Model CP650 Digital Cinema Sound Processor User’s Manual Issue 1 Part No.
CP650 User’s Manual Dolby Laboratories Inc Corporate Headquarters Dolby Laboratories Inc 100 Potrero Avenue San Francisco, CA 94103-4813 Telephone 415-558-0200 Facsimile 415-863-1373 www.dolby.com European Headquarters Dolby Laboratories Wootton Bassett Wiltshire, SN4 8QJ, England Telephone (44) 1793-842100 Facsimile (44) 1793-842101 WARNING: To avoid the risk of electrical shock or fire, do not attempt to service the CP650 or remove the front panel.
CP650 User’s Manual Table of Contents Chapter 1 Introduction 1-1 1.1 About the CP650 ......................................................................................1-1 1.2 About This Manual...................................................................................1-1 Chapter 2 Operating Instructions 2-1 2.1 The CP650 Front Panel.............................................................................2-1 2.2 Normal Operation ..............................................................
CP650 User’s Manual Chapter 1 Introduction 1.1 About the CP650 The Dolby CP650 Digital Cinema Sound Processor is the heart of your theatre sound system. All sound sources are connected to the CP650, which processes the signals appropriately and feeds them to the power amplifiers. Entirely self-contained, the CP650 provides both Dolby Digital and Dolby analog processing. An easy-to-read front panel screen and uncomplicated front-panel buttons make it easy to operate.
CP650 User’s Manual Chapter 2 Operating Instructions 2.1 The CP650 Front Panel Projector Signal Indicators Bypass Power Supply Failure Indicator P1 and P2 show which projector's output is being processed by the CP650. Indicates a problem detected in the bypass power supply. Setup Control Panel Access Door Level Display For use by the service engineer. Displays fader setting. Ranges from 0.0 to 10. Normally set to read 7.0. Front Panel Display Displays current format and processor condition.
CP650 User’s Manual Operating Instructions L C R Ls Rs Sw The example above shows the normal display when the CP650 is playing a film with a Dolby Digital soundtrack. The top two lines display the current format selected. The bottom left area contains a bar graph display of the sound signals present on each channel. As the film plays, the bars will move, confirming that sound is passing through the CP650. M1 indicates that the projector 1 motor contact is closed (in two-projector installations).
CP650 User’s Manual Operating Instructions Power button The power button operates the main power supply for the CP650. In the ON position, the CP650 is powered by the main supply. As with other Dolby cinema processors, the CP650 has a separate backup (bypass) power supply. In the OFF position, the unit is powered by the built-in bypass power supply, and the power button glows red.
CP650 User’s Manual Operating Instructions Use the right-hand OK button to accept the setting displayed on the front panel screen and store it in CP650 memory. Any changes to settings will occur immediately but will not be saved until this button is pressed. Leaving the current menu before pressing the OK button will cause the change to be discarded. Note: For convenience, pressing the current format (glowing) button causes the CP650 to immediately return to the top-level screen display.
CP650 User’s Manual CP650 Loading......... ........ Built: XXXyy Time Running self test Checking xxxxxxxx Checking yyyyyyyy Checking zzzzzzzz Operating Instructions When power is first applied, the first screen shows that the software is loading into CP650 memory, and displays the software date. Next, a brief self-test of various internal circuitry is automatically started. Finally, the normal operating screen appears. Details on the items displayed are described earlier in this chapter.
CP650 User’s Manual 2.2.3 Operating Instructions Main Fader The main front panel fader knob on the CP650 controls the volume level in the theatre. It works in both normal and bypass operation. When the CP650 has been correctly installed, setting the fader to 7.0 plays the film at the level at which it was mixed. This is the proper level for any Dolby encoded film.
CP650 User’s Manual 2.2.4 Operating Instructions Setup for Automatic Selection of the Dolby Digital Format CP650 units equipped to play Dolby Digital films can be set up to sense the presence of Dolby Digital data on the film and automatically switch the CP650 to the Dolby Digital format from any other film format. In other words, if the CP650 is operating in Format 01, 04, 05, or 11, it will automatically switch to Format 10 when a Dolby Digital film is detected.
CP650 User’s Manual 2.2.5 Operating Instructions Assigning Formats to the U1, U2 and NS Buttons The U1 and U2 buttons (User Format 1 and User Format 2) and the NS button (nonsync) can be assigned to any available format. Then, when the button is pressed, the assigned format will be selected. menu OK Press the left menu button multiple times to step through the menus to User Format 1.
CP650 User’s Manual 2.2.6 Operating Instructions The Mute Function Use the mute function between intermission music and starting the projector to prevent the audience from hearing annoying thumps and leader crackle at the beginning of the show. It is also useful if the film breaks or runs out while the projector is active, since it suppresses the very loud signal that occurs when leaders or tails pass through the projector.
CP650 User’s Manual OK Operating Instructions Saving Changes... Press the OK button to save the change. Press the illuminated format button to return to normal operation. 2.2.7 Setting the Front Panel Display Contrast The liquid crystal display (LCD) contrast can be adjusted to give the clearest possible readability. menu OK Press the left menu button multiple times to step through the menu items to Contrast Adjustment.
CP650 User’s Manual 2.3 Operating Instructions Bypass Operation The CP650 has an independent power supply for emergency operation. If the main power supply or processor circuitry fails, the unit will automatically switch to bypass operation, allowing the show to continue with limited sound processing functions. Bypass operation is indicated by the front-panel power button glowing red.
CP650 User’s Manual Chapter 3 Maintenance and Adjustments Having the very best equipment in your installation does not in itself guarantee that you will always achieve best results. A number of routine maintenance and adjustment procedures, requiring no special test equipment or technical knowledge, are necessary to realize the full potential of the sound system on a day-to-day basis. These procedures can also prevent costly show cancellations and service calls. A Dolby Cat. No.
CP650 User’s Manual 3.1.3 Maintenance and Adjustments Replacing the Exciter Lamp (Cat. No. 700 Digital Soundhead) The exciter lamp in the Cat. No. 700 Digital Soundhead has been designed for long life and should provide over 8,000 hours of reliable use under normal circumstances. Routine replacement will depend on your theatre’s hours of operation. Use only a General Electric EPT, reflector-type, 42 Watt lamp (Dolby Part Number 34010). To replace the exciter lamp: Disconnect AC mains power.
CP650 User’s Manual 3.2 Maintenance and Adjustments Dolby Level Calibration Proper decoding of Dolby encoded soundtracks requires careful level matching of each channel of each soundhead and the CP650. When the CP650 was first installed, the technician made this adjustment for you. We recommend that you routinely perform these steps to compensate for the normal aging of the soundtrack light source.
CP650 User’s Manual OK Maintenance and Adjustments Please Wait. ....... L 0 0 R 0 0 0 0 0 0 OK Automatic Optical Level Adjust done. Press OK to save the Current settings. 1x Press the OK button. With the Dolby tone test film running, the CP650 automatically calibrates the left and right channels to the Dolby tone playing on the film. The CP650 will display this screen when the calibration has finished. Press the OK button to save the settings.
CP650 User’s Manual Maintenance and Adjustments The sound quality of the digital track degrades differently than the analog track. With any analog track, print wear will reduce the quality more or less gradually; the more wear, the lower the quality of the sound. With a digital soundtrack, wear will have no audible effect until the print is degraded beyond usability. By this time the picture quality is usually unacceptable too.
CP650 User’s Manual Chapter 4 Troubleshooting Your theatre sound system consists of a number of critical audio components in addition to the Dolby CP650. Thus, the first step when something goes wrong with the sound is to determine which component is causing the problem. If you are unable to solve the problem using the information that follows, call your local authorized service engineer. Appendix E contains a list of circuit boards available.
CP650 User’s Manual 4.3 Troubleshooting If Switching to Bypass Does Not Restore Sound 1. Check the film reader LEDs or exciter lamps, fader setting, and the mute button. Make certain that all components including power amplifiers are receiving AC mains power. 2. If the bypass power appears to work (front panel power button glows red), open the front panel access door and check if the signal present lights are flashing.
CP650 User’s Manual Symptom Possible Cause Troubleshooting Recommended Action NO SOUND AT ALL No sound, front panel lights look normal. No sound, front panel dark, power button not glowing. No sound, and switching to Bypass doesn’t restore sound. Verify that the selected format, mute status, and fader setting are correct. If no formats produce sound, there may be a CP650 internal problem. Call your local service engineer. See if AC mains panel circuit breaker feeding the CP650 is tripped.
CP650 User’s Manual Symptom Possible Cause Troubleshooting Recommended Action NO SOUND IN SOME FORMATS No Dolby Digital sound (Format 10). Front panel normal, analog film formats (05) play OK. No Dolby Digital data available. Not a Dolby Digital print. Projector not running. Digital data on the film badly damaged. Digital film reader not working Film not threaded correctly in digital reader.
CP650 User’s Manual Symptom Possible Cause Troubleshooting Recommended Action CONTROL PROBLEMS CP650 won’t accept a format button selection, and gives “Format Unavailable” message. CP650 doesn’t have the optional modules needed for that format, or that part of the system is not working. For example: Format 10 requires the Dolby Digital Cat. No. 773 board. When the digital Format 10 is selected, front panel display reads “Reverted!” and “Optical Dolby SR“. Formats 13, 80, or 81 require the Cat. No.
a CP650 User’s Manual Appendix A How to Identify Sound Tracks on Prints Edge of film Dolby Digital soundtrack Analog soundtrack Picture area A Dolby Digital film print or a stereo analog optical print (A-Type or SR), or a mono analog optical print should be identified as such on both the film can and leader. However, with handling, the identification may be lost.
CP650 User’s Manual Appendix B Advanced Operations B.1 Display The Event Log As in the previous section, the event log also provides useful information when explaining any problems to your service engineer. 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.
CP650 User’s Manual B.2 Advanced Operations Display Information About This CP650 Unit The last menu items provide information about the hardware and software installed in your CP650 unit. This information is useful when discussing problems to your service engineer. 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.
CP650 User’s Manual Appendix C Test and Demonstration Films Several test and demonstration films produced by Dolby Laboratories are available from your equipment supplier. For proper system maintenance, the Cat. No. 69T Test Film is required and the Cat. No. 251 Jiffy Test Film is strongly recommended. The Cat. No. 69T Test Film should be formed into loops for ease of use. Other test films are for use by your service engineer with special test equipment. C.1 Cat. No.
CP650 User’s Manual Test and Demonstration Films Projector Wow and Flutter, Overall System Performance, Visual “Quick-checks,” and a Noise and Interference Test. • Duration: 8 minutes • Picture format: 35 mm color, can be screened either 1.85:1 widescreen or 2.39:1 anamorphic • Sound format: Dolby Digital and Dolby SR C.3 Cat. No. 69P, Cat. No. 97, Cat. No. 151B, and Cat. No.
CP650 User’s Manual Appendix D The Evolution of Dolby Film Sound Going to the movies today is more exciting and involving than ever before, thanks in large part to a continuing effort to improve film sound undertaken by Dolby Laboratories in the early 1970s. Indeed, the history of cinema sound over the past two decades closely mirrors the history of Dolby film sound technologies. Optical soundtracks The photographic, or “optical,” soundtrack was the first method of putting sound on film.
CP650 User’s Manual The Evolution of Dolby Film Sound speakers. The result was to ignore the improved high-frequency response of the newer, better units. To forestall compatibility problems, in the late 1930s a de facto standardization set in, the cinema playback response that today is called the “Academy” characteristic. Cinema owners knew what to expect from the films, and therefore what equipment to install.
CP650 User’s Manual The Evolution of Dolby Film Sound Dolby gets involved By the late 1980s, the situation that prevailed in the mid-1970s had completely changed. Thanks to new technology and a turnaround in the financial decline of the industry, almost all major titles by that time were being released with wide-range multichannel stereo soundtracks, as is the case today.
CP650 User’s Manual The Evolution of Dolby Film Sound The Digital age begins The next film sound development from Dolby Laboratories was Dolby Digital, introduced in 1992. Dolby Digital puts a six-channel digital optical soundtrack in addition to a four-channel SR analog track on 35 mm prints. This format is yet another significant step forward in film sound, providing independent left, center, right, left surround, and right surround channels, plus a sixth channel for bass effects.
CP650 User’s Manual Appendix E Reference Information List of Cat. Numbers Used Cat. No. 771 Cat. No. 772 Cat. No. 773 Cat. No. 774 Cat. No. 775 Cat. No. 776 Cat. No. 777 Cat. No. 779 Cat. No. 792 Cat. No.
CP650 User’s Manual Appendix F CP650 Menu Listing The options shown in bold are the default settings when the unit is shipped from the factory. menu menu OK OK Notes This is the top-level menu display.
