• Woody

    Got one from the eBay for $200.
    * I refurbished sliders, which turned out pretty well.
    * Floppy reader was good, but had to order the disk with system.
    * Relay is a problem, will need to be replaced.
    * S-50 refused to boot time to time or went dead in the middle of playing. Found that EPROMs lose contact with socket and pins needed to be cleaned. Then OK.

    * Several keys were either dead or didn’t play at times, so I put the thing apart and meticulously cleaned each and every contact traces and a PCB from dust and other dirt particles. And guess what, after putting the thing together again, three of the keys in the upper register went completely dead. From the schematic I deduced that these keys sit on the same wire, so started looking for lose connectors or other disconnections. And then there it was, a heritage of some wild party of the past, corroded copper traces after some kind of drink spillage or something. I must have cleaned them previously with alcohol and didn’t notice it’s a corrosion and actually made things worse. This was on a keys PCB for higher notes. Easy fix and all notes now play well.

    Still wondering if there’s any issue which will pop up.

    January 26, 2020
    • Darryl Schmitz

      I just did an easy fix for the relay. I soldered a jumper to the top of Pin 10 across to Pin 11 on the other side. This solidly connects the Main Output jack. There is a pop at startup, but if the volume on the mix board or amplifier is turned down, it makes no difference.

      October 23, 2021
  • amsynths

    I have a new relay board if you need one.

    January 26, 2020
    • Christophe

      hello, still sell it ? thanx

      June 06, 2020
  • Jon

    Mine will only load and boot from the floppy drive after being left on warming up for 5-10 minutes. Once warmed, it loads discs fine. I last replaced the drive with a Roland spare about 20 years ago, but have dealt with the new drive issue for 15 of those years. My guess is a bad solder joint somewhere, but where?

    June 12, 2020
  • Syd

    I believe the S-50 was actually released sometime late 1986 (likely sometime August – September) because it was announced at Musikmesse Frankfurt show in about April 1986, and reviewed in SOS magazine and Music Technology magazine in December 1986 issues, where magazine lead times are often three months (meaning the reviews of production units were written in September 1986 or so) . Most sources online also state the S-50 was released in 1986. However, it’s clear the S-50 was rushed to market because many of its promised features and functionality were not actually available until the OS 2.0 update in 1988.

    July 24, 2021
  • Dave

    Hi, I am looking for one of the relay pcb replacement boards for my S50. Do happen to have one available for sale? Thanks for posting this helpful article.

    August 27, 2021
    • amsynths

      The PCB’s can be ordered from OSHPark
      Order from OSH Park

      Best Regards

      August 31, 2021

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