Lexicon Pcm 81 Service Manual

Summary of Contents for LEXICON PCM 81 Page 1 Whenever a delay value is displayed in Edit always active, allowing you explanatory message will mode, press Up and Tempo simultaneously to toggle these two to change tempo on the fly. Appear on the display.

Full text of ' N INPUT IN X2 vco pcm 41 digital delay processor S ERVICE M ANUAL lexicon Lexicon, Inc., 60 Turner Street Waltham. 02154/617-891-6790 Bid PCM -4 1 SERVICE MANUAL 5.1.16 Output Mixer 5.1.17 Bypass Switch 5.1.18 Output Stage 2 VCO and LFO 5.2. 1 Clock Oscillator 5.2.2 Depth and Waveform Controls 5.2.3 Delay Multiply Control 5.2.4 Envelope Follower 5.2.5 Waveform Generator 3 Digital 5.3. 1 Address Offset Logic Basics 5.3.2 Timing Generation 5.3.3 Address Counter 5.3.4 Delay Select Logic 5.3.5 Adder Logic 5.3.6 Address Multiplexer 5.3.7 Memory 5.3.8 Bus Logic 5.3.9 Conversion Logic 5.4 Power Supply 6.0 Reference Section 6.1 Interior Layouts 6.2 Schematics 6.2.1 Analog 6.2.2 Converter 6.2.3 Digital 6.2.4 VCO/Power Supply 6.3 Parts Lists 6.3.1 Chassis 6.3.2 Motherboard 6.3.3 Headroom Indicator P.C. Board 6.3.4 Delay Select (Display) P.C. Board 6.4 I.C.

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Layouts 6.5 Signature Analysis Tables 7.0 Repair Return 7.1 Parts Replacement 7.2 Warranty ii PCM -4 1 SERVICE MANUAL TABLE OF CONTENTS 1.0 Introduction 1.1 Equipment Required 1.2 Description 1. 3 Specifications 2.0 Inspection 2.

1 Power-up 2.2 Performance Tests 2.2.1 Input Gain, Headroom Indicator 2.2.2 Output Level, Distortion 2.2.3 Signal -to-Noise 2.2.4 Frequency Response 2.2.5 Feedback, Mix Out, Invert Switches 2.2.6 Delay Time 2.2.7 VCO Section 2.2.8 External Jacks 3.0 Calibration 3.0. 1 Power Supply 3.0. 2 VCO Calibration 3.0. 3 Converter Calibration 3.0. 4 Filter Calibration 3.0.

5 Mix Control Calibration 3.1 Voltage Changeover 3.2 RFI Option 4.0 Troubleshooting 4.1 Check Power Supply 4.2 Unit Functions Only at '0' Delay 4.3 Noise Increases with Delay 4.4 Distortion at '0' Delay: Converter 4.5 Filter Problems 4.6 Signature Analysis Testing 5.0 Theory of Operation 5. 1 Theory of Operation - Analog 5.1.1 Input Stage 5.1.2 Input Filter 5.1.3 Pre-emphasis Network, Input Mixer 5.1.4 Headroom Indicator 5.1.5 Sample/Hold 5.1.6 Log Circuit 5.1.7 A to D Converter 5.1.8 D to A Converter 5.1.9 Anti-Log Circuit 5.1.10 Output Deglitcher 5.1.11 Aperture Correction Filter 5.1.12 Inverter 5.1.13 Feedback 5.1.14 De-emphasis Network 5.1.15 Output Filter i DELAY LEVEL FEEDBACK FILTER OUTPUT MIX 0 0 8 16 2 4 4 0 7 0 13 00 DELAY MULTIPLY DEPTH WAVEFORM RATE IG. 1.0 FRONT & REAR PHOTOS PCM -41 SERVICE MANUAL INTRODUCTION 1.0 INTRODUCTON This manual provides service and maintenance information for the Lexicon PCM-41 Digital Delay Processor. It is intended for use by qualified service personnel. Efficient service requires a basic understanding of both analog and digital circuits, as well as most of the equipment listed below. Routine calibration or verification of performance may be accomplished with only a few pieces of test equipment.

In the event that repair or calibration cannot be performed in the field, the unit may be returned to the factory for service (see section 7.0). 1.1 EQUIPMENT REQUIRED The following list of test equipment will be helpful or necessary for calibration or repair of the PCM-41: a) D.C. - 15 MHz dual trace scope with D.C. Triggering such as Tektronix T922, Hewlett-Packard 1220A, or Philips 3226. B) Low distortion (5VI OOUT OATA OUT VuD POWER 1 * 1?V!

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