STUDIO REPAIR - Lexicon PCM 70 - Analog Circuitry

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▪ Device:		Lexicon PCM 70
▪ Topic:		Analog Circuitry
▪ Abstract:		…
▪ Creator:		Image by Nikolaus Riehm
▪ Website:		www.studiorepair.com
▪ Editor:		Nikolaus Riehm

STUDIO REPAIR » Lexicon » PCM 70 - Multi Effects » Analog Circuitry

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Lexicon PCM 70 • Analog Circuitry

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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

Lexicon PCM 70 - A/D Converter * …

Lexicon PCM 70 - D/A Converter * Burr Brown PCM53

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Lexicon PCM 70 - Analog Circuitry - Image by

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…

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