> For the complete documentation index, see [llms.txt](https://help.boomerang3.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.boomerang3.com/xbb020-and-xbb021-manufacturing-description/assembly/internal-wiring.md).
# Internal wiring
1\. Loosen the green connectors on the far left of both analog boards, screw COM\_CABLE\_80MM\_BBO\_OW\_IO, put the connector back and connect to the BBO board according to the drawing.
NOTE, it is important that the upper analog card is connected to the left connector and the lower card to the middle connector on the BBO (see picture below).
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