STUDIO REPAIR » Lexicon » PCM 70 - Multi Effects »  Power Supply     [Image 17 of 18]  :: Jump To  
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Lexicon PCM 70  •  Power Supply
On-board power supply unit
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

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.

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Lexicon PCM 70 - Power Supply - Image by Nikolaus Riehm - Equipment courtesy of Karl Bartos
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…



 
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