Sixty Four Pixels PCLONE2, Инструкция по эксплуатации

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Now insert the trimmer potentiometer, R45. This is pretty tight to insert into
the PCB and may need a bit of waggling
– be careful not to damage the
legs.
Solder the LED. It is important that this goes the right way a
round; you’ll
see that the marking on the board shows a “flat” side next to one of the legs
(beside the “PWR” label). The LED has a matching “flat” (marking the
negative terminal, which also has a shorter leg). Line the flats up when
inserting the LED and don’t heat for too long when soldering.