trouble Probable Cause Recommended ActionYou cannot change from local toremote fader operation.The rem

A-1APPENDIX AHOW TO TELL A STEREO OPTICAL PRINT FROM A MONOPRINTA Dolby encoded optical print should be identified as such on both the film canand lea

B-1APPENDIX BDOLBY TEST AND DEMONSTRATION FILMSSeveral test and demonstration films produced by Dolby Laboratoriesare available from your equipment su

B-2Cat. No. 69T Dolby Tone Test FilmJIFFYTEST FILMCat. No. 251 SR•D—A subjective film for testing theatre soundRECORDED INRunning Time:Picture format:

B-3Cat. No. 351 Stereo Demonstration Film: “listen . . .”“listen . . .”, an eight-minute Dolby Stereo demonstration film for publicexhibition, has be

B-4Interior view of CP45 showing cards installedINPUTINPUTPOWERPOWERACACDCDC150 mS150 mS140 mS140 mS130 mS130 mS110 mS110 mS100 mS100 mS80 mS80 mS70 m

C-1APPENDIX CCP45 MODULE DESCRIPTIONSCat. No. 510/514 Input/Output CardThe Cat. No. 510 is the input and output part of the CP45. It has twostereo in

C-2The card also contains the controls for selecting the format of the film tobe shown or for selecting background music etc.Cat. No. 515 Stereo Surr

D-1APPENDIX DABOUT DOLBY FILM SOUND FORMATSThe application of Dolby A-type noise reduction to film soundtracks, asexplained in Appendix G, “Cinema Sou

D-2enable the soundtrack to carry louder sounds with lower distortion and fewersignal losses. The result is a dramatic improvement in soundtrack dyna

APPENDIX CCP45 MODULE DESCRIPTIONS... C-1APPENDIX DABOUT DOLBY FI

D-33. Why Adjusting Dolby Level Is ImportantThe accurate reproduction of Dolby soundtracks requires that the decoders inthe theatre act as precise m

D-4Dolby B-type was the first Dolby system developed for consumer applications,and is in use today in hundreds of millions of cassette recorders and o

E-1APPENDIX EHOW FOUR CHANNELS ARE DERIVED FROM DOLBYSTEREO OPTICAL PRINTSThe 35-mm Dolby Stereo optical format calls for the recording in the studio

E-2recorded on both the left and the right tracks. And the surround informationis also split between the two channels, but is recorded with a distinc

F-1APPENDIX FOPTICAL BASS EXTENSIONDolby Laboratories developed the optical bass extension (OBE) circuitry foruse with subwoofers — special bass louds

G-1APPENDIX GTHE EVOLUTION OF DOLBY FILM SOUNDThanks to such developments as multichannel sound, the motion pictureviewing experience today is more ex

G-2This caused a dilemma for soundtrack recordists. Should the tracks berecorded to take advantage of the improved speakers, or should they beprepared

G-3Many theaters were equipped for magnetic sound in the 1950s, eventhough the playback equipment was expensive. Many films were issuedwith magnetic s

G-4An important advantage of the Dolby optical format is that thesoundtracks are printed simultaneously with the picture, just like monoprints. Thus a

G-5analog track on the same 35 mm prints. This Dolby Digital format is yetanother significant step forward in film sound, providing independentleft, c

iINTRODUCTIONWHY A CINEMA PROCESSOR?Originally, stereo sound on motion picture film was possible only by means ofmagnetic striping, which was introduc

G-6Making Films Sound BetterDolby format release prints and the equipment which reproduces themare only links in a chain that extends from the origina

iiAbout The Dolby CP45Once installed, the Dolby CP45 Cinema Processor becomes the heart of yourtheatre sound system. All sound sources are connected t

iii• Section 3, Troubleshooting, will help you track down problems in thesound system without test equipment. It consists of a troubleshootingchart an

1-1SECTION 1OPERATING INSTRUCTIONSA. NORMAL OPERATION1. Initial Power-UpEach time the CP45 is connected to power, it automatically sets itself tothe f

1-2Figure 1. CP45 Front Panel ControlSignalSignalSystemSystemFormatFormatFaderFaderfaderfaderactiveactiveNormalNormalBypassBypassLeftLeftRightRightCe