Model CP650 Digital Cinema Sound Processor Installation Manual Issue 4 Part No.
® Dolby Model CP650 Installation Manual Dolby Laboratories, Inc. Corporate Headquarters Dolby Laboratories, Inc. 100 Potrero Avenue San Francisco, CA 94103-4813 Telephone 415-558-0200 Fax 415-863-1373 www.dolby.com European Headquarters Dolby Laboratories, Inc. Wootton Bassett Wiltshire, SN4 8QJ, England Telephone (44) 1793-842100 Fax (44) 1793-842101 Dolby and the double-D symbol are registered trademarks of Dolby Laboratories.
® Dolby Model CP650 Installation Manual Table of Contents List of Figures........................................................................................................vii List of Tables ..........................................................................................................ix CP650 Operating System Software History ............................................................x Chapter 1 Introduction 1.1 About the Dolby CP650 Digital Cinema Processor ............................
® Dolby Model CP650 Installation Manual Chapter 4 B-Chain Alignment 4.1 Check Theatre Equipment ........................................................................4-1 4.2 Microphone Placement .............................................................................4-2 4.3 Initial Setup ..............................................................................................4-3 4.4 SPL (Sound Pressure Level) Calibration..................................................4-4 4.4.
® Dolby Model CP650 Installation Manual Chapter 7 Final Adjustments 7.1 Setting Bypass Level ................................................................................7-1 7.2 Setting Optical Surround Delay................................................................7-2 7.3 Setting Digital Surround Delay ................................................................7-3 7.4 Setting Dolby Digital Reader Delay.........................................................7-5 7.
® Dolby Model CP650 Installation Manual Chapter 9 Maintenance and Troubleshooting 9.1 Print Cleanliness .......................................................................................9-1 9.2 Digital Soundhead Maintenance...............................................................9-1 9.2.1 Replacing the Cat. No. 701 LED Assembly ...............................9-2 9.2.2 Replacing the Cat. No. 700 Exciter Lamp ..................................9-5 9.3 CP650 Troubleshooting........................
® Dolby Model CP650 Installation Manual List of Figures Figure 1–1 Surround Speaker/Amplifier Switching for 5.1 and Surround EX Modes ................1-7 Figure 1–2 Photograph of Film Soundtracks................................................................................1-9 Figure 1–3 Film Soundtrack Identification ..................................................................................1-9 Figure 2–1 Main Fuse Assembly..........................................................................
® Dolby Model CP650 Installation Manual Figure 9–1 Digital/Analog Track Wear........................................................................................9-1 Figure 9–2 LED Assembly Mounting Screws..............................................................................9-2 Figure 9–3 LED Assembly Wiring...............................................................................................9-2 Figure 9–4 LED Assembly Initial Gap Setting ................................................
® 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) ........................................
® 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 EXTM decoder and AES/EBU input for stereo pulse-code modulated (PCM) or Dolby Digital bitstreams from consumer products. • Covered in Installation Manual Addendum, Part No. 91743. V1.1.5.0 • Added support for Cat. No. 779 remote control unit and Cat. No.
® 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. • Added support for the Cat. No. 791 Digital Crossover Card. This card plugs into the Cat. No. 790, providing two- and three-way screen channel crossover capability along with support for Left Extra/Right Extra screen channels.
® Dolby Model CP650 Installation Manual Chapter 1 Introduction 1.1 About the Dolby CP650 Digital Cinema Processor The Dolby CP650 Digital Cinema Processor is a self-contained, all-digital cinema processor capable of supporting Dolby® Digital, Dolby Digital Surround EXTM, 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.
® 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. Options available for the CP650 include a remote fader (Cat. No. 771), a remote unit (Cat. No.
® Dolby Model CP650 Installation Manual 1.3 Accessories • • • • • • • 1.4 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 AssistTM, which includes a microphone Cat. No. 771 Remote Fader Cat. No. 778 Digital I/O Board, which provides up to eight channels of digital I/O Cat. No. 779 Remote Control Unit Upgrade Kit Cat. No.
® 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; input via 25-pin D-connector with optional adapter boards (Cat. Nos. 790 or 778) 110Ω ±20%, balanced (equipped with Cat.
® 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 SW: Digital parametric with 12 dB cut capability Distortion Typically 0.
® Dolby Model CP650 Installation Manual 1.6 Introduction About Dolby Digital Surround EX Dolby Digital Surround EX adds a third surround channel to digital film sound, a concept first envisioned by sound designers at Lucasfilm’s Skywalker Sound postproduction facility. It gives sound mixers a new level of creative freedom. Dolby Digital Surround EX is fully compatible with all current 5.1 digital sound formats and theatre systems.
® Dolby Model CP650 Installation Manual un d Ls Bsl su r ro Surround amplifiers Le ft Dolby CP650 Bsr Ls Rs d un ro ur ts gh Ri 10 Introduction Back surround left Back surround right Back surround left Back surround right Rs Ls Bsl Bsr Rs Dolby Digital 5.1 mode Bsr Ls Bs Rs un d Bsl Ls Bsl Bsr Rs su ft Ls rro Surround amplifiers Le Dolby CP650 d un ro ur ts gh Ri U1 Rs Dolby Digital Surround EX mode Figure 1–1 Surround Speaker/Amplifier Switching for 5.
® Dolby Model CP650 Installation Manual 1.7 Introduction List of Formats Available The formats supported by the CP650 are listed below. See Appendix D for complete definitions of each format.
® a Dolby Model CP650 Installation Manual 1.8 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. However, with handling, the identification may be lost.
® Dolby Model CP650 Installation Manual 1.9 Regulatory Notices 1.9.1 FCC Introduction 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.
® Dolby Model CP650 Installation Manual 1.9.5 Introduction 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.
® Dolby Model CP650 Installation Manual Chapter 2 Installation Do not connect the CP650 to mains power until all other connections have been made. If air-conditioning noise is audible in the theatre, arrange for lubrication of the motor and fan bearings, adjustment of belts and drives, and cleaning of filters to reduce the ambient noise to a minimum. If the air-conditioning cannot be repaired, switch it off while the CP650 is being aligned. 2.
® Dolby Model CP650 Installation Manual 2.1.3 Installation Disconnect the Old System • Disconnect power from the existing cinema sound equipment. • Disconnect all cabling from the existing sound processor. Leave the cables connected to the power amplifiers, booth monitor, etc. 2.2 Check Fuse and Bypass Mains Voltage Selector WARNING: Check that the correct main fuse has been installed. To reduce the risk of fire, replace only with fuses of the same type and rating.
® Dolby Model CP650 Installation Manual Installation Bypass Power Supply Fuse The bypass power supply fuse is accessible by removing the plastic front-panel and the front subpanel. It is located above the power/bypass switch. The fuse values are: For 110 VAC Mains T 200 mA L (time-lag, 200 mA, 20 mm, low breaking capacity, 250 V) For 220 VAC Mains T 100 mA L (time-lag, 100 mA, 20 mm, low breaking capacity, 250 V) Caution: Early CP650s used a 315 mA fuse for all mains voltages.
® Dolby Model CP650 Installation Manual 2.4 Installation Mount the Auditorium Assist Microphone Auditorium AssistTM operation requires the use of the Cat. No. 735 microphone. Mount the microphone permanently in the auditorium, at a convenient location away from sound sources. If the rear wall is used, the microphone should be centered between surround speakers. Wall plates with an integrated XLR connector are available.
® Dolby Model CP650 Installation Manual 2.5.2 Installation Remote Controls Three types of remote controls can be used with the CP650. A maximum of three remote units (in any combination) can be used. The Cat. No. 779 CP650 Remote Control Unit duplicates the front-panel format selection, fader, and mute functions of the CP650. The Cat. No. 771 Remote Fader Unit duplicates the front-panel main fader knob and level display of the CP650.
® Dolby Model CP650 Installation Manual Installation Table 2–1 Solar Cell Preamp Board Connectors J2 Pin Number 1 2 3 4 5 6 J1 Pin Number 7 8 9 Signal Right (or Left) + Signal Ground Right (or Left) – Left (or Right) + Signal Ground Left (or Right) – Power from CP650 +15 V –15 V Signal Ground 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.
® 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. J2 1 – 3 Gnd CP650 Optical In Out 1+ + Out 1– Belden 8451 or equivalent 1 9 2* Gnd – 4 2 8 3 7 Out 2+ 4 + 6 6 Gnd Shield 5* Cat.No.
® Dolby Model CP650 Installation Manual 2.5.4 Installation 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: • The nonsync 1 input will accommodate input levels between approximately 0.2 and 4 V.
® Dolby Model CP650 Installation Manual Installation Connecting to the Digital Audio Input The external electrical connections to the optional boards in the CP650 are available on the 25-pin D-connector marked “Option I/O” on the rear panel of the CP650. Since the boards have different functionality, each pin on this connector changes its function depending on which optional card is installed. Refer to Table B-2 for the signal definitions.
® 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.
® Dolby Model CP650 Installation Manual Installation Multiple Sources: Conversion Between Interface Standards Although some details of the bitstreams used in the AES and S/PDIF standards are different, the audio information is exactly the same. As a consequence, most audio equipment will accept either standard with no need to convert the bitstream itself; this is the case with the CP650.
® Dolby Model CP650 Installation Manual 2.6 Installation Exploded View and Board Locations Cat. No. 790 Dolby Digital Surround EX Decoder / Digital Aux. Input Card Cat. No. 791 Digital Crossover Card (for use with Cat. No. 790 only) Cat. No. 773 Dolby Digital Decoder Bypass Mains Voltage Selector Switch (110/220 VAC) - or Cat. No. 778 Dolby Digital Surround EX Decoder / Digital I/O Card Cat. No. 774A System Controller Cat. No.
® Dolby Model CP650 Installation Manual Projector 1 Cat. No. 701 Digital Reader 2-Projector Changeover Single Projector AUDITORIUM ASSIST Microphone Projector 1 OR +15V 100 mA MAX All shields must be connected to the metal shield of the D-connector. 7 13 25 2 1 S/PDIF Digital Output Source 21 1 Proj 1 Motor Start Relay SHIELD GROUND MUTE U2 NONSYNC U1 11 10 05 04 01 AUD.
® Dolby Model CP650 Installation Manual C UL Installation O AUTOMATION US LISTED CP650 Digital Cinema Processor Wootton Bassett U.K. San Francisco U.S. PROFESSIONAL AUDIO EQUIPMENT 4J06 MUTE U2 NONSYNC U1 11 10 13 1 SERIAL DATA (RS-232) ETHERNET READER 1 01 04 05 MOTOR START REMOTES AND AUD.
® Dolby Model CP650 Installation Manual C UL Installation O AUTOMATION US LISTED CP650 Digital Cinema Processor Wootton Bassett U.K. San Francisco U.S. PROFESSIONAL AUDIO EQUIPMENT 4J06 MUTE U2 NONSYNC U1 11 10 13 1 SERIAL DATA (RS-232) ETHERNET READER 1 01 04 05 MOTOR START REMOTES AND AUD.
® Dolby Model CP650 Installation Manual C UL Installation O AUTOMATION US LISTED CP650 Digital Cinema Processor Wootton Bassett U.K. San Francisco U.S. PROFESSIONAL AUDIO EQUIPMENT 4J06 MUTE U2 NONSYNC U1 11 10 13 1 SERIAL DATA (RS-232) ETHERNET READER 1 01 04 05 MOTOR START REMOTES AND AUD.
Dolby Digital Front end Option Card Digital Card Option Cat.No. 773 6 Input Multiplexer Optical Preamp with EEPOTS Analog Card 2 2 FB425F01.
® Dolby Model CP650 Installation Manual Chapter 3 Front Panel and Alignment Overview This chapter describes the features on the CP650 front panel, along with an overview of the general principles involved in the alignment of 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.
® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview Front-Panel Display L Le C Re R Rs Bsr Bsl Ls SW 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.
® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview Other Possible Front-Panel Sound Format Displays L C R Rs 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.
® 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 0.0, the level increases from –90 to –10 dB (display 4.0) as the fader knob is turned clockwise. The level then increases in smaller steps from –10 to +10 dB (display 10). As with previous generations of Dolby cinema processors, a fader setting of 7.0 (0 dB) is the nominal correct operating level.
® Dolby Model CP650 Installation Manual 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. While the main power supply is in use, this button is not illuminated, and the screen and other indicators operate normally.
® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview immediately, but will not be saved until this button is pressed. Leaving the current menu before pressing the button will cause the change to be discarded. 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.
® Dolby Model CP650 Installation Manual Front-Panel and Alignment Overview Mic Input Level Control This ten-turn potentiometer has an end-to-end range of 46 dB. It is shipped from the factory set to minimum. Bypass Output Level Controls 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. No.
® Dolby Model CP650 Installation Manual 3.3 Front-Panel and Alignment Overview Power Supply Voltage Test Points Six test points are located behind the front-panel for measuring power supply voltages. They can be accessed by removing the front panel. See Section 9.3.1 for the voltage test ranges.
® 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. The Auditorium AssistTM feature, available in system software version 2.
® 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. Conventional black felt side-masking can severely restrict high-frequency response.
® Dolby Model CP650 Installation Manual Chapter 4 B-Chain Alignment 4.1 Check Theatre Equipment Thoroughly check the loudspeakers and power amplifiers for any sources of poor performance, using the suggested checklists below as a guide. Speakers • Loudspeaker cables—Check that they are in good condition and that they are the correct gauge for the impedance of the speakers and the length of the run. • Speaker wiring—Check that the speakers are connected to the correct power amp channel.
® Dolby Model CP650 Installation Manual B-Chain Alignment • Ensure that there is good air movement through power amplifiers. Air-Conditioning If air-conditioning noise is audible in the theatre, arrange for lubrication of the motor and fan bearings, adjustment of belts and drives, and cleaning of filters to reduce the ambient noise to a minimum. 4.2 Microphone Placement Position a microphone multiplexer in the center of the listening area.
® Dolby Model CP650 Installation Manual 4.3 B-Chain Alignment Initial Setup Set all the gain controls on all power amplifiers to a known, repeatable setting. The preferred setting for most amplifier gain controls is maximum. POWER AMPS Off If a different setting is required in order to optimize the noise performance of the system, the controls should be locked in position or marked clearly. Caution: The following steps will cause the CP650 to output pink noise to the power amplifiers.
® Dolby Model CP650 Installation Manual 4.4 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. 4.4.1 Initial Setup (CP650s with Cat. No. 791 Crossover) SPL calibration of CP650s equipped with a Cat. No. 791 Crossover Board is performed with the crossover set to “Full Range” mode.
® Dolby Model CP650 Installation Manual 40 70 50 60 80 The scope should now be receiving sync signals from the CP650. Set the scope vertical inputs to 100 mV/div. Set the horizontal sweep rate to 1 ms/div. Temporarily switch the inputs to GND and move the vertical position of each trace to line up with the bottom screen graticule line. Do not move the vertical positions after completing this step. Switch the inputs to DC and adjust the sync to trigger on the waveform.
® Dolby Model CP650 Installation Manual 4.5 B-Chain Alignment Initial Output-Level Calibration Each of the channels should now be adjusted to give a reasonable sound pressure level in the room. It is not necessary to get exact readings at this point because the levels will change slightly during equalization of the room. Exact output level adjustment will be performed after equalization. Note: If pink noise is not being generated, this indicates that the status of the digital input has changed.
® Dolby Model CP650 Installation Manual B-Chain Alignment Output Levels >Channel: Center Level: xx Room Level xx.x dB Press the center menu button once to move the cursor back up to the Channel: selection. Adjust Output Level >Channel: Left Level: xx Room Level xx.x dB Rotate the main fader knob counterclockwise to change the Channel selection to Channel: Left. menu OK Adjust Output Level Channel: Left >Level: xx Room Level 85.
® Dolby Model CP650 Installation Manual 4.5.2 B-Chain Alignment 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. menu OK Switch the microphone multiplexer to cycle.
® Dolby Model CP650 Installation Manual 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. No. 791 Crossover Card is installed. CP650s shipped with a Cat. No. 791 board have the correct jumper setting. See Section 9.3.2 for instructions on gaining access to the jumpers. NO YES J2 C DOLBY LABORATORIES INC. MADE IN THE U.S.A. Jumpers Cat. No.
® 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) • • • • • Filter type used at each crossover point (Linkwitz-Riley or Butterworth) Filter corner frequency at each crossover point Filter slope (Butterworth filter type only) Delay Polarity inversion
® 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.
® Dolby Model CP650 Installation Manual B-Chain Alignment menu OK Crossover Config: Channel: Left Param : F Type Low >Value : Butterwth. If you configured the crossover mode as 2-Way, there is one crossover point for setting the filter type. Press the center menu button to move the arrow to Value.
® 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. OK Crossover Config: Channel: Left >Param : Freq Lo Value : 400 menu OK Crossover Config: Channel: Left Param : Freq Lo >Value : 400 Rotate the front-panel knob to select the lowpass filter corner frequency parameter (Freq Lo). Press the center menu button to move the arrow to the Value selection.
® Dolby Model CP650 Installation Manual B-Chain Alignment Setting Butterworth Filter Slope menu OK Crossover Config: Channel: Left >Param : Slope Lo Value : 18 If you selected Butterworth for the crossover filter type, press the center menu button twice to move the arrow to the Parameter selection. Rotate the front-panel knob to select the low- frequency slope (Slope Lo). Press the center menu button to move the arrow to the Value selection.
® 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 OK Crossover Config: Channel: Left >Param : Delay Lo Value : 0.0 mSec Press the center menu button twice to move the arrow to the Parameter selection. Rotate the front-panel knob to select the low-frequency output delay (Delay Lo). menu OK Crossover Config: Channel: Left Param : Delay Lo >Value : 0.
® Dolby Model CP650 Installation Manual B-Chain Alignment Next Channel menu OK Crossover Config: >Channel: Center Param : F Type Low Value : Lkwz.-Rly. OK Saving Changes..... ... 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. This example shows the center channel selected.
® Dolby Model CP650 Installation Manual 4.7 B-Chain Alignment Room Equalization Room equalization is performed using the real-time analyzer (RTA) circuit built into the CP650 along with an oscilloscope for RTA display. The adjustments for all output channels involves two steps: coarse, or “bulk,” adjustment using bass and treble controls, and fine adjustment, using a 27-band equalizer.
® Dolby Model CP650 Installation Manual B-Chain Alignment menu Press the middle menu button to move the arrow to the Level selection. OK Crossover Levels Channel: Left Hi >Level: 70 HF≈ ≈LF menu While observing the RTA display on the oscilloscope, rotate the front-panel knob until the high-frequency bands are at the same approximate level as the lowfrequency bands. If you configured the crossover mode as 3-Way, press the center menu button to move the arrow to the channel selection.
® Dolby Model CP650 Installation Manual 4.7.2 B-Chain Alignment Setting Coarse (Bulk) EQ menu OK >Bulk EQ Ch.: Center Bass Adjust:±x.x dB Treble Adj: ±x.x dB Corner Freq: x kHz Press Left menu button. The Bulk EQ menu appears with Center channel selected. Pink noise will appear at the center channel speaker. The standard response curve should appear over the average of the displayed mid-frequency peaks. If this is not the case, the scope setup step may have been performed incorrectly.
® 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 Treble Adj: Adj ±x.x dB Corner Freq: x kHz Slowly move the front-panel knob to adjust the high-frequency response as close as possible to the reference line displayed on the RTA. 1, 2, 4 kHz L, R, and Ls, Rs or L, R, Ls, Bsl, Bsr, Rs If a satisfactory response is not obtained, try changing the corner frequency.
® Dolby Model CP650 Installation Manual 1.0kHz C ±x.x dB -_ _---_ --_- -__--_-- = + = = Flat B-Chain Alignment The 27-band RTA now displays on the oscilloscope. 1 kHz is the default start frequency band selected. 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.
® Dolby Model CP650 Installation Manual OK Saving Changes..... ... L, R, and Ls, Rs or L, R, Ls, Bsl, Bsr, Rs 4.7.4 B-Chain Alignment When the desired response for this channel has 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 equalized. Repeat the above procedure for the remaining full-range channels.
® Dolby Model CP650 Installation Manual 4.7.5 B-Chain Alignment Setting Subwoofer Channel EQ menu OK Subwoofer EQ >Frequency: xx Hz Q: x.x Cut: - xx.x dB Press the left menu button twice to move to the Subwoofer EQ screen. Equalization facilities for the subwoofer channel are different than for the other channels. This process is designed to correct the principal room resonance in the operating range of the subwoofer.
® Dolby Model CP650 Installation Manual B-Chain Alignment menu OK Frequency 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 the frequency axis of the scope RTA display. Adjust the frequency until the center of the dip is in the same band as the peak displayed in the previous unequalized frequency response.
® Dolby Model CP650 Installation Manual 4.7.6 B-Chain Alignment 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. MIC 1 menu OK Output Levels >Channel: Center Level: xx Room Level xx.x dB Press the left menu button to display the Output Levels screen. Repeat the output level setting steps given in Section 4.5.
® Dolby Model CP650 Installation Manual B-Chain Alignment 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.
® Dolby Model CP650 Installation Manual B-Chain Alignment Subwoofer Speaker Polarity Check Optical Subwoofer Level: xx Polarity: Normal >Center Noise: On Polarity: Normal / Inverse 20–80 Hz Using the center menu button, move the cursor to Center Noise, then rotate the front-panel knob to On. Press the center menu button to move the cursor to Polarity: Use the front-panel knob to switch between Normal and Inverse polarity.
® Dolby Model CP650 Installation Manual 4.8 B-Chain Alignment Final Sound Check: Rotating Pink Noise 12345678 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. OK CAUTION Pressing OK will play pink noise in the auditorium OK Press the right OK button to start the pink noise.
® Dolby Model CP650 Installation Manual Chapter 5 A-Chain Alignment 5.1 Overview The A-chain alignment involves adjustments made to the projector soundhead optics, solar cell, and optical preamplifier board. It is the part of the sound system that covers the film path, analog soundtrack solar cell, optical preamplifier, slit-loss equalizer, digital soundtrack reader, associated digital signal processing and decoding circuitry, and Dolby® processing circuits.
® Dolby Model CP650 Installation Manual 5.2 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. 5.3 Analog Optical Alignment: Projector If a stereo solar cell is already installed on Projector No. 1, inspect the surface of the cell for cracks, chipping, or other damage.
® Dolby Model CP650 Installation Manual A-Chain Alignment Remove the existing exciter lamp and replace with a new lamp. Adjust the exciter lamp DC voltage to between 70 and 85 percent of the rated voltage. Using an AC millivolt meter or oscilloscope, verify that there is no more than 3 percent ripple present with the lamp on. LAMP VOLTAGE DC ADJUSTMENT 6V 4–5 Volts 9V 6.
® Dolby Model CP650 Installation Manual 5.4 A-Chain Alignment Dolby Level Set 12345678 Lt Rt Video Clamp RTA1 RTA2 Connect the oscilloscope to the Lt and Rt test points. SIGNAL PRESENT Lt Rt Mic Bypass 12345678 Slide DIP switch 6 to the up position. This switches the CP650 into setup mode. Ch 1 Ch 2 GND Oscilloscope Automatic Optical Level Adjust Projector 1 Press OK When Ready. Press the left menu button multiple times to move the display to Automatic Optical Level Adjust Projector 1.
® Dolby Model CP650 Installation Manual A-Chain Alignment Press the OK button to begin manual adjustment. OK Manual Level P1 The number displayed on the bottom line represents the level setting for Left channel. The four vertical circles display the Left channel signal level, similar to an LED meter. L O O R O O O O XX O O Rotate the front-panel knob until the two center circles fill black. Press the center menu button to select the Right channel.
® Dolby Model CP650 Installation Manual A-Chain Alignment OK Press the OK button to save the level settings for Projector 2, Left and Right channels. Saving Changes..... ... 5.5 Film-Path Alignment Check 12345678 Lt Rt Video Clamp RTA1 RTA2 Connect the oscilloscope to the Lt and Rt test points. SIGNAL PRESENT Lt Rt Mic Bypass Ch 1 Ch 2 GND Oscilloscope Thread and play a SMPTE Buzz Track test film. This film has modulation just beyond the normally scanned areas of the optical sound tracks.
® Dolby Model CP650 Installation Manual ✓ A-Chain Alignment ✓ L L R R L L R R 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. Some projectors use a lens with an adjustable slit width. The adjustment is correct at the point when the left and right signals both disappear equally. OSCILLOSCOPE TRACES 5.
® Dolby Model CP650 Installation Manual 5.7 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 the level of the Right channel drops, as indicated by the Rt Signal Present LED on the CP650 setup panel. If the film path, optics, or LED / exciter lamp were adjusted, repeat the previous filmpath alignment and cell alignment steps.
® Dolby Model CP650 Installation Manual 5.9 A-Chain Alignment Focus Check 12345678 Lt Rt Reconnect the scope to RTA1 and RTA2 test points. SIGNAL PRESENT Video Clamp RTA1 RTA2 Lt Rt Mic Bypass Ch 1 Ch 2 GND Oscilloscope menu OK Optical Focus >Projector: P1 Channel: Left Press OK when ready. Press the CP650 left menu button to move to the Optical Focus adjust menu. The scope RTA will display the frequency response of the Left channel optical preamp output for projector 1.
® Dolby Model CP650 Installation Manual A-Chain Alignment 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, highfrequency equalization. The Auto menu appears first: Auto Slit-Loss EQ Continue to play the Cat. No. 69 P pink-noise test film. Projector 1: Move the CP650 menu display to Auto SlitLoss EQ for Projector 1.
® Dolby Model CP650 Installation Manual A-Chain Alignment 9 Rotate the front-panel knob for the most extended high-frequency response without “peaking.” X Note: If this procedure does not improve the response, the problem may be a degraded slit or lens damage. X menu OK When the desired response has been achieved, press the right menu OK button to save the settings. After saving the settings the display returns the Manual Slit-Loss EQ Projector 1 menu. Saving Changes..... ...
® Dolby Model CP650 Installation Manual Chapter 6 Digital Soundheads 6.1 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. 1.
® Dolby Model CP650 Installation Manual 6.2 Digital Soundheads Adjustment with Oscilloscope Note: The Cat. No. 701 Digital Soundhead is optically aligned at the factory and should not require adjustment unless the CCD Circuit Board has been disturbed. 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.
® Dolby Model CP650 Installation Manual Digital Soundheads Figure 6–2 Digital Video Oscilloscope Image—Focus Adjustment 6.4 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. No. 701 power supply output to achieve the correct video voltage. See Figure 6-3 for adjustment location (VR1).
® Dolby Model CP650 Installation Manual Chapter 7 Final Adjustments 7.1 Setting Bypass Level With a Cat. No. 791 Crossover Card installed, two jumpers, located on the Cat. No. 772A card, must be set to “Yes”. This enables the Cat. No. 791 card bypass output and sends a full-range signal to the hearing-impaired output. CP650s shipped with a Cat. No. 791 card have the correct jumper settings. See Figure 4–2 .
® Dolby Model CP650 Installation Manual Final Adjustments If your CP650 is equipped with a Cat. No. 791 Crossover Card: Follow the previous steps to set the Main bypass level trimpot for correct low-frequency level matching. 12345678 MAIN HF SERIAL DATA Lt Rt Video Clamp RTA1 RTA2 MIC MUX SIGNAL PRESENT Lt Rt L C R Ls Rs Sw Mic Bypass OK OK + Normal Bypass With the unit in bypass, adjust the HF bypass level trimpot for correct low/high-frequency balance.
® Dolby Model CP650 Installation Manual Final Adjustments menu OK Press the left menu button to move to the Optical Surround Delay menu. Optical Surround Delay > xxx mSec OK Rotate the front-panel knob to show the desired delay, then push the OK button. You can verify that the delay setting is acceptable by listening to a familiar Dolby® A-type film that ideally contains both center-channel dialogue and some discernible surround sound. The Dolby Cat. No.
® Dolby Model CP650 Installation Manual Final Adjustments menu OK Press the left menu button to move to the Digital Surround Delay menu. Digital Surround Delay > xxx mSec OK Rotate the front-panel knob to show the desired delay then push the OK button. Tables 7–1 and 7–2 show approximate delay values (in milliseconds) based on theatre width and length. Setting of surround delay should be verified by listening at various locations in the theatre.
® Dolby Model CP650 Installation Manual Final Adjustments Length (meters) Table 7–2 Surround Delays Based on Theatre Dimensions (in Meters) Width (meters) 7.
® Dolby Model CP650 Installation Manual Final Adjustments Dynamic Thread a loop of Cat. No. 1010 Digital Soundhead alignment test film through the projector, analog soundhead, and digital soundhead. Run the projector. Proj 1 menu OK Dolby Digital Reader Delay > xxx Perforations = xxx Perfs 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 Model CP650 Installation Manual 7.5 Final Adjustments Nonsync Level Adjustment Press the left menu button to move to the Nonsync 1 Level (or Nonsync 2 Level) menu. Nonsync Level > xx Play a CD or cassette, etc, on the nonsync device and adjust the front-panel knob for the desired level in the theatre. If possible, select a recording that has a natural ambience such as an orchestral work. Note: During nonsync level setting, the main fader level is fixed at 7.0.
® Dolby Model CP650 Installation Manual 7.6 Final Adjustments Mono Level Trim and EQ Adjustment menu OK Press the left menu button to move to the Mono Level Trim menu. Mono Level Trim >-xx dB Thread and play a mono film familiar to you. While the film is running, adjust the front-panel knob to the desired loudness level. Note: During mono level setting, the main fader level is fixed at 7.0. This makes special fader settings for mono films unnecessary.
® Dolby Model CP650 Installation Manual 7.7 Final Adjustments Assigning Preset Fader Levels menu OK Preset Fader Levels >Format xx Fader: xx.x Press the left menu button to move to the Preset Fader Levels menu. Preset levels can be assigned to each CP650 format button. Rotate the front-panel knob to select the format button you wish to preset. 01, 04, 05, 10, 11, U1, U2, NS Press the center menu button to move the selection to “Fader:”, then rotate the front-panel knob to the desired level setting.
® Dolby Model CP650 Installation Manual 7.8 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. Press the left menu button to move to the User Format 1 menu. User Format 1 > Format xx format name User Format 1 >Format 80 Digital Input OK Saving Changes... 1X User Format 2 >Format 65 Public Address LsRs OK Saving Changes...
® Dolby Model CP650 Installation Manual 7.9 Final Adjustments Assigning NS Button Format The nonsync button, “NS,” can be assigned to any available format. Then, when the button is pressed, that format will be selected. Follow the procedure in the previous steps. 7.10 Format 80/81 PCM Options Use this menu to change the settings for processing a PCM digital input to the Cat. No. 790 or 794 card, or the first digital input of the Cat. No. 778 card (Option Card I/O connector).
® Dolby 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. menu OK Press the left menu button to move to the Reversion Mode menu. Reversion Mode >Normal Rotating the front-panel knob will switch the CP650 between Normal and No Reversion.
® 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. menu OK Noise Gating Active Press the left menu button to move to the Noise Gating Active screen. When this menu item is selected, connecting certain automation port terminals to ground will cause pink noise to be sent to individual or all channels.
® Dolby Model CP650 Installation Manual Final Adjustments 7.14 Running Auditorium Assist The Auditorium AssistTM feature, included in CP650 operating system software version 2.0 and higher, provides an indication of the stability and characteristics of your theatre’s speakers, crossovers, amplifiers, and auditorium acoustics. The first time it is used, the frequency response and sound level of each speaker are checked and stored in the CP650 memory.
® Dolby Model CP650 Installation Manual 7.14.2 Final Adjustments Establish Reference Measurements To move the display to the Auditorium Assist menu, press the left menu button multiple times, or press and hold the button while rotating the front-panel knob. + Auditorium Assist No Reference → Set Reference A “No Reference” display means there are no reference measurements stored in CP650 memory.
® Dolby Model CP650 Installation Manual 7.14.3 Final Adjustments Auditorium Sound Check The Auditorium Assist sound-check function can be performed at any time. To move the display to the to the Auditorium Assist menu, press the left menu button multiple times, or press and hold the button while rotating the front-panel knob. + Auditorium Assist → Check Auditorium Set Reference OK Use the middle menu button to choose Check Auditorium, then press the OK button to begin the process.
® Dolby Model CP650 Installation Manual 7.14.4 Final Adjustments “FAIL” Parameters Noise Floor A failure is indicated if a new auditorium noise floor measurement differs from the saved reference measurement by more than ±10 dB. The measurement is taken at a bandwidth between 20 Hz and 16 kHz. The noise level in the auditorium is an important part of any theatre environment. This test is designed to measure the room noise, and to determine if it has changed significantly.
® 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. Note: When Noise Floor Optimization is enabled, a fader setting other than 7 can cause signal clipping.
® Dolby Model CP650 Installation Manual Final Adjustments 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. + Clock Set Press the left menu button, or press and hold the button while rotating the front-panel knob to move to the Clock Set menu. >Hour:xx Min: xx Hour Press the middle menu button to choose between setting Hour and Minute. Rotate the front-panel knob to set the times.
® Dolby Model CP650 Installation Manual Final Adjustments 7.17 Date Set Press the left menu button to move to the Date Set menu. Date Set xx >Day: Month: xx Year : xx Day Month Press the middle menu button to choose between setting the Day, Month, or Year. Rotate the front-panel knob to make the settings. Year OK Saving Changes... Press the OK button to save the settings. 7.
® Dolby Model CP650 Installation Manual Chapter 8 Accessories 8.1 Introduction This chapter covers installation of the Cat. No. 779 Remote Control and the Cat. No. 771 Remote Fader. Before installing remote units, read these general considerations: • No more than three remote units (in any combination) may be used with a CP650. A customer-supplied auditorium fader can be connected in addition to the remotes, but it cannot be operated at the same time as any remote.
® Dolby Model CP650 Installation Manual 8.2 Accessories Cat. No. 779 Remote Control Installation Format Buttons Used to select the sound format: 01 Mono 04 Dolby A-Type 05 Dolby SR 10 Dolby Digital 11 External 6-Channel Input U1 Default: Format 13 (can be user-defined) U2 User-defined during setup NS Default: Format 60 Non-sync 1 (can be user-defined) Fader Level Display Displays fader setting. Ranges from 0.0 to 10.
® 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. • If the remote control will stand alone, we recommend placing the hole in the side of the housing.
® Dolby Model CP650 Installation Manual 8.2.4 Accessories 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 J1 SW1 SWITCH SIDE VIEW Set switch SW1 to any setting except 0 Figure 8–4 SW1 Address Switch Location Use a small flat-blade screwdriver to set switch SW1. Do not set the arrow to the “0” position, because that setting generates an error message and disables the unit.
® Dolby Model CP650 Installation Manual Connect to the CP650 1. Connect the interface wires to the six-way connector shown in the figure below. If you cannot locate the connector, you can order one (Part No. 70206) from Dolby Laboratories. 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. CP650 rear panel REMOTES AND AUD.
® Dolby Model CP650 Installation Manual 8.3 Accessories Cat. No. 771 Remote Fader Installation The Cat. No. 771 Remote Fader can be mounted on a wall or in a console, or can stand alone. To install the remote fader: 1. Remove the four screws from the corners of the front-panel. Store the screws nearby and remove the rear housing. Caution: Do not touch circuit-board components. Static electricity can damage components. 2. Make a hole in the housing for the interface wire.
® Dolby Model CP650 Installation Manual Chapter 9 Maintenance and Troubleshooting 9.1 Print Cleanliness As with any soundtrack, keeping the film print clean will give best performance. The Dolby® Digital print format has robust error correction information encoded along with the audio data, and the CP650 uses a powerful digital error-correction technique, allowing the data to be read perfectly even if scratches and dirt are present. However, best performance will be obtained if the print is kept clean.
® Dolby Model CP650 Installation Manual 9.2.1 Maintenance and Troubleshooting 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. The LED assembly is Dolby Part No. 83308. Installation 1. Turn off power to the Cat. No. 701 soundhead. 2.
® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting Alignment Warning: Class 2 LED Product per EN 60825-1:1996. Do not stare into the red LED beam. Do not attempt to view the LED beam with any type of optical device. 1. Connect an oscilloscope (20 MHz minimum bandwidth) to test points on the setup control panel. Some digital oscilloscopes may not be usable for this procedure even though they may have the required bandwidth. a.
® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting Left Graticule VIDEO TRACE (CH1) Light through perf holes Right Graticule Data 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. Loosen the 2.5 mm hex screws and carefully rotate the LED assembly while watching the scope image.
® Dolby Model CP650 Installation Manual 9.2.2 Maintenance and Troubleshooting 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. With the rear cover removed, the lamp will be visible but still attached to the rear cover assembly by its two supply wires. Slide the lamp out of its base.
® Dolby Model CP650 Installation Manual Maintenance and Troubleshooting 9.3 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 --14VB +15V MIC MUX +5V Rs Sw +5VB +14VB Figure 9–9 Power Supply Voltage Test Points Table 9–1 Main Power Supply Voltage Ranges Test Point +15 V –15 V +5 V Voltage Range 14.5 to 15.8 –14.5 to –15.8 4.85 to 5.
® Dolby Model CP650 Installation Manual 9.3.2 Maintenance and Troubleshooting Exploded View and Board Locations Cat. No. 790 Dolby Digital Surround EX Decoder / Digital Aux. Input Card Cat. No. 773 Dolby Digital Decoder Cat. No. 791 Digital Crossover Card (for use with Cat. No. 790 only) Bypass Mains Voltage Selector Switch (110/220 VAC) - or Cat. No. 778 Dolby Digital Surround EX Decoder / Digital I/O Card Cat. No. 774A System Controller Cat. No.
® Dolby Model CP650 Installation Manual 9.3.3 Maintenance and Troubleshooting 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.
No sound, front-panel normal. No sound, front-panel dark, power button is illuminated, and system is already in Bypass. Check power feed to power amplifiers for blown circuit breaker or fuse or accidental disconnection. Power amplifiers switched off. 9-9 Check same components as mentioned above. Then verify selected format, mute status, and fader setting. If no formats produce sound, there may be a CP650 internal problem. Call your local service engineer.
The remote solar cell preamp board used with LED analog readers may have failed. Digital reader LED not working, Dolby Digital decoder board Cat. No. 773 not installed or not working, nonDolby Digital print being played, film not threaded correctly in reader, reader failure. Solar cell connections may be loose or damaged. The analog LED or exciter lamp or power supply may have failed or the wrong projector may be selected. Probable Cause Power button illuminated. Front-panel dark. There is sound.
Front-panel display reads “Reverted!” when Format 10 is selected and stays in optical Dolby SR. CP650 won’t accept a format selection, and displays a “Format Unavailable” message. 9-11 No Dolby Digital data available, not a Dolby Digital print, projector not running, or data blocks badly damaged. Digital reader LED not working, non-Dolby Digital print being played, film not threaded correctly in reader, reader failure. Formats 13, 80, or 81 require the Cat. No.
Audio grounding scheme may need changing. Malfunctioning exciter lamp or lamp power supply. Whistles in sound. Hum (power line frequency) in sound. 9-12 Stray light striking the stereo solar cells. Audio grounding scheme may need changing. Probable Cause Rumble in sound, regardless of format. RUMBLES, WHISTLES, HUM IN SOUND Symptom ® Dolby Model CP650 Troubleshooting Chart • If hum persists, turn out all lights in the booth to check if stray light is striking the cells.
Defective power amplifier for that channel. Malfunctioning board in CP650. Power amplifier input level setting turned down. Defective power amplifier, external crossover, or wiring for that channel. Probable Cause 9-13 Wiring from the stereo solar cell to the CP650. The sound from one channel is distorted Defective speaker for that channel. (The booth and you can hear the distortion through the sound is OK but sound in the auditorium is bad). booth monitor at normal listening level.
You hear an echo in a small theatre. The sound level in bypass is higher or lower than the normal sound level. When a stereo film is projected, the sound appears to be coming from the wrong speakers. Sound from the front (screen) channels is leaking into the surround channel. The sound from two or more channels is distorted and you can hear the distortion through the booth monitor at normal listening level. Symptom ® Call service engineer. Call service engineer. Call service engineer.
Sound from a mono film is distorted, as is sound from the center channel of a stereo film. Nonsync sound is heard in other formats. There is distortion when you play nonsync sound, but sound from the film is not distorted. Symptom ® Malfunctioning loudspeaker. Malfunctioning power amplifier. 9-15 Defective Cat. No. 772 board. The nonsync source output level is set far too high or there is a balanced/unbalanced wiring problem. Excessive output level from nonsync source.
The CP650 freezes into one format and does not accept any other selected format when you press the front-panel buttons. With an automation system connected to the CP650: Projector changeover command does not change the sound to the output of the selected projector and the front-panel indicators P1 or P2 do not light according to the projector selected. CHANGEOVER AND CONTROL TROUBLES Symptom ® Call service engineer. Unplug the D-connector from the back of the CP650.
You can hear pops or thumps during projector changeover. Symptom ® Malfunctioning Cat. No. 772 board. 9-17 If the projector changeover relay is AC powered, a capacitor soldered to the relay coil terminals may be defective. If the projector changeover relay power is DC, a diode should be soldered across the winding of the relay to prevent switching noise from leaking into the audio wiring. This diode may be missing or defective.
MAINS POWER 100-240VAC 50/60 Hz 120W D E E FILTER GRN/YEL N L VARISTOR VARISTOR E A N L BLU BLU BRN BRN GRN/YEL VOLTAGE SELECTOR SWITCH ACCESSIBLE THROUGH TOP COVER HOLE (SHOWN IN 110V POSITION) DISCHARGE TUBE 3500V N L CAT.NO.793 SNUBBER / TERMINAL BOARD BRN BLU T 6.
MAINS POWER 100-240VAC 50/60 Hz 120W D E E FILTER N L GRN/YEL VARISTOR VARISTOR E A N L BLU BLU BRN BRN GRN/YEL VOLTAGE SELECTOR SWITCH ACCESSIBLE THROUGH TOP COVER HOLE (SHOWN IN 110V POSITION) DISCHARGE TUBE 3500V N L CAT.NO.793 SNUBBER / TERMINAL BOARD BRN BLU T 6.3A L 250 VAC FUSE MAINS INLET / FILTER MODULE ® 110V BYPASS FUSE S1 220V 110 VAC: T 200MA L 220 VAC: T 100MA L ON BYPASS ORG BRN WHT BLK 3 1 E BLU YEL BLU 3.
COVER CCD ASSY DPN 67195 SCREW M4 X 10 PAN DPN 60036 4-PL SCREW M3 X 6 BTN SKT BLK DPN 60180 6-PL CCD DRIVER BOARD CAT. NO. 634 / 634R / 934R CAT. NO. 701 JUMPERS: 2X CAT. NO. 700 JUMPERS: 1X SCREW M4 X 6 PAN POZI BLK DPN 60269 2-PL HOUSING REAR CONN PLATE DPN 67161 SPRING CPRSN 1/2 LG .600 OD DPN 65173 POWER SUPPLY ASSY DPN 83303 (SHOWN) CAT. NO. 701 DPN 83225 (NOT SHOWN) CAT. NO. 700 1.
BRACKET CLAMP DPN 67198 SCREW M4 X 12 PAN DPN 60134 2-PL SPRING K=0.2 LB/IN 1-1/2" LONG DPN 65154 SCREW M4 X 6 PAN STAR DPN 60245 2-PL DASH ARM DPN 67176 DASHPOT 1.5" CYLINDER FACTORY ADJUSTED NON-USER REPLACEABLE BRACKET DASHPOT DPN 67115 SCREW M4 X 12 CAP SKT BLK DPN 60229 2-PL 9-21 SCREW M4 X 6 PAN STAR DPN 60245 SPRING BASE DPN 67119 WASHER 1/4" FLAT DPN 61206, 2-PL FS WASHER M3 FLAT DPN 61214, 2-PL SCREW M3 X 6 BTN SKT BLK DPN 60180, 2-PL CAT. NO.
® Dolby Model CP650 Installation Manual Appendix A Software Operations A.1 Display Information About This CP650 Unit A User Menu item (DIP switch 6 down) provides information about the software and hardware installed in your CP650. Press the left menu button multiple times to step through the menus to About This CP650. 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: System v.a.b.c.d Cat.No.
® Dolby Model CP650 Installation Manual A.2 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). 12345678 SERIAL DATA Lt Rt Video Clamp RTA1 RTA2 MIC MUX SIGNAL PRESENT Lt Rt L C R Ls Rs Sw Mic Bypass 2. Run the CP650 Setup Software on the PC. 3. From the “Action” menu, choose “Connect”, or click on the connect icon. 4.
® Dolby Model CP650 Installation Manual A.3 Software Operations Transferring Settings Between Two CP650s 1. Connect the PC to the source CP650 using a serial cable. 2. Run the CP650 PC Setup Software on the PC. 3. From the “Action” menu, choose “Connect” or click on the connect icon. 4. If prompted, choose “Retrieve” to retrieve existing cinema processor settings. 5. After the settings have been retrieved, choose “Disconnect” from the “Action” menu, or click on the disconnect icon. 6.
® Dolby Model CP650 Installation Manual 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 Cat. No. 790 Dolby® Digital Surround EXTM decoder board installed (standard Model CP650), the Left Surround and Right Surround outputs on this connector are disabled.
® Dolby Model CP650 Installation Manual Back Panel Connectors Option Card I/O Connector 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.
® Dolby Model CP650 Installation Manual Back Panel Connectors The optional Cat. No. 778 card has four pairs of AES inputs, the first of which provides a single digital bitstream input (Dolby Digital), or up to eight channels of digital PCM audio input. The card provides eight channels of digital audio outputs while supporting the 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.
® Dolby Model CP650 Installation Manual B.2 Back Panel Connectors Input Connectors 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.
® Dolby Model CP650 Installation Manual Back Panel Connectors Motor-Start Connector 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. This configuration is identical to the one used on the Dolby CP500. Motor Start: Motor Off: Less than 1 VDC with respect to signal ground. Greater than 3.
® Dolby Model CP650 Installation Manual Back Panel Connectors MIC MUX Connector on front setup control panel 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.
® Dolby Model CP650 Installation Manual Back Panel Connectors 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.
® 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.
® Dolby Model CP650 Installation Manual Back Panel Connectors Automation I/O Connector: Pins Used for Noise Gating The table below lists the pin numbers used for the Noise Gating function. See Section 7.13 for a description of this setup menu item. Grounding the listed pin will send pink noise to the listed channel when the setup menu is set to Noise Gating.
® Dolby Model CP650 Installation Manual Appendix C Optical Surround Level Trim Use this procedure to subjectively balance front and surround loudspeaker levels using the Cat. No. 151B test film. The film contains band-limited noise, restricted to the range 500 Hz to 2 kHz. The noise is cycled between the front center speaker and rear surround speakers. The surround level should have already been set using the final output level calibration procedure in Section 4.7.6.
® Dolby Model CP650 Installation Manual Optical Surround Level Trim >+1.2 dB OK Saving Changes... menu OK Optical Surround Level Trim Walk around the auditorium, and make an overall judgment of the surround level compared to the screen level. Because of the “diffuse” nature of the surround sound, it will commonly require a slight increase in surround level to get it to match the screen level. The tonal balance and acoustic level should subjectively match.
® 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. D.
® Dolby Model CP650 Installation Manual D.2 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. Format 01 Academy Mono Optical Short name: Mono Audio Description: Optical mono audio comes in on either projector’s optical input, has no noise reduction applied, and is intended to produce audio on the center channel only.
® Dolby Model CP650 Installation Manual Format Definitions Format 10 Dolby Digital Film (Cat. No. 773 required) Short name: Dolby Digital Audio Description: The input is from the Dolby Digital reader, which provides the signal to the Dolby Digital decoder and creates six discrete channels (L, C, R, Ls, Rs, SW). The optical soundtrack is processed as in Format 05 at all times, to enable rapid reversions to analog film sound when needed. On a reversion event, the following actions take place: 1.
® Dolby Model CP650 Installation Manual Format Definitions Format 20 35 mm Magnetic, L, C, R 3-Channel Short name: 3-Channel Mag Audio Description: This magnetic audio format has four discrete channels (L, C, R, S, though S is unused) and is input through the six-channel analog input. The magnetic preamplifier units (MPUs) are external, and the Academy mag filters (if required) are also external to the CP650. There is no derived subwoofer.
® 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 Public Address Surround Channels Short name: Public Address LsRs Audio Description: A single channel is input through the microphone input connector. The audio output is sent to Ls and Rs only.
® Dolby Model CP650 Installation Manual Format Definitions Format 74 Video Pro Logic No SW Nonsync 1 Short name: Vid Pro Logic No SW Audio Description: This external audio format has two discrete input channels (L, R) and is input through the Nonsync 1 input connectors. The audio is processed with Pro Logic decoding and output on channels L, C, R, with a mono signal to Ls and Rs. There is no derived subwoofer.
® Dolby Model CP650 Installation Manual Format Definitions Format 81 (Cat. No. 790 required) Bitstream Dolby Digital Surround EX Short name: Fmt 80 w/Surr. EX Audio Description: The input signal is a digital bitstream into the Option Card I/O input. The signal is Dolby Digital (consumer) decoded, and the resultant L, C, R, and SW signals are sent to the output.
® Dolby Model CP650 Installation Manual Format Definitions Format 87 (Cat. No. 790 or earlier Cat. No. 794 required) External 6-Channel with Surround EX Short name: Fmt 11 w/Surr. EX Audio Description: This external audio format is a combination of Formats 11 and 13, and can be used when an external digital processor is connected. Signals of six discrete channels (L, C, R, Ls, Rs, SW) are connected to the six-channel analog input connector. L, C, R, and SW are sent discrete to the outputs.
® 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. Format 90 (Cat. No.
Dolby SR Optical Dolby Digital Film External 6-Channel Dolby Digital Surround EX film 05 10 11 13 Non-sync 2 P.A. Center Channel P.A. Surround Channels Test Tone Video PA Non-sync 1 61 64 65 66 70 75 74 73 Video mono Non-sync 1 Video LCR Non-sync 1 Video Pro Logic no SW Non-sync 1 Video Pro Logic with SW Non-sync 1 Non-sync 1 60 71 70 mm Dolby Stereo 42 22 35 mm Magnetic.
Master Digital Input Master Digital In + Surround EX 5-Ch. Screen 5-Ch. Screen + EX Ext. 6-channel with surround EX 6-Channel PCM 6-Channel PCM + Surround EX 7-Channel PCM Dolby SR 2-track Printmaster Dolby SR 2-track Printmaster 81 85 86 87 88 89 90 92 93 Format Name 80 Format Number Input AES1 Six-channel S/PDIF AES/EBU S/PDIF AES/EBU S/PDIF AES/EBU, S/PDIF AES x 3 Nonsync 1 Six-channel L, R input Cat. No. 778 AES x 4 Cat. No. 778 Cat. No. 778 AES x 3 Cat. No. 790 Cat.
® Dolby Model CP650 Installation Manual Appendix E External Control of CP650 The CP650 can be controlled by devices connected to the RS-232 serial data connector, or to the remotes connector located on the rear of the CP650. This appendix is for use by customers who are highly qualified to modify hardware and write software.
® Dolby Model CP650 Installation Manual External Control of CP650 Commands Key format_button fader_level fader_setting mute Range of Values 0 .. 7 inticates which button on the CP650 front-panel should be applied: Data Button Applied 0 Format 01 1 Format 04 2 Format 05 3 Format 10 4 Format 11 5 User Format 1 6 User Format 2 7 Nonsync Format Any Preset Fader Level associated with the indicated button is also applied, and the LED for the selected button is illuminated. 0 ..
® Dolby Model CP650 Installation Manual External Control of CP650 Query Querying an Individual Parameter “=?” returns a “=” output line for that key. Querying All Available Parameters “all=?” results in a series of output lines representing every known key in the serial control system. Query Errors If a query cannot be parsed or does not match a known parameter, “error” will be output. External controllers must wait for the response to a query before proceeding. Notes 1.
® Dolby Model CP650 Installation Manual E.2 External Control of CP650 Control via Remotes Connector CP650 control using single-wire communications via the remotes connector is available in CP650 System software version 1.1.5 and later. To do so, it is recommended that a Cat. No. 779 Remote Control or Cat. No. 771 Remote Fader be used. Dolby Laboratories occasionally receives requests to interface the CP650 to other types of computers, for the purposes of remote control.
® Dolby Model CP650 Installation Manual External Control of CP650 The DDCMP Protocol Digital Data Communications Message Protocol (DDCMP) was developed by Digital Equipment Corporation as a serial link layer protocol. All messages between the CP650 and the remote accessories take place within the context of the DDCMP protocol. An important reference document, ddcmp.txt, is published by Digital Equipment Corporation The network is a half-duplex multipoint network.
® Dolby Model CP650 Installation Manual External Control of CP650 Note: All remotes must parse all messages. This requires looking at the length and cannot be ignored. To command the CP650 to toggle the mute setting, the data message must have a value of zero. If the CP650 was unmuted before receiving this command, it will be in the muted mode afterwards, and if muted before, it will be unmuted after.
® Dolby Model CP650 Installation Manual Appendix F Setup and User Menus 12345678 F.1 CP650 Setup Menu DIP switch 6 UP The Bsl and Bsr channels (shown in italics) are available only with Cat. No. 790 installed. The Le and Re channels (shown in italics) are available only with Cat. No. 791 installed. B-Chain: menu menu OK OK 1 Notes Format and CP650 Status Display Le/Re Channels 0–10 Enable/Disable Le/Re channel support (with Cat No. 791 crossover installed) Enter room readings: 45–108.
® Dolby Model CP650 Installation Manual Setup and User Menus CP650 Setup Menu, B-Chain (continued): menu menu OK OK Notes EQ center frequency: EQ filter width (“Q”): Level Cut: Channel: Level: 25–125 Hz 0.5, 1, 2, 4 0 to –12 dB L, C, R, Ls, Bsl, Bsr, Rs 1–127 (0.3 dB steps) Digital Subwoofer Level Adjust (Final) Level: 1–127 (0.3 dB steps) 13 Optical Subwoofer Bandwidth 50/100 Hz 50/100 Hz 14 Optical Subwoofer Level Level: Polarity: Center Noise: 1–127 (0.
® Dolby Model CP650 Installation Manual Setup and User Menus CP650 Setup Menu, (continued): menu menu OK OK 24 Bypass Level Adjust 25 26 27 28 29 30 31 32 Optical Surround Level Trim Optical Surround Delay Adjust Digital Surround Delay Adjust Dolby Digital Reader delay Nonsync 1 Level Adjust Nonsync 2 Level Adjust Mono Level Trim Mono EQ Adjust 33 Preset Fader Levels 34 User Format 1 Select 35 User Format 2 Select 36 Nonsync Format Select Notes OK –3 to +6 dB 20–150 ms 20–150 ms 16–512
® Dolby Model CP650 Installation Manual Setup and User Menus 12345678 F.2 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 OK OK Notes This is the top-level menu display.
® Dolby Model CP650 Installation Manual Setup and User Menus CP650 User Menu, Continued menu menu OK OK Notes 18 Contrast Adjustment Set the display contrast. 19 Event Log Scroll up and down the event listing. 20 21 Useful for telephone discussions.
