QRP Labs QCX-mini CW, Руководство по сборке, Страница: 13 / 121

4. Component lead offcuts
In this kit, you must KEEP all the component lead off-cuts! Yes, I know, it’s fun when you
cut them with the wire-cutter to hear them pinging around the room somewhere, and even
more fun when your XYL finds them embedded in
the carpet somewhere else in the house, and
nothing quite beats the entertainment value of
when she steps on one and it is embedded in the
sole of her foot… ah yes, oh, the baby keeps
waking up all night, EVEN more often than he
would normally anyway. What? Who put that 2cm
piece of wire offcut in his nappy (a.k.a. diaper), that
can’t have been very comfortable. Ooops.
Yes, fun fun! BUT, in this assembly you actually
have to KEEP the component wire offcuts because
you are going to use them later in the assembly,
for connecting the LCD module to the display board, and for connecting some controls to
the controls board.
So please read this and keep those off-cuts safely.
5. PRECISION
I can’t emphasize this enough: this board is compact, and the fit in the optional enclosure is
precise with low tolerance for error. The following is essential:
•
In general, the holes in the PCB are larger than the corresponding component leads/
pins. Try to align each component centrally and squarely, where there is movement
range.
•
All connectors and controls need to be seated flush on the PCB, orientated square to
the PCB, and precisely aligned as described in the corresponding assembly manual
steps.
•
All components need to be installed seated fully on the PCB, such as electrolytic
capacitors and the trimmer resistors, because in many cases even an extra fraction
of a mm height can cause the boards to not fit together properly.
•
Follow all assembly steps carefully and precisely. Pay particular attention to any
description involving component orientation, such as cutting off the feet of the
trimmer potentiometers,
QCX-mini assembly Rev 1.05
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