Elecraft K2 Owner's Manual - Manual (Page 28)

E
LECRAFT ® 27
Install rectangular gray key caps on S1 and S3 so the key caps are
parallel to the long axis of the PC board (Figure 5-8). The caps are
installed simply by pressing them onto the switch plungers.
Square Keycap
Gray keycaps
Figure 5-8
Install a square black key cap on S7 as shown above.
Install rectangular black key caps on the remaining switches.
i
Before handling U1, touch an unpainted, grounded metal
surface or put on a conductive wrist-strap.
Straighten the pins of U1, the LCD driver (PCF8566), as you did
with the microcontroller on the Control board.
Insert U1 into its socket on the bottom of the board. (This must be
done before continuing with LCD installation, since the LCD’s
presence will make pressing U1 into its socket much more difficult.)
Be sure that U1 is completely seated with no bent pins.
Locate the LCD backlight assembly, which is about 3" (7.5 cm)
long. It includes the diffuser and two small LEDs, one at each end. Do
not remove the backing from either side of the diffuser.
Make sure the LEDs in the LCD backlight assembly are pressed
into the diffuser and are not mis-aligned or loose.
Position the backlight assembly between the mounting holes
labeled D2 and D3 as shown in Figures 5-9 and 5-10 with two 3/4" (19
mm) long spacers under each end. The diffuser must be parallel to and
1/8" (3 mm) above the PC board. Use a rubber band to hold the
backlight assembly and spacers in place.
diffuser
spacers
2 under each end
(remove after
soldering LED leads)
pc board
LED leads
Figure 5-9
LED
D2 D3
diffuser
Figure 5-10
Examine the backlight assembly closely to ensure that it is
parallel to the Front Panel board and seated against the spacers
(exactly 1/8" [3 mm] above the board).
Solder D2 and D3. If the backlight assembly is no longer flat
against the PC board, re-heat the LED pins one at a time and press it
into place.