I have an Fatar 88key keyboard type SF, my question is how to connect this keyboard to the controller?
I think the keyboard is different from the modern type keybords where I see a 12 row and 16 lines matrix.
My keyboard have a 22 row and 8 line matrix with alternating contacts, the connection to the controller is with a 40pole flatcable.
The question is must I change the wiring in the keyboard that means adding a lot of Spaghetti, or is it possible to solve this in software settings?
I assume it’s an TP/100? Or what kind of keybed is it?
If you can draw a map of the matrix implementation, you most certainly can change it in software.
I assume not in this case.
I also have a TP/100 which has a totally different wiring than the midibox expects. I had to open it, I cutted some traces and added some thin wires to make it work.
My keyboard is an older model like discribed here:
http://johnp.net/projects/lmk3+/
The Layoput of the matrix looks the same as current range but the difference is 8 lines to the diodes and 2x 11 lines from contacts, in the schematic of the Orla you see that they have changed the input and output function. The newer Fatar keyboards use 16 lines to the diodes and 12 lines to contacts, as dicribed on the Midibox website.
Of course I can change the wiring by cutting the traces and add some wires, where must I made the spit? after 44 keys? there are two PCB’s handling 44 keys each
Do you have a schematic of the diodes-matrix available?
I don’t have a schematic, but it is like this
http://www.ucapps.de/midibox_kb/midibox_kb_scanmatrix_type3.pdf
with the bluelines of the left and right side connected together and reduced to eight lines
how is the scan order with a 88 keyboard
1,2,3,4,5,6,7,8,45,46,47,48,49.50,51,52,9,10,11,12,13 …?
If the scanorder is like above it is easy to make a splt just by removing the flatcable between the two PCB’s plugs and paralleling the rows from the left and richt side.
Yes, it’s this order - your idea should work!
See also http://www.ucapps.de/midibox_kb/midibox_kb_fatar_df_88_interconnections.pdf
MK/BK lines are strobed individually, so that the 8 blue input lines at J3 and J4 could also be connected together.
Best Regards, Thorsten.
Yes! This than should be the same modification I had to do on my TP/100. But there was no flatcable that connects both sides… so I had to cut the traces 
Good luck with your work!
OK thanks, I am going to start designing a PCB and make the mods on the keyboard.
I want to make one PCB for the core and the IO
Yes! This than should be the same modification I had to do on my TP/100. But there was no flatcable that connects both sides… so I had to cut the traces
Good luck with your work!
Did you make the cuttings exactly in the middle? after 44 keys or after 40 or 48 keys
44 is in the middle of a group of 8keys and that is also in my situation.
There are two PCB’s with 44 key contact arrangements.
It has no sense to compare both keybeds. Mine seems to be completely different than yours.
I just realized that I got you wrong on your intro posting. I thought you wrote, that your keybed has also foilcables… but it’s standard flatcable. The TP/100 has 20pin thin foil-cables, which makes the connection to other devices or boards like midibox complicated.
Anyways: If you are in the need of a new keybed, just send me a PM. I’m in contact with a German distributor of Fatar.
It is indeed a normal flatcable, a will make a PCB for the controller and I/O in one and connect direct to the 40 pole connector.
On the 40 pole connector there are 8 pins free so I can wire the extra pins for I0-I7, the paralleling of the rows I want to do on the controller board.
Only question is where to split the I0-I7 lines for the left and right side, now it is between key 44 and 45.
That is a little bit strange in my opinion because it is in the middle of row MK5/BK5
Here a pic of the PCB’s connections, it is not my keyboard but the PCB’s are the same and also the contacts.
I want to keep the small 20 pole flatcable and cut the traces of I0-I7 and place the 8 wires between the the 20 pole jumper to the free contacts of the 40 pole jumper.
Here the schematic of my keyboard, how the contacts are routed to the 40pole connector is given in the schematic of the Orla keyboard.
I think we need to take a look at the other side of the pcb. So you have either to remove the PCB or the keys
See my previous post, I just added a schematic, the orla schematic below let see the connections on the 40 pole connector
keep in mind that the rows of the groups of 4 keys on the right and leftside are connected together and the blue lines of the left and rightside are paralleled.
I edited the schematic so you see how the routing is to the 40 pole connector
my idea is to separate the blue lines between the left and right side and connect the right side to the second input register and left side to the first.
Yes! This is correct and should work.
OK,
I started yesterday with routing of the PCB, with 45x160mm it will find a place in the keybed frame.
I don’t use all the IO of the controller, I use only the Midi in out, USB, the connections to the matrix and the analog inputs so I can keep the PCB small.
PCB ready, there is a groundplane for readabilty I have switched of the toplayer. There are not much traces in the toplayer so the groundplane is very close.
[Midi fatar.bmp](< base_url >/applications/core/interface/file/attachment.php?id=11699)
dimensions are 155x45mm, it fits on the fatar frame near the 40 pole connector.
