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, set the footing on the CS to 32 (IMPORTANT)
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/

DIN Socket, TR-606/MC-202 Replaces Roland PN 13429607

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