Power Supply Assembly Instructions
After inserting the components, it's ok
to bend the legs a little to keep them in place until you are ready to
solder. Trim the legs before soldering, BUT be sure to mount the regulators
to their heat sinks before inserting into the PCB as per the instructions
Soldering Iron temperature can be 700-degrees-F
(371-degrees-C) for most parts, HOWEVER, the heat sinks will require more
heat (750~800-F / 398~426-C). Keep in mind that it's important to
heat the work so that the solder flows to it, especially for more "maasive"
parts. Then return the iron to its "normal" temperature to keep the
tip from oxidizing. Tip Tinner
/ Cleaner works well to restore a tip that becomes oxidized (dull and gritty).
Add the low profile parts such as resistors
and diodes first. Note the markings for the diodes. The line indicates
the cathode of the diode. Make sure to line up the band of the diode with
the line on the silkscreen designator of the board.
Note that the electrolytic capacitors are
polarized. The silkscreen on the board indicates the positive side of the
cap with a plus. Additionally, the board’s holes provide a square outlined
hole for the positive side as well. The markings on the caps are for the
negative leads. Make sure the blank side of the cap lines up with the plus
or square hole on the board.
Here's the "Punch List."
The positive side of the rectifier D-1 aligns
with the square silk-screen on the PCB.
Solder in C-1 and C-2. Trim the excess leads
off the bottom with diagonal cutters.
Apply a small amount of heat-sink compound
to the backs of regulators U-1 and U-2 and bolt them to the top holes of
the heat sinks with a 4-40 bolt, lock washer, and nut.
Make sure the legs of the regulators are perpendicular
to the board (point straight down). You need not apply a lot of torque
to the bolts. Simply snug them up. You should still be able to swing the
regulator a little from side to side so the legs are straight down. Grab
by the body of the regulator, not the legs, to make movements.
Solder the regulators and heat-sink legs to
the board. You may need to increase the tip temperature to get solder to
flow to the heat-sink legs.
Insert and solder headers J-2, J-3, J-4, J-5