STUDIO REPAIR - Prophet-5

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Sequential Circuits Prophet-5 (Model 1000) - Polyphonic Analog Synthesizer

Sequential Circuits Prophet-5 - Rear View * SCI Model 1000 Rev 3.3

Sequential Circuits Prophet-5 - Opened * SCI Model 1000 Rev 2.0

Sequential Circuits Prophet-5 - Circuit Boards * SCI Model 1000 Rev 2.0 - Printed Circuit Boards

Sequential Circuits Prophet-5 - Panel Board * SCI Model 1000 Rev 3.3: PCB 1 - Right Control Panel

Sequential Circuits Prophet-5 - Panel Board * SCI Model 1000 Rev 3.3: PCB 2 - Left Control Panel

Sequential Circuits Prophet-5 - Circuit Boards * Board 4 (Voice Board) and Board 3 Rev 3.3 (Computer Board)

Rear View

Opened

Panel Board

Panel Board

Sequential Circuits Prophet-5 - Computer Board * SCI Model 1000 Rev 3.0: Board 3 (Sect. 3.1 / 3.2)

Sequential Circuits Prophet-5 - Computer Board * SCI Model 1000 Rev 3.0: Board 3 (Sect. 3.2 / 3.3)

Sequential Circuits Prophet-5 - Computer Board * SCI Model 1000 Rev 3.0: Board 3 (Sect. 3.3 / 3.4)

Sequential Circuits Prophet-5 - Digital Circuitry * SCI Model 1000 Rev 3.3: Part of the Rev 3.2 > Rev 3.3 Upgrade to Expand the Patch Memory

Sequential Circuits Prophet-5 - Analog Circuitry * SCI Model 1000 Rev 3.3: CEM 3310 Voltage Controlled Envelope Generators

Sequential Circuits Prophet-5 - CEM 3340 VCOs * SCI Model 1000 Rev 3.3: CEM 3340 Voltage Controlled Oscillators

Digital Circuitry

Analog Circuitry

Sequential Circuits Prophet-5 - Scratchpad Memory * SCI Model 1000 Rev 3.0: Board 3 (Sect. 3.1) - 2× NEC μPD2114 4096 Bit (1024 × 4 Bits) Static RAM

Sequential Circuits Prophet-5 - Sample & Holds * SCI Model 1000 Rev 3.3 - Oscillator + Filter CV Sample & Holds

Sequential Circuits Prophet-5 - D/A Converter * SCI Model 1000 Rev 3.3: Burr-Brown DAC71-CSB-I D/A Converter

Sequential Circuits Prophet-5 - D/A Converter * Two Different Versions of Burr-Brown's DAC71-CSB-I D/A Converter

Sequential Circuits Prophet-5 - VCO Scaling * SCI Model 1000 Rev 3.3: VCO Control Voltage Scaling, Two CVs per Div. Measured with a HP 54645D Scope at DAC Output (Multiplexed CVs)

Sequential Circuits Prophet-5 - D/A Converter * SCI Model 1000 Rev 3.3: D/A Converter Gain Adjustment (1V/Octave)

Scratchpad Memory

VCO Scaling

Sequential Circuits Prophet-5 - Computer Board * SCI Model 1000 Rev 2.0: Board 3

Sequential Circuits Prophet-5 - Voice Board * SCI Model 1000 Rev 2.0: Board 4

Sequential Circuits Prophet-5 - Voice Board * SCI Model 1000 Rev 2.0 - SSM2030, SSM2020, SSM2040 Integrated Circuits

Sequential Circuits Prophet-5 - SSM2030 VCOs * SCI Model 1000 Rev 2.0: SSM2030 VCOs with Tempco Resistors (Tel Labs Q81) Soldered Piggyback

Sequential Circuits Prophet-5 - SSM2030 VCOs * SCI Model 1000 Rev 2.0: SSM2030 VCOs with Tempco Resistors (Tel Labs Q81) Soldered Piggyback

Sequential Circuits Prophet-5 - D/A Converter * SCI Model 1000 Rev 2.0: Discrete Build 7-Bit D/A-Converter (R-2R Ladder) with a LM723 as Voltage Reference Generator

Voice Board

Voice Board

SSM2030 VCOs

SSM2030 VCOs

Sequential Circuits Prophet-5 - Board Sandwich * SCI Model 1000 Rev 2.0

Sequential Circuits Prophet-5 - SCI MIDI Kit * Original Sequential Circuits Prophet-5 MIDI Kit (SCI Model 841)

Sequential Circuits Prophet-5 - SCI MIDI Kit * Original Sequential Circuits Prophet-5 MIDI Kit (SCI Model 841): Component Side

Sequential Circuits Prophet-5 - SCI MIDI Kit * Original Sequential Circuits Prophet-5 MIDI Kit (SCI Model 841): Soldering Side

Sequential Circuits Prophet-5 - SCI MIDI Kit * Original Sequential Circuits Prophet-5 MIDI Kit (SCI Model 841): Board Marking

Sequential Circuits Prophet-5 - Kenton MIDI Kit * SCI Model 1000 Rev 3.0

SCI MIDI Kit

SCI MIDI Kit

SCI MIDI Kit

SCI MIDI Kit

Kenton MIDI Kit

Sequential Circuits Prophet-5 - Kenton MIDI Kit * Kenton PRO34112 Circuit Boards

Sequential Circuits Prophet-5 - Lintronics MIDI Kit * …

Sequential Circuits Prophet-5 - Wheels * SCI Model 1000 Rev 3.3

Sequential Circuits Prophet-5 - Rear Jacks * SCI Model 1000 Rev 3.3: CV/Gate In, MIDI I/O, Audio Out

Sequential Circuits Prophet-5 - Power Supply * SCI Model 1000 Rev 3.3: Mains Transformer Section

Sequential Circuits Prophet-5 - Power Supply * SCI Model 1000 Rev 2.0

Kenton MIDI Kit

Lintronics MIDI Kit

Wheels

Rear Jacks

Power Supply

Power Supply

Sequential Circuits Prophet-5 - Power Supply * A Rev 3.1 and Upwards PSU (New EPROM Type Needs no +12V and -5V Supplies)

Sequential Circuits Prophet-5 - Power Supply * SCI Model 1000 Rev 3.3: Replacement of a Faulty Voltage Regulator

Sequential Circuits Prophet-5 - RAM Replacement * SCI Model 1000 Rev 3.0: Replacing Faulty 6508-Type Memory ICs With One Single 2016-Type SRAM Chip

Sequential Circuits Prophet-5 - RAM Replacement * SCI Model 1000 Rev 3.0: Replacing Faulty 6508-Type Memory ICs With One Single 2016-Type SRAM Chip

Sequential Circuits Prophet-5 - RAM Replacement * SCI Model 1000 Rev 3.0: Replacing Faulty 6508-Type Memory ICs With One Single 2016-Type SRAM Chip

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 2.0

Power Supply

Power Supply

RAM Replacement

RAM Replacement

RAM Replacement

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 3.3: Voice Board Marking

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 3.3: Computer Board Marking (Inverted Colors for Increased Visibility)

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 2.0: Board Marking (Inverted Colors for Increased Visibility)

Sequential Circuits Prophet-5 - Mantra Code * Even the EPROM Contains the Tibetan Mantra «Om mani padme hung hrih» in its Code

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 3.3: Computer Board Marking

Sequential Circuits Prophet-5 - Board Marking * SCI Model 1000 Rev 3.3: Computer Board Marking

Mantra Code

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