Elecraft KPA100UPKT User Manual
Page 7
7
Figure 6. Winding L16 and RFC1.
Strip the insulation and tin the leads of both inductors using one of the following techniques:
1.
Heat Stripping:
a.
Pl
a
c
e
a
s
mal
l
amount
of
s
ol
der
(
a
.
k.
a
.
a
“
bl
ob”
of
s
ol
de
r
)
on
your
s
ol
de
r
i
ng
i
r
on.
b.
Insert the clipped end of the wire into the hot solder. If the iron is hot enough, you should see the insulation
bubble and vaporize after 4 to 6 seconds.
c.
Add more solder and feed more wire into the solder as the enamel melts. Continue tinning the wire up to the
edge of the core, and then slowly pull the wire out of the solder.
d.
If any enamel remains on the lead, scrape it away using your thumbnail or sharp tool.
2.
Burning: The insulation can be burned off by heating it with a butane lighter for a few seconds. Use sandpaper to
remove the residue, then tin the bare wires.
3.
Scraping: Use a sharp tool to scrape the insulation away. Work carefully and gently: do not nick the wire. Work
around the entire circumference of the wire to remove all of the enamel and tin the bare wires.
Install the new L16 on the PCB. Be sure you place it in the outline for L16 and not L15. The space for L15 must be
left empty. Solder and trim the leads flush with the PCB.
Install the new C64, a .0047 µF (472) 250V or greater voltage capacitor, LS 0.
4”
,
next to L16. The capacitor supplied
may be a different style than that shown in Figure 5. Solder and trim the leads flush with the PCB.
Remove resistor R12. Nothing replaces it.
Install the new RFC1 on the PCB. Stand the toroid up with the original outline for RFC1 just like the other toroids, even
though the solder pads are spaced much farther apart than is needed.
Remove RFC10, located near the ANT connector (see Figure 7). Clip the leads when removing the choke to avoid
possible damage to toroidal transformer T4 and surrounding components.
RFC10
To Be Removed.
Figure 7. Location of RFC10.