Dolby Laboratories CP65 manual Chain Alignment Procedures, Off

Page 43

			5-8
			B-Chain Alignment Procedures
a. Setting Room Equalization
Step		Action	Indication
No.
8		CAT. NO. 441
		CAT. NO. 441
4	5	6
4		6
3		7	auto
			auto
2		8	subwoofer
2		8	off
1		9
0		10	Subwoofer
			Subwoofer
			off

9

NORMAL BYPASS

10	local active

4	5	6
4		6		Dolby Stereo
3		7	04	Dolby Stereo
3		7	04	A-type
				A-type
2			8
1		9
0		10
select		mute

local/remote

11

local active
4	5	6
4		6
3		7
2		8
1		9
0		10

selectmute local/remote

5-9

B-Chain Alignment Procedures

a. Setting Room Equalization

Notes

Set the FADER to the 0 position.

If a Cat No. 441 Surround Equalizer, Subwoofer card is fitted set the subwoofer switch to the OFF position.

Set the NORMAL/BYPASS switch to the NORMAL position.

Verify that the fader local active LED is on. If necessary, press the select local/remote switch.

Press the 04 Dolby Stereo A-typeswitch; the LED in the switch should light.

Switch on the center channel pink noise on the Cat. No. 85 Pink Noise Generator (C switch up or down).

Slowly advance the FADER control to position 7. You should hear pink noise.

Image 43

Contents Model CP65 Cinema Processor Dolby Laboratories Inc Headquarters Table of Contents Section Reference Block Diagrams Introduction Page Section Equipment Required Jiffy Test Film Cat. No 2 Listen . . . Film Cat. No Smpte Buzz Track Stereo Optical Surround Level Cat. NoSection Initial SET-UP and Installation Voltage Acceptable Setting Voltage Range Fuse Type Next, check the jumpers in the following locations Cat. No , B-Chain Card Cat. No , Power Supply ModuleJ2 NON-SYNC Cat. No , Control Logic CardStandard CP65 or CP65A CP65 BackplaneCP65-300 High Low Subwoofer subwoofer Output output These Modules are Necessary for Bypass Operation Channel Decoder Slot Card Function Cat. NoTwo-channel Noise Reduction ModuleContains a semi-regulated power supply with International Voltage Setting Fuse TypeIEC Notices Room lighting dimmer controls SCR-TYPE HUM ProblemsPage Aligning the B-Chain Section AN Overview of the Alignment ProcedurePage Page Section Chain Alignment Action Indication Preliminary ProceduresLamp Voltage Optical Preamplifier Adjustments Chain Alignment Procedures Optical Preamplifier Adjustments 222 CAT. no Test Film Oscilloscope Traces Repeat Repeat 1 → CAT noMagnetic Preamplifier Adjustments Magnetic Alignment 100mV Section Chain Alignment Bypass Setting Room EqualizationLoudspeakers and Crossovers General AmplifiersOff Chain Alignment ProceduresAction RepeatChain Alignment Procedures Setting Room Equalization Do not adjust Paul 14 → 21 R 14 → Setting Room Equalization b. Adjusting L,C,R Gain79 dBC Setting Mono GainChain Alignment Procedures Subwoofer Alignment Cat. No 85 dBC 90 dBCStep No FromSelect format 04 Dolby Stereo A-Type 441 Same ASSurround Equalization Alignment Cat. No Cat. No 441 Surround Equalization Alignment Cat. No NotesDesired 88 dBC Bypass Thumbwheel Switch Adjustment of Surround DelayMsec Setting Xx dBC Chain Alignment Procedures Adjustment of Bypass GainXx dBC -3 dB Yy dBC FromPress the format 60 non sync switch Adjustment of Non-sync GainAuto Freq Repeat page 5-20 Step Adjustment of Mono Gain and Equalization NotesPress the format 04 Dolby Stereo A-type switch Chain Alignment Procedures Final ChecksSection 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 15V +12B Cat. No +24V +15V+15M Appendix a Checking Phasing of Speakers Appendix B Effect of Changes in Slit Height on Slit Losses Operation Appendix C CP65M Mono InstructionsCat. No a Circuit Description Schematic Cat. No a Terminal Block TB3 Appendix D Backplane Connections ListConnector J18