> For the complete documentation index, see [llms.txt](https://nxp.gitbook.io/nxp-cup/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nxp.gitbook.io/nxp-cup/2019-dfrobot-chassis-developer-guide/landzo-car-model/assembly/model-alamak-with-frdm-kl25z/assembly-circuit-boards.md).

# Circuit Boards

First, you should check your Circuit Board. At the end, the boards should be stacked together as shown in the last picture. There is a double row pin socket on the bottom of the System Board. This socket should be connected with the pins of the Motor Driver Board.

![Installed System Board and Motor Driver Board (above) and FRDM KL25 Board (below)](/files/-L9GM4k3h4I5puPVluYa)

The FRDM KL25 will need pin sockets installed on the bottom side in order to mate with the System Board. You can find a detailed instruction on the next page.

![FRDM KL25 with uninstalled pin sockets](/files/-L9GLz6jX-quNQHoEElY)

After installing the pin socket on the FRDM KL25, the board can put the  FRDM KL25 and the System Board together.

![Assembly of the Circuit Boards](/files/-L9GM4k9iueDYylJz_YS)

For now it makes sense to dismantle the boards once again. This makes it easier to mount the Power Board on the Chassis.