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Please tell me the part number of light pipe for MK3/4

The problem has been solved. The reason is in the terminal block. If the screw is unscrewed (not tightened) then there is no contact. And I broke my head, why there is no contact :). I was afraid...

It was a test run and the power was USB. Today I connected 9V, but still at all outputs 0V, including at the 5V terminal.
Please tell me which chip is responsible for the outputs I will check this...

Hello!
Can you tell me, the outputs on the mk3/4 latest version, go through the buffer or directly from the processor?
I have connected the frequency converter through the optocoupler (out1,2) and...