With this resistor soldered to the board the communications with the CPU (with data coming from the RS422 devices such as expression pedal) did not work.
Desoldering this resistor, fixed the communications issue.
The task is to eighter understand why we would need it or remove it.
With this resistor soldered to the board the communications with the CPU (with data coming from the RS422 devices such as expression pedal) did not work.
Desoldering this resistor, fixed the communications issue.
The task is to eighter understand why we would need it or remove it.