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Ensoniq

Ensoniq VFX

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

Faemi 1M

Godwin

Godwin Symphony 849

Jen

Jen SX-1000

I have two units of these little machines.
Another machine based on the M110 B1 monophonic synthesizer chip from SGS.
Kawai

Kawai K5

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

Kawai

Kawai R-50e

Kawai

Kawai R-100

You should check my 8 bank switch
Kawai

Kawai SX-210

Keytek (Siel) CTS-2000

This machine used a M114S Digital Sound Generator chip by SGS but the filters were analog Curtis CEM3389 like 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 Delta DL-50

Common problems:
-Filter capacitors
-Ensemble board: MN3004, capacitors.
-S10430 AMI divider-keyer
Korg

Korg DW-6000

Korg

Korg DW-8000

Korg

Korg EX-800

Korg

Korg Karma

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

Korg M1

Korg micro-preset M-500

Korg

Korg Mini Pops 7

Korg

Korg MS2000R

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

Korg Poly 800

I have also the inverted keys version
Common problems: battery leak
Korg

Korg Poly 800 II

Korg

Korg Poly-61

Korg

Korg Polysix

Korg

Korg Wavestation EX

Korg

Korg Z1