Lexicon 300L Effect Processor
Hersteller:
Modell:
300L
Datum:
1996
Kategorie:
Gruppe:
Beschreibung:
Digital Effects Processor
Serviceanleitung
Dokumenttyp:
Serviceanleitung
Seiten:
106
Größe:
319.76 Kbytes (327437 Bytes)
Sprache:
english
Revision:
Dokument-ID:
070-11474
Datum:
01 Januar 1996
Qualität:
Gescanntes Dokument, alles ist lesbar.
Upload Datum:
13 September 2017
MD5:
fea36057b6cf2373f90dd8df2fcbf2da
Downloads:
886

Information

1. 300L Controls and Connectors Mounting ... 1-2 Power Requirements ... 1-2 Rear Panel ... 1-3 Connectors and Cables ... 1-4 About the LARC ... 1-6 How to Interface the LARC ... 1-7 Setting Analog Audio Levels ... 1-8 Periodic Maintenance ... 1-10 Ordering parts ... 1-10 Returning units for service ... 1-10 Table of Contents 2. Performance Verification Introduction ... 2-2 Initialization and Inspection ... 2-3 Power Supply ... 2-4 Power Fail ... 2-5 Timecode Tests ... 2-5 Listening ... 2-6 Audio Proof of Performance ... 2-7 Level Test • Frequency Response • Noise • THD Crosstalk • Power Up • Shock DSP Board Troubleshooting ... 2-10 Cable Connections ... 2-10 Audio Problems ... 2-11 One Channel Bad • Both Channels Bad • No Output No Output with no relay click on power up • Effects don't sound the same as when stored • The LARC control head will not light • Touching a LARC slider resets unit Audio Precision ATE Test Descriptions ... 2-13 3. Circuit Description Architectural Overview ... 3-2 Host Board ... 3-3 68008 Bus Interface ... 3-5 Interrupts ... 3-6 Memory ... 3-6 The DUART ... 3-7 Duart Interrupts • DUART Input/Output Ports • DUART Input Ports • DUART Output Ports Time Code Chip Select ... 3-9 Limits of Operation ... 3-9 System Clock Generation Circuits ... 3-11 Master Clock • Clock Source • Sample Clocks Phase-Locked Loop ... 3-12 The Phase Comparator • Loop Filter • The VCO Input/Output Audio Level Strobe ... 3-13 Z80 DMA Access ... 3-14 Digital Interface Board ... 3-17 AES/EBU Interface • EIAJ CP-340 Interface • Time Code Input • EMI Considerations DSP Board ... 3-18 DSP Slaves - Lexichips ... 3-19 Z80 Control Processors ... 3-19 Z80 DMA Interface • Slave Control Status Registers Slave Status Registers ... 3-21 Wait State Generation ... 3-22 Audio Routing Data ... 3-22 Routing Implementation • Input Routing • Output Routing Lexichip I/O ... 3-24 Lexichip Input • Lexichip Output • Inter-Lexichip Communication Digital Filter ... 3-25 Peak-Detect ... 3-26 MIDI ... 3-26 Audio RAM Boards ... 3-26 Analog Boards ... 3-27 Analog I/O Board • Analog Motherboard • Differential Input Circuitry • Programmable Input Gain Circuitry • Pre-Emphasis/ Input • Offset Servo • A/D Conversion • D/A Conversion Output Filtering • Programmable Output Gain Circuitry Balanced Output Driver • Voltage Regulators and Relay Drivers Power Supply Board ... 3-30 LARC ... 3-31 Power Supply • CPU • Reset Logic • Address Decoding Logic • ADC Logic • UART Logic • RS-422 Logic • Litronix Display Logic • Buffered Bus and Sink Logic Specifications Parts List

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