Dolby Laboratories CP650 Installation Manual
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Dolby Laboratories CP650 Installation Manual

Dolby Laboratories CP650 Installation Manual

Digital cinema sound processor
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Model CP650
Digital Cinema Sound
Processor

Installation Manual

Issue 4
Part No. 91569

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Summary of Contents for Dolby Laboratories CP650

  • Page 1: Installation Manual

    Model CP650 Digital Cinema Sound Processor Installation Manual Issue 4 Part No. 91569...
  • Page 2 Dolby and the double-D symbol are registered trademarks of Dolby Laboratories. Auditorium Assist, EQ Assist, and Surround EX are trademarks of Dolby Laboratories. All other trademarks remain the property of their respective owners. © 2002 Dolby Laboratories, Inc. All rights reserved.

  • Page 3: Table Of Contents

    List of Figures......................vii List of Tables ......................ix CP650 Operating System Software History ............x Chapter 1 Introduction About the Dolby CP650 Digital Cinema Processor .........1-1 Hardware Configurations Available............1-2 Accessories ....................1-3 Dolby Catalog Number Listing ..............1-3 Specifications ...................1-3 About Dolby Digital Surround EX............1-6 List of Formats Available .................1-8...
  • Page 4 Calibration Procedure (All CP650s) ...........4-4 Initial Output-Level Calibration ...............4-6 4.5.1 Main Channels ................4-6 4.5.2 Subwoofer Channel..............4-8 Crossover Setup (CP650 with Cat. No. 791)..........4-9 Room Equalization .................4-17 4.7.1 Crossover Level Adjustment (for CP650s with Cat. No. 791) .4-17 4.7.2 Setting Coarse (Bulk) EQ ............4-19 4.7.3...
  • Page 5 Remove the Housing..............8-2 8.2.2 Make a Hole for the Interface Cable...........8-2 8.2.3 Connect to the Circuit Board ............8-3 8.2.4 Set the Address Switch ...............8-4 8.2.5 Assemble the Unit...............8-4 8.2.6 Connect to the CP650 ..............8-5 Cat. No. 771 Remote Fader Installation ...........8-6...
  • Page 6 Wiring Diagram- Power Supply, Black Cover...........9-18 Wiring Diagram- Power Supply, Gold Cover ............9-18 Exploded Views- Digital Readers ..............9-19 Appendix A Software Operations Display Information About This CP650 Unit .........A-1 Updating CP650 Software ...............A-2 Transferring Settings Between Two CP650s ..........A-3 Appendix B Back Panel Connectors...

  • Page 7: List Of Figures

    Figure 3-4 Front-Panel Display Showing Dolby Digital Surround EX Film Playing....3-3 Figure 3-5 Front-Panel Display When Running Earlier Software ..........3-3 Figure 3–3 Fader Characteristic ....................3-4 Figure 3–4 CP650 Operation and Setup Menu Control Buttons ..........3-5 Figure 3–5 Setup Control Panel ....................3-6 Figure 3–6 Power Supply Voltage Test Points................3-8 Figure 4–1 EQ Microphone Placement ..................4-2...
  • Page 8 Figure 9–3 LED Assembly Wiring....................9-2 Figure 9–4 LED Assembly Initial Gap Setting ................9-2 Figure 9–5 Scope Display of CP650 Video Test Point Signal .............9-4 Figure 9–6 Adjust LED Assembly for Optimum Video Signal ...........9-4 Figure 9–7 LED Drive-Current Setting ..................9-4 Figure 9–8 Digital Soundhead Exciter Lamp Replacement ............9-5...
  • Page 9 ® Dolby Model CP650 Installation Manual List of Tables Table 1–1 Formats Supported by the CP650................1-8 Table 2–1 Solar Cell Preamp Board Connectors................2-6 Table 2–2 Examples of Available Balanced ↔ ↔ ↔ ↔ Unbalanced Adapters........2-11 Table 7–1 Surround Delays Based on Theatre Dimensions (in Feet) ..........7-4 Table 7–2 Surround Delays Based on Theatre Dimensions (in Meters) ........7-5...

  • Page 10: Cp650 Operating System Software History

    ® Dolby Model CP650 Installation Manual CP650 Operating System Software History V1.0.4.4 • First product shipments. • Covered in Installation Manual, Issue 1. V1.1.3.0 • ® Added support for Cat. No. 790 or 794 card: Dolby Digital Surround EX decoder and AES/EBU input for stereo pulse-code modulated (PCM) or Dolby Digital bitstreams from consumer products.
  • Page 11 ® Dolby Model CP650 Installation Manual V2.1.x.y (where x and y may be any numbers) • Added support for the Cat. No. 790 Dolby Digital Surround EX Decoder Card with four S/PDIF digital inputs. This card replaces the Cat. No. 794, adding three additional S/PDIF digital inputs.

  • Page 13: Chapter 1 Introduction

    , Dolby SR, Dolby A-type, and Academy mono film sound playback. The CP650 provides inputs for two projector soundheads (both analog and digital), an external six-channel processor, two nonsync sources, and a PA microphone. Its audio outputs are balanced, with a multipin connector configured to the THX standard. The CP650 is the first cinema processor to incorporate an Ethernet connection, enabling theatre personnel to monitor the unit’s functions remotely from a PC.

  • Page 14: Hardware Configurations Available

    Dolby Model CP650 Installation Manual Introduction download automatically into the CP650 the first time such a print is played in the cinema. The standard Model CP650 includes a Cat. No. 790 (Cat. No. 794 in earlier units) plug-in module featuring Dolby Digital Surround EX decoding, plus four-input AES/EBU digital inputs accommodating PCM audio and Dolby Digital (consumer) bitstreams.

  • Page 15: Accessories

    ® Dolby Model CP650 Installation Manual Introduction Accessories • Upgrade kit UD/650, which includes the Cat. No. 773 circuit board • Upgrade kit UEX/650, which includes the Cat. No. 790 circuit board • Upgrade kit Cat. No. 735 Auditorium Assist , which includes a microphone •...
  • Page 16 ® Dolby Model CP650 Installation Manual Introduction Microphone: Balanced input for Auditorium Assist microphone, PA mic, or B-chain alignment mic (or multiplexer), 15 V phantom power switchable via front-panel DIP switch; rear-panel XLR and front-panel 9-pin D-connector AES/EBU digital inputs: Accommodate stereo PCM audio at 48, 44.1, or 32 kHz, also accept Dolby Digital bitstreams;...
  • Page 17 ® Dolby Model CP650 Installation Manual Introduction Loudspeaker Equalization L, C, R, Ls, Rs, Bsl, Bsr: Digital 27-band, 1/3-octave, plus bass and treble control Le, Re (when equipped with optional Cat. No. 791): Digital 27-band, 1/3-octave, plus bass and treble control...

  • Page 18: About Dolby Digital Surround Ex

    Dolby Digital Surround EX is fully compatible with all current 5.1 digital sound formats and theatre systems. Prints that use it play normally with current systems, and provide the extra surround channel when played using a CP650 cinema processor equipped with a Cat. No. 790 or 794 board.

  • Page 19: Figure 1-1 Surround Speaker/Amplifier Switching For 5.1 And Surround Ex Modes

    ® Dolby Model CP650 Installation Manual Introduction Surround amplifiers Dolby CP650 Back surround left Back surround right Dolby Digital 5.1 mode Surround Dolby CP650 amplifiers Back surround left Back surround right Dolby Digital Surround EX mode Figure 1–1 Surround Speaker/Amplifier Switching for 5.1 and Surround EX Modes...

  • Page 20: List Of Formats Available

    ® Dolby Model CP650 Installation Manual Introduction List of Formats Available The formats supported by the CP650 are listed below. See Appendix D for complete definitions of each format. Table 1–1 Formats Supported by the CP650 Format Description Short Name...

  • Page 21: How To Identify Types Of Soundtracks

    ® Dolby Model CP650 Installation Manual Introduction How to Identify Types of Soundtracks Edge of film Dolby Digital soundtrack Analog soundtrack Picture area Figure 1–2 Photograph of Film Soundtracks A Dolby Digital, Dolby Digital Surround EX, stereo optical (Dolby A-type or SR), or mono optical print should be identified as such on both the film can and the leader.

  • Page 22: Regulatory Notices

    ® Dolby Model CP650 Installation Manual Introduction Regulatory Notices 1.9.1 This equipment has been tested and found to comply with the limits for a Class F digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
  • Page 23 ® Dolby Model CP650 Installation Manual Introduction 1.9.5 Notices for Europe This equipment complies with the EMC requirements of EN55103-1 and EN55103-2 when operated in an E2 environment in accordance with this manual. IMPORTANT SAFETY NOTICE This unit complies with the safety standard EN60065. The unit shall not be exposed to dripping or splashing and no objects filled with liquids, such as coffee cups, shall be placed on the equipment.

  • Page 25: Chapter 2 Installation

    CP650 is being aligned. Replacing an Existing Sound System If the CP650 replaces an existing cinema sound system, play a typical film before you remove the old system so you will have a benchmark for comparison to the new system.

  • Page 26: Disconnect The Old System

    Check Bypass Supply Mains Voltage Setting The bypass power supply mains voltage selector switch is accessible through a hole in the top cover of the CP650. Use a screwdriver to set the switch to either 120 or 220 VAC Figure2_8 shows the switch location.

  • Page 27: Mount The Cp650

    Locate the power amplifiers away from the CP650 to avoid hum pickup problems. Always leave a 1U space (43 mm, or 1.75 inches) above and below the CP650 to provide adequate ventilation. Install an air guide or baffle to deflect hot air from equipment below the CP650.

  • Page 28: Mount The Auditorium Assist Microphone

    Less than 1 VDC with respect to signal ground Motor Off: Greater than 3.5 VDC, less than 18 VDC If the CP650 is to be used in a platter operation (single projector), a jumper must be installed. A pre-wired connector is installed at the factory for this purpose.

  • Page 29: Remote Controls

    Minimum pot resistance corresponds to a front-panel fader setting of maximum (10). Details on how to connect any of these remote controls to the CP650 are shown in Chapter 8.1 and in the Installation Wiring Input and Control drawing located at the end of this chapter.

  • Page 30: Figure 2-3 Cell Preamp Wiring Using Two 3-Conductor Shielded (Screened) Cables

    There must be a connection between the ground pins at the Cat. No. 655 solar cell circuit board and the audio common in the CP650. This connection must not use the shield of the optical input cable, since doing so may impose RF energy on the CP650 ground system.

  • Page 31: Figure 2-5 Cell Preamp Wiring Using Two 2-Conductor Shielded (Screened) Cable

    ® Dolby Model CP650 Installation Manual Installation For Non-EU Countries Only: If it is necessary to use two- or four-conductor shielded cables, use the following wiring diagrams. – CP650 Out 1+ Optical In Belden 8451 or equivalent Out 1– –...

  • Page 32: Analog Nonsync Sources

    2.5.4 Analog Nonsync Sources The CP650 has two sets of analog nonsync inputs, designated nonsync 1 (Format 60), and nonsync 2 (Format 61). The input impedance is 11 kΩ. They both have a wide range of input level adjustment, but to further extend the possible range of input levels, the two sets of inputs have different gain adjustment ranges: •...

  • Page 33: Figure 2-7 Cat. No. 790 S/Pdif Connections

    In a CP650 equipped with a Cat. No. 790 board, the input type is S/PDIF. See Figure 2-7 for Option I/O connector hookup details. Refer to Table B-2 for signal definitions.
  • Page 34 ® Dolby Model CP650 Installation Manual Installation Professional Interface Standards for Digital Audio There are two professional interface formats used for digital audio: AES/EBU (also known as AES3) and AES3id. These stream the same digital data and professional audio header information over copper conductor links, but use different types of conductors and connectors.

  • Page 35: Table 2-2 Examples Of Available Balanced ↔ Unbalanced Adapters

    CP650. However, if you intend to connect sources across different types of digital audio inputs, Do not attempt to convert a digital interface type by, for example, directly wiring an XLR connector to a BNC or RCA plug.

  • Page 36: Exploded View And Board Locations

    110 VAC: T 200 mA L 220 VAC: T 100 mA L Power / Bypass Button Front Panel Mounting Screw Figure 2–8 Model CP650 Exploded View Disassembly steps can be found in the troubleshooting section of this manual. (See Section 9.3.2.) 2-12...
  • Page 37 75 pF per meter. For two conductor with shield wiring, use Belden 8451 All shields must be connected to the CHASSIS of the CP650. 2-conductor shielded cable or equivalent: tinned copper, This achieves the required RF interference immunity. A metal...
  • Page 38 Subwoofer Notes: Follow all local electrical and building codes. All shields must be connected to the CHASSIS of the CP650. This achieves the required RF interference immunity. A metal Use grounded (earthed) conduit wherever possible. Avoid housing must be used for all D-connectors and the shields routing signal wiring near electric motors, rectifiers, power must be connected to the housing.
  • Page 39 250V time-lag fuse. FUSE T 6.3A L This Class A digital apparatus complies with Canadian ICES003. 5 mm x 20 mm FB425J04.CDR CP650 with Cat.No.790 / 791 Screen Speakers L (low) Signal black black...
  • Page 40 250V time-lag fuse. interference that may cause undesired operation. FUSE T 6.3A L This Class A digital apparatus complies with Canadian ICES003. 5 mm x 20 mm FB425K04.CDR CP650 with Cat.No.790 / 791 Screen Speakers L (low) Signal black black...

  • Page 43: Chapter 3 Front Panel And Alignment Overview

    Dolby cinema equipment. It is useful to develop an understanding of why the CP650 is aligned as described in this manual. If the installer is already familiar with the CP650 and these principles, or is in a hurry to complete the installation, this chapter may be read later.

  • Page 44: Figure 3-2 Front-Panel Display Showing All Possible Channels Active

    Day-to-day operation of the CP650 is performed through interaction with this display. The 20-character, four-line LCD provides a read-out of processor condition and operation mode. It can be used by the service engineer to align the CP650 if PC setup software is not used.

  • Page 45: Figure 3-3 Front-Panel Display Showing A Dolby Digital Film Playing

    Ls SW Figure 3-3 Front-Panel Display Showing a Dolby Digital Film Playing Figure 3-3 shows the display when the CP650 is playing a Dolby Digital soundtrack with no Dolby Digital Surround EX decoder board installed. Since there are no Le, Re, Bsr or Bsl channels present in this configuration, no signal bars are indicated for those channels.

  • Page 46: Figure 3-3 Fader Characteristic

    ® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview Level Display The main fader level is displayed as a two-digit number. Starting from a display of the level increases from –90 to –10 dB (display 4.0) as the fader knob is turned clockwise.

  • Page 47: Figure 3-4 Cp650 Operation And Setup Menu Control Buttons

    Front-Panel and Alignment Overview Power Supply Button This button operates the main power supply for the CP650. As with other Dolby cinema processors, the CP650 utilizes a separate backup (bypass) power supply. A red LED built into the switch is activated when the unit is powered from the bypass supply.

  • Page 48: The Setup Control Panel

    Note: For convenience, pressing the illuminated format button once, or any other format button twice, causes the CP650 to immediately return to the menu top-level screen display. This feature is handy for making a quick change, then returning to normal operation.
  • Page 49 These two potentiometers, located on the Cat. No. 772A card, set the CP650 output level when the unit switches to bypass operation. The HF control is used if the CP650 is equipped with a Cat. No. 791 Crossover Card. Earlier units used the Cat.

  • Page 50: Power Supply Voltage Test Points

    A multi-microphone setup with multiplexer is placed in the auditorium to receive the pink noise reproduced by the loudspeaker. The output of the selected microphone is fed to a real-time analyzer (RTA) circuit built into the CP650 (or to your separate...
  • Page 51 ® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview RTA if you prefer.) Equalization can be performed by using an oscilloscope connected to the RTA output test points or by using a PC running Dolby setup software. Either display will represent the spectrum received by the microphones. The effect of adjustments to the equalizers is quickly and easily seen.
  • Page 52 ® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview The final factor is masking of the screen. The masking curtains must be drawn back sufficiently to clear the left and right screen speakers before any adjustments or measurements are made. The high-frequency horns should clear the screen frame and be mounted as close as possible to the screen.

  • Page 53: B-Chain Alignment

    This is especially true if the system uses active crossovers with bi-amp equipment. If your CP650 is equipped with a Cat. No. 791 Crossover Board, please refer to Section 4.4 for information on settings.

  • Page 54: Microphone Placement

    45 degrees upward towards the screen. Route the output cable to the CP650 and connect it to the microphone connector on the rear panel or front setup panel (XLR on the rear panel or nine-pin D-connector “MIC MUX”...

  • Page 55: Initial Setup

    Caution: The following steps will cause the CP650 to output pink noise to the power amplifiers. The CP650 output levels may be set too high. If you are unsure of the settings on your unit, turn off the power amplifiers before selecting the “Calibrate SPL” menu item shown in Section 4.4 below. Then, select and observe the present output level adjustment settings.

  • Page 56: Spl (Sound Pressure Level) Calibration

    B-Chain Alignment SPL (Sound Pressure Level) Calibration If your CP650 is equipped with a Cat. No. 791 Crossover Board, an initial setup is required before you begin the SPL calibration. If you do not have a Cat. No. 791 installed, skip to Section 4.4.2.
  • Page 57 Please Wait... Calibrating..Note: The calibration is retained in CP650 memory and can be used in future alignments. However, it is advisable to recalibrate the system when re-arranging microphones because the sound pressure level will vary slightly with microphone placement.

  • Page 58: Initial Output-Level Calibration

    Note: If pink noise is not being generated, this indicates that the status of the digital input has changed. If you are using the digital input on the CP650, either disconnect or power down the device attached the digital input during calibration. A change in the digital input bitstream will cause the CP650 to mute the pink noise.
  • Page 59 ® Dolby Model CP650 Installation Manual B-Chain Alignment Output Levels Press the center menu button once to move the > > > > Channel: Center cursor back up to the Channel: selection. Level: xx Room Level xx.x dB Adjust Output Level Rotate the main fader knob counterclockwise to >...

  • Page 60: Subwoofer Channel

    ® Dolby Model CP650 Installation Manual B-Chain Alignment 4.5.2 Subwoofer Channel The initial subwoofer level adjustment uses a displayed RTA reference line, established from the center channel pink-noise level. The subwoofer level is adjusted to match the displayed reference line. Final subwoofer level adjustments for both digital and optical signal paths are carried out later, after the room is equalized.

  • Page 61: Crossover Setup (Cp650 With Cat. No. 791)

    B-Chain Alignment Crossover Setup (CP650 with Cat. No. 791) If your CP650 is not equipped with a Cat. No. 791 Crossover Board, please skip this section. Two jumpers, located on the Cat. No. 772A board, must be set to “yes” when a Cat.
  • Page 62 ® Dolby Model CP650 Installation Manual B-Chain Alignment The following parameters must be set before adjusting the room equalization in your auditorium: • Crossover Mode (2-Way or 3-Way) • Left Extra (Le) and Right Extra (Re) screen channel support (available only in 2-Way and Full Range crossover modes) •...
  • Page 63 ® Dolby Model CP650 Installation Manual B-Chain Alignment Selecting Butterworth Filter Type The crossover filters designed into the Cat. No. 791 are adjustable to allow tailoring of the response to your particular system. For most applications, the crossover filter type should be set to Linkwitz-Riley. The slopes in this filter are not adjustable. The filter has two cascaded two-pole Butterworth filters for the lowpass side, and a 3-pole filter for the high-pass side at the crossover point.
  • Page 64 ® Dolby Model CP650 Installation Manual B-Chain Alignment menu If you configured the crossover mode as Crossover Config: Channel: Left 2-Way, there is one crossover point for Param : F Type Low setting the filter type. Press the center menu >Value : Butterwth.
  • Page 65 ® Dolby Model CP650 Installation Manual B-Chain Alignment Setting Corner Frequency menu Press the center menu button to move the arrow to the Parameter selection. Crossover Config: Rotate the front-panel knob to select the Channel: Left lowpass filter corner frequency parameter >Param...
  • Page 66 ® Dolby Model CP650 Installation Manual B-Chain Alignment Setting Butterworth Filter Slope menu Crossover Config: If you selected Butterworth for the Channel: Left >Param >Param : Slope Lo : Slope Lo >Param >Param : Slope Lo : Slope Lo crossover filter type, press the center menu...
  • Page 67 ® Dolby Model CP650 Installation Manual B-Chain Alignment Setting Delay The delay settings must be adjusted to compensate for different physical mounting positions of the speaker drivers. menu Crossover Config: Press the center menu button twice to move Channel: Left the arrow to the Parameter selection.
  • Page 68 ® Dolby Model CP650 Installation Manual B-Chain Alignment Next Channel menu After all parameters have been set for this channel, press the center menu button to move the arrow to the channel selection, and rotate the front-panel knob to select the next screen channel to be adjusted.

  • Page 69: Room Equalization

    “Q,” and level of “cut,” using a single- band parametric equalizer circuit. If your CP650 is equipped with an optional Cat. No. 791 Crossover Board, there are additional steps to perform before setting room equalization. See Section 4.7.1 below.
  • Page 70 ® Dolby Model CP650 Installation Manual B-Chain Alignment menu Press the middle menu button to move the arrow to the Level selection. While observing the RTA display on the oscilloscope, rotate the front-panel knob Crossover Levels until the high-frequency bands are at the Channel: Left Hi >Level: 70...

  • Page 71: Setting Coarse (Bulk) Eq

    ® Dolby Model CP650 Installation Manual B-Chain Alignment 4.7.2 Setting Coarse (Bulk) EQ menu Press Left menu button. The Bulk EQ menu appears with Center channel > > > > Bulk EQ Ch.: Center Center Center Center Bass Adjust:±x.x dB selected.

  • Page 72: Setting Fine Eq (1/3 Octave)

    ® Dolby Model CP650 Installation Manual B-Chain Alignment Press the center menu button to move cursor down to Treble Adjust: Bulk EQ Ch.: Center Bass Adjust:±x.x dB >Treble Adj Treble Adj: ±x.x dB Treble Adj Treble Adj Corner Freq: x kHz...
  • Page 73 A small marker on the scope trace shows the frequency band selected. Turn the front-panel knob (with no button pressed) to select the active band. The CP650 screen cursor (line) blinks to indicate which band is active. When the front-panel knob is rotated to select frequencies at the far left (or right) side of the LCD screen, the displayed bands will “scroll”...

  • Page 74: The Eq Assist Feature

    ® Dolby Model CP650 Installation Manual B-Chain Alignment When the desired response for this channel has Saving Changes..been achieved, press the right-hand OK button to save the settings. Press the left menu button once, then move the front-panel knob to select the next channel to be L, R, and Ls, Rs equalized.

  • Page 75: Setting Subwoofer Channel Eq

    ® Dolby Model CP650 Installation Manual B-Chain Alignment 4.7.5 Setting Subwoofer Channel EQ menu Press the left menu button twice to move to the Subwoofer EQ screen. Equalization facilities for the subwoofer channel Subwoofer EQ Subwoofer EQ Subwoofer EQ Subwoofer EQ are different than for the other channels.
  • Page 76 ® Dolby Model CP650 Installation Manual B-Chain Alignment menu Press the center menu button to move the cursor to Frequency:, then rotate the front-panel knob. A dip in the frequency response will move along Frequency the frequency axis of the scope RTA display.

  • Page 77: Final Output-Level Calibration

    ® Dolby Model CP650 Installation Manual B-Chain Alignment 4.7.6 Final Output-Level Calibration Now that room equalization is complete, the sound pressure level in the theatre can be set accurately. Main Channels If a microphone multiplexer is being used, select MIC 1.
  • Page 78 Note: If pink noise is not being generated, this indicates that the status of the digital input has changed. If you are using the digital input on the CP650, either disconnect or power down the device attached the digital input during level setting. A change in the digital input bitstream will cause the CP650 to mute the pink noise during level setting.
  • Page 79 ® Dolby Model CP650 Installation Manual B-Chain Alignment Subwoofer Speaker Polarity Check Using the center menu button, move the cursor to Optical Subwoofer Level: xx Center Noise, then rotate the front-panel knob Polarity: Normal to On. >Center Noise: On Press the center menu button to move the cursor...

  • Page 80: Final Sound Check: Rotating Pink Noise

    Final Sound Check: Rotating Pink Noise 1 2 3 4 5 6 8 Slide DIP switch 6 down to the normal position. The CP650 will switch to normal operation with the user’s menu choices available. menu Press the left menu button multiple times to move the display to the Rotating Pink Noise screen.

  • Page 81: A-Chain Alignment

    The A-chain optical level is calibrated with the Cat. No. 69T Dolby Tone test film. This film is used to establish the correct Dolby operating level within the CP650. A Cat. No. 69P pink-noise test film is used for A-chain frequency response and soundhead alignment.

  • Page 82: Reverse-Scan Checkup: Projector

    ® Dolby Model CP650 Installation Manual A-Chain Alignment Reverse-Scan Checkup: Projector Clean the optical surfaces with a cotton swab moistened with glass cleaner. Inspect the film guides for evidence of cuts, cracks, surface defects, or any foreign materials that could impair smooth film guiding.
  • Page 83 Confirm that the cell wiring and connections are correct. Shielded cables must be used. The inner conductors must be wired to the CP650 OPTICAL input connectors exactly as shown on the wiring diagram foldout. Note: The solar cell associated with the right channel is...

  • Page 84: Dolby Level Set

    Cat. No. 69T on projector 1. The film emulsion should face away from the screen. Verify that the signal presence LEDs on the CP650 setup panel are illuminated. The Dolby tone signal should be visible on the oscilloscope. Proj 1...
  • Page 85 ® Dolby Model CP650 Installation Manual A-Chain Alignment Press the OK button to begin manual adjustment. The number displayed on the bottom line Manual L O O R represents the level setting for Left channel. Level The four vertical circles display the Left XX O O channel signal level, similar to an LED meter.

  • Page 86: Film-Path Alignment Check

    ® Dolby Model CP650 Installation Manual A-Chain Alignment Press the OK button to save the level settings for Projector 2, Left and Right channels. Saving Changes..Film-Path Alignment Check Connect the oscilloscope to the Lt and Rt test 1 2 3...

  • Page 87: Cell Alignment Check

    ® Dolby Model CP650 Installation Manual A-Chain Alignment The adjustment is correct when there is no signal output while the film is running. It may not be possible to adjust for a null with some older slits; in such instances, adjust for a minimum and equal signal on L and R.

  • Page 88: Cell Wiring Check

    ® Dolby Model CP650 Installation Manual A-Chain Alignment Cell Wiring Check Verify that the outputs of the right and left solar cells are properly connected by placing a white card over the right sound track (nearer the outside of the projector) and verifying that...

  • Page 89: Focus Check

    PRESENT Video Clamp RTA1 RTA2 Mic Bypass Ch 1 Ch 2 Oscilloscope Press the CP650 left menu button to move to menu Optical Focus the Optical Focus adjust menu. >Projector: P1 Channel: Left The scope RTA will display the frequency Press OK when ready.

  • Page 90: Optical Hf Equalization (Slit-Loss Eq)

    5.10 Optical HF Equalization (Slit-Loss EQ) This step adjusts the high-frequency response of the optical preamplifier circuit. The CP650 provides both automatic and manual facilities for optical, or slit-loss, high- frequency equalization. The Auto menu appears first: Auto Slit-Loss EQ Continue to play the Cat.
  • Page 91 ® Dolby Model CP650 Installation Manual A-Chain Alignment Rotate the front-panel knob for the most extended high-frequency response without “peaking.” Note: If this procedure does not improve the response, the problem may be a degraded slit or lens damage. menu...

  • Page 93: Digital Soundheads

    ® Dolby Model CP650 Installation Manual Chapter 6 Digital Soundheads Mechanical Alignment Mechanical alignment of the Cat. No. 701 (or 700) Digital Soundhead consists of confirming that the film path through the digital soundhead is aligned with the path through the projector. For built-in reverse-scan (basement) digital soundheads, see the manufacturer's instructions.

  • Page 94: Adjustment With Oscilloscope

    The following test setup will enable adjustment of focus and confirmation or adjustment of light level and optical alignment. 1. Make sure power to the digital soundhead is provided. Power to the CP650 should also be on. 2. Open the CP650 front-panel setup access door.

  • Page 95: Led Brightness Confirmation And Adjustment

    ® Dolby Model CP650 Installation Manual Digital Soundheads Figure 6–2 Digital Video Oscilloscope Image—Focus Adjustment LED Brightness Confirmation and Adjustment The optimum peak video signal voltage (unobstructed light through the perf hole) is 4 V, measured from the 0 V reference baseline to the upper trace. If necessary, adjust the Cat.

  • Page 97: Final Adjustments

    Press the left menu to move the Bypass Level Adjust menu (or press and hold while rotating the front-panel knob). Bypass Level Adjust Press the OK button, switching the CP650 to Press OK to bypass operation. The main power button will enter bypass.

  • Page 98: Setting Optical Surround Delay

    20 milliseconds after the arrival of sound from the front speakers. The delay is adjustable from 20 to 150 ms, in 1 ms steps. The setting is stored to CP650 memory using the procedure outlined below. Use the following formula to calculate the correct delay setting: 1.

  • Page 99: Setting Digital Surround Delay

    Setting Digital Surround Delay The CP650 automatically calculates a typical digital surround delay based on the optical surround delay setting performed in the previous section. Actual theatre geometry affects the amount of surround delay required; you may, therefore, wish to...

  • Page 100: Table 7-1 Surround Delays Based On Theatre Dimensions (In Feet)

    ® Dolby Model CP650 Installation Manual Final Adjustments menu Press the left menu button to move to the Digital Surround Delay menu. Digital Surround Delay > xxx mSec Rotate the front-panel knob to show the desired delay then push the OK button.

  • Page 101: Setting Dolby Digital Reader Delay

    In the CP650, this delay is set by entering the number of film perforations, within the range from 12 perfs (approximately 160 ms delay) to 512 perfs (approximately 5 seconds).

  • Page 102: Table 7-3 Typical Delay Settings For Dolby Digital Readers

    Proj 1 menu Press the left menu button to move to the Dolby Digital Reader Delay menu. Both optical and digital audio are present while the CP650 is set to this menu item. Dolby Digital Reader Delay > xxx Perforations The audio contains equal digital and optical sound simultaneously.

  • Page 103: Nonsync Level Adjustment

    ® Dolby Model CP650 Installation Manual Final Adjustments Nonsync Level Adjustment Press the left menu button to move to the Nonsync 1 Level (or Nonsync 2 Level) menu. Nonsync Level Play a CD or cassette, etc, on the nonsync device >...

  • Page 104: Mono Level Trim And Eq Adjustment

    < + > Note: With the “+” symbol located at the far-right position (HF setting) of the display, the CP650 applies the “Academy” filter. Press the OK menu button to save the desired EQ setting.

  • Page 105: Assigning Preset Fader Levels

    Assigning Preset Fader Levels menu Press the left menu button to move to the Preset Fader Levels menu. Preset levels can be assigned to each CP650 format button. Preset Fader Levels >Format xx Fader: xx.x Rotate the front-panel knob to select the format button you wish to preset.

  • Page 106: Assigning User Button Formats

    ® Dolby Model CP650 Installation Manual Final Adjustments Assigning User Button Formats Any available format can be assigned to the U1, U2, or NS buttons (“User 1”, “User 2”, “Nonsync”). Then, when the button is pressed, that format will be selected.

  • Page 107: Assigning Ns Button Format

    Auto-Mute causes the CP650 outputs to mute automatically if a Dolby Digital bitstream input is not present. When a PCM input bitstream is detected, the CP650 outputs will mute. Use this option with caution.

  • Page 108: 7.11 Reversion Mode

    Model CP650 Installation Manual Final Adjustments 7.11 Reversion Mode Caution: Be aware that leaving the CP650 set to No Reversion mode prevents automatic switching to analog optical sound if there is a loss or failure of the Dolby Digital soundtrack.

  • Page 109: 7.13 Noise Gating

    ® Dolby Model CP650 Installation Manual Final Adjustments 7.13 Noise Gating This menu item is for special applications. It can be used with specialized test equipment to make RT-60 measurements. See Table B-11 in Appendix B for signal connection details.

  • Page 110: 7.14 Running Auditorium Assist

    EQ settings or sound equipment have been made. The initial measurements should be performed after the CP650 theatre installation is complete: with seats, carpet, screen, and room treatment all installed. Auditorium conditions should include the following: •...

  • Page 111: Establish Reference Measurements

    Press OK to cancel through all channels. The channel being measured is displayed. Note: The CP650 outputs pink noise at 85dBC for the L, C, and R channels; 82dBC for each of the surround channels; and +10 dBr for the subwoofer.

  • Page 112: Auditorium Sound Check

    Press OK to cancel through all channels. The channel being measured is displayed. Note: The CP650 outputs pink noise at 85dBC for the L, C, and R channels; 82dBC for each of the surround channels; and +10dBr for the subwoofer.

  • Page 113: Fail" Parameters

    This test is designed to measure the room noise, and to determine if it has changed significantly. The CP650 mutes, and a comparison is made between the noise received by the microphone and the stored reference reading. If this comparison fails, the following message is inserted into the event log: “Aud Noise xx dBr”...

  • Page 114: 7.15 Noise Floor Optimization

    ® Dolby Model CP650 Installation Manual Final Adjustments 7.15 Noise Floor Optimization The Noise Floor Optimization feature provides improved dynamic range in certain specialized installations. It works by adjusting for any unused headroom in the B-chain EQ, lowering the noise floor by that amount.

  • Page 115: 7.16 Clock Set

    7.16 Clock Set The clock is used only to “time-stamp” event log messages to aid in troubleshooting. The CP650 will operate perfectly without setting the clock. Press the left menu button, or press and hold the button while rotating the front-panel knob to move to the Clock Set menu.

  • Page 116: 7.17 Date Set

    1 2 3 4 5 6 8 Slide DIP switch 6 to the normal (down) position. The CP650 will switch to normal operation with the user's menu choices available. Press the left menu button multiple times to move to the Mute Fade-in Time screen.

  • Page 117: Chapter 8 Accessories

    The combined length of connecting cable to all the remote units should not exceed 100 m (300 ft). • When you connect one or more remote units to the CP650, all units are live and communicate with each other. Any fader level adjustment changes the display on all of the connected units.

  • Page 118: Cat. No. 779 Remote Control Installation

    Use a two-conductor shielded cable (Belden 8451 or equivalent) to connect the remote to the CP650. To prevent wear on the cable from the metal edge of the hole you create, use a rubber or neoprene grommet on the cable. The diameter of the hole you make should be the same as the diameter of the cable grommet or conduit bushing.

  • Page 119: Connect To The Circuit Board

    Dolby Model CP650 Installation Manual Accessories The wire to the CP650 must run from the connection point on the circuit board without touching any circuit-board components. • If the remote control will be mounted in a console or on a wall, we recommend placing the hole in the bottom of the housing.

  • Page 120: Set The Address Switch

    Dolby Model CP650 Installation Manual Accessories 8.2.4 Set the Address Switch For the CP650 to communicate with all the remote units, each unit must be set to a unique address number using switch SW1. Interface connector SWITCH SIDE VIEW switch...

  • Page 121: Connect To The Cp650

    Note: All remote units attach to the same terminals on the connector. Do not connect wires from any Dolby remote unit to terminal 4, 5, or 6. 2. Plug the connector into the Remotes and Aud Fader input on the CP650 rear panel.

  • Page 122: Cat. No. 771 Remote Fader Installation

    3. Use a two-conductor shielded cable (Belden 8451 or equivalent) to connect the remote to the CP650. To prevent wear on the cable from the metal edge of the hole you create, use a rubber or neoprene grommet on the cable. The diameter of the hole you make should be the same as the diameter of the cable grommet or conduit bushing.

  • Page 123: Maintenance And Troubleshooting

    At this point, wear may exceed the error correction capabilities of the Dolby Digital decoder, and the CP650 will automatically switch to the analog Dolby SR track.

  • Page 124: Figure 9-2 Led Assembly Mounting Screws

    ® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting 9.2.1 Replacing the Cat. No. 701 Digital Soundhead LED Assembly In normal operation, the LED assembly used in the Cat. No. 701 Digital Soundhead will exhibit gradually reduced light output over its life. If it becomes necessary to replace the LED, follow the procedure outlined below.
  • Page 125 Set horizontal sweep rate to 2 µs/div. e. Set the trigger source to Channel 2 and positive polarity. f. Turn on power to the digital soundhead and the CP650. 2. Set the oscilloscope display. a. Thread and play a Cat. No. 69T Dolby tone test film loop.

  • Page 126: Figure 9-5 Scope Display Of Cp650 Video Test Point Signal

    Clamp (Trigger) Trace (CH2) SET HORIZONTAL SWEEP Figure 9–5 Scope Display of CP650 Video Test Point Signal 3. Adjust the LED Position. a. Switch the Channel 1 video input coupling back to DC. Figure 9–6 Adjust LED Assembly for Optimum Video Signal b.

  • Page 127: Figure 9-8 Digital Soundhead Exciter Lamp Replacement

    ® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting 9.2.2 Replacing the Cat. No. 700 Digital Soundhead Exciter Lamp To replace the exciter lamp, carefully remove the six screws holding the rear cover/power supply of the digital soundhead. Allow the lamp to cool if necessary.

  • Page 128: Cp650 Troubleshooting

    ® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting CP650 Troubleshooting 9.3.1 Power Supply Voltage Ranges Six test points are located on the front subpanel for measuring power supply voltages. They can be accessed by removing the front panel. --15V...

  • Page 129: Exploded View And Board Locations

    Figure 9–10 Model CP650 Exploded View Caution: Many components used on the circuit boards are sensitive to electrostatic damage. It is essential to wear an earthing strap while handling or changing CP650 circuit boards. To gain access to the CP650 circuit boards: 1.

  • Page 130: The Event Log

    9.3.3 The Event Log The event log stores entries on the operation of the CP650. It can be useful in troubleshooting or tracking subtle system failures. Also, Auditorium Assist "fail" parameters are stored in the event log. (See Section 7.14.4.) Normally, a single log entry occurs every time the CP650 powers on.

  • Page 145: Appendix A Software Operations

    Note: You can also press and hold the left menu button while rotating the front-panel fader knob clockwise to step through the menu items. About This CP650 is made up of three menu About this CP650: screens. Pressing the left menu button cycles the System v.a.b.c.d...

  • Page 146: Updating Cp650 Software

    Model CP650 Installation Manual Software Operations Updating CP650 Software 1. Connect the PC to the CP650 Cinema processor using a serial cable connected to the CP650 serial data connector on the front setup panel (or on the rear panel). SERIAL DATA...

  • Page 147: Transferring Settings Between Two Cp650S

    7. Save the retrieved settings to disk. The file name should end with the “.dby” extension. 8. Unplug the serial cable from the source CP650 and plug it into the destination CP650. Note: If you have closed the CP650 Setup program or opened another settings parameter file (.dby), then before continuing, you must select “Open”...

  • Page 149: Appendix B Back Panel Connectors

    Appendix B Back Panel Connectors B.1 Output Connectors Main Audio Output Connector The main audio outputs of the CP650 are sourced from balanced output circuits. The ® connector type and pin configuration conform to the THX standard. With a ®...

  • Page 150: Table B-2 Option Card I/O Connector Pinout With Cat. Nos. 790, 791, Or 794 Installed

    The pinout of this connector is determined by the type of option board installed in the connectors of the Cat. No. 774A system controller board. In a standard CP650, the Cat. No. 790 Dolby Digital Surround EX Decoder/Digital Input Board is shipped in this location (Cat. No. 794 on earlier units). Output signals for the surround channels appear on this connector.

  • Page 151: Table B-3 Option Card I/O Connector Pinout With Cat. No. 778 Installed

    Dolby Digital Surround EX audio format. With this card installed, all output channel level trims default to 127 to allow for the proper gain structure. The analog outputs of the CP650 are muted when a Cat. No. 778 card is installed. All audio outputs are digital.

  • Page 152: Table B-4 Dolby Digital Reader Input Connector Pinout

    Dolby Digital Reader Connectors (Reader 1 and 2) These connectors are used for connecting up to two Dolby Digital film soundtrack readers to the CP650 or CP650D. These connections are inactive on model CP650SR. The pinout and the signals on these connectors are identical to the Dolby’s DA20 Digital Film Sound Processor and CP500D Digital Cinema Processor.

  • Page 153: Table B-5 Motor-Start Connector Pinout

    The motor-start connector is used to interconnect the changeover control lines of the CP650 with the theatre control system. If the CP650 is to be used in a platter operation (single projector), a jumper must be installed on this connector between pins 1 and 5.

  • Page 154: Table B-8 Mic Mux Connector

    An EQ microphone or mic multiplexer can be connected at this location without the need for access to the CP650 rear panel. Pins 1, 2, and 5 are wired in parallel with the rear-panel microphone input XLR connector. If you wish to use a connector already wired for use with a Dolby CP500, add a jumper between pins 5 and 6.

  • Page 155: Table B-10 Six-Channel Analog Input Connector Pinout

    6-Channel Analog Audio Input Connector This input is an unbalanced analog audio input. The nominal reference level is approximately 300mV. There are no input level trim controls within the CP650 for this input. Table B–10 Six-Channel Analog Input Connector Pinout...

  • Page 156: Table B-11 Automation I/O Connector Pinout

    ® Dolby Model CP650 Installation Manual Back Panel Connectors B.3 I/O Connectors Automation I/O Connector This connector is a 25-pin female D-connector, wired to closely match the configuration of the Dolby Model CP65. Table B–11 Automation I/O Connector Pinout Connection Specification S0 (automation select) format 01—Mono...

  • Page 157: Table B-12 Automation I/O Connector Pins Used For Noise Gating

    This connector “mirrors” the RS-232 connector located on the front setup panel. A PC can be connected at either location for performing complete cinema processor alignment using Dolby CP650 setup software. Caution: Only one of the two RS-232 connectors can be used at any given time.

  • Page 159: Appendix C Optical Surround Level Trim

    Surround Delay. Optical Surround Note: If the optical surround delay has been set during a previous Delay CP650 system setup, write down the current delay setting > xxx mSec displayed! Rotate the front-panel knob counterclockwise to set the delay to 20 ms. Then press the OK button “20 mSec”...
  • Page 160 +1.2 dB. Press the OK button to save the change. Saving Changes... If a previous CP650 setup has been performed, restore the original optical surround delay menu setting noted in the step above.

  • Page 161: Appendix D Format Descriptions

    Dolby Model CP650 Installation Manual Appendix D Format Descriptions Each format supported by the CP650 is described below. More specifically, each ® listing describes the audio processing applied by each format for any Dolby cinema processor. Table D–1 describes the parameters for each format.

  • Page 162: Format Definitions

    Model CP650 Installation Manual Format Definitions Format Definitions The formats supported by the CP650 are described below. If a format name is too long for display on the CP650 front-panel (limited to 19 characters), a second, short name is given.
  • Page 163 The audio for the screen channels and subwoofer is output via the CP650’s main audio outputs, and the audio for the four surround channels is output via the “Option card I/O” D-connector. Note that reversions occur...
  • Page 164 Four channels of A-type noise reduction are applied to the L, C, R, and S tracks (tracks 1, 3, 5, and 6). The CP650 generates the outputs L, C, R, Ls, Rs, and SW. The Ls and Rs outputs are copies of the “S” mono surround input track. The subwoofer track is created by lowpass filtering the Le and Re tracks at 180 Hz and summing them.
  • Page 165 ® Dolby Model CP650 Installation Manual Format Definitions Format 64 Public Address Center Channel Short name: Public Address, C Audio Description: A single channel is input through the microphone input connector. The audio output is sent to Center only. Format 65...
  • Page 166 80/81 PCM Options” screen. This screen also contains a “PCM Auto Mute” option that causes the CP650 to mute automatically if it does not detect a Dolby Digital bitstream. This prevents noise when working only with encoded bitstream audio. For Dolby Digital bitstreams, the metadata contained in the bitstream specifies the channel format and surround processing to be applied.
  • Page 167 Left Extra and Right Extra. These are input on S/PDIF input 4 and output on the Left and Right mid-frequency analog outputs. In order to use this format, the CP650 must be configured for 2-Way crossover operation, and Le/Re mode must be enabled.
  • Page 168 Bsl and Bsr channels), and Rs. The out-of-phase information is discarded. The audio for the screen channels and subwoofer is output via the CP650’s main audio outputs, and the audio for the four surround channels is output via the Option card I/O connector.
  • Page 169 ® Dolby Model CP650 Installation Manual Format Definitions Format 89 (Cat. No. 778 required) 6-Channel PCM + Surround EX Short name: 6-Channel PCM + EX Audio Description: This format is identical to Format 88 with the exception that Surround EX decoding is applied to Ls and Rs producing additional Bsl/Bsr (identical) outputs.

  • Page 173: Appendix E External Control Of Cp650

    (“\r\n”). This is the typical “end of line” combination sent by PC terminal programs. Current CP650 settings may be queried by substituting a question mark “?” for the “<value>” field. The complete set of known settings may be queried by using the...
  • Page 174 Dolby Model CP650 Installation Manual External Control of CP650 Commands Range of Values Notes format_button 0 .. 7 inticates which button on the CP650 front-panel should be applied: Data Button Applied Format 01 Format 04 Format 05 Format 10 Format 11...
  • Page 175 No Parity, No Flow Control) and cannot be invoked while the SERIAL DATA port is in use by the CP650 Setup or Reader Alignment programs. 2. The interface operates in RAW serial mode. Characters are not echoed back to the controller, and control characters are ignored.

  • Page 176: Control Via Remotes Connector

    While this was never intended to be a feature of the remote port, it may be possible to command the CP650 to change the fader level, select any one of the eight front-panel formats, and to toggle the mute status.
  • Page 177 The CP650 supports remote accessory device addresses 1 through 9. The CP650 has intentionally added one nonstandard modification to the DDCMP protocol. If the CP650 sends out the hex value “FF” twenty times in a row, all remote accessories should recycle themselves to their power-on state. This includes resetting themselves to the ISTRT state, and attempting to re-establish the link.
  • Page 178 CP650. The value will be between 1 and 8, corresponding to the front-panel buttons as described above. The next most significant bit tells whether the CP650 is muted (0 = not muted, 1 = muted). The next most significant bit tells which projector is in use (0 = projector 1, 1 = projector 2).

  • Page 179: Appendix F Setup And User Menus

    ® Dolby Model CP650 Installation Manual Appendix F Setup and User Menus 1 2 3 4 5 6 8 CP650 Setup Menu DIP switch 6 UP The Bsl and Bsr channels (shown in italics) are available only with Cat. No. 790 installed.
  • Page 180 ® Dolby Model CP650 Installation Manual Setup and User Menus CP650 Setup Menu, B-Chain (continued): menu menu Notes EQ center frequency: 25–125 Hz Subwoofer EQ Adjust EQ filter width (“Q”): 0.5, 1, 2, 4 Level Cut: 0 to –12 dB...
  • Page 181 Select Format to assign User Format 2 Select to the U2 button. Select Format to assign Nonsync Format Select to the NS button. Mutes CP650 if not detecting Format 80/81Options Auto Mute: Disabled/Enabled Dolby Digital input bitstreams. PCM Options Decode:...

  • Page 182: Cp650 User Menu

    DIP switch 6 DOWN The options shown in bold are the default settings when the unit was shipped from the factory. menu menu Notes This is the top-level Format and CP650 Status Display menu display. Fader Setting Local/Auditorium Local/Auditorium Format:...
  • Page 183 ® Dolby Model CP650 Installation Manual Setup and User Menus CP650 User Menu, Continued menu menu Notes Contrast Adjustment Set the display contrast. Scroll up and down the Event Log event listing. Useful for telephone About this CP650—Screen 1 •...

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