6
Make sure that the 2-pin male connector is flat against the PC board, then solder.
Install the 5-pin and 3-pin male connectors on the bottom side of the board at P1 and P2. The short
ends of the pins are inserted into the PC board from the bottom (see drawing, page 5). Do not solder yet.
Solder just one pin each of P1 and P2. If the connectors do not appear to be seated flat against the PC
board, or they are tilted, re-heat the pins and adjust the connectors as needed. Once the connectors are
correctly installed, solder all remaining pins.
Install the two shielded inductors (L1 and L2) as indicated by their component outlines. Make sure the
inductors are pressed down onto the PC board as far as they can go, then bend the leads slightly to hold
them into position while soldering. Trim the leads as close to the board as possible.
Install the battery socket, straightening the leads if necessary.
The battery itself will be installed
later. If it is installed in the socket at this time, remove it.
Install cylindrical crystal X1 vertically between U3 and BT1. The exposed lead length should be 0.1"
(2.5 mm) or less. Be careful with the crystal's leads, which are very thin and may break if stressed.
The KAF2 date display format is normally MM-DD-YY. If you prefer DD-MM-YY, solder a short
wire jumper at W2. The pads for W2 are located on the bottom of the board, near pin 10 of U2.
Capacitor C19 (33 pF) must be soldered onto two pads of U3, on the bottom side of the PC board (see
below). Pin 1 is identified in the illustration (round pad). C19 should be soldered to pins 2 and 4. Make sure
that the body of C19 is not touching any adjacent pads.
R14
C19
U3-1
i
Before handling U2, touch an unpainted, grounded metal surface.
Carefully straighten the pins on the microcontroller, U2 (PIC16C621A). The two rows of pins must be
parallel to each other, with no pins bent.
Press the microcontroller into its socket, orienting the notched or dimpled end of the IC with the
notched end of its component outline. The labeling on the microcontroller should read from left to right,
like the other ICs on the board.
