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Step 4:
1.
Apply flux to the 16 gold colored solder pad holes on the LCD display on the side
where the screen in located. Then, insert the 16 pin Male Header into the solder
holes of the LCD such that the long side of the male header protrudes on the side
opposite the LCD screen. (Figure 16) Solder the male header to the LCD. Take
care that the male header is soldered perpendicular to the LCD, i.e. not cocked to
one side.
Figure 16
2.
At this point in the assembly process, the only components left to solder to the
main PCB should be the five (5) tactile push-button switches. We have learned
that this is a good point in the assembly process to stop and thoroughly clean the
main PCB board and the LCD display of all solder flux and solder residue. In
addition, the tactile push-button switches are not sealed and if the switches are
immersed in alcohol, it is difficult to dry them out.
Therefore, we do not
recommend installing the five (5) push-button switches until the main
PCB board is thoroughly cleaned and dried.
3.
Obtain a shallow plastic container that can be disposed of after use. We have
found that plastic frozen dinner trays work well for this purpose. It is important
to allow as little of the alcohol as possible to enter the USB Type B connector, the
BNC connector and the 3.5mm Antenna Jack.
4.
Pour some Isopropyl alcohol into the disposable container so that the level is
approximately 5mm – 10 mm. While holding the main PCB by the BNC
