21
(4) Install relay K301 on the front side of the board. Make certain the relay body lies flat
against the board.
Hint: solder diagonally opposite pins first, so you can readjust the
relay body if necessary.
(5) Install the 18 pin DIP IC socket at U301 on the rear side of the circuit board. Make
sure the notch on the socket is aligned with the notch on the silkscreening. Do not plug in
the IC yet.
(6) Install two 26-pin headers at P301, P307 and the 4-pin 0.156” PCB connector
w/locking clip at P302 on the
rear
side of the circuit board.
Hint: solder the end pins first
to secure the headers. Then, after you’re certain the headers are seated against the
board, with the pins perpendicular to the board, solder the remaining pins.
(7) Mount the LCD to the front panel, as follows: (Note: the rectangular cutout on the
front panel is sized for the recommended Microtips NC-S16205DFYSAY display. If
other brands of LCDs are used, it may be necessary to file slightly the cutout opening.)
(a) Slide a 16-pin 0.100” header into position J305 on the
front
side
of the circuit board, but do not solder it yet. (Clip the 16 pins off of a
40 pin breakaway header using wire cutters.)
(b) As shown below,
loosely
mount the LCD onto the top side of the
circuit board using a 1/4” x 2-56 threaded standoff and two 2-56 x
3/16” screws at each of the four mounting holes. The top of the J305
header pins should fit into the mating holes on the LCD. Do not
solder the pins yet. (You want the screws to be loose enough so you
can center the LCD in its front panel cutout in a subsequent step.
The LCD display mounts on four 1/4” threaded standoffs with 2-56 x 3/16” screws and connects to the
circuit board with the 16 pin header. Be sure to solder both ends of each header pin.
