Tubbutec OrganDonor User manual

Tubbutec OrganDonor
Installation manual for Roland RS-505
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
•5x organ Donor Switch Board, 3x 16pin Connector, 2x 20pin
connector
•Analog switch connection:
Switch 1 16pin, 40cm
Switch 2 16pin, 45cm
Switch 3 20pin, 45cm
Switch 4 16pin, 45cm, wire 1 extended to 75cm
Switch 5 20pin, 40cm, wire 1 extended to 64cm
optional 16pin header on switch board 5, 120cm
•Interconnect cables: 1x 8cm, 2x 14cm, 1x 22cm, 1x 45cm
•Midi connector assembly
•Power connector
•Learn button
•2 resistors (1K, 47K , 1 capacitor (100nF
•19x screw 2,9x6.5mm
•Midi socket drill guide
•2x M3 bolt, 2xM3 nut for midi socket

Principle of operation
OrganDonor 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. OrganDonor features
solder jumpers to connect common signals on the back of each analog
switch board. We already connect these jumpers for you.
In the case of the Roland RS-505 there is one common signal for the
String section (all 49 keys , and one common signal for the bass section
(lower 24 keys . This allows for different configurations: you can trigger
the keys via one MIDI channel (strings and bass at the same time , or
you can split MIDI channels, for example MIDI channel 1 for the strings
and MIDI channel 2 for the bass.

Board installation
Mount the main board and the 5 switch boards directly to the bottom of
the synthesizer case under the keyboard using the supplied 2,9x6,5mm
screws.
Please note: the order of the boards is as followa:
main – switch 1 – switch 4 – switch 2 – switch 5 – switch 3
The boards are marked on the backside, so make sure they are in the
correct order. We installed them in this order to reduce cable length for
the bass connections.
Please take also care that you connect them in the correct order, using
the interconnection cables: main – s1 – s2 – s3 – s4 – s5

Install the interconnection cables and the switch cable assemblies.
Take care of the order of connections.
Cut the cables to length and strip the wires.
Solder the wires to their respective points on the pcb, take care not to
desolder the internal wires.
Switch board 1:
Wire 1 - 16 get soldered to the lower row of key contacts to contacts
1 – 16.
Switch board 2:
Wires 1 - 16 get soldered to the lower row of key contacts to contacts
17 – 32.
Switch board 3:
Wires 1 gets soldered to the common bus of the synth/string section
(orange wire .
Wire 2 gets cut.
Wires 3 - 18 get soldered to the lower row of key contacts to contacts
33 – 48.
Wires 19 and 20 get cut.
Switch board 4:
Wire 1 (the extended one gets soldered to key contact 49 of the lower
row of key contacts.
Wires 2 – 16 get soldered to the upper row of key contacts to contacts
1 – 15.
Switch board 5:
Wires 1 (the extended one gets soldered to the common bus of the bass
section (black wire .
Wire 2 gets cut.
Wires 3 – 11 get soldered to the upper row of key contacts to contacts
16 – 24.
Wires 19 and 20 get cut.

Optional 16pin header of switch board 5
There are 7 switch contacts left, so we choose to use 6 of those to switch
the registers of the synth section on and off via MIDI CC.
To do that you simply have to solder 2 wires each to the switches.
Wires 1 and 2 get cut.
Wires 3 and 4 get soldered to the Bass 16`switch (CC#85 .
Wires 5 and 6 get soldered to the Bass 8`switch (CC#86 .
Wires 7 and 8 get soldered to the Lower 8`switch (CC#87 .
Wires 9 and 10 get soldered to the Lower 4`switch (CC#88 .
Wires 11 and 12 get soldered to the Upper 8`switch (CC#89 .
Wires 13 and 14 get soldered to the Upper 4`switch (CC#90 .
Wires 15 and 16 get cut.
To use these the hardware switches must be turned off.
Then you can switch them on and off via MIDI CC#85-90.

Power connection
Install the power connection wire assembly as follows:
The red wire gets soldered to +15V on the bottom side of the power
supply pcb. This is the connector on the left, with the red wires being the
+15V connections.
The black wire gets soldered to the ground connection (marked E on the
bottom side of the power supply pcb. This is the connector to the right,
with the black wires being the ground connections.
The yellow wire gets soldered to -15V on the bottom side of the power
supply pcb. This is the connector in the middle, with the blue wires being
the -15V connections.

Installing the MIDI socket
Drill the holes for the MIDI jack directly above the power inlet and install
the MIDI wire assembly.
Installing the optional 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. OrganDonor will use this midi channel from now. These
settings are saved.

Installing the optional Filter ontrol
It is possible to control the filter cutoff via MIDI.
To do so you need to install the included resistors and capacitor as
follows:
Solder one leg of the 1K resistor to the PWM1 connection (The back of
the main board has labels on it .
Solder one leg of the 100nF capacitor to a ground connection of the main
board. Solder the second leg of the capacitor to the other leg of the 1K
resistor.
Solder a wire to the connection of the 1K resistor and capacitor.
Solder the 47K resistor to the 4th pin from the right of the 6pin connector
of the filter control board.
Solder the wire coming from the 1K resistor to the 47K resistor.
Now you can control cutoff via MIDI CC# 23.

onfiguration
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.