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- TROUBLESHOOTING
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SECTION 10
TROUBLESHOOTING
Your theater sound system consists of a number of critical audio components in
addition to the Dolby CP500. Thus, the first step when something goes wrong with
the sound is to find the source of the problem. The troubleshooting chart, starting
on page 7, can be helpful.
If the troubleshooting chart is not sufficient for finding and solving the problem
right away, the procedures in the following manual sections should be helpful.
If you are unable to solve the problem using the information which follows, call
your local authorized service engineer. Section 3 of this manual contains fold-out
drawings of the circuit card locations, which will help if a phone discussion with
your service engineer is necessary.
10.1 During the Show
10.1.1 If Film Sound Is Lost
1. First, check that the correct format and projector are still selected.
2. Verify that the exciter lamp(s) in both the analog and digital (if so equipped)
film readers are on.
3. Check that the system is not in Mute, the fader is set to "4.0" or above, and that
the front panel still responds to the controls.
4. If your installation uses an auditorium fader (fader display shows "AU"), check
the setting of this fader.
5. Open the front door of the CP500 and switch to Bypass using the pushbutton
switch in the lower right corner. If sound is restored, it will be playing in mono,
but you can continue the show while you try to find the source of the trouble.
6. If sound is not restored, check that bypass power is connected to the CP500. A
red LED located above the front panel knob will be on if bypass power is
present. An external bypass transformer must be connected to the CP500 and
plugged into an operational power source for Bypass to work.
7. If these methods do not restore film sound, press the bypass power switch in the
lower right hand corner behind the door again. When the Current Format
screen appears, switch the CP500 to non-sync and play your source of
intermission music. If the system operates properly in this format, there is no
problem with the equipment following the CP500 (such as power amplifiers and
loudspeakers). The problem may be in the projector(s). Double-check both
projectors, and if possible continue the show using the other projector.
- Film-Tech 1
- Model CP500 2
- Model CP500 3
- TABLE OF CONTENTS 4
- 1.1 About the Dolby CP500 10
- 1.3 About This Manual 11
- 1.4 Specifications 12
- 1.5 Regulatory Notices 14
- SECTION 2 16
- EQUIPMENT REQUIRED 16
- TEST FILM 17
- 3.1.2 While playing the film: 18
- 3.2 Mount the CP500 19
- 3.3 Connect the CP500 19
- (Models CP500-D, and -70) 20
- Figure 3 - 2 22
- Figure 3 - 3 22
- 3.4 Check and Set Jumpers 23
- CAT. NO. 683 25
- Appendix B, Cat. No. 683 26
- Model CP500-D 27
- Model CP500-D/300 28
- Model CP500-SR 28
- Model CP500-70 28
- 3.6 Bypass Power Wiring 29
- 3.7 Power On 30
- 4.1 The CP500 Front Panel 32
- 4.2 System Password 35
- 4.3 Aligning the B-Chain 36
- 5.1 Check Theater Equipment 38
- 5.2.2 Screen Channels 39
- B-Chain Alignment 40
- 5.3 Room Equalization 41
- “85 dBC” 44
- Reference 47
- Response 47
- CAT. NO. 682 52
- Cat. No. 682 card 53
- 6.1 Aligning the A-Chain 54
- LAMP VOLTAGE DC ADJUSTMENT 56
- OSCILLOSCOPE TRACES 60
- CAT. NO. 661 61
- P1, Left 62
- 7.1 Mechanical Alignment 66
- 2.7 to 5 volts 67
- Voltage Adjust 68
- 7.6 Optical Alignment 69
- Figure 7- 5 70
- 7.8 Film Threading 71
- 7.9 Cat. No. 673 72
- 7.11 Format Control 72
- Allowable Source Formats 75
- Allowable Target Formats 75
- How It Works 75
- Assigning Source Formats 76
- Assigning Target Formats 77
- Figure 7- 8 78
- 7.13.2 Print Cleanliness 79
- 7.13.3 Adjustments 79
- SECTION 8 80
- FINAL ADJUSTMENTS 80
- 8.2.1 Static 82
- 8.2.2 Dynamic 83
- 8.2.3 Typical Settings 83
- Width (feet) 84
- Width (meters) 84
- 8.4 Bypass Adjustments 85
- Position J900 to 86
- REMEMBER 87
- Format 04 Dolby Stereo 89
- Adjustments 90
- 8.5 About Non-sync 91
- 8.6 Mute Speed Adjustment 92
- Figure 9 - 1 93
- CAT. NO. 689 REMOTE 94
- 9.1.3 Auditorium Fader 95
- 9.2.1 Operation 96
- 9.2.2 Components 98
- 10.1 During the Show 99
- Surround Speakers 101
- Electronic Crossover: 101
- 10.2 Between Shows 102
- WARNING: 104
- 10.3 Troubleshooting Chart 105
- NO SOUND AT ALL 106
- NO SOUND IN SOME 107
- FADER PROBLEMS 108
- CONTROL PROBLEMS 108
- RUMBLES, WHISTLES 109
- HUM etc. IN SOUND 109
- TROUBLE IN ONE OR 110
- MORE CHANNELS 110
- CHANGEOVER AND 113
- CONTROL TROUBLES 113
- APPENDIX A 115
- ADVANCED OPERATIONS 115
- Cancel OK 116
- A.2 Saving System Settings 119
- Saving System Settings 120
- A.2.2 Using Load500 Software 125
- Connect to Load500 127
- Menu Cancel OK 130
- B.1 Description and Features 131
- B.2 Installation 131
- B.3 Alignment 132
- B.4 Special Applications 134
- B.5 Headers Available 135
- B.6 Jumpers and Headers 136
- APPENDIX C 138
- 9. Mic. Input Connector: 140
- System Setup Menu Tree 144
- Signal Block Diagram 144
- Basic Functions 145
- Auxiliary Data Channel 147
- Optical Sound 149
- Magnetic Sound 150
- Dolby Gets Involved 151
- The Next Step: Dolby SR 152
- And Now - Dolby Digital 152
- About Dolby AC-3 153
- Making Films Sound Better 153
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