Specifications

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iii) Connect one end in each of the 4 wires to the terminal block behind the top case as shown below.
The wire that goes into the "GND" terminal at the top case must be connected at the other end to the
“GND" terminal at the main board. The same goes for the "+5V", "B" and "A" connection.
iv) Fasten back the top and bottom case into place. Hook the two upper claws into their respective slots
and snap the lower part shut.