Elecraft K1 User Manual
Page 22
E
LECRAFT
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Inspect the solder side of U1's socket on the top side of the board.
Make sure all pins are soldered, with no cold solder joints.
Using a DMM, check every pair of adjacent pads on U1 on the
top side of the board (pins 1-20 and 21-40). The resistance between
pads should be over 1000 ohms (1 k) in all cases, and may read infinite
on your DMM (often indicated by a flashing display).
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Before handling U1 in the next step, touch an unpainted,
grounded metal surface.
Straighten the pins of the microcontroller, U1. You can hold the
IC body at the ends as you re-form each row of pins.
Insert U1 into its socket, with the notched end oriented towards
the pin 1 end of the component outline.
Look at both rows of pins on U1 closely. If any pins are bent,
carefully remove the IC by prying at both ends using a small flat-blade
screwdriver. Straighten the pins using long-nose pliers.
NOTE:
If you purchased the K1 LCD Backlight Kit and are going to
install it into your K1 now, refer to the instructions for adding the
backlight, then go directly to Visual Inspection on the next page.
Locate the black neoprene LCD spacer (MISC. bag), which is 1/2
x 1/2 square and 3/16" thick (12 x 12 x 5 mm). Remove the adhesive
backing from one side and position the spacer as shown in Figure 5-7.
It must be mounted flat against the PC board, centered between the
two rows of pins on U1's socket.
Spacer
Figure 5-7
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Caution: the LCD (DS1) and its pins are fragile.
Remove the LCD from its packing materials, being careful not to
bend the pins. As shown in Figure 5-8, the pin 1 end of the LCD glass
has a very slight bump, along with a break in the black border. This
end will be oriented towards the pin 1 end of DS1's component
outline.
Bump
DS1
1
12
13
24
Figure 5-8
Remove the adhesive backing from top side of the LCD spacer.
Install the LCD at DS1, oriented as shown above. Make sure that
all 24 pins are inserted into their holes, then press down gently on the
LCD to secure it to the LCD spacer's adhesive surface. The LCD pins
may not extend all the way through the holes. The surface of the LCD
must be parallel to the PC board.
Once the LCD is positioned correctly, solder all pins.