I changed and relace 3 ethernet cables and checked them with the resistance of the multimeter. This a continuity test. Result is OK: 0 resistance. But...

@nhan-truong Like I said, there is no problem without encoders.

I measured 3.30v on the teensy board,, but there is 4.41v on the brown cable, which goes to the motors, in the enclosure box. May it be cause this? Sh...

I agree with Chris. It's about wiring power cables. Check that A+A-B+B- wires which go to J2 motor.

@duanemclemore The issue doesn't look mechanical. This seems like A+ A- B+ B- (OR +/- ) wiring. Be ensure that you wired J5 connections correctly.

You probably wired connections incorrect. You might have connected the cables cross. Check that J5 cables go to correct driver.

Thanks Johann. I checked USB cable. It works and gives 5v correctly. When I plug power supply, which I use also for motors, to 2 channel relay m...

@johann-voigtlander Thanks Johann. I checked USB cable. It works and gives 5v correctly. When I plug power supply, which I use also for motors,...

I realized that the problem based on USB plug of arduino. When I feed arduino(I tried on arduino UNO and MEGA ) via an extarnal 5v adapter and UNPLUG ...