Many thanks to Jonathan Williams for providing the instruments, support and enthusiasm to drive these projects. OLED display manufacturers generally only supply in large volume. These two derivatives will allow increased purchasing volumes for the OLED display thus maintaining supply of the original JX10 and MKS70 OLED kits.
D50, DX7IIFD, DX5 OLED Displays
This is the same display as used in the JX10 and MKS70 OLED kits.
Instruments require de-soldering and soldering plus front panel disassembly.
Completed and available here.
JX-8P OLED Display
A spin off from the JX-8P Vecoven Flash project and JX-10 replacement display, it is intended to work in conjunction with Vecoven upgrades for full effect. Compatibility will be provided for other firmware in one line mode.
The picture above is from some concept work done by Guy Wilkinson and Jonathan Williams. It just shows the “Splash screen” for JX10 for basic testing of what is possible with the window, apologies to Fred for cutting off his name, see second picture!
Development is underway, but note that it is a huge amount of effort producing a product like this with construction/fitting guides, software and custom display arrangements. The mechanical design is especially difficult due to very precise tolerance and limited space behind the bezel, it needs to look straight whilst being easy to fit.
September – significant progress made:
- Test software written that exercises every function and performance of the original Roland design
- Specification written that describes all the technical details including timing & commands
- Test set updated to test production displays
Power Supply Overvoltage Protection Measures
A number of reports are coming in where power IC M5230L reference circuit fails. When it does, it puts 44v across the analogue circuits and 7v on the logic causing damage.
A couple of component additions to existing PSU are being worked out using additional components to try and limit damage.
MKS 70 Gate Array Replacement
A spin off project from above when debugging a faulty MKS 70 at Plasma Music.
A PCB has been designed that replaces obsolete components on the assigner.
It also means that reliability of the MKS 70 is better assured and could be a donor instrument to fix a JX 10.
To help debug faults before changing the IC, some gate array test software is being written.
An EPROM can be installed that runs tests on the gate array functions and reports where faults exist either through bad connection, external RAM or IC itself.
August: Sample PCBs ordered ready made from PCBway!
September: PCB samples ready & donor MKS70 arrived for testing
Xvive Audio Chorus Chip Trial
Spotting the tell tale signs of noise and periodic interference of old devices followed by a test of the Xvive Audio chip to replace the Mitsubishi BBD IC MN3009.
Article will show replacement of the devices in a SuperJX.
Completed and can be seen here.
Copyright © 2020 Super Synth Projects, Guy Wilkinson