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Roland Alpha Juno-2 Service Manual

Roland Alpha Juno-2
24 pages
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Roland Alpha Juno-2 Specifications

General IconGeneral
Polyphony6 voices
Keyboard61 keys
EffectsChorus
ControlAlpha Dial
Year Released1985
Oscillators1 DCO per voice (Sawtooth, Square, Sub-Oscillator)
LFO1 LFO (square, random)
Envelopes1 VCA envelope, 1 VCF envelope
MIDIIn, Out, Thru
Memory64 patches

Summary

SPECIFICATIONS

SERVICE NOTES

DISASSEMBLY PROCEDURES

Instructions for taking the JU-2 apart for servicing.

EXPLODED VIEW

Diagram showing all components of the JU-2 in an exploded view.

PARTS LIST

IC DATA

BLOCK DIAGRAM

CIRCUIT DESCRIPTION

CONTROLS READING

ROTARY ENCODER

Explains the function and operation of the rotary encoder.

SWITCHES

Describes how various switches are read by the CPU.

CHECKING AND ADJUSTMENT

BASIC SYSTEM CHECKS

Power supply, LCD, and RAM checks, plus RAM initialization.

TEST MODE

Details on entering and using the instrument's test mode.

FUNCTIONAL CHECKS

Procedures for VCF, DCO, and HPF checks.

AUDIO AND PERFORMANCE CHECKS

Verifies output levels, dynamics, and aftertouch effects.

BOARD SCHEMATICS

MIDI IMPLEMENTATION

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