STUDIO REPAIR » Roland » αJUNO-2 »  D/A Converter     [Image 21 of 39]  :: Jump To  
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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 - 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

Roland Alpha Juno-2 - DCO * Roland 87123 Integrated DCO Circuitry

Roland Alpha Juno-2 - Circuitry * Voice's VCF/VCA Circuitry
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Roland Alpha Juno-2 - D/A Converter - Image by Nikolaus Riehm
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)

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 * …

 
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