Roland JUNO-106 Service Manual

JUL. 31, 1984
JUNO-106
SPECIFICATIONS
KEYBOARD 61 keys, 5 octaves, C scale
Dco
TUNE +50 cents
LFO MOD. +400 cents
BENDER +1200 cents
VCF
CUTOFF FREQ. 5Hz to 50kHz
RESONANCE 0 to self oscillation
ENV MOD. +14 octaves
LFO MOD. +3.5 octaves
BENDER +3,5 octaves
KEY FOLLOW +3/—2 octaves
i=Roland
Side panel (left)
(21125190)
Bracket
(22125519)
LED Display window
(22245511)
LED LB-602VA2-1
(15029175)
Bender panel (22215722)
SN 435500-up (22215722A)
PORTAMENTO ON/OFF Switch
mounting hole ---- SQUARE
(Compatible, see Parts Notes)
Bender ass’y
PB-9 (23275751)
JUNO-106
SERVICE NOTES
ENV
ATTACK TIME
DECAY TIME
SUSTAIN LEVEL
RELEASE TIME
LFO
RATE
DELAY TIME
AUDIO OUTPUT
DIMENSIONS
WEIGHT
First Edition
1.5ms to 3s
1.5ms to 12s
0 to 100%
1.5ms to 12s
0.1Hz to 30Hz
0 to 3s
L: —30dBm; M: —15dBm;
H: OdBm
992(W)x320(D)x120(H)mm
39-1/16 (W)x12-5/8(D)x
4-11/16(H) in.
10kg/22 Ib.
POWER CONSUMPTION 25W (20W--100V)
Side panel (right)
(21125189)
Bracket
(22125519)
Top panel (22215408)
Keyboard
SK-361GR (76139200)
Printed in Japan B-3 1
CPU board
(76139140)
Power board
100/117V
(76139121)
220/240V
(76139124)
Panel
board
(76139320)
Jack board
(76139350)
MIDI board
(76139380)
Screw
:
Ve
Screw
M3x12
A
:
M3x12
Fe
Br
2
pcs,
;
S
Fe
Br
2
pcs.
Bender board
{not shown)
(76139410)
Fuse board
100/117V (76139111)
Blind
(22235320)
220/240V
(76139114)
Module board
(76139170)
Power transformer
(22455371U0)
Slide
switch
400/117/220/240V
SSP323-12N (13159334)
Power switch
WK2A44 3A (13149108) or
1801-0121 (14149102)
Jack (stereo)
HLJO520-01-010 (13449126)
AC inlet
PA126 (13429710) 117/220V
PA125 (13429709) 240V
DIN socket (triple)
MIDI 3-NS (13429168)
Jacks (mono)
HLJ0520-01-110 (13449125)
Rubber
foot
G-5
(15mm
or
0,6
in.)
or
G-7
(40mm
or
0.4
in.)
(12359104)
(12359105)
Four feet should be of the size to rest the unit level.
Cabinet
(21135130)

Roland JUNO-106 Specifications

General

Type	Analog
Polyphony	6 voices
Effects	Chorus
Keyboard	61 keys
Memory	128 patches
Year Released	1984
Oscillators	1 DCO per voice
LFO	1 LFO
Envelopes	1 x ADSR envelope

Summary

Service Notes

Specifications

Technical parameters of the JUNO-106 synthesizer, including key, LFO, VCF, and audio specs.

Component Layout Diagrams

Visual identification of main components and their physical locations on the unit.

Block Diagram

System Signal Flow

Illustrates the interconnection and signal paths between major internal boards.

Module Board

Parts Designation and Pinouts

Lists components on the module board and their pin functions for reference.

Oscillator and D/A Converter Circuits

Details the OSC, DCO, and D/A converter circuitry and timing charts.

Circuit Details

Waveform Generation ICs

Explanation of MC5534A ICs for generating different waveforms.

Integrated Circuit Information

Provides data sheets, block diagrams, and pin configurations for key ICs.

VCF and VCA Circuitry

Description of the Voltage Controlled Filter and Amplifier circuitry.

Board Overviews

Panel Board Diagram

Diagram and explanation of the panel board, including controls and indicators.

CPU Board Diagram

Diagram and explanation of the CPU board, the synthesizer's central control unit.

Parts Designation List

Component Cross-Reference

Lists component designations and their corresponding part numbers for service.

Adjustment Procedures

Power Supply Voltage Checks

Verification of DC supply voltages on the power supply board.

DCO CV Offset Adjustment

Setting the DCO control voltage offset for accurate pitch.

VCA Bias and Offset Adjustments

Fine-tuning VCA bias and offset parameters for proper volume control.

VCF Resonance and Gain Adjustments

Setting VCF resonance and VCA gain levels for sound shaping.

VCF Frequency and Width Adjustments

Tuning VCF frequency and width parameters for tone control.

Noise Level and PWM Adjustments

Setting noise level and pulse width modulation (PWM) for timbre.

Chorus Bias and Load Offset

Adjusting chorus bias and load offset values for audio output.

MIDI Function Switch Check

Verifying functionality of MIDI control switches.

Board Diagrams and Layouts

Module Board Layout

Component layout and wiring for the module board.

Jack Board Layout

Component layout and wiring for the jack board.

Bender Board Layout

Component layout and wiring for the bender board.

Fuse Board Layout

Component layout and wiring for the fuse board.

Power Supply Board Layout

Component layout and wiring for the power supply board.