Dolby Laboratories CP650 Installation Manual Page 136
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Dolby
®
Model CP650 Troubleshooting Chart Maintenance and Troubleshooting
9-14
Symptom Probable Cause Recommended Action
The sound from two or more channels is
distorted and you can hear the distortion
through the booth monitor at normal
listening level.
Malfunctioning two-channel power amplifier.
If two distorted channels are served by the same two-
channel amplifier, the problem may be in the amplifier. See
the manufacturer's instructions.
Call service engineer.
When a stereo film is projected, the sound
appears to be coming from the wrong
speakers.
The A-chain has become misaligned.
Check Dolby level calibration.
Call service engineer.
Sound from the front (screen) channels is
leaking into the surround channel.
The A-chain has become misaligned.
Surround sound delay set improperly.
Surround sound level set too high.
Call service engineer.
Call service engineer.
Call service engineer.
You hear an echo in a small theatre. Surround sound delay set improperly. Call service engineer.
The sound level in bypass is higher or
lower than the normal sound level.
Adjust with the front-panel knob, since other parts of the
system may be malfunctioning.
Call service engineer.
- Model CP650 1
- Installation Manual 1
- Dolby Laboratories, Inc 2
- Table of Contents 3
- List of Figures 7
- List of Tables 9
- Chapter 1 13
- Introduction 13
- 1.3 Accessories 15
- 1.5 Specifications 15
- Dolby Digital 19
- Surround EX mode 19
- 1.9 Regulatory Notices 22
- 1.9.5 Notices for Europe 23
- Chapter 2 25
- Installation 25
- 2.3 Mount the CP650 27
- 2.5 Connect the CP650 28
- 2.5.2 Remote Controls 29
- 2.5.5 Digital Audio Sources 32
- OPTION CARD I/O 33
- (See Section 9.3.2.) 36
- PROFESSIONAL AUDIO 37
- EQUIPMENT 4J06 37
- CP650 INSTALLATION WIRING 38
- AUDIO OUTPUT CONNECTIONS 38
- FLOW CHART 41
- CP650 SYSTEM 41
- Chapter 3 43
- 3 1/3 db 46
- Chapter 4 53
- B-Chain Alignment 53
- 4.2 Microphone Placement 54
- 4.3 Initial Setup 55
- 4.5.1 Main Channels 58
- 4.5.2 Subwoofer Channel 60
- Cat. No. 791 61
- Screen Loss 61
- Filter Jumpers 61
- Setting Corner Frequency 65
- Next Channel 68
- Crossover Levels screen 69
- 1, 2, 4 kHz 72
- = Flat 73
- = EQ Assist 73
- 4.7.4 The EQ Assist Feature 74
- Saving Changes 76
- Chapter 5 81
- A-Chain Alignment 81
- 5.4 Dolby Level Set 84
- O O 85
- O O 85
- 5.6 Cell Alignment Check 87
- 5.7 Cell Wiring Check 88
- 5.8 Azimuth Check 88
- 5.9 Focus Check 89
- Chapter 6 93
- Digital Soundheads 93
- 6.3 Focus Adjustment 94
- Chapter 7 97
- Final Adjustments 97
- Width (feet) 100
- Width (meters) 101
- 7.5 Nonsync Level Adjustment 103
- < + > 104
- 105
- 7.11 Reversion Mode 108
- 7.13 Noise Gating 109
- 7.14.1 Operation 110
- • Auditorium unoccupied 110
- • Doors closed 110
- 7.14.4 “FAIL” Parameters 113
- 7.16 Clock Set 115
- 7.17 Date Set 116
- Chapter 8 117
- Accessories 117
- 8.2.1 Remove the Housing 118
- Top View 119
- 8.2.5 Assemble the Unit 120
- 8.2.6 Connect to the CP650 121
- Chapter 9 123
- Remove wires 124
- Oscilloscope 125
- Output Adjust 126
- Replacement lamp: 127
- Use only General Electric EPT 127
- Reflector-type 127
- Dolby Part No. 34010 127
- 9.3 CP650 Troubleshooting 128
- FB425C04.CDR 129
- 9.3.3 The Event Log 130
- 9.3.4 Troubleshooting Chart 130
- NO SOUND AT ALL 131
- NO SOUND IN SOME 132
- FORMATS 132
- FADER PROBLEMS 133
- CONTROL PROBLEMS 133
- RUMBLES, WHISTLES 134
- HUM IN SOUND 134
- TROUBLE IN ONE OR 135
- MORE CHANNELS 135
- CHANGEOVER AND 138
- CONTROL TROUBLES 138
- CP650 POWER SUPPLY WIRING 140
- CAT.NO.776-1 (BLACK COVER) 140
- CAT.NO.776-2 (GOLD COVER) 141
- CAT. NO. 701 EXPLODED VIEW 142
- CAT. NO. 700/701 REAR VIEW 143
- Appendix A 145
- Software Operations 145
- A.2 Updating CP650 Software 146
- Appendix B 149
- Back Panel Connectors 149
- * No connection 150
- D-connector 150
- B.2 Input Connectors 152
- Pin Connection 154
- Pin Connection 155
- B.3 I/O Connectors 156
- Appendix C 159
- 123 7456 8 160
- Appendix D 161
- Format Descriptions 161
- D.2 Format Definitions 162
- Cat. No. 778 AES1 171
- Appendix E 173
- External Control of CP650 173
- Commands 174
- Examples 175
- Appendix F 179
- Setup and User Menus 179
- + = 179
- Mutes CP650 if not detecting 181
- F.2 CP650 User Menu 182
- DIP switch 6 DOWN 182
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