Dolby CP650 791 Digital Crossover, CP650 Digital Cinema Processor, 790 Digital Surround EX Decoder, 774A System Controller Board, 772A Analog Board Installation Instructions

UXO/650 Upgrade Kit
Cat. No. 791 Digital Crossover
For CP650 Cinema Processor
Installation Instructions
Issue 2
Part No. 91833
Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
Dolby Laboratories, Inc.
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Dolby Laboratories, Inc.
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Telephone (44) 1793-842100
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 2003 Dolby Laboratories, Inc. All rights reserved.
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Part Number. 91833
Issue 2
S03/14410/14706
Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
1
Introduction
The Cat. No. 791 Digital Crossover Board adds two- or three-way screen-channel
crossover capability to a Dolby® CP650 Digital Cinema Processor. If the crossover is
operated in two-way mode, the CP650 can support installations with five screen
channels (Left Extra, or Le, and Right Extra, or Re).
To use this optional board, your CP650 must be equipped with a Cat. No. 790 Dolby
Digital Surround EXTM Decoder/Digital Input Board, which provides the required
mounting connectors.
Other CP650 boards required are:
• Cat. No. 774A System Controller Board
• Cat. No. 772A Analog Board
The non-A versions of these boards do not operate properly with the Cat. No. 791
installed.
The upgrade kit consists of:
• A Cat. No. 791 Digital Crossover Board
• Mounting hardware
Check CP650 Software Version
The CP650 operating system software must be version 2.1 or newer. With the CP650
operating normally, follow these steps:
Press the left menu button multiple times until
you reach 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 has three menu screens.
About this CP650:
System v.2.1.x.x
Cat.No.xyz installed
Cat.No.xyz installed
The first screen displays the version number of the
installed operating system software. If the version
reads “2.0.x.x” (x = any number) or earlier, you
must update the operating system software to
version 2.1.x.x or newer.
Press the illuminated format button to return to the
top menu screen.
3
Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
2
Handling PC Boards
This upgrade involves handling printed circuit boards. Many components are very
sensitive to static electricity and can be destroyed if static charge on your body
discharges through the component. You do not even have to touch the component to
damage it. Before touching the components on the PC boards, ground yourself by
rubbing the frame of the unit with each hand or wearing an earthing strap.
3
Installation Steps
1. Remove mains power from the CP650 by unplugging the rear-panel power cord.
2. Open the setup control panel access door.
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
Figure 1 Setup Control Panel
3. Remove the front-panel mounting screw located in the upper right-hand corner of
the setup control panel and carefully pull the front panel toward you to remove it.
4
Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
Ca
t. N
o.
79
Ca
1
t. N
o.
79
0
Ca
t. N
o.
77
4A
Ca
t. N
o.
77
2A
Ca
t. N
o.
77
3
Figure 2 Remove Subpanel
4. Remove the seven subpanel mounting screws and carefully pull the subpanel
toward you to remove it. Be sure to support the panel while you perform the
next step.
5. Unplug the ribbon cables connected to the internal circuit boards.
6. Remove the upper circuit board (Cat. No. 774A) using the left and right board
ejectors. Place the board on a flat surface (such as a platter disk). The board
should be oriented with the ejectors closest to you.
7. Set the two jumpers, located on the bottom board, Cat. No. 772A, to “yes.” Slide
the board partially out and set these jumpers as shown:
NO
YES
J2
C DOLBY LABORATORIES INC. MADE IN THE U.S.A.
Jumpers
Cat. No. 791 Crossover Board Present?
J1
MAIN
Cat. No. 772A
MIC LEVEL
HF
YES
NO
BYPASS LEVELS
Figure 3 Cat. No. 772A Board Jumpers
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Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
Standoff
Locations for
Cat. No. 791
8. If your CP650 is already equipped with a Cat. No. 790 board, remove the four
screws that attach it to the Cat. No. 774A board, then unplug the Cat. No. 790.
Cat. No. 790
Dolby Digital
Surround EX
Board
Location of
Cat. No. 773
Board
Cat. No. 774A
Figure 4 Standoff Locations for mounting the Cat. No. 791
9. Attach the four supplied standoffs to the Cat. No. 790 board using four of the
eight screws supplied. Use the four holes that are closest to the middle of the
board.
10. Reinstall the Cat. No. 790 board by aligning the two connectors as shown in
Figure 4. Press down firmly on each side, making sure the connectors are fully
seated. The board can be oriented only one way for the connectors to match.
11. Reinstall the four screws that secure the Cat. No. 790 board to the Cat. No. 774A
board.
6
Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
12. Remove the Cat. No. 791 Digital Crossover Board from its anti-static bag. The
board contains a circuit in each high-frequency output channel (Left high, Right
high, and Center high) to boost high frequencies. This allows the outputs to
overcome the loss caused by placing the high-frequency drivers behind a
perforated theatre screen. The circuit adds a maximum of 8 dB boost, starting at
approximately 6 kHz. This boost, combined with the bulk treble and equalization
adjustments, provides enough high-frequency gain to suit most applications. Since
not all applications require this boost, jumpers are provided on the board to enable
or disable it. The jumpers are preset at the factory to the disable setting.
Cat. No. 791
Screen Loss
Filter Jumpers
LEFT
RIGHT
DISABLE
J2
J3
ENABLE
CENTER
J5
Figure 5 Cat. No. 791 Board Jumpers for Screen Loss HF Boost
13. Plug the board into the two connectors on the top of the Cat. No. 790. Press down
firmly on each side, making sure the connectors are fully seated. The board can be
oriented only one way for the connectors to match. Install the four supplied
screws to secure the Cat. No. 791 board.
Cat. No. 790 / 791
Dolby Digital
Surround EX /
Digital Crossover
Boards
Cat. No. 773
Dolby Digital
Decoder Board
Cat. No. 774A
Figure 6 Installed Cat. No. 791 Board
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Dolby® Cat. No. 791 Crossover Upgrade Kit Installation Instructions
14. Reinstall the assembly into the CP650. Push the board in firmly.
15. Reinstall the two ribbon cables, inner panel, and front panel.
4
Connections and Alignment
With the Cat. No. 791 board installed, the CP650 outputs to the mid- and highfrequency channels appear at the Option I/O connector on the rear panel of the
CP650. The low-frequency output channels appear on the Main Audio Output
connector.
If you wish to use the Le and Re channels, the crossover must be configured to TwoWay mode, and the Le and Re channels are available on the left mid and right mid
output channels, respectively.
See the CP650 Installation Manual, issue 4 or higher, for connection details and
crossover setup steps.
Table 1 Option Card I/O Connector Pinout with Cat. Nos. 790 and 791 Installed
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
Signal with
Cat. No. 790 Installed
S/PDIF 1 (L/R) Input +
S/PDIF 2 (C/SW) Input +
Back Surround Left –
n.c.*
n.c.
Back Surround Right –
Chassis Gnd (for digital
inputs)
See Note
n.c.
n.c.
Left Surround –
Right Surround –
n.c.
S/PDIF 3 (Ls/Rs) Input +
n.c.
n.c.
Back Surround Left +
n.c.
n.c.
Back Surround Right +
n.c.
S/PDIF 4 (Bsl/Bsr) Input +
n.c.
Left Surround +
Right Surround +
n.c.
Additional Outputs with
Cat. No. 791 Crossover Installed
Center mid +
Center high +
Right high +
Right mid + [Right Extra +**]
Left high –
Left mid + [Left Extra +**]
Left mid – [Left Extra –**]
Center high –
Center mid –
Right high –
Right mid – [Right Extra –**]
Left high +
* No connection.
** Available only when system is configured as a two-way crossover and Le/Re mode is enabled.
Note: The screen (shield) of all analog output connections must be
connected to the shell of the D-connector.
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