25 Nov
2002
25 Nov
'02
8:33 a.m.
Excellent. If you can use the right tools, do so. But
it is _possible_ to
do SMD rework using a normal (good) soldering iron.
I'll ask. But now I'm convinced the board has some hope of living, I
hesitate to address it myself...
Are there any marking at all. You mentioned an orange
band(s). How many?
One. I shouldn't have said "band", it's really the whole outside of the
component except the contacts at either end. It looks way too wide to be a
color-code band.
Wait a second. The meter is 20kOhm/V right. I have no
idea what range
you're using, but lets say it's a 10V range. So the meter's resistance is
200k.
Yep, 0-15V range.
Now, it's a consequence of Thevenin's (?spel)
theorem that the output
impedance of a potential divider is the given by the 2 resistors in
parallel. Here you'vr got 11500 Ohms and 61900 ohms. The equivalent
resistance of those in paralle is 9.7k. So the meter is 20 times as high
an impedance. That would give approximately a 5% error. Not that bad.
Well, true if I'm right about the resistor values being 11.5k/61.9k. If
they are 10 times higher, then I'm sunk.
I wouldn't. For one thing, desoldering SMD parts
risks damaging the PCB
and even more so the component (most manufacturers recomend against
reusing desoldered SMD parts). After desoldering the value might not he
right anyway. For another, you don't know that all the capacitors on that
board should be the same value.
True even with the proper (hot-air) desoldering tools? But suits my
inclination anyway, except that I *would* like to know what that cap. is
supposed to be.
- Mark