23 May
2002
23 May
'02
7:46 a.m.
On Thu, 23 May 2002, Jeff Hellige wrote:
The cover is probably removable, thought I'd certainly not try removing
it... The reason they'd use a removable cover is so the whole board could
be put in a stand, under a micro-manipulator, and tiny probes could be
used to probe at different spots on the chip's die.
-Toth
I was starting
to wonder how they might have installed that QFP without a
cover. It would be possible to hand solder such a chip, instead of using
an automated hot air system, but hand soldering that size of QFP would not
be an easy task, and there would be a serious risk of flux contamination
of the die. I really haven't seen too many chips that used a clear cover,
and I'd guess they were still debugging/testing that particular chip.
I really had to turn the system slowly in the light to see that there
was something covering the whole chip. It was very difficult to spot.