Enclosure assembly instructions

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Schematic of power module

Begin by assembling the power module board as shown below.

The DFD1 and DFD2 versions are identical except for the number of input circuits.

The cathode end (striped end) of the diodes point to the 1000uF capacitors.

Note the polarity of the 100uF and 1000uF caps with the negative terminals face to face.

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Attach wires (about 6" long) to the pads of the power module board to connect to the counter board after installation of both boards in the chassis.

Prepare the chassis as shown below. (Click on picture to enlarge the image)

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If for a DFD1-Hamm or DFD1-National drill a 1/4" hole 3/4" in from front 2" from side as shown above.
HOLE IS NOT REQUIRED FOR OTHER MODELS
This provides access to the "MODEL SELECT" function of those counters.
Using an Xacto knife lift on corner of the back of the panel decal and then peel off the backing sheet.
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Carefully position the front panel decal and press in place. Wait until you have completed assembly to remove the protective sheet from the front of the decal.
Carefully cut out the rear panel decal.  This will vary in appearancewith the type counter board you have.

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Remove it's backing sheet similar to the way you did the front panel decal. Carefully position and press it in place centered on the rear of the chassis.
Using the Xacto knife, cut out the holes used for your counter using the holes in the chassis as a guide.
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This could be anywhere from two to four holes depending on the type counter.
Solder the female connector on the LCD module and enlarge the four corner holes to pass a #4 screw (1/8")
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Remove the plastic scratch protective film from the front of the LCD and fasten it  in the chassis using the four #4 x 1/2" screws.
Install the prewired power module in the chassis using
two #4 x 1/4" screws.  Screws are not used in the two rear
corners.
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The anode, A, connection and cathode, K, connection may vary in appearance depending on the manufacturer of the LCD.  They are marked A and K on most types.
Attach the A and K wires from the power module to the
A and K terminals of the LCD.

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DFD1-Drake and DFD1-Swan require a switch to be installed.
 
Mount the switch flush down against the Power module.
This switch goes from the add/subtract jumper input of the counter to ground. 
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The hole will be oversize but it still works fine. Use the middle and bottom (next to PCB) terminals. A ground connection can be made to an unused pad on the power module as shown above.

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It is usually easier to connect the power leads to the counter module with it unplugged from the LCD.  A DFD2 is shown but a DFD1 is very similar. Now plug the counter board onto the LCD.

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Connect the signal input leads from the counter board to the power module.   There are three for a DFD2 but only one for a DFD1. Slide the completed unit into it's cabinet.

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Attach the four rubber feet and secure the chassis in the cabinet with a #4 x 1/4" screw
Almost All Digital Electronics
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Auburn, WA 98092
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