Dolby Laboratories CP650 Installation Manual Page 71
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Dolby
®
CP650 Installation Manual
5-1
Chapter 5
A-Chain Alignment
Note: CP650DC models for digital cinemas do not incorporate 35 mm film sound
support. Skip this chapter if you are installing any of these models.
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.
The A-chain optical level is calibrated with the Cat. No. 69T Dolby Tone test film.
This film is used to establish the correct Dolby operating level within the CP650.
A Cat. No. 69P pink-noise test film is used for A-chain frequency response and
soundhead alignment. Pink noise has a constant amount of energy per 1/3-octave
band, creating a flat response on a real-time analyzer display.
The optical slit is the key element in the A-chain because it imposes the initial
limitation on the high-frequency response of the system. Light from the exciter lamp
passes through the optical slit and is focused on the optical soundtracks on the film.
The light that passes through the soundtracks falls on the stereo solar cell, which
generates an electrical signal proportional to the audio signal recorded on the optical
soundtracks. The slit introduces high-frequency loss, which must be compensated by
circuitry in the CP650.
The slit image must be correctly focused on the film and must be set at precisely a
right angle to the direction of film movement in order to maintain the correct phase
relationships between the two optical tracks. Any azimuth error will show as a loss of
high frequency in the front channels and potentially excessive crosstalk in the
surround channels.
Each channel in the CP650 optical preamplifier is equipped with a slit-loss equalizer
control. Adjustment of this control shifts a fixed amount of boost upward or
downward in frequency, but the shape of the curve remains constant. A flat response
to 16 kHz can be achieved.
- Digital Cinema Processor 1
- Installation Manual 1
- Dolby Laboratories, Inc 2
- Table of Contents 3
- CP650 Installation Manual 4
- List of Figures 6
- List of Tables 7
- Regulatory Notices 8
- CP650 Installation Manual 11
- Chapter 1 13
- Introduction 13
- Dolby Digital 18
- Surround EX mode 18
- 1.4 Specifications 19
- 2.1 Check Main Fuse 21
- 2.3 Mount the CP650 22
- 2.5 Connect the CP650 23
- 2.5.2 Remote Controls 24
- 2.5.5 Digital Audio Sources 28
- For Cat.No. 778 29
- For Cat.No. 794 29
- CP650 INSTALLATION WIRING 33
- INPUT AND CONTROL CONNECTIONS 33
- AUDIO OUTPUT CONNECTIONS 35
- CP650DCXO INSTALLATION WIRING 38
- Chapter 3 41
- 3 1/3 db 45
- 3.2 The Setup Control Panel 47
- Chapter 4 51
- B-Chain Alignment 51
- 4.2 Microphone Placement 52
- 4.3 Initial Setup 53
- OK to save this setting 54
- Mic Level Too Low 55
- Proceeding 55
- Uncalibrated 55
- 4.5.1 Main Channels 56
- 4.5.2 Subwoofer Channel 57
- Cat. No. 791 58
- Screen Loss 58
- Filter Jumpers 58
- Crossover Mode 59
- >3 Way 59
- Le / Re Channels 59
- Disabled 59
- OK to save 62
- 4.7 Room Equalization 63
- 4.7.2 Setting Coarse EQ 64
- 4.7.3 Setting Fine EQ 65
- 4.7.4 The EQ Assist Feature 66
- Digital Subwoofer 68
- >Level: xx 68
- Polarity: Normal 68
- Center Noise: Off 68
- OK to save the selection 69
- 123 7456 8 70
- Chapter 5 71
- A-Chain Alignment 71
- 5.1 Projector Checkup 72
- 5.3 Dolby Level Set 74
- 5.3.2 Manual 75
- 5.5 Cell Alignment Check 76
- 5.6 Cell Wiring Check 77
- 5.7 Azimuth Check 77
- 5.8 Focus Check 78
- 5.9.1 Auto Slit-Loss EQ 79
- 5.9.2 Manual Slit-Loss EQ 79
- OK to save the settings 80
- Chapter 6 81
- Digital Soundheads 81
- 6.3 Focus Adjustment 82
- 6.4.1 Cat. No. 702 Reader 83
- 6.4.2 Cat. No. 701 Reader 84
- Chapter 7 85
- Final Adjustments 85
- OK to save the setting 86
- Digital Surround 88
- > xxx mSec 88
- 7.8 Mono Level Trim 92
- 7.9 Mono EQ Adjustment 92
- Front-Panel Buttons 92
- Button Presets 93
- Button 01 93
- Fader: 6.5 93
- >Delay: 0—170 mSec 93
- 7.13 Reversion Mode 94
- 7.15 Noise Gating 94
- 7.16.3 Fail Parameters 97
- L M1 0 99
- 7.17 Dialogue Normalization 100
- 7.18 Network Configuration 100
- 7.19 Clock Set 101
- 7.20 Date Set 101
- Chapter 8 103
- Accessories 103
- 8.1.1 Remove the Housing 104
- Top View 105
- 8.1.5 Assemble the Unit 106
- 8.1.6 Connect to the CP650 107
- Chapter 9 109
- 9.3 CP650 Troubleshooting 110
- Bypass Fuse 111
- 9.3.3 The Event Log 112
- 9.3.4 Troubleshooting Chart 112
- NO SOUND AT ALL 113
- NO SOUND IN SOME 114
- FORMATS 114
- FADER PROBLEMS 115
- CONTROL PROBLEMS 115
- RUMBLES, WHISTLES 116
- HUM IN SOUND 116
- TROUBLE IN ONE OR 117
- MORE CHANNELS 117
- CHANGEOVER AND 120
- CONTROL TROUBLES 120
- CP650 POWER SUPPLY WIRING 122
- CAT.NO.776-5 (GOLD COVER) 122
- CAT.NO.776-2 (GOLD COVER) 124
- Cat. No. 702 Exploded View 125
- Cat. No. 702 REAR VIEW 126
- F11504A_2.CDR 127
- Cat. No. 700 / 701 REAR VIEW 128
- Appendix A 129
- Software Operations 129
- A.2 Updating CP650 Software 130
- Appendix B 133
- Rear-Panel Connectors 133
- B.2 Input Connectors 136
- B.3 I/O Connectors 140
- Appendix C 143
- Format Descriptions 143
- C.2 Format Definitions 144
- Cat. No. 778 AES1 153
- Appendix D 155
- External Control 155
- Key Range of Values Notes 156
- Serial Data 157
- Remotes and Aud. Fader 158
- Appendix E 161
- Setup and User Menus 161
- + = 161
- = Bypass/Normal toggle 163
- (Cat. No. 778 only) 164
- E.2 CP650 User Menu 165
- DIP switch 6 Down 165
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