LEGO 76139, Manual, Page: 3 / 85

Laying cables in between and underneath bricks
Cables can fit in between and underneath LEGO® bricks, plates, and tiles providing they are laid
correctly between the LEGO® studs. Do NOT forcefully join LEGO® together around cables; instead
ensure they are laying comfortably in between each stud.
CAUTION: Forcing LEGO® to connect over a cable can result in damaging the cable and light.
Connecting cable connectors to Expansion Boards
Take extra care when inserting connectors to ports of Expansion Boards. Connectors can be inserted
only one way. With the expansion board facing up, look for the soldered “=” symbol on the left side
of the port. The connector side with the wires exposed should be facing toward the soldered “=”
symbol as you insert into the port. If a plug won’t fit easily into a port connector, do not force it.