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Roland αJUNO-2 / JU-2 - Analog Polyphonic Synthesizer with DCOs
 

Roland Alpha Juno-2 - Twins * …
Roland Alpha Juno-2 - Twins * Double JU-2
Roland Alpha Juno-2 - Panel * α-Dial Section with Volume Slider and Pitch Bender
Roland Alpha Juno-2 - Panel * Edit and Function Buttons
Roland Alpha Juno-2 - Panel * Patch Selection Buttons
Roland Alpha Juno-2 - Panel * Logotype and Imprint
  Twins  
  Twins  
  Panel  
  Panel  
  Panel  
  Panel  
Roland Alpha Juno-2 - Opened * …
Roland Alpha Juno-2 - Opened * …
Roland Alpha Juno-2 - Keyboard * Partly Dismantled Keyboard Assembly
Roland Alpha Juno-2 - Keyboard * Keyboard Assembly Dismantled for Contact Cleaning
Roland Alpha Juno-2 - Main Board * JU-2 Assembly 7616110 / HS-80 Assembly 76168120
Roland Alpha Juno-2 - Main Board * JU-2 Main Board Assembly 7616110 (Revision w/o the HS-80 Assembly No 76168120 Imprint)
  Opened  
  Opened  
  Keyboard  
  Keyboard  
  Main Board  
  Main Board  
Roland Alpha Juno-2 - Main Board * Main PCB Soldering Side
Roland Alpha Juno-2 - Main Board * JU-2 Assembly 7616110 / HS-80 Assembly 76168120
Roland Alpha Juno-2 - Circuitry * Roland ASICs: DCO (Type RD87123), S&H (Type 7302) and VCF/VCA (Type IR3R05)
Roland Alpha Juno-2 - Circuitry * Intel 8032 8-bit MCU, RAM, ROM, Gate Arrays, ADC (NEC μPD7001 8-bit Serial-I/O ADC)
Roland Alpha Juno-2 - Circuitry * Intel 8032 8-bit MCU, RAM, ROM, Gate Array (this board revision doesn't contain a HS-80 imprint)
Roland Alpha Juno-2 - Logotype * Main Board Logotype
  Main Board  
  Main Board  
  Circuitry  
  Circuitry  
  Circuitry  
  Logotype  
Roland Alpha Juno-2 - DCO * Roland 87123 Integrated DCO Circuitry
Roland Alpha Juno-2 - Circuitry * Voice's VCF/VCA Circuitry
Roland Alpha Juno-2 - D/A Converter * The Large Resistor Array RA2 in Conjunction with a NEC μPC4082 (IC9) JFET-Input Operational Amplifier forms the D/A Converter for all the Control Voltages
Roland Alpha Juno-2 - A/D Converter * NEC μPD7001 8-bit A/D Converter with Serial I/O
Roland Alpha Juno-2 - Circuitry * Capacitor Array of the 4051-based S&H Circuitry. Roland's 7302 S&H-ASIC Contains Integrated Capacitors.
Roland Alpha Juno-2 - IR3R05 * Typical Point of Failure: The Integrated VCF/VCA (Roland's IR3R05)
  DCO  
  Circuitry  
  D/A Converter  
  A/D Converter  
  Circuitry  
  IR3R05  
Roland Alpha Juno-2 - Trimmer * VCF Frequency Adjustment Trim-Pots
Roland Alpha Juno-2 - Battery * Desoldered Backup Battery
Roland Alpha Juno-2 - Battery * Replaced Backup Battery with Socket
Roland Alpha Juno-2 - Chorus Board * …
Roland Alpha Juno-2 - Aftertouch * Pressure Strip Connector
Roland Alpha Juno-2 - Slider * Volume Board Assembly 76160400
  Trimmer  
  Battery  
  Battery  
  Chorus Board  
  Aftertouch  
  Slider  
Roland Alpha Juno-2 - Encoder * The α-Dial Encoder
Roland Alpha Juno-2 - Encoder * The α-Dial Encoder Dismounted
Roland Alpha Juno-2 - Encoder * The α-Dial Encoder Contact Board
Roland Alpha Juno-2 - Slider * Dismounted Volume Slider
Roland Alpha Juno-2 - Test Mode * LCD Indicating the Entered Test Mode
Roland Alpha Juno-2 - Power Supply * Mains Inlet and Transformer
  Encoder  
  Encoder  
  Encoder  
  Slider  
  Test Mode  
  Power Supply  
Roland Alpha Juno-2 - Power Supply * Power Board (Assembly 76160111 for 100/117 Volts and 76160114 for 220/240 Volts)
Roland Alpha Juno-2 - Power Supply * PSU Board Soldering Side
Roland Alpha Juno-2 - Memory Cartridge * The cartridge contains one battery backed-up Toshiba TC5517APL 16kB CMOS static RAM (2kx8bit)
  Power Supply  
  Power Supply  
  Memory Cartridge  


 
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