Instruction manual

WCT3  23
FINAL ASSEMBLY
You’re on the final leg of your journey. Now we’ll do some final mechanical
assembly and testing and you’ll be using your WCT3 in no time.
Locate the back of the case assembly. This is the part with a slide off door for
the battery. Slide the battery cover off the case bottom and position the back
so the inside is up and the battery compartment area is nearest you.
76. Place the circuit board into the case back so D6, D7, D8, D10 and Q1
are at the top facing up with the 4 notches on the sides fitting over the 4
posts in the case.
77. You will notice there is small slot between the battery area and circuit
board area in the case at the bottom left corner of the circuit board. Route
the red and black wires thru this slot so there is about 1.25 inches of wire
in the battery compartment area and carefully push them into the slot.
The remainder of the wire can be placed along the left side of the round
post near the slot and folded so it lays neatly in the circuit board area.
78. Find the small black cylindrical push button cap and press it firmly
onto the small button on switch S1.
Take a moment and check over all your work. Make sure that all the LED’s
are standing straight up from the board, Q1 does not extend past the edge of
the board and that the battery wires pass between the board and battery
areas as instructed in step #72. Also make one last check for any solder
bridges and unsoldered components and that all parts are in the proper
location and orientation as necessary.
OPERATIONAL CHECK
The moment of truth is here. Connect a 9 volt battery to the battery clip.
79. Press S1 and observe the LED’s. Power indicator D1 should light
and stay on as long as S1 is pressed. If it doesn’t make sure that D1 and
R7 are installed correctly.
80. The other 4 LED’s may flash momentarily and go out. This is normal
operation. If you find that D8, the IR indicator, stays on try covering Q1 or
turning it away from the bright light you may have on your work bench. It
may be detecting the ‘flicker’ of a florescent light source or any other light
that is modulated at 60/50Hz.
81. At this point it would be a good idea to try testing the 315/433MHz,
125KHz and 20KHz detector operation. To do this you will need a known
good source of these signals like the key fob for your car or an IR remote
control. If you have a signal generator capable of generating these
signals you can use them to test the detector circuits by simply connecting
them to a test lead wire and placing it near the WCT3. Remember that
signal strength and physical placement of the source and WCT3 will affect