Hello, I build the kit mk 171 but it doesn’t work properly. When I put the power on, the two red leds burn and there is some undeterminable sound. I can’t record anything. There is no description how to work with the kit. Who can help me ?

All necessary instructions can be found on the blister card and on the the PCB.
Most likely there are one or more assembly problems.
Sorry, this forum does not allow picture uploads
If you can provide LINKS (e.g. by using a free online picture base) to HI-RES and SHARP pics of your assembly (both solder- and component side)
then we can take a look and provide some feedback.