Lexicon 300 v3.5 Firmware Conversion EPROMs to 300L v3.5L

The availability of clones of the Lexicon LARC remote control elsewhere on eBay has raised interest in whether it is possible to convert the Lexicon 300 (with front panel controls and display) into a 300L controlled by a LARC. The benefits of doing this are that the 300L has a wider range of algorithms and factory patches, plus editing is somewhat easier via the LARC.

This conversion certainly is possible and is quite straightforward to do, requiring two firmware chips to be swapped for new devices. This listing is for the two new parts that are required. You will also need a crosshead screwdriver to remove the lid and either an IC extractor tool or a flatbladed screwdriver to gently remove the old chips from their sockets. No soldering is required.

Before purchasing, please read and understand the following:

  • This conversion kit assumes that your Lexicon 300 is already running the latest v3.5 firmware. If you are running an earlier version then it needs to be brought up to the latest version first - please contact us for details.
     
  • Fitting the 300L firmware will disable the front panel controls and display on the unit (it will show a message indicating "LARC operation only"). There is not, and never was, a version of firmware that allows use of both a LARC and the front panel controls simultaneously.
  • All Lexicon 300s have the socket to connect a LARC but the majority do not supply it with power. The easiest solution to this is to use an external "wallwart" power supply for the LARC (Lexicon LARCs have a socket for this - clones may or may not). Alternatively, a simple internal modification may be made to link power to the LARC socket.

If anything is unclear, ask for advice before purchasing. We specialise in vintage Lexicons and know them pretty well :-)

Thanks for looking - please feel free to email with any questions.

Payment (UK pounds only please) may be by internet bank transfer (preferred) or PayPal. For international sales, only PayPal is accepted. All sales are final and shipment will be made once funds have cleared.

This is a business sale and UK VAT at 20% is included in the price.