ELECRAFT K 2 Owner's Manual page 22

K2 Manual 1/24/99 V.XC ©1999 Elecraft
Install U2 in the orientation shown by its PC board outline, near
the upper left-hand corner of the PC board, but do not solder it yet.
Make sure the notched or dimpled end is lined up with the notched end
of the PC board outline. Even though the outline is covered when the IC
is installed, you can still verify that the IC is installed correctly by
looking at pin 1. The PC board pad corresponding to pin 1 will be
either oval or round, while the other pads are all rectangular or square.
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You may overheat the IC pins or PC pads if you take an
excessive length of time to solder. After a few tries, you should be able
to solder an IC pin in about 1 or 2 seconds. If it seems to be taking
longer, or if your solder joints are not shiny and smooth, review the
recommendations on soldering irons and solder in the previous section.
Bend two of U2's corner pins out slightly on the bottom of the
board to hold the IC firmly in place, flat against the top of the board.
Find pin 1 and verify that its pad is either round or oval. Once U2 is
properly seated, solder all eight pins.
Install the remaining ICs in the order listed. Bend the pins to hold
each IC in place as you did with U2, but do not solder until the next
step. The notched or dimpled end of each IC must be aligned with the
notched end of its PC board outline.
__ U1, NE602 __ U3, LM6482
__ U8, MAX534 __ U9, LM380
Verify the location of pin 1 on each IC by looking at the associated
PC board pads, as before. Then solder all of the ICs.
rows of pins must be straight and parallel to each other to establish the
proper pin spacing for insertion into the socket. To straighten the pins,
hold the microcontroller's body at each end, then rest one entire row of
pins against a hard, flat surface. Gently press down on the pins and
rock the IC forward to bend the pins into position.
be careful to avoid bending its pins. Make sure that all pins are lined up
with the associated holes in the socket before pressing down on the IC.
Watch the pins on both rows as you press down, realigning them with
the socket holes individually if necessary.
__ U7, 25LC160
__ U10, LMC660 on the IC itself is lined up with the pin 1 label near the lower left-hand
corner of the PCB outline.
Prepare the pins of the microcontroller, U6 (Figure 4-10). The two
Flared
Straight
Figure 4-10
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When the microcontroller is installed in the next step, you must
Insert the microcontroller, U6, into its socket. Make sure that pin 1
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