This a a modified UMR2 MIDI retrofit board specifically designed for use inside a Yamaha CS01 (I or II) without removing the speaker and requires a hole to be drilled for the TRS MIDI jack. The device has be simplified by removing connections not required for the CS01 so it CANNOT be used with other devices. It also features psiMIDI which means it can accept either 3.5 TRS A or TRS B MIDI cable
This is an DIY kit which includes:
- CS01 UMR2 PCB: Complete and preprogrammed with UMR2 firmware
- Ribbon cable, wires, TRS MIDI Jack
- 2m long TRS MIDI A Cable
Install Instructions:
Step 1: Ribbon cable Prep
- Strand out one end to 1.2 cm from where the cable is stripped
- Remove the insulation by gently pulling off the ends and tin the wires
- On the other side, simply remove the ends and tin, no stranding needed
Step 2: MIDI Board Prep
- Tin all pads with a small blob of solder on both adapter and CPU board
Step 3: CS01 board prep (CS01 II is the same)
- Trim the leads on the by the keyboard pads where shown
- Add fresh solder to the 12 pads, try to make them even in size
- Solder the DC+ and DC- wires where shown
Step 4: MIDI Board soldering
- Solder the ribbon cable starting with the middle 2 pins and work your way out. The red strip is pin D0
- On the solder adapter board solder the other end of the ribbon (not that D0 is not marked)
- Remove the ground tab from the TRS jack and solder on the wires
Step 5: CS01 Drilling/MIDI Jack.
- Drill an 8mm (5/16") hole where shown. A step drill is recommended. THIS IS A DELICATE STEP SO EXTREME CARE SHOULD BE TAKEN
- Install the MIDI Jack followed by the nut from the other side. Tighten with needle nose pliers. Apply sticker (cut in half first)
Step 6: Install the MIDI board
- Place the adapter board on top of the keyboard pins
- Solder the outermost pins to the pads below them and solder the rest. Test with meter if needed, those points correspond to the red and black wired below
- Remove the backing from the tape on the back of the adapter
- Route the MIDI wires in the gap between the keyboard and main board
- Stick the MIDI board where shown running the wires under the board with a 90 bend in the ribbon
- Solder the MIDI wires to the marked terminals THE ORIENTATION DOES NOT MATTER
- Solder the DC+ and DC- wires
Step 7: Calibration
- Connect TRS MIDI to your keyboard
- Turn the power switch on. While holding the program button down with something pointy but not sharp, plug the DC jack in. Release the pointy thing
- LED will flash. Press the F key on your MIDI keyboard on the octave you want the MIDI notes to trigger the CS-01 to start, THE MIDI WILL ONLY TRIGGER 32 NOTES FROM THAT F NOTE. Once the MIDI note is received, the device will pause to save and the LED will flash again
- Starting with the first key on the CS-01, you must play each not sequentially, after the note is received, the LED will turn red when the note is on, then green flashing again for the next note. Repeat for all notes
- When complete, press program again, LED will go red then go out
- Unplug device, and power up again
- Check all MIDI note work over the 32 key range, if any notes are missing, repeat the process
Original Design by John Staskevich, 2017
GitHub - staskevich/UMR2: Universal MIDI retrofit PCB for matrixed-switch keyboards.
Synths/UMR2CS01 at main · MichiganSynthWorks/Synths
This derivative work is licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/
