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3. Install U1, the MC68HRC908JK1 programmed chip [20 pin chip with
paper label] into the IC socket. Check the orientation before installing.
The chip is marked with a dot or notch on one end which must be lined
up with the notched end shown on the PC board silkscreen and parts
layout diagram.
4. Install S2, the DPDT pushbutton switch. Be sure it is flat to the PC
board before soldering.
5. Install S3, the other DPDT pushbutton switch.
6. Install R3, 5.6K ohms (green-blue-red).
7. Install R1, 1K ohm (brown-black-red).
8. Install R4, 10K ohm (brown-black-orange).
9. In the same way, install R5, R6, and R7, all 10K ohm (brown-black-
orange).
10. Install S1, the 8 pin DIP switch. Orient the switches toward the
outside of the PC board, away from R7.
11. Install R2, the 10K ohm PC mount potentiometer. Seat the part flat
on the PC board and solder all five connections.
12. Install J6, the +12 VDC input power jack.
13. Install C1, a 100 pF ceramic disc capacitor (marked 100, 101, or
100K).
14. You will now need to install the first of your jumper wires. Before
installing in the PC board you will need to form a clipped off lead (saved
from previous steps) into what looks like a staple whose width
corresponds to the hole spacing on the board marked JMP5. Once
formed, install the wire just as if it were a resistor, bend the leads out on
the solder side of the board to keep it from falling out, and solder. It will
be a help to get the spacing right on this one as sort of a pattern for you
because you'll be installing several more jumpers along the way.
15. Install C2 and C3, the .01µF ceramic disc capacitors (marked .01,
103, or 10nF]).
16. Install VR1, the 7805 5 volt regulator. This part ensures a clean DC
voltage for your kit. You will want to bend the center lead out slightly for
a good fit into the PC board. Solder all three leads.
17. Install D1, the 1N4004 diode. Diodes have a polarity and must be
installed correctly to work properly. You will notice that one end of the
diode is marked with a band. Be sure to orient this banded end as
shown on the parts layout diagram and PC board silkscreen.
AVS10 – 10
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