Poly Digital Synths
!
Alesis

Alesis Micron

Arturia

Arturia Origin Desktop

Common Problems:
-Big knob - skipping values
-Power supply - no power

Casio

Casio CZ-1

Casio

Casio CZ-1000

Casio

Casio HT-6000

Casio

Casio XW-P1

Underrated machine. Will never be loved because of the name CASIO.
Common problems:
-None that I know
Elka

Elka EK44

Some say that Elka managed to get Yamaha FM operator YM2203 to their EK44 by pretending to be a Arcade games developer...
There might be some veracity in this story because the Yamaha chips part numbers are sanded and replaced by a simple G1 and D1!
Ensoniq

Ensoniq ESQ-1

Common problems:
-Battery
-Rust (metal chassis version). Actually, the rust starts in the screws.
-Display/keypad controller (Rockwell R1121-11)
Ensoniq

Ensoniq VFX

Usually you have to change the battery. Also problems with keyboard connection. The last firmware released is version 2.30.

Farfisa MARS (Musical Audio Research Station) MkI

The Farfisa MARS was produced by IRIS Bontempi Farfisa group.

Apparently, my unit is one of 4 or 5 commercial units ever sold. There's an fantastic article about the MARS in the webpage of musician Jochen Bohnes.

Kawai

Kawai K5

Additive synthesis. I also have the Seiko DS-202...

Keytek (Siel) CTS-2000

This machine used a M114S Digital Sound Generator chip by SGS but the filters were analog Curtis CEM3389 like in the Sequential Prophet VS.
Korg

Korg 01/W

My first synthesizer. Bought it in 1992, new. I still have the original box, manuals and everything.

Common problems:
-battery (CR2032)
-electrolitic capacitors
-display illumination
-sticky keys

Last known OS Version #62
Korg

Korg DW-6000

Korg

Korg DW-8000

Korg

Korg Karma

Brilliant machine. I have the EXB-MOSS board installed.
Korg

Korg M1

Korg

Korg MS2000R

A common problem is the DSP. It fails and you don't have any sound from the synth.
Korg

Korg Wavestation EX

Korg

Korg Z1

Kurzweil

Kurzweil K2000RS

The display illumination tend to fade.
Kurzweil

Kurzweil PC3LE6

Novation

Novation Supernova II Keyboard

Common problems:
-DAC
-Data encoders
-Push buttons (especialy voices selection)
-Rust is also frequent
Novation

Novation X-Station 25

Yamaha

Yamaha DX-7 II FD