BustedGear.com
Shop 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
• re-cap
SUPER TWIN
• intermittent volume
Kay
703-C
• re-cap
Marshall
DSL100
• choke & o.t. install
Peavey
6505+
• tube filaments
CLASSIC-30
power resistor
Selmer
LITTLE GIANT MK 3
• loose transformer
Vox
AD50VT
• power resistor
VALVETRONIX
• pot replacement
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
KRONOS
• key clacking
M1
• worn-out buttons
POLY-61
• envelope problems
• battery upgrade
TRITON
• disassembly
TRITON
• worn-out buttons
X3
• floppy drive belt
X3
• worn-out buttons
KEYS & CONTACTS
• m1, 01w, i2, i30, t3
• triton, trinity, oasis...
Kurzweil
PC88
• worn-out buttons
M-Audio
KEYSTATION
• broken USB jack
Moog
MICROMOOG
• dirty keys & controls
contour problems
• calibration & tuning
MINIMOOG
• key bushings
PRODIGY
• key contact cleaning
ROGUE
• broken power jack
Roland
D-50
• key contact cleaning
TR-808
• cracked ribbon cable
• worn-out switches
• new battery holder
JUNO-60
• battery upgrade
• key contacts
Sequential Circuits
PRO-ONE
• key contact cleaning
Vox
CONTINENTAL
• key contact cleaning
• drawbar problems
• new panel switches
Yamaha
MOTIF 6 & 7
• disassembly
MOTIF 6 & 7
• worn-out buttons
SY77
• battery change
KEYS & CONTACTS
motif 6/7, w5, kx76,
• dx7, sy77/85/99 ...
Technique
• IC Sockets
• Phone Plugs

Korg® Poly-61M View
the
Repair
Envelope Repair - Battery Change
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       |       Repairs       |       Manufacturers       |       Resources       |       IFAQs       |       About

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