Quote:
Originally Posted by Red to black
Quote:
The opto coupler is easily damaged by excessive heat while soldering, so remember to keep your
soldering iron temperature turned down to 250oC or below, and not to solder for more than 10 seconds
on each leg. If these conditions are not met the transparent barrier between the LED and opto
transistor will be damaged. Note that sometimes the set will work for several weeks or months before
failing if the opto has been damaged during fitting
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Shades of old Germanium devices  |
Ten seconds per pin? I'm not surprised Sharp were seeing failures with that advice.
By the way, one sure way of destroying an LED is to solder it while it is illuminated, but don't ask how I know that.