BustedGear.com
Shop DIY Repairs Manufacturers Resources IFAQs About
DIY Repairs
Amps
Ampeg
SVT CLASSIC
- shuts off
SVT-VR
- won't balance
Fender
DEVILLE
- bad input jack
MINI-TWIN
- convert to stompbox
PRINCETON 5F2-A
- filter cap replacement
SUPER TWIN
- intermittent volume
Kay
703-C
- filter cap replacement
Marshall
DSL100
- choke & o.t. install
Peavey
6505+
- tube filaments
CLASSIC-30
- power supply resistor
Selmer
LITTLE GIANT MK 3
- loose transformer
Vox
AD50VT
- power resistor
Keyboards
Akai
MPC2000XL
- bad jog wheel
E-Mu
VINTAGE KEYS
- broken volume pot
Ensoniq
SQ-2
- battery change
Farfisa
MINI COMPACT
- divider problems
Korg
01/W
- keybed removal
KARMA
- key contacts
M1
- worn-out buttons
POLY-61
- envelopes & battery
TRITON
- disassembly
TRITON
- worn-out buttons
X3
- floppy drive belt
X3
- worn-out buttons
KEYS & CONTACTS
- m1, 01w, triton, i30 ...
Kurzweil
PC88
- worn-out buttons
M-Audio
KEYSTATION
- broken USB jack
Moog
MICROMOOG
- multiple issues
MINIMOOG
- replace key bushings
PRODIGY
- key contact cleaning
ROGUE
- broken power jack
Roland
D-50
- key contact cleaning
TR-808
- multiple problems
JUNO-60
- key contacts, battery
Sequential Circuits
PRO-ONE
- key contact cleaning
Vox
CONTINENTAL
- multiple issues
Yamaha
MOTIF 6 & 7
- disassembly
MOTIF
- worn-out buttons
SY77
- battery change
KEYS & CONTACTS
- motif, dx7, sy85 ...
Technique
Installing IC Sockets
Soldering Phone Plugs
Korg® Poly-61M    Envelope Repair - Battery Change
View the Repair   >
Korg Poly-61 Front Panel

Korg released the Poly-61 in 1982 and the Midi version ("61M") in 1984.  The Poly-61 was the successor to the Polysix.  Both are 6-voice synths but the Poly-61 has 2 oscillators per voice instead of one.

Voice 1 is a true analog oscillator, digitally controlled, while voice 2 is a simple digital counter that clocks at audio frequencies.

The Poly-61 has an x-y joystick instead of wheels for it's pitch bend and modulation functions.  It has the same arpeggiator feature as the Polysix.

 

Korg Poly-61 Data Entry Display

The Poly-61 launched one-parameter-at-a-time data entry.

Three, 2-digit LED displays are used to select program numbers, parameter numbers, and parameter values.

In this Repair Story, we tackle a unit that would only produce short, click-like attack envelopes.  Attack and decay settings had no effect.

You'll see how to take apart the synth, troubleshoot the envelope circuits, and replace the bad parts.

View the Repair   >
Korg Poly-61 Troubleshooting
Korg Poly-61 Rear Panel
View the Repair   >

Korg® is a registered trademark of  KORG Inc.

Shop       |       DIY Repairs       |       Manufacturers       |       Resources       |       IFAQs       |       About

Page design and content Copyright © Richard Diemer - All rights reserved