Dolby Laboratories CP650 User manual

Model CP650
Digital Cinema Processor
User’s Manual
Issue 3 Part Number 91570

Dolby® CP650 Digital Cinema Processor User’s Manual
Dolby Laboratories, Inc.
Corporate Headquarters
Dolby Laboratories, Inc.
100 Potrero Avenue
San Francisco, CA 94103-4813 USA
Telephone [phone]
Fax [phone]
www.dolby.com
European Headquarters
Dolby Laboratories, Inc.
Wootton Bassett
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Telephone [phone]
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EQUIPMENT MANUFACTURED BY DOLBY LABORATORIES IS WARRANTED AGAINST DEFECTS IN
MATERIALS AND WORKMANSHIP FOR A PERIOD OF ONE YEAR FROM THE DATE OF PURCHASE.
THERE ARE NO OTHER EXPRESS OR IMPLIED WARRANTIES AND NO WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, OR OF NONINFRINGEMENT OF
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CONTRACT, IN TORT, UNDER ANY WARRANTY, IN NEGLIGENCE, OR OTHERWISE, SHALL NOT
EXCEED THE COST OF REPAIR OR REPLACEMENT OF THE DEFECTIVE COMPONENTS OR ACCUSED
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(INCLUDING, BUT NOT LIMITED TO, DAMAGE TO SOFTWARE OR RECORDED AUDIO OR VISUAL
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LABORATORIES OR ITS AGENTS HAVE BEEN ADVISED, ORALLY OR IN WRITING, OF THE
POSSIBILITY OF SUCH DAMAGES.
WARNING:To avoid the risk of electrical shock or fire, do not attempt to service
the CP650 or remove the front panel. Do not remove the power supply housing
located on the rear of some digital soundheads. Refer all service and repairs to
qualified technicians.
Dolby, Pro Logic, and the double-D symbol are registered trademarks of Dolby Laboratories. Auditorium Assist and Part Number 91570
Surround EX are trademarks of Dolby Laboratories. All other trademarks remain the property of their respective owners. Issue 3
2006 Dolby Laboratories, Inc. All rights reserved. S06/14395/17501
Software Version 2.3.4.4

Dolby® CP650 Digital Cinema Processor User’s Manual
ii
Table of Contents
Chapter 1 Introduction
Chapter 2 Operating Instructions
2.1 The CP650 Front Panel............................................................................ 2-1
2.1.1 Front-Panel Display.................................................................... 2-2
2.1.2 Level Display ............................................................................. 2-4
2.1.3 Main Fader Knob ....................................................................... 2-4
2.1.4 Projector Signal Indicators......................................................... 2-4
2.1.5 Bypass Power Supply Failure Indicator..................................... 2-4
2.1.6 Bypass Power Button ................................................................. 2-4
2.1.7 Format Buttons........................................................................... 2-4
2.1.8 Setup Control Panel Access Door .............................................. 2-5
2.1.9 Mute Button................................................................................ 2-5
2.1.10 Menu Control Buttons................................................................ 2-5
2.2 Normal Operation .................................................................................... 2-6
2.2.1 Power On.................................................................................... 2-6
2.2.2 Main Fader ................................................................................. 2-7
2.2.3 Auditorium Fader ....................................................................... 2-8
2.2.4 Assigning Preset Fader Levels ................................................... 2-8
2.2.5 Automatic Selection of the Dolby Digital Format ..................... 2-9
2.2.6 Setting the Auto Dolby Digital Target ..................................... 2-10
2.2.7 Quick Sound Check—Rotating Pink Noise ............................. 2-10
2.2.8 Assigning Front-Panel Buttons to Formats .............................. 2-11
2.2.9 The Mute Function ................................................................... 2-11
2.2.10 Selecting the Power-On Format ............................................... 2-12
2.2.11 Setting the Front-Panel Display Contrast................................. 2-12
2.2.12 Operation with an Automation System .................................... 2-12
2.3 Bypass Operation................................................................................... 2-13

Dolby® CP650 Digital Cinema Processor User’s Manual
iii
Chapter 3 Maintenance and Calibration
3.1 Soundhead Maintenance...........................................................................3-1
3.1.1 Analog Sound System.................................................................3-1
3.1.2 Digital Sound System..................................................................3-1
3.1.3 Replacing the Cat. No. 700 Exciter Lamp ..................................3-1
3.2 Dolby Level Calibration ...........................................................................3-2
3.2.1 Automatic Calibration.................................................................3-3
3.2.2 Manual Calibration .....................................................................3-3
3.3 Film Print Cleanliness ..............................................................................3-4
Chapter 4 Troubleshooting
4.1 Troubleshooting Chart..............................................................................4-3
Appendix A Advanced Operations
A.1 Using Auditorium Assist .........................................................................A-1
A.2 Displaying the Event Log........................................................................A-2
A.3 Display Information About This CP650 Unit .........................................A-3
A.4 Format 80/81 PCM Options ....................................................................A-4
A.5 Remote Address.......................................................................................A-4
Appendix B The Evolution of Dolby Film Sound
Appendix C Reference Information
C.1 How to Identify Soundtracks on Prints ...................................................C-1
C.2 About Dolby Digital Surround EX..........................................................C-2
C.3 Test and Demonstration Films.................................................................C-4
C.4 List of Cat. Numbers Used ......................................................................C-5
Appendix D CP650 Menu Listing

Dolby® CP650 Digital Cinema Processor User’s Manual
iv
List of Figures
Figure 2-1 CP650 Front Panel ..................................................................................................... 2-1
Figure 2-2 Front-Panel Display Showing All Possible Channels Active .................................... 2-2
Figure 2-3 Front-Panel Display Showing Dolby Digital Film Playing ....................................... 2-3
Figure 2-4 Front-Panel Display Showing Dolby Digital Surround EX Film Playing................. 2-3
Figure 2-5 Front-Panel Display when Running Earlier Software................................................ 2-3
Figure 2-6 CP650 Setup Menu Control Buttons.......................................................................... 2-5
Figure 3-1 Digital/Analog Track Wear........................................................................................ 3-5
Figure C-1 Film Sound Track Layout..........................................................................................C-1
Figure C-2 Identifying Types of Film Sound Tracks ..................................................................C-2
Figure C-3 Surround Speaker/Amplifier Switching for 5.1-Channel..........................................C-3
Figure C-4 Surround Speaker/Amplifier Switching for Dolby Digital Surround EX .................C-3
Figure C-5 Cat. No. 69T Dolby Tone Test Film .........................................................................C-4

Virtual Dolby Technologies Test DVD Track List
iv

Dolby® CP650 Digital Cinema Processor User’s Manual
1-1
Chapter 1
Introduction
The Dolby®CP650 Digital Cinema 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 simple to operate.
Software that can be readily programmed controls all existing film sound formats.
Calibration settings for a given theatre can be stored on a PC and, if necessary,
transferred directly to another CP650, reducing or eliminating the need for
recalibration after repairs. As improvements to the CP650’s digital control and
processing software are developed, the latest revisions can be downloaded from a PC
to the CP650 hardware. Moreover, updates to the audio coding used for Dolby Digital
soundtracks, which are included from time to time right on Dolby Digital release
prints, download automatically into the CP650 the first time such a print is played in
the cinema.
The CP650 was installed and adjusted initially by a trained engineer so that your
theatre would have the same standard playback characteristics as the dubbing theatres
in which all Dolby films are mixed. This results in the most accurate sound
reproduction possible. Do not attempt to adjust any controls within the CP650 except
those specified in this manual. Adjusting internal controls requires special test
equipment. Tampering with these controls can have an adverse effect on the sound in
your theatre and will require a service call to restore proper operation. The first thing
to do when you have a problem is to read Chapter 4.
In addition, do not adjust any of the preset controls on the other audio equipment in
your theatre sound system. Misadjusting the power amplifier gain controls, for
example, can cause channel imbalance and too much power amplifier noise. Those
controls have been set by the installer for correct channel balance. The play level
should be correct in the theatre with the front-panel fader reading 7.0.

Dolby® CP650 Digital Cinema Processor User’s Manual Introduction
1-2
1.1 About This Manual
This user’s manual has been prepared specifically to help projectionists get the most
from the CP650 and the theatre sound system once it has been installed and aligned.
(Installation and alignment instructions are supplied to the local distributor or
installation company.) We suggest that you keep this manual readily available.
Following this introductory chapter, the manual is organized as follows:
•Chapter 2 covers the basic control functions and operation of the CP650.
•Chapter 3 contains tips for maintaining the CP650 and the theatre sound system.
•Chapter 4 will help you track down problems in the sound system without test
equipment. It consists of a troubleshooting chart and procedures to follow during
a show, between shows, and after closing.
•The appendices contain important additional information to help you get the most
out of the CP650 and your theatre sound system.

Dolby® CP650 Digital Cinema Processor User’s Manual
2-1
Chapter 2
Operating Instructions
2.1 The CP650 Front Panel
menu mute P1 P2
Level Display
Displays fader setting. Ranges from
0.0 to 10. Normally set to 7.0.
Projector Signal Indicators
P1 and P2 show which projector's
output is being processed by the
CP650.
Bypass Power Supply
Failure Indicator
Indicates a problem detected in the bypass
power supply.
Front Panel Display
Displays current format and processor
condition.
Setup Control Panel
Access Door
For use by the service engineer.
Bypass Power Button
When this button is illuminated red, the unit is in
bypass mode, either because bypass mode has
been manually selected (by using the button) or
because the main power supply has developed a
fault. In bypass mode, the unit is powered by the
built-in bypass power supply. While the main
power supply is in use, this button is not
illuminated, and the screen and other indicators
operate normally.
Main Fader Knob
Controls sound level and is used for
menu operations during setup.
OK Button
Stores the setting
displayed in the
CP650 memory.
Mute Button
Fades down and fades up the signal
to all channels without disturbing the
current main fader setting. Flashes
red when activated to fade down.
Select Button
Selects a menu parameter to
change. Make the change by
rotating the main fader knob.
Next Menu Button
Steps through the
menu list.
Format 10
Dolby Digital
L M1 0
Format Buttons
Used to select the format:
01
04 Dolby A-Type
05 Dolby SR
10 Dolby Digital
11 External 6 channel in (
U1
U2 U during setup
NS Nonsync 1
Mono (user-definable)
(user-definable)
user-definable)
Nonsync 1 Pro Logic (user-definable)
ser-definable
(user-definable)
Figure 2-1 CP650 Front Panel

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-2
2.1.1 Front-Panel Display
Day-to-day operation of the CP650 is performed through interaction with the display
in Figure 2-2.
L Le C Re R Rs Bsr Bsl Ls SW
Figure 2-2 Front-Panel Display Showing All Possible Channels Active
Figure 2-2 shows the display that is active when the CP650 is processing and playing
a digital signal connected to the CP650 input with all channels active. The top two
lines display the current format, which in this case is Dolby®Digital Surround EXTM
with five screen channels active. The bottom left area contains an active bar graph
display of the sound signals present on each channel. The bars move, confirming that
audio is passing through the CP650.
The bars are displayed starting with the Left screen channel, and moving clockwise
around the auditorium: Left screen, Left Extra screen, Center screen, Right Extra
screen, Right screen, Right Surround, Back Surround Right, Back Surround Left, Left
Surround, Subwoofer.
The Lon the display indicates that fader control is set to Local, meaning that the
fader knob on the front panel of the CP650 (and any Dolby remote-box fader knob)
controls the sound level in the auditorium. If the display shows an A, an external
auditorium fader knob (not manufactured by Dolby) controls the sound level.
An M1 on the display indicates that, in two-projector installations, the projector 1
motor contact is closed. In single-projector installations the front-panel display will
always show as M1. The motor start signal is used during projector changeovers on
Dolby Digital films in two-projector installations.
The 0shown on the bottom right is the Dolby Digital film error rate. The first
indication of satisfactory digital soundtrack playback is the detection of a low error
rate. The error rate is a number between 0 and 8. With a correctly aligned digital film
reader, most films will play at an error rate of 6 or lower. If the digital error rate
exceeds 8, or if the display shows F(data not readable) or “–”(no digital soundtrack),
the CP650 automatically switches to playing the film’s analog soundtrack until usable
data appears.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-3
Other Possible Front-Panel Sound Format Displays
L C R Rs Ls SW
Figure 2-3 Front-Panel Display Showing Dolby Digital Film Playing
Figure 2-3 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.
L C R Rs Bsr Bsl Ls SW
Figure 2-4 Front-Panel Display Showing Dolby Digital Surround EX Film Playing
Figure 2-4 shows the display when the CP650 is equipped with a Dolby Digital
Surround EX decoder board, and playing a Dolby Digital Surround EX soundtrack.
The additional Back Surround Left and Back Surround Right channels are present in
this configuration.
The digital sound data from current films produced with the Dolby Digital
Surround EX process contains auto-switching bits, or “Surround EX flags.” A CP650
equipped with the Cat. No. 790 Surround EX board detects these bits and switches the
additional back surround channels on as shown. If the flags indicate that the film is
not a Surround EX film, or if the flag bits are not present, Auto Surround EX mode is
switched off, and the display will show equal levels for the Rs/Bsr and Bsl/Ls
channels.
Front-Panel Sound Format Display on Units with Earlier Software
The bar graph display on CP650s running software earlier than version 2.1 is slightly
different. See Figure 2-5.
Dolby Digital Surround EX board installed: Not installed:
L C R Ls Rs SW Bsl Bsr L C R Ls Rs SW
Figure 2-5 Front-Panel Display when Running Earlier Software

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-4
2.1.2 Level Display
The main fader level is displayed as a two-digit number. Starting at 0.0, the level
increases as the fader knob is rotated clockwise. As with previous generations of
Dolby cinema processors, a fader setting of 7.0 is the correct operating level. This
setting matches the level used during production of the film.
2.1.3 Main Fader Knob
Use the main fader knob to adjust the sound level. As the main fader is turned, the
numbers on the display move from 0.0 to 10. A fader reading of 7.0 is the correct
operating level. The main fader knob rotates continuously with no end stops. The
knob is also used to choose various menu items during setup operations.
2.1.4 Projector Signal Indicators
P1 and P2 show which projector analog optical sound input has been selected by the
CP650.
2.1.5 Bypass Power Supply Failure Indicator
The bypass power supply failure indicator turns on if a problem is detected in the
bypass power supply circuitry.
2.1.6 Bypass Power Button
The bypass 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. It also glows red if a fault is detected during normal operation
(power button in the ONposition), indicating that the unit has automatically switched
to bypass operation.
2.1.7 Format Buttons
The following format buttons are used to select the desired film sound format:
•01—Mono.
•04—Dolby A-type.
•05—Dolby SR.
•10—Dolby Digital.
•11—External six-channel input signal.
•U1, U2—Set by the user.
•NS—Nonsync, for intermission music CD, tape, and so on. It is usually set as
format 60, but it can be set to other formats.
Any available format can be assigned to the 01, 04, 11, U1, U2, or NS buttons. See
Section 2.2.8.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-5
2.1.8 Setup Control-Panel Access Door
The setup control-panel access door is for use only by the service or installation
engineer.
2.1.9 Mute Button
Press the mute button to fade down the sound on all channels without disturbing the
current fader setting. The speed of fade-in/fade-out is adjustable from 0.2 to 5
seconds. The button flashes red when mute is activated.
2.1.10 Menu Control Buttons
Use the menu control buttons to navigate through the various menus displayed on the
front-panel screen, select various menu options, and store setup data.
menu
OK
Figure 2-6 CP650 Setup Menu Control Buttons
Use the left-hand button to step through the menu list. Press and release the button
once to change the display to the next menu item. Press and hold the button while
rotating the main fader knob to step the display through all menu items.
Press and release the center button to choose a parameter to adjust when there are
multiple items available on the display. Rotate the main fader knob to change or adjust
the chosen parameter.
Use the right-hand button to accept the setting displayed on the front-panel screen and
store it in CP650 memory. Any changes to settings occur immediately but are not
saved until this button is pressed. Leaving the current menu before pressing the OK
button discards the change.
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® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-6
System V.2.x.x.x
Loading.........
........
Running self test
Checking video level
Checking 6 ch. input
Checking opt in:P1
2.2 Normal Operation
This section describes the normal operation of the CP650. Section 2.3 describes
operation when the CP650 has switched to emergency bypass.
2.2.1 Power On
Each time the CP650 is connected to power, it automatically sets itself to the selected
wake-up state. During the CP650 installation, the power-on state of the unit was
configured from the following choices:
•Projector 1 or 2 (selected by the installation technician).
•The last fader setting before shutdown. (If the front-panel fader was active, the
system will start up at the last fader setting before power was turned off. If the
auditorium fader was active, the system will read the setting of the auditorium
fader knob.)
•Either the film sound format that was active when power was turned off or the
film sound format previously stored as the power-on format. (The format options
can be set using the procedure described Section 2.2.10.)
If power has been removed for longer than approximately three weeks, the CP650
wake-up state is:
•Front-panel main fader activated and set to 7.0
•Format 10 (Dolby Digital)
•Power-on format set to the last format used before power was turned off
When power is first applied, the first screen shows that the
software is loading into the CP650 memory, and displays
the software version number.
Next, a brief self-test of various internal circuitry is
automatically performed.
Finally, the normal operating screen appears. Details on the
items displayed are described earlier in this chapter. This is
the only screen you will need to see for ordinary operation.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-7
Format Selection
Select the desired film soundtrack format or your nonsync source by pressing the
appropriate front-panel button. The button illuminates and the format number appears
on the screen to confirm that the format was selected. Common formats are:
•01 Mono—For all optical prints of any vintage with conventional mono optical
(Academy) soundtracks.
•04 Dolby A-type—For Dolby releases, except those marked SR or Digital.
•05 Dolby SR—For releases marked as having a Dolby SR (Spectral Recording)
soundtrack or for Dolby Digital prints if your CP650 is not equipped with digital
playback capability.
•10 Dolby Digital—For Dolby Digital film releases. The digital data is clearly
visible between the film perforations next to the analog soundtrack. (Your CP650
must be equipped with a Cat. No. 773 board.)
•11 External 6ch—For selecting an external six-channel analog sound source.
•13 Dolby Digital Surround EX.
•NS nonsync—Usually format 60. For playing an intermission music tape or CD.
The film-soundtrack format numbers used on the CP650 buttons (and also on models
CP45, CP65, and CP500) often appear on the film can and leader. If these numbers
are not supplied and you are not sure if a print is mono, stereo optical, or digital, see
Appendix C, which explains how to identify the various types of soundtracks.
2.2.2 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 film encoded with Dolby technologies.
Although a minor adjustment in playback level might be required under unusual
circumstances, avoid significant deviations from the correct level (7.0) established by
the installer. If the playback level is set too low, dialogue may be hard to understand;
too high a level may cause complaints from the audience, and under extreme
circumstances, can damage the theatre’s sound system.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-8
Fader Setting
Main Fader
Fader Setting
Auditorium
Preset Fader Levels
>Format xx
Fader: xx.x
Preset Fader Levels
Format xx
>Fader: xx.x
2.2.3 Auditorium Fader
If an analog auditorium fader pot (not a Dolby Cat. No. 779 Digital Remote Unit or
Cat. No. 771 Remote Fader) has been installed, it is activated by performing the
following menu steps:
1. Press multiple times, or press and hold the button while
rotating the front-panel knob to move to the Fader Setting
screen.
2. Rotate the fader knob to select Auditorium.
3. Press OK to save the change.
4. Press the illuminated format button to return to normal operation.
To return control to the main fader or digital remote faders, repeat steps 1–4 and
select Local on the fader setting menu.
2.2.4 Assigning Preset Fader Levels
Preset levels can be assigned to each front-panel format button.
1. Press to move to the Preset Fader Levels menu,
then rotate the front-panel knob to select the front-panel
button you wish to preset (01, 04, 05, 10, 11, U1, U2, or NS).
2. Press to move the selection to Fader, then rotate the
front-panel knob to the desired level setting for this
button (1–10).
3. Press OK to save the preset for this button.
4. Repeat the steps above to set the preset fader levels desired for other buttons and save
the changes.
5. Press the illuminated format button to return to normal CP650 operation.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-9
Auto Dolby Digital
>Enabled
Auto Dolby Digital
>Disabled
2.2.5 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. CP650s are shipped from the factory with this feature
enabled.
Auto Dolby Digital can only be sensed from an analog film source format. The
format 10 button location can be thought of as the target for Auto Dolby Digital.
Note: There may be more than one format 10 button location. In addition to button
10, format 10 may also be assigned to any of the six user-assignable buttons—01, 04,
11, U1, U2, NS. Buttons 05 (Dolby SR) and 10 (Dolby Digital) are not user assignable.
More than one button can be assigned as format 10 in order to use the fader preset
feature available for each button. Some users assign one button as format 10 for
trailers and another format 10 button for the feature film, with each button preset to
the desired fader level.
If an analog soundtrack film is playing on a button that is assigned to either format 01
(Mono), format 04 (Dolby A-type), or format 05 (Dolby SR) and a Dolby Digital
soundtrack is sensed, the CP650 will switch to the format 10 (Dolby Digital) target
button. The format 10 target button is assigned in one of the menus.
The Auto Dolby Digital feature is disabled whenever a front-panel button is pressed
or an automation cue is received after Auto Dolby Digital has operated. This action is
useful, for example, if you wish to quickly select an analog film format during the
show.
The NS button reenables the Auto Dolby Digital feature. We recommend that the NS
button be assigned to your intermission format (typically format 60, 75, or 80),
because at the end of the film, when the NS format button is typically used, the Auto
Dolby Digital feature is then reenabled.
To disable (or reenable) the Auto Dolby Digital feature, follow these steps:
1. Press multiple times, or press and hold the button while
rotating the front-panel knob to move to the Auto Dolby
Digital screen.
2. Rotate the fader knob to select Disabled.
3. Press OK to save the change.
4. Press the illuminated format button to return to normal operation.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-10
Auto Digital Target
Auto Digital Target
>Format 10
Dolby Digital
Rotating Noise
Press OK to
Start or Stop
CAUTION
Pressing OK will play
pink noise in the
auditoriu
m
Rotating Noise
Press OK to
Start or Stop
Runnin
g
L
2.2.6 Setting the Auto Dolby Digital Target
This menu item allows you to select which format button will activate when a Dolby
Digital film is detected automatically. If you have assigned the Dolby Digital format
to multiple buttons, choose the button you wish to use.
1. Press multiple times, or press and hold the button while
rotating the front-panel knob to move to the Auto Digital
Target screen.
2. Rotate the fader knob to select among the format buttons that
have Dolby Digital assigned to them.
3. Press OK to save the change.
4. Press the illuminated format button to return to normal operation.
2.2.7 Quick Sound Check—Rotating Pink Noise
Use the rotating pink noise function as a fast method to check the overall sound
quality in your theatre.
1. Press multiple times, or press and hold the button while
rotating the front-panel knob to move to the Rotating Noise
screen.
2. A warning message appears. Press OK to start the pink noise.
Pink noise is sent to each channel in turn, holding for five
seconds at each channel. The channel currently running pink
noise is shown on the bottom right-hand side of the display.
Pressing OK stops the pink noise from moving to the next channel. Pressing OK again
resumes pink-noise rotation.
3. Go to the auditorium and sit two-thirds of the distance from the front speakers to the
rear, and at the center from side to side. All channels should sound equally loud and
have a similar sound as the noise rotates. Call your service engineer if you hear a
problem.
4. Press the illuminated format button to return to normal operation.

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-11
Button 01 Format
> Format xx
format name
Button 01 Format
>Format 80
Master Digital In
Button U2 Format
>Format 65
Public Address LsRs
2.2.8 Assigning Front-Panel Buttons to Formats
Any available format can be assigned to the front-panel 01, 04, 11, U1, U2, or NS
buttons. When the button is pressed, that format will be selected.
1. Pressing steps through the button selections, 01, 04,
11, U1, U2, and NS.
2. Rotate the fader knob to select one of the many format
choices available. This example shows Format 80
assigned to Button 01.
3. Press OK to save the assignment to this button.
4. Press to step to the other button choices, then rotate the
fader knob again to select the desired format.
5. Press OK to save the assignment to this button, and so on.
6. Press the illuminated format button to return to normal CP650 operation.
2.2.9 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. This function 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.
When you press mute, the volume automatically fades all the way down on all
channels. The button will flash, indicating that the CP650 outputs are muted. When
you press the button again, or select a new format, the volume automatically rises to
the level set by the fader.
The fade-out and fade-in time can be set to work from 0.2 to 5 seconds by following
this procedure:
1. Press , or press and hold the button while rotating the
front-panel knob to move to the Mute Fade-in Time menu.
2. Set the desired fade-in time using the front-panel knob.
3. Press OK to save your setting.
4. Press to set the Mute Fade-out Time using the same procedure.
5. Press the illuminated format button to return to normal operation.
Mute Fade-in Time
>x.x Seconds

Dolby® CP650 Digital Cinema Processor User’s Manual Operating Instructions
2-12
Power On Format
Contrast Adjustment
> 10
2.2.10 Selecting the Power-On Format
Each time the CP650 is connected to power, it automatically sets itself to the selected
power-on format. Use this menu item to store a specific power-on format or to select
the format that was active when power was turned off.
1. Press to move to the Power On Format Select menu,
then rotate the front-panel knob to select which format button
will be active at power-on.
2. Press OK to save your changes.
3. Press the illuminated format button to return to normal CP650 operation.
2.2.11 Setting the Front-Panel Display Contrast
The liquid crystal display (LCD) contrast can be adjusted to give the clearest possible
readability.
1. Press to move to the Contrast Adjustment menu, then
rotate the front-panel knob while watching the display. Adjust
for the most pleasing appearance. This example shows the
contrast set to 10.
2. Press OK to save your changes.
3. Press the illuminated format button to return to normal CP650 operation.
2.2.12 Operation with an Automation System
When the CP650 in your theatre is connected to automation equipment, the format
selection is duplicated elsewhere. Usually, the front-panel buttons of the CP650 can
be used to override commands from the automation system; however, as automation
equipment differs from installation to installation, check with your system installer if
you have any questions about overriding the automation commands.