Tubbutec OrganDonor Korg Polyphonic Ensemble PE-1000 Installation Guide
- October 30, 2023
- Tubbutec
Table of Contents
OrganDonor Korg Polyphonic Ensemble PE-1000
Installation Guide
OrganDonor Korg Polyphonic Ensemble PE-1000
Tools you will need:
- Soldering iron
- Wire stripper
- Metal drill 3.5mm (or similar)
- Metal drill for a 15mm hole (stepping drill for example)
- Center punch
- Screw driver
Included in the kit:
- OrganDonor Main Board
- 4x organ Donor Switch Board, 2x16pin connector, 2×20 pin connector
- Analog switch connection: 1×20 – 35cm, 1x20p – 28cm, 1×16 – 38cm, 1×16 – 55cm
- Interconnect cables: 1x 16cm, 1x20cm, 1x 6cm, 1x 5cm
- Midi connector assembly
- Power connector
- Learn button
- 16x screw 6.5mm
- Midi socket drill guide
- 2x M3 bolt, 2xM3 nut for midi socket
- 2x 10k resistor for Filter control
Principle of operation
Organ Donor uses analog switches to simulate keyboard presses directly. Normally this would require to solder two wires for each key. Luckily this can often be avoided by grouping common signals. Organ Donor features solder jumpers to connect common signals on the back of each analog switch board. We already connect these jumpers for you.
The PE-1000 has 60 keys. The keyboard is constructed from 10 key blocks. The
first key block consists of 7 key contacts and 1 common contact, the other
keyblocks consist of 6 key contacts and 1 common contact each. The sixth key
contact of the last key block is not used.
The keyboard uses 2 common contact busses, 1 for the lower keyboard part (25
keys) and 1 for the upper keyboard part (35 keys). On the keyboard itself the
common contacts are connected via jumper wires.
Installation
First place the main board and the 4 switch boards inside the Synthes case,
see picture.
The main board gets placed to the left of the filter board, the 4 switchboards
to the bottom of the case.
Use the 2,9×6,5 screws for this.
Then connect the main board and the switch boards with the interconnection
wires.
Power connection
You need to extend the supplied wire assembly for the power connection.
Connect V+ (red wire) to the point marked with a green circle in the picture.
Connect Gnd and V- black and yellow wires) to the points marked with a red
square in the picture.
Installing the key connections
Cut the ribbon cables to length and strip the wires.
Switch board 1:
The first wire of the 20 wire ribbon cable gets soldered to the common contact
of the first keyblock.
Wire 2 gets cut.
Wires 3-18 get soldered to the first 16 key contacts. Be careful not to
desolder the internal wires.
Wires 19 and 20 get cut.
Solder the common wire to the contact marked green in the picture. This is the
first common contact in the first keyblock, a blue wire connects it to the
other common contacts. The common contacts are squeezed between the normal key
contact, so they are recognized easily.
Switch board 2:
Wires 1 and 2 get cut.
Wires 3–18 get soldered to key contacts 17–32.
Wire 19 gets cut.
Wire 20 gets soldered to the common contact of keyblock 5
Solder the common wire to the contact marked green in the picture. This is the
first common contact in the fifth keyblock, a green wire connects it to the
other common contacts.
Switch board 3: Wires 1-16 get soldered to key contacts 33- 48.
Switch board 4: Wires 1-12 get soldered to key contacts 49-60.
Installing the midi socket
You can either drill a hole in the back of the PE-1000 and install a Midi
socket, or you can remove the Traveller Control jack, but leave all the
connections intact. Put the jack in a plastic bag and secure it inside the
synth. Now just install the MIDI jack where the Traveller Control jack was
located. In this case you don’t need to drill a hole and can easily restore
the synth to its original state. The MIDI jack connects to the main board, you
need to extend the wires.
Installing the learn button
The optional learn button can be used to set midi channel. It needs to be connected to the IO “2” and “G” pin on the main board. (The back of the main board has labels on it). Wires are not included in the kit. Press the learn button and while it is pressed send a midi note on any midi channel. Organ Donor will use this midi channel from now. These settings are saved.
Glide control
For Glide Control solder a wire to the OC1 (OC=open Collector) pad on the main
board.
Solder this wire to the place marked in green in the picture (solder to purple
wire). MIDI CC23 turns Glide on and off.
Connection for Glide control on main board marked in green.
Filter control
For Filter Control solder 2 10K resistors to OC3 and OC4 pads on the main board. Solder two wires to these resistors. Solder these wires tothe wipers of the filter slide pots. OC3 HPF, yellow wire, OC4 LPF, grey wire. Solder 100nF ceramic caps between the wipers and ground.
Solder a 10K resistor to the pad marked in green for HPF control. MIDI CC25 controls the HPF.
Solder a 10k resistor to the pad marked in green for LPF control. MIDI CC26 controls the LPF.
This is how the main board looks like when finished.
Configuration
We already flashed the corresponding configuration file to Organ Donor. There
is, however, a software configuration tool available, in case you want to play
around with settings and key assignments. You`ll find the configurator here:
https://tubbutec.de/files/organDonor/
tubbutecOrganDonorConfigurator.html
This is a browser application, it works with Chrome and Safari right away,
Firefox needs to be configured for web MIDI.
The configurator allows you to upload your settings directly from your browser
to Organ Donor, safe and load settings and export settings as SysEx files for
uploading to Organ Donor via another SysEx tool.