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4.4. Test low voltage (LV) source operability. Touch the black probe on the GND test point and the red
probe on the 5V test point. The voltage should measure between 4.8 and 5.2 Volts. If not, disconnect
power and check all relevant joints quality and polarity.
Do not continue with the assembly until the error will be corrected.
NOTES:
Do not place the microcontroller U4 into the socket before you mount the socket onto
the board.
Mount the socket such that the notch in the socket lines up with the notch marking in
rectangular outline printed on the board.
After inserting a socket into the board, solder its two opposite-corners pins first. This will
hold the socket in place. Look at it carefully to check it proper orientation. If not, it is easy
to heat one or both pins and adjust the socket. Only if everythis correct, solder the rest
pins. Remember: to keep the soldering time per pin brief. The pins do not need to clip.
The microcontroller notch indicates how IC should be mounted into the socket after the
socket has been soldered into the PCB.
4.5. Once the last test of LV source is completed, disconnect the power.
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