Dolby Laboratories CP500 Quick start guide

!Information
Issue 02
Part No. 91497
S98/11512/12084
Dolby Laboratories Inc.
U.S.A. 100 Potrero Avenue •San Francisco, CA 94103 •Telephone [phone] •Facsimile 415-863-1373 •Web: www.dolby.com
U.K. Wootton Bassett •Wiltshire SN4 8QJ •England •Telephone [phone]•Facsimile [phone]
Dolby and the Double-D symbol are trademarks of Dolby Laboratories © 1997 Dolby Laboratories Inc.
Model CP500 Cinema Processor
Reference Diagrams
Grounding Details
Installation Wiring
Connector Pin Assignments
System Block Diagram
Card Locations and Signal Flow
Menu Structure

Proper Grounding of Equipment
(For non-EC countries only)
In the past it was assumed that if the units were mounted in the same rack that they would
be bonded together by way of the rack rails to the mounting ears. The paint used on
professional products has gotten much better in the last few years and this assumption is
generally no longer true. To ensure a good ground connection between units in the rack
and therefore a quiet system with no hum or noise it is highly recommended installing at
least one star washer for every piece of equipment. Insulating nylon or plastic washers
on the rack screws should not be used with the star washer. See figure below:
To optimize the grounding of the system you must add a jumper between signal ground
of the CP500 and the chassis. See figure below:
Connection of ground jumper and amplifier

Most projectors sold in North America come with the new reverse scan LED analog
soundhead readers installed. In addition, many existing projectors are being upgraded to
include this superior method of playing back SVA soundtracks. The output of the solar
cell from this system is at a somewhat lower level than a normal incandescent exciter
lamp solar cell. In order to provide the correct signal level for the cinema processor a
small preamp board is needed and is mounted in the soundhead.
Since this is an active circuit it must have its signal ground connected to the cinema
processor ground for correct operation. Failure to connect the board ground to the
cinema processor can result in a noisy optical system or no sound at all. In some
instances the signal ground from the board has been connected to the ground of the
projector; this method should be avoided as it is not the best way to make this connection
The preferred way is to connect the shield at both ends of the signal path. See figure
below:
Proper connection of Reverse Scan
LED Readers to Cinema Processor

APPENDIX C
BACKPLANE CONNECTORS / REFERENCE DIAGRAMS
CP500 Backplane Connector Pin Assignments
1. Automation Connector:
Pin
Number Function
1 SK1 Format Select Input
2 SK2 Format Select Input
3 SK3 Format Select Input
4 SK4 Format Select Input
5 SK5 Format Select Input
6 SK6 Format Select Input
7 SK7 Format Select Input
8 SK8 Format Select Input/or
STEP (in Automation Sequential mode)
9 Mute On/Off Input
18 Format Status Bit 0
19 Format Status Bit 1
20 Format Status Bit 2
25 Projector Status Output
12 Signal Ground
2. Serial Data Connector:
Pin
Number Signal Name
1N/C
2 Transmitted Data
3 Received Data
4 Looped back to pin 6
5 Signal Ground
6 Looped back to pin 4
7 Looped back to pin 8
8 Looped back to pin 7
9N/C
3. Motor Start Connector:
Pin
Number Signal Name
1 Motor Start Relay, Proj 1
2 Proj 1 Changeover, pulsed contacts
3 Changeover relay, closed selects Proj 2
4 Proj 2 Changeover, pulsed contacts
5 Ground
6N/C
7N/C
8N/C
9 Motor Start Relay, Proj 2

C-2
4. Bypass / Remote Connector:
Pin
Number Signal Name
1 Bypass Power Transformer Connection, 16-18 Vac
2 Bypass Power Transformer Connection, 16-18 Vac
3 Remote Control Unit V+
4 Remote Control Unit Data
5 Remote Control Unit Ground
6 Remote Auditorium Fader +
7 Remote Auditorium Fader Ground
8N/C
5. Main / LF Output Connector:
Pin
Number Signal Name
1 Left Channel
2 Signal Ground
3 Right Channel
4 Signal Ground
5 Center Channel
6 Signal Ground
7 Left Surround Channel
8 Signal Ground
9 Right Surround Channel
10 Signal Ground
11 Sub Woofer Channel
12 Signal Ground
13 Hearing Impaired Channel
14 Signal Ground
15 Mono Surround Channel
6. Crossover Output Connector (Used With Cat. No. 683 Installed):
Pin
Number Signal Name
1 Left Channel HF
2 Signal Ground
3 Right Channel HF
4 Signal Ground
5 Center ChannelHF
6 Signal Ground
7 Left Surround Channel LF
8 Signal Ground
9 Right Surround Channel LF
10 Signal Ground

C-3
7. Optical 1 Input Connector:
Pin
Number Signal Name
1 Projector 1 Left Channel +
2 Projector 1 Left Channel -
3 Signal Ground
4 Projector 1 Right Channel +
5 Projector 1 Right Channel -
6 Signal Ground
7N/C
8N/C
9 Signal Ground
8. Optical 2 Input Connector:
Pin
Number Signal Name
1 Projector 2 Left Channel +
2 Projector 2 Left Channel -
3 Signal Ground
4 Projector 2 Right Channel +
5 Projector 2 Right Channel -
6 Signal Ground
7N/C
8N/C
9 Signal Ground
9. Mic. Input Connector:
Pin
Number Signal Name
1Mic1+
2Mic1-
3 Mic2 signal
4 Mic2 ground
5N/C
6 Mic1 ground
7 Mic Multiplexer V+
8 Mic Multiplexer Gnd
9 Mic Multiplexer Data

C-4
10. Accessory Rack Analog Connector:
Pin
Number Signal Name Signal Description
1 AccOptByp Mono input to Cat 682 for Bypass
Operation
2 X15 Direct Input to Cat 682
3 X14 Direct Input to Cat 682
4 X13 Direct Input to Cat 682
5 X12 Direct Input to Cat 682
6 X11 Direct Input to Cat 682
7 X10 Direct Input to Cat 682
8 AccSW Ouput to Acc Rack from Cat 662
9 AccC Ouput to Acc Rack from Cat 662
10 AccRS Ouput to Acc Rack from Cat 662
11 AccLS Ouput to Acc Rack from Cat 662
12 AccR Ouput to Acc Rack from Cat 662
13 AccL Ouput to Acc Rack from Cat 662
14 AccNRS Input to noise reduction resources*
15 AccNRC Input to noise reduction resources*
16 AccNRRe Input to noise reduction resources*
17 AccNRLe Input to noise reduction resources*
18 AccNRR Input to noise reduction resources*
19 AccNRL Input to noise reduction resources*
20 Ground Signal Ground
21 Ground Signal Ground
22 Ground Signal Ground
23 Ground Signal Ground
24 Ground Signal Ground
25 Ground Signal Ground
26 Ground Signal Ground
27 Ground Signal Ground
28 Ground Signal Ground
29 Ground Signal Ground
30 +13VDC Power Supply
31 +13VDC Power Supply
32 -12VDC Power Supply
33 -12VDC Power Supply
34 Ground Signal Ground
35 OPTBUSSR Optical Pre Amp Output Right
Channel
36 Ground Signal Ground
37 OPTBUSSL Optical Pre Amp Output Left Channel
*Dolby Level is 388 mV.

C-5
11. Accessory Rack Digital Connector:
Pin
Number Signal Name Signal Description
1 Signal
Ground Signal Ground
2 OPTLRCK Left / Right Clock from Optical A/D
3 RETSD2 Serial Data 2 Return
4 RETSD1 Serial Data 1 Return
5 RETSD0 Serial Data 0 Return
6 RETWCK Word Clock Return
7 RETBCK Serial Bit Clock Return
8 ACCBAUD Baud Rate Clock
9 ACCLINK Accessory Rack Present
10 RET256FS 256 X Sample Rate Clock Return
11 ACCRXD Accessory Rack Received Data
12 ACCTXD Accessory Rack Trasmitted Data
13 Signal
Ground Signal Ground
14 OPTBCK A/D Bit Clock form Optical A/D
15 OPTDAT Serial Data from Optical A/D
16 RETOPTD
AT1 Spare Data Line 1
17 RETOPTD
AT2 Spare Data Line 2
18 !ACCEN Enable Accessory Rack
19 ACCSD2 Accessory Rack Serial Data 2
20 ACCWCK Accessory Rack Word Clock
21 ACCBCK Accessory Rack Bit Clock
22 ACCSD1 Accessory Rack Serial Data 1
23 ACC256FS Accessory Rack 256 X Sample Rate
Clock
24 ACCSD0 Accessory Rack Serial Data 0
25 ACC512FS Accessory Rack 512 X Sample Rate
Clock