Manuals / Dolby Laboratories / Home Audio / Stereo Amplifier

Dolby Laboratories CP65 L 14 → 21 R 14 →, b. Adjusting L,C,R Gain, 22REPEAT, Action, Indication

Models: CP65

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b. Adjusting L,C,R Gain

		5-18
a. Setting Room Equalization		B-Chain Alignment Procedures
a. Setting Room Equalization
b. Adjusting L,C,R Gain
Step	Action	Indication
No.

21

4 5 6

3 7

2 8

1 9

0 10

22REPEAT

L 14 → 21 R 14 → 21

23	4	5	6
23	4		6
3			7
2			8
1			9

010

b.Adjusting L,C,R Gain

5-19

B-Chain Alignment Procedures

a. Setting Room Equalization b. Adjusting L,C,R Gain

Notes

Turn off the pink noise on the center channel. Turn the fader to 0 or press the Mute button.

Disconnect the center equalizer module from the extender and then remove the extender from the CP65. Re-install the cover on the module and plug it back in. Repeat for the left and right channel equalizer modules, using the Cat. No. 67 extender.

Turn the fader back to ‘7’ or press the mute button again.

b. Adjusting L,C,R Gain

1

Cat. No. 242

mono eq

mono

gain L non-sync

R

L

signal C present R

Ls gnd

L

C

test points R

Ls

L

C

gain

R

Ls

Dolby

85 dBC

Turn the pink noise switches L, C, R on one at a time and adjust the L, C and R gain controls on the Cat. No. 242 B-Chain Card so that each channel produces 85dBC in the theatre, as measured by the sound level meter at the standard location described in Step 15 above. Be sure that the front panel FADER is set to 7, format 04 is selected, and the subwoofer is off during this step.

OFF				0
0	70 6	50	0	3
8	0		4

Image 48

Dolby Laboratories CP65 L 14 → 21 R 14 →, b. Adjusting L,C,R Gain, 22REPEAT, b.Adjusting L,C,R Gain, Action, Indication

Contents

Installation and Alignment Instructions Model CP65 Cinema ProcessorDolby Laboratories Inc U.S. Headquarters U.K. European OfficeDolby Laboratories Inc 100 Potrero Avenue San Francisco, CA TelephoneTable of Contents INITIAL SET-UPAND INSTALLATIONINTRODUCTION EQUIPMENT REQUIREDAPPENDIX A APPENDIX BAPPENDIX C APPENDIX DINTRODUCTION CP6504 Dolby Stereo A-type 05 Dolby Stereo SR 60 Non-syncPage SECTION EQUIPMENT REQUIRED 1 Dolby Tone and Pink Noise - Cat. No2 1kHz, 100% Modulation, Left/Right - Cat. No TEST FILM 3SMPTE Buzz Track4Stereo Optical Surround Level - Cat. No JIFFYSECTION INITIAL SET-UPAND INSTALLATION Setting VoltageAcceptable Voltage RangeCat. No Cat. No. 249, Power Supply Module Cat. No. 242, B-ChainCardJ5 J6 J7 J8 Cat. No. 443, Control Logic Card J3 INCP65 Backplane Standard CP65 or CP65AIn a CP65-300when Cat. No. 300 modules are fitted in place of the normal Cat. No. 350 modules J16 and J18 should be rotated so that the words “Format 42” appears the right way up. With J24 in the “NR” position input signals will be A-typedecoded when the Mag/Aux format is selected. With J24 in the “NO NR” position signals pass through the noise reduction modules but the processing will be turned off. If both of these processing options are required frequently an external switch may be connected to J24 CP65-300J1 Optical Bass Extension output level sets the output level range for the subwoofer channel. In the HIGH position J1 is set at the factory for a power amplifier input sensitivity of between 90 mV and 1.23 V. If the power amplifiers used in the installation are very sensitive 10 mV to 100 mV input sensitivity, it may be necessary to set J1 to the LOW position. If you are unsure of the sensitivity of your power amplifiers set J1 to the LOW position initially. If the high output position is required this will be determined during OBE alignment selected projector. Electronic switches select Card DescriptionsSlot CardTwo-channelNoise Reduction Module2 4 Channel Decoder 7,8,9Slot CardFunction Cat. NoVoltage Setting InternationalFuse TypeIEC NOTICES GB F D I E S NLIMPORTANT SAFETY NOTICE IMPORTANT - NOTE DE SECURITEHUM PROBLEMS 3.Room lighting dimmer controls SCR-TYPEModel CP65 With CP65 FADER turned up and format 04 selected SECTION AN OVERVIEW OF THE ALIGNMENT PROCEDURE 1. Aligning the A-Chain2. Aligning the B-Chain and with a broad range of speakers. Accurate equalization requires the use of standardized acoustic measurement procedures Many loudspeakers used in theatres are far from ideal and require boosting of the low- and high-frequencyextremes in order to produce an approximation of the standard reference response curve. Bass and treble controls-centeredon the turnover points of typical loudspeakers-liftthe ends of the spectrum without the need for large amounts of narrow- band boost from the third-octavecontrols in the Cat. No. 64 cards. The third-octavecontrols are used for minor adjustments that are required to smooth the frequency response curve SECTION A-CHAINALIGNMENT a. Preliminary Procedures a. Preliminary Procedures NotesAction IndicationA-ChainAlignment Procedures a. Preliminary Proceduresa. Preliminary Procedures Notes Actionb. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments NotesAction IndicationA-ChainAlignment Procedures b. Optical Preamplifier Adjustmentsb. Optical Preamplifier Adjustments Notes ActionL L R R L L R R CAT NOb. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments NotesAction IndicationnCAT. NO. 97 TEST FILM REPEATOSCILLOSCOPE TRACES RTA DISPLAYA-ChainAlignment Procedures b. Optical Preamplifier Adjustments12 AND REPEATA-ChainAlignment Procedures b. Optical Preamplifier AdjustmentsCAT NO FOR PROJECTOR NO. REPEAT 1 →b. Optical Preamplifier Adjustments b. Optical Preamplifier Adjustments Notesc. Magnetic Preamplifier Adjustments Magnetic AlignmentA-ChainAlignment Procedures c. Magnetic Preamplifier AdjustmentsMagnetic Alignment SECTION B-CHAINALIGNMENT a. Setting Room Equalization a. Setting Room Equalization Notesbypass ActionLoudspeakers and Crossovers a. Setting Room Equalizationa. Setting Room Equalization Notes Actionbypass AmplifiersGeneral a. Setting Room EqualizationB-ChainAlignment Procedures a. Setting Room Equalization NotesAction IndicationREPEAT a. Setting Room Equalizationa. Setting Room Equalization Notes ActionB-ChainAlignment Procedures a. Setting Room Equalizationa. Setting Room Equalization Notes ActionDo not adjust a. Setting Room Equalizationa. Setting Room Equalization Notes Actiona. Setting Room Equalization a. Setting Room Equalization NotesAction Indicationb. Adjusting L,C,R Gain b.Adjusting L,C,R GainL 14 → 21 R 14 → 22REPEATc. Setting Mono Gain c. Setting Mono Gain Notes79 dBC Actiond. Subwoofer Alignment Cat. No d. Subwoofer Alignment Cat. No. NotesB-ChainAlignment Procedures Action90 dBC B-ChainAlignment Proceduresd. Subwoofer Alignment Cat. No ActionFROM d. Subwoofer Alignment Cat. Nod. Subwoofer Alignment Cat. No ActionSelect format 04 Dolby Stereo A-Type d. Subwoofer Alignment Cat. NoAction REPEATSAME AS d. Subwoofer Alignment Cat. Nod. Subwoofer Alignment Cat. No ActionRe S e. Surround Equalization Alignment Cat. Noe. Surround Equalization Alignment Cat. No Actione. Surround Equalization Alignment Cat. No Actione. Surround Equalization Alignment Cat. No ActionREPEAT 88 dBC e. Surround Equalization Alignment Cat. NoAction B-ChainAlignment Procedures e. Surround Equalization Alignment Cat. NoAction Indicationf. Adjustment of Surround Delay Thumbwheel Switchmsec Settingg. Adjustment of Bypass Gain g. Adjustment of Bypass Gain Notesxx dBC B-ChainAlignment ProceduresFROM xx dBC -3dB yy dBC B-ChainAlignment Proceduresg. Adjustment of Bypass Gain g. Adjustment of Bypass Gain Notesh. Adjustment of Non-syncGain h. Adjustment of Non-syncGain NotesPress the format 60 non sync switch Actionh. Adjustment of Non-syncGain h. Adjustment of Non-syncGain NotesAction Indicationi. Adjustment of Mono Gain and Equalization i.Adjustment of Mono Gain and Equalization Notes5REPEAT PAGE 5-20STEP B-ChainAlignment ProceduresPress the format 04 Dolby Stereo A-type switch JIFFY TEST FILMj. Final Checks j. Final Checks NotesSECTION REFERENCE DIAGRAMS Cat. No. 222 Dual Noise Reduction Module INPUTS OUTPUTSPage Cat. No. 242 B-ChainFacilities Card Cat. No. 249 Power Supply Card Cat. No. 259 Transformer Module INPUTS OUTPUTSCat. No. 443 Control Logic Card CP65 POWER DISTRIBUTION TABLE Cat. No+24V +15VAPPENDIX A CHECKING PHASING OF SPEAKERS Frequency in Hz 5,00010,000 20,000APPENDIX C CP65M MONO INSTRUCTIONS 1.Operation2.Cat. No. 327A Circuit Description C.2 Schematic Cat. No. 327A A3C2984 revAPPENDIX D BACKPLANE CONNECTIONS LIST CP65 Backplane ConnectionsTerminal Block TB1 Terminal Block TB2D connector J18