Elecraft KPA100UPKT User Manual
Page 5
5
Replace R38 and R39
wi
t
h
22
ohm
(
22
Ω)
3
wa
t
t
r
e
s
i
s
t
or
s
.The replacement resistors are slightly longer than the solder
hole pad spacing for them. Bend the leads to space them above the PCB as shown in Figure 3. Position the resistors so they
do not touch each other.
Form Leads to
Space Resistors
Above the Board.
Leave a Small Gap
Between Resistors.
Figure 3. Installing R38 and R39.
Part III: T/R Switch and Output Circuit Changes
Locate C83, the 1000-pF silver mica capacitor that you removed earlier. Bend the leads to the sides where they exit the
body of the capacitor. If necessary, trim them to approximately 1/8" (3 mm) long.
Place C83 in exactly the position shown in Figure 4, extending horizontally away from T2 over R38 and R39. The leads
normally exit the body of the capacitor near the side opposite the markings, so it will be easier to solder if this side is up as
shown. There are no solder pads. The leads lay flat against the tinned end plates on T2. Tin one of the end plates where the
capacitor lead will attach, leaving a small bump of solder on the plate. Then hold the capacitor in place and touch the lead and
plate with your iron to flow the solder onto the lead to hold the capacitor. Solder the other lead, then go back and touch up the
first lead if needed.
Position C83
as shown.
See text.
Figure 4. Installing C83.
Check the position of C83 to ensure that no part of the body is higher than the circuit board end plate of T2. If it is
higher than the edge of the end plate, the shield may strike the capacitor when it is installed.
i
Refer to Figure 5 for the locations of the parts in the following steps.
Replace C86 with a .0047 µF (472), 100V. Use a
s
mal
l
e
r
0.
2”
l
e
ad
s
pac
i
ng
c
apac
i
t
or
r
at
e
d
at
100
V,not one of the
larger c
apac
i
t
or
s
wi
t
h
0.
4”
l
e
ad
s
pac
i
ng.
Replace C67 with a .0047 µF (472), 100V. Use
a
s
mal
l
e
r
0.
2”
l
e
ad
s
pac
i
ng
c
apac
i
t
or
r
at
e
d
at
100
V,
not
one
of
t
he
l
ar
ge
r
c
apac
i
t
or
s
wi
t
h
0.
4”
l
e
ad
s
pac
i
ng.