Elecraft K60XV Manual User Manual
Page 11
11
Heatsink/Lower Rear Panel Preparation
If you wish to modify your existing heatsink panel for use with phono connectors, do so now, using the
drilling template below. Position the holes exactly as shown to ensure that the connectors do not
interfere with the K60XV module or parts on the RF board. Use a small pilot bit before drilling the
final holes. You'll may need to move the K2's serial number label to the right. If it becomes damaged when
you remove it, you can obtain a replacement from Elecraft.
0.28
dia
3.02
0.52
0.55
KEY
RX
ANT
XVTR
IN
OUT
(1.40 cm)
(7.1 mm)
(1.32 cm)
(7.67 cm)
If you plan to substitute a new heat sink, move the 160-m module and RX ANT jack (if applicable),
two rubber feet, and serial number label from the old panel to the new one. If the serial number label
becomes damaged when you remove it, you can obtain a replacement from Elecraft.
Replacement thermal pads are supplied for the PA transistors (Q7 and Q8). Use these replacements if
the original pads appear to be damaged in any way. (See Figure 6-32 in the K2 Owner's manual.)
Turn the K2 up on its left side, with the front panel facing forward.
Re-install the heatsink panel as follows, also referring to Figures 6-33 and 6-34 of the K2 Owner's
manual if necessary: (1) carefully remove the two nuts holding the PA transistor hardware together (don't
let the hardware fall out); (2) push the PA screws back into the cabinet (from the bottom side) just enough
to allow installation of the heatsink; (3) install the heatsink (fig. 6-33); (4) install the two nuts and lock
washers that retain the PA transistors (do not overtighten); (5) install six screws, starting with the two
between the PA transistors (fig. 6-34); (6) install the hardware retaining the antenna and key jacks; (7) if
you have a K160RX module, plug it into J14 on the K2 RF board. The K2 can now be returned to a
horizontal orientation.
Using an ohmmeter on its lowest scale, measure the resistance to ground from the collectors of Q7 and
Q8. If there's a short (< 10 ohms), remove the heat sink and investigate the cause. The most likely reason
for a short is mis-alignment of a shoulder washer or thermal pad.