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(6) Install the thirteen relays K201-K213. Begin by soldering two opposing pins on each
relay so you can make sure the relay bodies are flat against the circuit board. Then solder
the remaining pins.
Be certain not to miss any pins when you solder the thirteen relays to the circuit board
(7) Install a 26 pin (2x13 pin) header at P207. Solder diagonally opposite pins first, to
make sure the header is flush against the board, and check to make sure you have no
solder bridges between pins.
Be especially careful to avoid solder bridges between the closely spaced pins on the 26 pin header
(8) Install the 0.100” Molex 5 pin header with locking clip at P208. Orient the header so
that it matches the outline on the silkscreened legend.
(9) Install a 4700 µF/16V electrolytic capacitor at C206. Be sure to observe the polarity
of the capacitor. The “+” pad is marked on the silkscreening, whereas the “-“ side is
marked on the capacitor.
(10) Install connectors J201 (25 pin) and J202, J203 (6 pin) along the rear of the circuit
board. Check that these connectors lie flush against the circuit board before you solder
the pins. The spacing between pins is very close, so inspect your work to make certain
there are no solder bridges. Don’t forget to solder the ground plane pins, using extra heat
if necessary.
(11) Install integrated circuits as listed below. Wear a grounded wrist strap or touch a
grounded surface to avoid damaging the ICs with static electricity.
Be sure to align the
notch on the ICs with the silkscreened notch on the circuit board.
Before you solder the
pins, make sure none of them is bent and that all fit into the holes on the circuit board.
Hint: bend the pins on the ICs inward slightly by pressing the IC pins against a flat
surface. This will make the ICs easier to install.
