Tubbutec OrganDonor Siel Orchestra 1 User manual

Tubbutec OrganDonor
Installation manual for Siel Orchestra 1 / 2
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 OrganDonor Switch Board (1 single), 2x16pin Connector,
1x20 pin connector, 1x 2pin connector
•Analog switch connection: 1x20p – 45cm, 1x16p – 40cm, 1x16p –
35cm, 1x2 - 25cm
•Interconnect cables: 2x 6cm, 2x 17cm
•Midi connector assembly
•Power connector
•Learn button
•15x screw 2,9x4,5
•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 Siel Orchestra 2 there is one common signal
Note: We didn’t have a Siel Orchestra 1 in our workshop, but according
to the schematics the Orchestra 1 is built similar to the 2 Maybe you
have to adapt the placement of the switch boards, but electrically it’s the
same as the Orchestra 2
Preparation
After the first batch of OrganDonor we decided to consolidate different
synthesizer models in one kit where reasonable
That means that there might be more screws than needed for your
model, or the wires are too long, or there might even be a wire assembly
you don’t need for your installation So don’t get confused
But most importantly this also means you have to solder the shrouded
headers to the switch boards, and solder the little jumpers on the
backside of the switchboards
Here’s how to do it:

Switchboard 1
20pin Header – make sure to install the header on the top side of the board. Solder
the jumpers on the backside of the board as shown.
Switchboard 2
16pin Header – make sure to install the header centered on the top side
of the board Solder the jumpers on the backside of the board as shown

Switchboard 3
16pin Header – make sure to install the header centered on the top side
of the board Solder the jumpers on the backside of the board as shown
Switchboard 4 (Single Switch)
We already soldered the jumper on this board, you can use it as is

Switch board installation
Mount the switch boards and the main board on the bottom plate of the
synthesizer as shown in in the picture using the 15 2,9x4,5mm screws
The switchboards are mounted in reverse order to keep cable length
short From left to right: Switch board 4 (single), switch board 3 (16p),
switch board 2 (16p), switch board 1 (20p), main board
Caution: the case bottom is made out of plastic We recommend drilling
pilot holes (2mm diameter) before installing the screws, but be careful
not to drill through the bottom, about 1mm deep is enough
Plug in the interconnection cables between the boards

Power connection
Unplug the two connectors on the power supply pcb Remove the 4
screws holding the pcb
Flip the pcb away from you so you have access to the bottom side
Solder the wires of the power cable assembly as shown in the picture
Take care not to create solder bridges

Installing the switch contacts
As the switch boards are installed in reverse order switch 1 triggers the
highest note and switch 49 triggers the lowest note
That also means that the key assignment is in reverse order Keep that in
mind should you wish to play with the configuration!
Cut the ribbon cables to length and strip the wires
Switch board 1 (20pin connector):
Wires 1 (red stripe) gets soldered to the common bus bar, see picture
Wires 2 gets cut
Wires 3-18 get soldered to key contacts 49-34
Wires 19 and 20 get cut

Switch board 2
Wires 1-16 get soldered to key contacts 33-18
Switch board 3
Wires 1-16 get soldered to key contacts 17-2
Switch board 4 (single):
The single wire gets soldered key contact 1
Installing the midi socket
The midi socket can be installed on the back of the machine
Use the provided drill guide to center punch the locations of the 3 holes
The two small holes need to be about 3 2mmm to 3 5mm in diameter,
the large hole 15mm Here we typically use a stepping drill
Install the MIDI socket using the 2 M3x8mm screws and the 2 M3 nuts
If you chose to install the MIDI socket next to the Volume Pedal socket
you need to extend the wires of 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
Configuration
You need to flash the corresponding configuration file to OrganDonor
using our configuration tool
The configuration tool can also be used to experiment 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