STUDIO REPAIR » Lexicon » PCM 70 - Multi Effects  (18 Slides)     [Page 1 of 1] :: Jump To  
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Lexicon PCM 70 - Digital Multi-Effects Processor
 
Lexicon PCM 70 - Opened * …
Lexicon PCM 70 - Display * …
Lexicon PCM 70 - Romantic * A quite romantic view of the PCM 70 main board…
Lexicon PCM 70 - Mainboard * Component side of the large PCM 70 mainboard. It consists of two Z80 CPUs accompanied by three specialized Lexicon high speed processors - they do the number crunching for the audio process algorithms.
Lexicon PCM 70 - Mainboard * Solder side of the PCM 70 main printed circuit board.
Lexicon PCM 70 - Display Reverse * A vacuum fluorescent display (VFD)
  Opened  
  Display  
  Romantic  
  Mainboard  
  Mainboard  
  Display Reverse  
Lexicon PCM 70 - Topology * …
Lexicon PCM 70 - Topology * …
Lexicon PCM 70 - LexiChips * The two LexiChips inside the PCM 70 - this is the place where Lexicon's algorithms are forged into silicon…
Lexicon PCM 70 - Memory * Memory management unit with 128 kilobytes of dynamic RAM (organized in 64k x 16bit).
Lexicon PCM 70 - Master CPU * Z80 CPU, 6402 UART, RAM
Lexicon PCM 70 - Slave Processor * Z80 CPU accompanied by 16kB static RAM
  Topology  
  Topology  
  LexiChips  
  Memory  
  Master CPU  
  Slave Processor  
Lexicon PCM 70 - A/D Converter * …
Lexicon PCM 70 - D/A Converter * Burr Brown PCM53
Lexicon PCM 70 - Analog Circuitry * …
Lexicon PCM 70 - dbx2150 VCAs * Audio output is controlled by two VCAs steered by a separate DAC.
Lexicon PCM 70 - Power Supply * On-board power supply unit
Lexicon PCM 70 - Power Supply * The switched-mode part of the PSU generates the +5V rail for the common digital circuits. The C122 thyristor isn't part of the regulator but a crowbar device safeguarding the +5V power rail against overvoltages. And watch the neat grinding line straight through the ground plane…
  A/D Converter  
  D/A Converter  
  Analog Circuitry  
  dbx2150 VCAs  
  Power Supply  
  Power Supply  

 
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