Dolby Laboratories CP500 Specifications Page 1

Film-TechThe information contained in this Adobe Acrobat pdffile is provided at your own risk and good judgment.These manuals are designed to facilita

SECTION 1INTRODUCTION1.1 About the Dolby CP500Dolby Laboratories has continuously established new benchmarks for motionpicture sound. The CP500 Digita

10-210.1.2 If One Channel Fails or is Distorted1. Open the front door of the CP500 and switch to Bypass using the pushbuttonswitch in the lower right

10-310.1.5 Excessive or Inappropriate Sound From Surround Speakers1. As an emergency measure to continue the show, switch off the surroundchannel powe

10-410.2 Between ShowsOpen the door and look at the three LEDs at the left edge of the Cat. No. 684system controller board. This is the horizontal boa

10-5three LEDs function as a signal meter. If the Cat. No. 681 LEDs are flashing butthese are not, then the Cat. No. 681 is defective, or the Cat. No.

10-6If this does not correct the problem, you can reset the entire CP500 by pressing thebutton located on the left hand end of the horizontal Cat. No.

10-710.2.3 Bypass Signal Path LEDsWhen the CP500 is operating in Bypass, the only LEDs that are active are the Cat.No. 661 optical preamp card located

10-8Symptom Probable Cause Recommended ActionNO SOUND AT ALLNo sound, front panel dark, no bypassLEDNo power to either main or bypass systems. See if

10-9Symptom Probable Cause Recommended ActionNO SOUND IN SOMEFORMATSNo analog film sound (Formats 01,04,05). Front panel normal, but Dolby Digitalsoun

10-10Symptom Probable Cause Recommended ActionFADER PROBLEMSFader level display indicates “Au” andfront panel fader has no effectAuditorium analog fad

10-11Symptom Probable Cause Recommended ActionRUMBLES, WHISTLES,HUM etc. IN SOUNDRumble in sound, regardless of format Audio grounding scheme may need

1-2CP500-SR• Dolby A-type and SR analog soundtrack decoding capability• Upgradable to Dolby Digital decoding by means of plug-in circuit cardsCP500-70

10-12Symptom Probable Cause Recommended ActionTROUBLE IN ONE ORMORE CHANNELSOne channel fails. Defective power amplifier, external crossover, orwiring

10-13Symptom Probable Cause Recommended ActionThe sound from two or more channels isdistorted (you can detect the distortion atthe booth monitor at no

10-14Symptom Probable Cause Recommended ActionThere is distortion when you play non-sync sound, but sound from the film is notdistorted.The non-sync s

10-15Symptom Probable Cause Recommended ActionCHANGEOVER ANDCONTROL TROUBLESProjector changeover command does notchange to sound output of the selecte

10-16You can hear pops and thumps duringprojector changeover.If your projector changeover relay power is DC, adiode should be soldered across the wind

APPENDIX AADVANCED OPERATIONSA.1 Customizing the Format Display ScreenThere are two types of Format Selection display screens. The unit is shipped in&

A-2Customizing the Format Display ScreenFORMATSMenuCancel OKExitTo assign formats to the softkeys pressthe Assign Formats key (SK1).OKA copy of the ex

A-3Customizing the Format Display ScreenFORMATSMenuCancel OKExitAssigning fader settings to the softkeysis done in a similar fashion.To assign fader s

A-4Customizing the Format Display ScreenFORMATSMenuCancel OKExitAssigning , or "linking", a projectorselection to the softkeys is done in as

A-5Customizing the Format Display ScreenFORMATSPress the FORMATS key to return tothe format selection screen.Notice that a small indicator (CUST)now a

1-31.4 SpecificationsConstructionRack-mount chassis frame construction with plug-in modules accessible behind hinged frontpanel.Signal Connectionsa.

A-6Saving System Settings1. Begin the data download function(send data to a computer) in theCP500 by pressing the keysequence:MENUSystem Setup (SK1)C

A-7Saving System Settings5. Go to the Settings drop-downmenu, and selectCommunications.6. Click on the various options asshown in this figure. This

A-8Saving System Settings13. On the CP500, rotate the frontpanel knob on the CP500 frontpanel to select Send Data +Text (for saving the CP500 dataplu

A-9Saving System Settings16. It is a good idea to check the integrity of the file which has just beendownloaded by immediately trying to load the fil

A-10Saving System Settings5. Press the OK key and the receive data pop-up box should appear. The system isnow waiting for data to be sent from the co

A-11Saving System SettingsA.2.2 Using Load500 SoftwareLoad500 is a specific DOS based program which has been developed to make thetask of transferring

A-12Saving System Settings4. On the computer run Load500.5. At the Load500 screen, select2. Download Parameters from CP500.Selection of menus in Loa

A-13Saving System Settings7. After choosing your option, the screen prompts you for a file name. (Any filename within the normal DOS constraints may

A-14Saving System Settings4. On the computer, run Load500.5. From the Load500 screen, select3. Upload Parameters to CP500.Selection of menus in Loa

A-15Transferring Data Between Two CP500sA.3 Transferring Data Between Two CP500sIt is possible to send CP500 system alignment and set-up parameters to

1-4Loudspeaker EqualizationL,C,R: 27 band digital 1/3 octave EQ; digitally controlled bass and trebleLsRs: digital 9-band, full octave EQSW: Digital p

A-16Transferring Data Between Two CP500s6. On the sending CP500, press the keysequence:MENUSystem Setup (SK1)CP500 Controls (SK1)CP500 ControlskeySyst

APPENDIX BCAT. NO. 683 ELECTRONIC CROSSOVERB.1 Description and FeaturesThe Cat. No. 683 Electronic Crossover Board is designed for use in the CP500Dig

B-2B.3 AlignmentB.3.1 Screen ChannelsJumpers J100, J200, and J300 allow the low frequency portion of the designatedchannels to be delayed by 1.9 ms or

B-3B.3.2 Surround Channel Bass DriversBoth the Cat. No. 682 Output card and the Cat. No. 683 have reversible filterheaders labeled 50/100 Hz for the s

B-4Bear in mind that when the unit first switches into Bypass mode, (when power isfirst applied, for example) the fader level in Bypass will be set to

B-5B.4.2 Crossover FrequencyThe values given in the table are for a 500 Hzcrossover frequency. The frequency can beset by scaling ALL resistors in the

B-6B.6 Jumpers and HeadersRN101RN201RN301horn is shown.Delay setting for largeHF BALANCEHF BALANCEHF BALANCELF BALANCESSRLRCLBYPASS LEVELDELAY SETTING

B-7Figure 3 - 1. Cat. No. 682.Crossover Select Jumpers [NO]J3 Left ChannelJ4 Center ChannelJ5 Right ChannelJ901 Bypass Audio ChannelThese jumpers rout

APPENDIX CBACKPLANE CONNECTORS / REFERENCE DIAGRAMSCP500 Backplane Connector Pin Assignments1. Automation Connector:PinNumberFunction1 SK1 Format Sel

C-24. Bypass / Remote Connector:PinNumberSignal Name1 Bypass Power Transformer Connection, 16-18 Vac2 Bypass Power Transformer Connection, 16-18 Vac3

1-51.5 Regulatory NoticesFCCThis equipment has been tested and found to comply with the limits for a Class A digital device,pursuant to Part 15 of the

C-37. Optical 1 Input Connector:PinNumberSignal Name1 Projector 1 Left Channel +2 Projector 1 Left Channel -3 Signal Ground4 Projector 1 Right Channe

C-410. Accessory Rack Analog Connector:PinNumberSignalNameSignal Description1 AccOptByp Mono input to Cat 682 for BypassOperation2 X15 Direct Input t

C-511. Accessory Rack Digital Connector:PinNumberSignalNameSignal Description1 SignalGroundSignal Ground2 OPTLRCK Left / Right Clock from Optical A/D

C-612. 6 Channel Input Connector* :PinNumberSignal Name Signal Description1 Signal Ground2 EXT3 Right Surround Channel External Input3 Signal Ground4

C-713. Reader 1 and Reader 2 Input Connector:PinNumberSignal Name Signal Description1N/C2N/C3N/C4 TTCO Row Clock Return5 TCOGND Row Clock Common6 FTC

APPENDIX DTHE DOLBY DIGITAL SUBSYSTEMBasic FunctionsThe basic functions of the Dolby Digital subsystem are:Video AcquisitionSync FindingThresholding a

D-2from each DSP, a threshold value is derived, above which a fixel is determined tobe clear, representing a digital “1”, and below which the fixel is

D-3Sample Rate ConversionThe sample rate of the data comming from the film is determined ultimately by theprojector speed. For correct operation of th

D-4FilmDolby Digital Decoder Block DiagramCCDScannerVideoAcquisitionBitExtractionErrorCorrectionFixedDelayFIFO andClock GenTransformDecoding6 ChannelS

APPENDIX ETHE EVOLUTION OF DOLBY FILM SOUNDThanks to such developments as multichannel sound, the motion picture viewingexperience today is more excit

1-6IMPORTANT SAFETY NOTICEThis unit complies with the safety standard IEC65. To ensure safe operation and to guardagainst potential shock hazard or ri

E-2to the older speakers. The result was to ignore the improved high-frequencyresponse of the newer, better units.To forestall compatibility problems,

E-3By the 1970s, however, the film industry declined overall, with fewer films andfewer theaters. The expense of magnetic release prints, their compar

E-4(made all but obsolete by the stereo optical format), consistently higher fidelity,and few of the drawbacks of magnetic formats.Much of the new tec

E-5As with previous Dolby developments, Dolby Digital does not obsolete existingtheater installations. The prints can be played conventionally in any

E-6While Dolby’s involvement with film sound first achieved wide recognition withthe spectacular audio effects of such films as Star Wars, it has long

SECTION 2EQUIPMENT REQUIREDThe following equipment is required for proper installation and alignment of theCP500 Digital Cinema Processor.• Dual-trace

2-2Figure 2 - 4. SMPTE Buzz Track.Figure 2 - 5. Stereo Optical Surround Level – Cat. No. 151B.Figure 2 - 6. Illumination Uniformity – Cat. No. 566.JIF

SECTION 3INSTALLATION AND JUMPERSDo NOT connect the CP500 to mains power until all connections have been madeand all jumpers have been checked or set.

3-23.2 Mount the CP500To avoid heat problems, do not mount the Dolby CP500 immediately above orbelow the power amplifiers. Locate the power amplifiers

Model CP500 Digital Cinema Sound Processor Installation and AlignmentIssue 5 Part No. 91371

3-33.3.1 Connect Motor Start Relays (Models CP500-D, and -70)For two-projector installations, motor start relays are required for projectorchangeover

3-43.3.3 Connection of Solar Cell BoardsIn contrast to traditional solar cells, the Cat. No. 655 and other solar cell circuitboards used by several p

3-5* Ground Wire on J2 Pin 2 is Optional* Ground Wire on J2 Pin 5 is RequiredJ2Chassis GroundJ1Cinema ProcessorFigure 3 - 2. Wiring using two 3-wire s

3-63.4 Check and Set JumpersNext, check the following jumpers located on each circuit card. The factory settingsfor each jumper are shown in [brackets

3-7Cat. No. 682 Analog Output CardFigure 3 - 6. Cat. No. 682.Crossover Select Jumpers [NO]J3 Left ChannelJ4 Center ChannelJ5 Right ChannelJ901 Bypass

3-8Cat. No. 683 Crossover Card (Optional)RN102RN202RN302RN600RN400horn is shown.Freq setting for large500 Hz500 Hz500 Hz500 Hz100 Hz50 HzSELECTORCROSS

3-9Low Frequency Time Delay Enable Jumpers [DELAY]J100 Left ChannelJ200 Center ChannelJ300 Right ChannelThese jumpers allow the low frequency portion

3-103.5 Install Circuit Cards - Card DescriptionsIf they are not already installed in the CP500 unit, install all of the cards for yoursystem as shown

3-11Contains Microprocessor.Controls front panel display and controls.Contains interface for remotes and automation equipment.Cat. No. 683 Crossover C

3-123.6 Bypass Power WiringFor emergency operation, the CP500 comes equipped with an independent externalmains power module. If the main power supply

Installation and Alignment ManualForModel CP500Digital Cinema Sound ProcessorDolby Laboratories IncorporatedU.S.A. 100 Potrero Avenue, San Francisco,

3-133.7 Power OnConnect the bypass power module to the CP500 and plug it into AC mains. Theunit is shipped with the POWER/BYPASS switch set to BYPASS.

3-143.7.1 Hum and Other Noise ProblemsIf you hear undesirable hum from the speakers when you apply power to the CP500and other projection room equipme

SECTION 4FRONT PANEL AND ALIGNMENT OVERVIEWThis section describes the CP500 LCD display and operation of the front panelcontrols, along with of an ove

4-2(SK1)(SK3)(SK4)(SK2)(SK5)(SK8)(SK6)(SK7)BYPASS INDICATORIndicates continuous red when unit is inbypass mode.MUTE ON INDICATORFlashes when mute is a

4-3CANCELMany of the screens used during set-up, alignment, or diagnostics contain a "Pop-Up" screen within the main screen. The CANCEL key

4-4A manual bypass push-button is located inside the front panel on the right hand sideof the unit.4.2 System PasswordMany of the CP500 alignment func

4-54.3 Aligning the B-ChainThe B-chain is defined as those system components from the fader through theloudspeakers. In the CP500, available adjustmen

4-6because there is no time for reverberation to build and add to the original sound.What is required is a curve that favors such impulsive “first arr

SECTION 5B-CHAIN ALIGNMENT5.1 Check Theater EquipmentThoroughly check the loudspeakers and power amplifiers for sources of poorperformance:• Check tha

5-2B-Chain Alignment•Blown fuses.•Good air movement through power amplifiers.Air-conditioningIf air-conditioning noise is audible in the theater, arra

TABLE OF CONTENTSSECTION 1 INTRODUCTION1.1 About the Dolby CP500 ...1-11.2 Hardwar

5-3B-Chain AlignmentBefore you set out to equalize the room, make sure you do the following:1. Be sure to use the same Bypass crossover frequency set

5-4B-Chain Alignment5.3 Room EqualizationEqualization is performed using a real-time analyzer built into the CP500. Theadjustment for the five full ra

5-5B-Chain AlignmentWARNING: The following steps will cause the CP500 to output pink noise to the poweramplifiers. The CP500 is shipped with the outpu

5-6B-Chain AlignmentEQ MIC INPUTRIGHT SIGNAL PRESENTLEFT SIGNAL PRESENTSIGNATURE MICEQ MICNONSYNC2 RIGHTNONSYNC2 LEFTNONSYNC1 RIGHTNONSYNC1 LEFTCAT. N

5-7B-Chain AlignmentOFF807060504030“85 dBC”EQ MIC INPUTSIGNAL PRESENTSIGNAL PRESENTSIGNATURE MICEQ MICNONSYNC2 RIGHTNONSYNC2 LEFTNONSYNC1 RIGHTNONSYNC

5-8B-Chain AlignmentEach of the channels should now beadjusted to give a reasonable soundpressure level in the room. It is notnecessary to get exact r

5-9B-Chain AlignmentThe system now displays a dialog boxallowing you to select the channel toequalize. OKRotate the front panel knob until thedesir

5-10B-Chain AlignmentSK4Adjust the Bass and Treble controls tomove the room levels close to thereference line. This is accomplished byrotating the fro

5-11B-Chain AlignmentFORMATSMenu Cancel OKExitSelect the next channel to adjust byagain pressing B-Chain Equalization(SK1).Repeat the above procedure

5-12B-Chain AlignmentEqualization facilities for the subwooferchannel are also different than for theother channels.The subwoofer equalizer is a digit

iiDolby Digital Soundtrack Processing System... 3-11Cat. No. 670 Video Front-end Card ...

5-13B-Chain AlignmentUsing the front panel knob and the"Up/down arrow" key:Set the SPL to 85 dB for the screenchannels.Set the SPL to 82 dB

5-14B-Chain AlignmentNoise is now routed to the subwoofer inoptical mode (0 dB, 50 Hz bandwidth).Use the front panel knob to set theaverage of the ban

5-15B-Chain Alignment5.4 Bypass Crossover AdjustmentNOTE: In a bi-amplified system, the bypass subsystem must have its own electronic crossover as we

5-16B-Chain AlignmentCAT. NO. 683BYPASS LEVELOFF807060504030“85 dBC”Adjust the Bypass Level trimpot on theCat. No. 683 for 85 dBC in the room.Position

SECTION 6A-CHAIN ALIGNMENTThe A-chain alignment involves adjustments made to the projector soundheadoptics, solar cell, and optical preamplifier card.

6-2Analog Optical Alignment - Projector6.2 Analog Optical Alignment - ProjectorIf a stereo solar cell is already installedon Projector No. 1, inspect

6-3Analog Optical Alignment - ProjectorInspect the lateral film guides forevidence of cuts, cracks, surface defects,and any foreign materials that cou

6-4Analog Optical Alignment - ProjectorPlace a white card at the front of thelens close to the position of the filmsound track. Adjust the position of

6-5Analog Optical Alignment - ProjectorFORMATSFORMATSMenu Cancel OKExitOn the CP500, press the FORMATSkey. The Current Format screen will bedisplayed.

6-6Analog Optical Alignment - ProjectorA-ChainAlignmentkeyAlignmentkeyFormatSelectionMenukeyFORMATSMenuCancel OKExitscreen shows:press:MenuSelectionSy

iiiSECTION 6 A-CHAIN ALIGNMENT6.1 Aligning the A-Chain ...6-16.2 An

6-7Analog Optical Alignment - ProjectorLLLLRRRR✓✓OSCILLOSCOPE TRACESThe lens and exciter lamp assemblyare adjusted laterally for a null if thefilm can

6-8Analog Optical Alignment - ProjectorLRDual SR/A Decoder ModuleDual SR/A Decoder ModuleAASRSRCat.No.222SR/ACat.No.222SR/A TEST POINTLEDLEDTEST

6-9Analog Optical Alignment - ProjectorFORMATSMenu Cancel OKExitPress Manual EQ (SK2). P1, Left OKSelect Projector 1, Left Channel byrotating the

6-10Analog Optical Alignment - ProjectorEXITThe RTA trace shown may not be typicalof your results. Merely attempt to obtainthe best response. The azim

6-11Analog Optical Alignment - ProjectorEXITPress EXIT.FORMATSMenu Cancel OKExitPress Manual EQ (SK2) and repeat thehigh frequency adjustment for the

6-12Analog Optical Alignment - ProjectorFORMATSMenu Cancel OKExitPress Auto Level (SK7) Projector 1 OKA pop-up screen appears which allowsyou to se

SECTION 7THE CP500 DIGITAL SYSTEM7.1 Mechanical AlignmentMechanical alignment of the Cat. No. 700 Digital Soundhead consists of makingsure the film pa

7-2Cat. No. 670 Video Board Test Points:VIDEO TP1 (white) The CCD video signalVGND TP2 (black) Ground reference for Video signalCLAMP TP3 (green) Hori

7-37.4 Exciter Lamp Level Confirmation and AdjustmentThe output voltage of the lamp power supply is factory-set to be between 9.5 and10 volts (See sco

7-4ADJUSTMENT SCREWLATERAL CLAMP SCREWTENSION ARMSPRINGFigure 7- 3. Locations of clamp screw and lateral adjustment screw.7.6 Optical AlignmentThe sou

iv8.4 Bypass Adjustments ...8-68.4.1 Before you Adjust ...

7-55. To re-align the CCD board, first loosen the two lateral adjustment screwsshown in the diagram of the circuit board. Move the board laterally whi

7-6Proper adjustment of position, intensity and focus will be verified by observing noerror light flashing and minimum error rate (1 to 8) displayed o

7-77.9 Cat. No. 673Error Rate DisplayFollowing powerup, with no film running, the seven-segment display on the Cat.No. 673 will display a “-” indicat

7-8digital system, the performance is perfect up to the limits of error correction, andthen degrades very rapidly. Should the digital data become corr

7-9To disable the auto-digital feature:MENU SK7You may disable auto-digital operationby pressing the MENU key and SK7.Pressing SK7 alternately e

7-10Allowable Source FormatsAny format can be designated as a source format. Non-film formats, however,should not be chosen as source formats. If, for

7-11Method 2Press Format 05 while playing digitaldata. A dialog box will appear on thescreen, asking if you want to disable theauto-digital format.OK

7-12Assigning Target FormatsSystem SetupkeyFormatSelectionMenukeyscreen shows:press:MenuSelectionscreen shows:press:FormatConfigurationkeySystemSetups

7-137.13 Maintenance and AdjustmentsThe Cat. No. 700 Digital Soundhead should be kept clean and free of dust and dirtfor best performance, just like t

7-147.13.2 Print CleanlinessAs with any soundtrack, keeping the film print clean will give best performance.The Dolby Digital print format has robust

vA.2 Saving System Settings...A-5A.2.1 Using the Terminal Program in W

SECTION 8FINAL ADJUSTMENTS8.1 Setting Optical Surround DelayThe CP500 incorporates a delay line in the surround channel to ensure that soundfrom the r

8-2OKRotate the front panel knob until thedesired delay reading is displayed.Then press the OK key.You can verify that the delay setting is acceptable

8-38.2 Setting Digital Soundhead DelayOn a Dolby Digital print, the digital sound data is located 6 frames in advance of theanalog soundtrack, and 26

8-48.2.2 Dynamic1. Thread a loop of Cat. No. 1010 Digital Soundhead alignment test film throughthe projector, analog soundhead, and digital soundhead.

8-58.3 Setting Digital Surround DelayThe CP500 automatically calculates a typical digital surround delay based on theoptical surround delay setting pe

8-68.4 Bypass AdjustmentsThe Bypass system has two adjustments: output level (all systems) and lowfrequency and high frequency driver balance (for sy

8-78.4.2 Bypass Level Adjustment(No Cat. No. 683 Electronic Crossover Card Installed)FMASMenu ancelitutput A ustkeyAllignmentkeyFormatSelectionMenukey

8-88.4.3 Output HF/LF Balance and Level Adjustments(With Cat. No. 683 Electronic Crossover Card)REMEMBER: Adjust the trimpot on the Cat. No. 682 Outp

8-9SK2Press Output Adjust (SK2).Select the Center channel. If necessary,calibrate the SPL level of the CP500analyzer.Select Half Screen.SK5Press Bypas

8-108.4.4 Bypass Level Adjustment for Early Cat. No. 682(No Cat. No. 683 Electronic Crossover Card Installed) Thread the projector, and run a loop

viAPPENDIX D THE DOLBY DIGITAL SUBSYSTEMD.1 Basic Functions ...

8-118.4.5 Early Cat. No. 682 Output HF/LF Balance and LevelAdjustments (With Cat. No. 683 Electronic Crossover Card)REMEMBER: Adjust the trimpot on t

8-128.5 About Non-syncThe CP500 has two sets of Non-sync inputs, designated Non-sync 1 and 2. Theyboth have a wide range of input level adjustment, bu

8-138.6 Mute Speed AdjustmentThe length of time it takes for the sound to fade from normal setting to muted(when the MUTE key is pressed) is adjustabl

SECTION 9ACCESSORIES9.1 CP500 Operation with Remote ControlsThe CP500 is equipped for use with three types of remote controls: Cat. No. 689,Cat. No. 7

9-2The format selection softkeys and MUTE key of the remote control box functionjust like those on the CP500 front panel, as long as the CP500 is in a

9-39.1.3 Auditorium FaderThis is a user-furnished 100k linear pot wired as a variable resistor, with minimumresistance corresponding to Fader 10.To se

9-49.2 Operation with Cat. No. 580 Microphone MultiplexerThe Cat. No. 580 Microphone Multiplexer has been designed to work with, as wellas be controll

9-5The figure shown below provides an example of good microphone placement.Figure 9 - 3. Microphone placement with Cat. No. 580 Multiplexer.Connect th

9-6To select one mic:SK1 - SK4To remove one mic:SK1 - SK4 ⇒⇒⇒⇒ SK5To resume scan:SK8Pressing any soft key, SK1 throughSK4, will halt scanning an

SECTION 10TROUBLESHOOTINGYour theater sound system consists of a number of critical audio components inaddition to the Dolby CP500. Thus, the first st