Farfisa Combo Compact MIDI retrofit Installation manual
MIDI kit for Farfisa Compact (CC23 versions without percussion) Like on this photo
Installation:
Board installed under switchboard. For this, sometimes you may need to cut the springs a little bit to make free space between the MIDI board and switches in the installation area. Skip this step if distance between board and springs is good, or add some insulation like blue paper tape to PCB. 
2. Drill holes with 3.2-4mm drill bit on the next places: 
Then drill holes for the LED, button and DIN5 connector For example good place at the right side of the keyboard. First step is - drill plastic part, second - drill wood part with bigger wood drill bit and make a canal for wires. 
Drill dimensions:
MIDI jack (DIN5) = 18mm.
LED holder = 6mm.
Push button = 12.5-13mm.
Be careful with drilling hole for button, it have so small range to get hole too big.
Wiring: Set includes ribbon cable with next dimensions for note and other connections.
C (Do) = 90cm. (6 wire ribbon cable)
C# (Do diesis) =115cm. (6 wire ribbon cable)
D (Re) = 95cm. (6 wire ribbon cable)
D# (Re diesis) = 110cm. (6 wire ribbon cable)
E (Mi) = 130cm. (6 wire ribbon cable)
F (Fa) = 115cm. (6 wire ribbon cable)
F# (Fa diesis) = 135cm. (6 wire ribbon cable)
G (Sol’) = 105cm. (6 wire ribbon cable)
G# (Sol’ diesis) = 120cm. (6 wire ribbon cable)
A (La) = 140cm. (6 wire ribbon cable)
A# (La diesis) = 130cm. (6 wire ribbon cable)
B ( Si) = 150cm. (6 wire ribbon cable)
MIDI connector, Led, Button = 180cm. (6 wire ribbon cable)
Power + Bass octave out = 85cm. (3 wire ribbon cable)
Out to switch board 2x30cm. (6 wire ribbon cable)
Farfisa Generators boards;
Same shown on MIDI PCB Where @ means note and number of connection points on farfisa (from left to right how is shown on picture).
Farfisa Combo Compact only: For bass octave sound out need to solder here on PD PS10 
Numbers on MIDI PCB say about the same numbers at the Farfisa side. 1-12 on switch board, PD_PS10 for PD contact on the PS10 board.
Here is the points and wires number to connect MIDI board out signals to Farfisa switch board: Shielded wires marked as 1-12. They coming from key contact rails.
Solder MIDI connector (number for pins marked on the PCB), Led, Button and wires to power supply. 
Here is point to connect: actual voltage under load here is 15V.
Process for set MIDI channel: User operationsStop all MIDI traffic.
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. He will in OMNY mode.
Send any note on the MIDI channel which you want for this synth.
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.
Now the channel saved to memory and will never change before you push LEARN button again and starts settings process again.
At moment when synth power on, all keys will be sound less a half second. If on this moment MIDI commands will received on saved channel it can be cause of panic.
Last update: 10 January 2026.
