Roland JV-90 Repair
Customer states patch data corruption while in use which lead to weird sound all over the place.
ddzheng
Roland SR-JV80 Re-writable ROM Card with ESP32
For user manual and purchasing please visit: https://www.ddzheng.cc/?page_id=666 Final Update Open-source Hardware Hardware Repo: https://github.com/connorzheng97/srjv Firmware Repo: https://github.com/connorzheng97/srjv-fw Production Test For production test I have a contractor made a test fixture which probe the production header footprint from top side. The card is placed upside down in the fixture, a small board with mating expansion ... Read More
Roland XP-80 LCD Replacement
Final modification for my XP-80, and you can do this as well. Should apply to JV-2080 and XV-5080 as well.
Korg Triton Repair and Restoration
A long time viewer of my Bilibili channel contacted me to do a restoration of his Korg Triton.
Tektronix DPO71254B Repair
There is a DPO71254B at my workplace that has been abandoned for quite a while. I repaired it so that we can use it to debug (no cal though)
Roland D-50 Repair
The long journey of restoring a Roland D-50
Oscilloscope Measurement Artifacts 1
In this article I present some aspects that distort electrical signal measurement result, with focus on what happens in the scope itself after the signal has entered an oscilloscope.
Custom Logging to Console and File Handling in Python (with Queue)
This one uses queue so there is no performance bottleneck on the logging calls.
Repair SONY DSC-P93
Repair a SONY DSC-P93 that has stuttering OVF zoom and an error message
Resurrecting AGM Lead Acid Battery
Although not regular flooded type, AGM batteries can also be restored by adding water if it's not too far gone.