Tips Wizard
Igor Majorov, 1996
HI, ALL!
Here again we met. Today let's talk about how to deal with
pechatnoy board and its components.
The printed circuit board consists of a sheet
foil getinaksa or PCB,
on which are etched conductive paths.
The board has openings (holes), where
will then be soldered circuit elements, well, then
there are all sorts of details.
Typically, these vent obluzheny already, so
that no problems arise. But if
got "left" card, then before the assembly
printed conductors and contact pads
need to prepare for soldering - clear
from the oxide film and contamination.
If the date of manufacture boards gone
a lot of time and a metal coating darkened (oxidized), it must
first clean up its fine to shine sandpaper, and then - rinse
thoroughly with alcohol. After degreasing, all pads board brush
applied to a thin layer of rosin flux. (Composition,%: Rosin -
15-18, the rest is alcohol; Rosin - 6, Glycerin - 14, ethyl
alcohol - everything else).
Radioelements and chips also need to prepare for assembly and
soldering. For of their findings (leg) form (attached
them the desired shape), cut to
length, if necessary, sanded and ludyat
(See ZxNews N8).
Forming can be done with tweezers, mini pliers or other
similar instruments / devices.
Since the adhesion foil
Pay is low and decreases when heated, then try to keep the
soldering iron does not warming cost more than 5 seconds.
Soldering boards should apply solder
low melting point: POSCO 50,
PIC 61 and other power soldering iron - no more
35-40 Tues Soldering iron should have needle-like sting and
ostrozatochennoe obluzhennoe.
Soldering of circuit elements is performed as well as
soldering 2 obluzhennyh wires, ie insert details in the right
leg openings and heat them alternately.
That's it! Until we meet again.
If you have any questions please call
Tel: 275-5712 (after 18:00), to ask Igor.
P.S. When writing this article partly on materials from the
book: "Practical Webmaster tips lover ".
__________________________
