Dolby Laboratories CP65 manual Chain Alignment Procedures Subwoofer Alignment Cat. No

Page 50

	5-22
	B-Chain Alignment Procedures
d. Subwoofer Alignment (Cat. No. 441)

Step	Action			Indication
No.
1	CAT. NO. 441
	CAT. NO. 441

auto subwoofer off

2	local active

4 5 6

3 7

2 8

19

0 10

selectmute local/remote

3

	10	Dolby Stereo
	10	Digital
		Digital

5-23

B-Chain Alignment Procedures

d. Subwoofer Alignment (Cat. No. 441)

Notes

CP65 processors may be supplied in a number of different configurations.

If the CP65 being installed does not contain a Cat. No. 441, skip this procedure and the next procedure and go directly to part, Adjustment of Surround Delay, on page 5-43.

The Subwoofer auto/off switch on the Cat. No. 441 card enables the subwoofer in formats other than Non-sync (format 60) , Mono (format 01) and magentic no NR (format 22). The switch must be in the auto (up) position at any time the subwoofer system is to function.

Confirm that the microphone is in the position defined on page 5-7.

All connections established in the room equalization procedure apply to the following steps.

The main front panel FADER should be active and set to 7. If necessary, press the select local/remote switch.

Place the Le toggle switch on the Cat. No. 85C card in the ON (up or down) position and set the CP65 to format 10 Dolby Stereo Digital.

Image 50

Contents Model CP65 Cinema Processor Dolby Laboratories Inc Headquarters Table of Contents Section Reference Block Diagrams Introduction Page Section Equipment Required Smpte Buzz Track Stereo Optical Surround Level Cat. No Jiffy Test Film Cat. No 2 Listen . . . Film Cat. NoSection Initial SET-UP and Installation Voltage Acceptable Setting Voltage Range Fuse Type Next, check the jumpers in the following locations Cat. No , Power Supply Module Cat. No , B-Chain CardCat. No , Control Logic Card J2 NON-SYNCCP65 Backplane Standard CP65 or CP65ACP65-300 High Low Subwoofer subwoofer Output output These Modules are Necessary for Bypass Operation Reduction Module Slot Card Function Cat. NoTwo-channel Noise Channel DecoderContains a semi-regulated power supply with Voltage Setting Fuse Type InternationalIEC Notices HUM Problems Room lighting dimmer controls SCR-TYPEPage Section AN Overview of the Alignment Procedure Aligning the B-ChainPage Page Section Chain Alignment Preliminary Procedures Action IndicationLamp Voltage Optical Preamplifier Adjustments Chain Alignment Procedures Optical Preamplifier Adjustments 222 CAT. no Test Film Oscilloscope Traces Repeat CAT no Repeat 1 →Magnetic Preamplifier Adjustments Magnetic Alignment 100mV Section Chain Alignment Setting Room Equalization BypassLoudspeakers and Crossovers Amplifiers GeneralChain Alignment Procedures OffRepeat ActionChain Alignment Procedures Setting Room Equalization Do not adjust Paul Setting Room Equalization b. Adjusting L,C,R Gain 14 → 21 R 14 →Setting Mono Gain 79 dBCChain Alignment Procedures Subwoofer Alignment Cat. No 90 dBC 85 dBCFrom Step NoSelect format 04 Dolby Stereo A-Type Same AS 441Surround Equalization Alignment Cat. No Surround Equalization Alignment Cat. No Notes Cat. No 441Desired 88 dBC Bypass Msec Setting Adjustment of Surround DelayThumbwheel Switch Chain Alignment Procedures Adjustment of Bypass Gain Xx dBCFrom Xx dBC -3 dB Yy dBCAdjustment of Non-sync Gain Press the format 60 non sync switchAuto Freq Adjustment of Mono Gain and Equalization Notes Repeat page 5-20 StepChain Alignment Procedures Final Checks Press the format 04 Dolby Stereo A-type switchSection Reference Diagrams Cat. No Dual Noise Reduction Module Inputs Cat. No Optical Bass Extension and Surround Equalizer Card Cat. No B-Chain Facilities Card Cat. No Power Supply Card Cat. No Transformer Module Inputs Cat. No Control Logic Card +15M Cat. No +24V +15V15V +12B Appendix a Checking Phasing of Speakers Appendix B Effect of Changes in Slit Height on Slit Losses Cat. No a Circuit Description Appendix C CP65M Mono InstructionsOperation Schematic Cat. No a Appendix D Backplane Connections List Terminal Block TB3Connector J18