Korg 800DV / Univox Maxikorg MIDI kit installation manual Rev A03.2
This retrofit only for key triggering through MIDI. Note ON/OFF only. It is limitation of base platform that used on this kit.
Welcome to the metric system zone. Here we work with precision things and all dimensions are metric. 1" = 25.4mm. Read instructions twice before start doing anything.
Installation:
To your good usability experience select the friendly place to mount the LED indicator, MIDI connector, button and PCB. The MIDI jack and pushbutton can fit near jacks at rear panel. Activity indicator can be placed on top panel near the power switch. Drill all holes that required and mount connector, Indicator and button of course before soldering wires.
Drill dimensions:
MIDI jack (DIN5) = 18mm.
LED holder = 6mm.
Push button = 12.5-13mm.
Be careful with drilling hole for push button, it have so small range to get hole too big. See below dimension ranges from their datasheet. Drill a bit less and file it to fide fitting.
Board dimensions and distance between screws in millimeters:
Do not allow the board to bend, it can break the board.
All ribbon cables are 90cm. long, enough for placing all connections and you can cut extra length. Reset "Panic" button is not included in the kit. If you prefer to install it part number is E-Switch RP3502MABLK
This picture shown:
First (1) pin/wire on all connectors. First wire will be start from this side.
J1, J2, J3, jumpers that divide common rails should be close. 
Bottom side jumper J5 should be close
The next picture shows the pinout for X6 connector ribbon cable and pin number of wires: Same you can see on bottom side of PCB for more convenience.
Ribbon cables pinout for better visual understanding. Even if wires go out on opposite side of connector, it still on same sequence - wire 1 at down or right on face to you. DIN5 shoved from legs side.
Wires 7 (V+) and 8 (GND) should be soldered on the next points at power supply board:
Negative power rail have less voltage on this synth and MIDI kit is connected to it. Board have lineal voltage regulator that drops voltage to 5V. Pay attention! MIDI board ground will be on approx. -15V potential relative to synth ground. Do not connect both "ground" together.
So, now is time to soldering key contact wires: Here's pinout legend for 14 pin ribbon cables.
X5 unused on this synth, but still active and have range F7-F8. It can be used for some mods in future that not described yet.
Solder wires to key contacts and common bus: Find key contacts for note F (Fa) on the first octave and solder wires from the X1 (Yellow) connector. Starting from wire 1. When you finish it, your last wire will be 12 and note E (Mi) on this octave and two unused wires. Repeat all this on every octave.
On X4 (Purple), also start from wire 1 - F (Fa). Skip wires that marked "skip" on table. Wire 13 from X4 connector should be soldered to common key contact bus.
One small important thing - use hot glue to fix inserted connectors to protect from disconnecting them during vibration when you ride on tour. Also fix wires strong. Do not leave them holding only on soldering joints.
Process for set MIDI channel: User operations:
1. Stop all MIDI traffic.
2. To teach with which MIDI channel synth will work - push the black button (LEARN) LED will blink two times and stay ON to wait for MIDI messages at one of 16 channels. It says taht board in OMNY mode, but only for settings.
3. Send any note on the MIDI channel that you want for this synth.
4. When the synth receives MIDI messages, LED will blink five times and turn OFF. It indicates that channel was received and saved. Then will ON with every NOTE ON messages on the selected channel.
5. Now the channel saved to memory and will never change before you push LEARN button again and starts settings process again.
In case of panic: Stop MIDI traffic on working channel. Push reset button (if installed) or turn ON/OFF the synth. For mode button control is enough to send short MIDI note once for enable/disable.
At moment when synth power on all keys will be sound. If on this moment MIDI commands will received on saved channel it can be cause of panic.
Last update: 25 January 2026.
