Repairs & Servicing

Keyboard Servicing.

If you are experiencing difficulties with your electronic keyboard, our highly qualified and experienced team at JMS electronics welcomes you for useful advice. Our Technicians specialises in servicing and repairing Yamaha, Roland, ALTO, PEAVEY, Hybrid, Leem, Korg etc. We are able to chat through with keyboard specialists and also have a listing of spares providers to follow through with your request.

Sometimes it may not be possible to repair your keyboard or organ. In this case, why not trade in your old keyboard with a new keyboard through us, we will advise you on the best keyboards for your specifications.

Amplifier Servicing

We specialize in amplifier servicing, restoration of old amps in need, amplifier cosmetics, hot rodding/modifications and de-modifications, cabinet speaker wiring, custom builds from scratch or kits, custom amplifier voicing and custom made cables for all solid state and tube amplifiers. If you have questions please feel free to contact us via email, phone or just stop on in to our shop! We are a full and dedicated amplifier repair & restoration shop.

We also service Digital Amplifiers and Guitar Amplifiers.

We build and sell Stereo, Monoblock, and Multichannel amplifiers to customer specifications.

Speakers Servicing
At JMS Electronics we pledge to give a great service, competitive pricing, speedy repairs, quality control and to ensure that your speakers are in excellent condition.

We recoil speakers to manufacturing specifications and replace or upgrade your speakers.

Our Services Include:

  • Replacing and repairing cross overs and amp modules
  • Recoiling to Manufacturer Specifications
  • All other repairs to all makes and sizes of speakers

Mixers Servicing

Mixing Desk Repairs

JMS Electronics can repair and service both digital and analogue mixing desks / recording consoles. We can supply spares from most major manufacturers.. Whether its a vintage Soundcraft analogue console, DDA or up to date budget desk we will provide a cost effective solution.

We accept consoles (flight cased) and compact desks by courier or by our pickup service. (Please ring for details) for service and repair at the workshop.

Typical Service of mixing desks include

  • Strip down board
  • Clean pot and faders, re-grease or replace as necessary
  • Clean fans and filters
  • Check PSU voltages are in tolerance
  • Tighten all connectors and reseat ribbon cables
  • Check inputs and Outputs for channels and subgroups
  • Clean all input connectors
  • Clean all inserts, group outs and matrix
  • Replace missing or defective lamps.
  • General clean of surface of desk.

If there are any other electronic faults we will notify you and quote for the repair of these problems. We can rebuild, repair or replace switch mode power supplies for most mixers.

Very old consoles may need more time / parts due to intermittent problems due to age, tarnishing of contacts etc. If you are unsure about faults we will take delivery and check the desk for operation and quote for all problems found outside of standard service procedures. To check and provide a report on the desk is R350 for rejected quotes (1 Hour)

Mixing desk upgrades: We are happy to modify your mixing desk by fitting better quality op amps, decoupling caps and gold plated sockets or connectors. Also upgrade of VU lights to LED in certain mixers is possible. Replacing channel and master op amps TL072 or NE3352 with burr brown devices for a more detailed sound. There are many mods for mixing desks and we are happy to carry these out as per your requirement specified.

  • Alesis
  • Allen & Heath
  • Behringer
  • Digidesign
  • Electro-Voice
  • Mackie
  • Peavey
  • Phonic
  • Pioneer
  • Roland
  • Samick
  • Samson Technologies
  • Shure
  • Soundcraft
  • Tapco
  • Topaz
  • Tascam
  • Yamaha
  • Leem
  • Hybrid


Roland South Africa

JMS Electronics has been subcontracted by Roland South Africa to service Roland and BOSS musical instruments in Gauteng Area.