Elecraft KPA500 Kit Assembly Manual - Manual (Page 6)

5
Preparing for Assembly
Tools Required
1. #0, #1 and #2 size Phillips screwdrivers. To avoid damaging screws and nuts, a power screwdriver is
not
recommended. Use the screwdriver that best fits the screw in each step.
2. Needle-nose pliers.
3. Two 1/2” or adjustable wrenches (for transformer mounting).
4. Soft cloth or clean, soft static dissipating pad to lay cabinet panels on to avoid scratching.
5. DMM for making resistance and continuity measurements.
The following tools are strongly recommended:
1. ESD wrist strap.
2. Static dissipating work pad.
3. Tweezers are very handy for positioning parts in cramped spaces.
4. Rule for measuring screw lengths.
Unpacking and Inventory
CAUTION
Do not handle the circuit boards without anti-static protection! Doing so may damage
sensitive components. See Anti Static Protection Required on page 4 for important information
before proceeding.
Before starting construction, do a complete inventory, comparing the parts in your kit with the parts list in
Appendix A to familiarize yourself with all of the parts and to ensure the kit is complete. Look in the sealed
envelopes to identify their contents, but do not mix them up. Some screws are very similar in length, but must be
used in the correct locations as described in the procedure.
All dimensions given in the assembly procedure are provided in both US customary (often called English) and
metric measurements. The native dimensions of the parts are in US Customary units. Approximate metric
equivalents are given to assist those more familiar with that system to identify the correct parts.
Screws
A number of different types and sizes of screws and washers are used in the assembly. It is very important that
you use the screw specified in each location or your finished KPA500 may not fit together properly. In some
places, using the wrong size screw may damage components. Smaller screws are identified by one or two digits
denoting their diameter followed by a two-digit number indicating the threads per inch. For example, a 2-56
screw is smaller in diameter than a 4-40, and so on. In this case, the 56 indicates 56 threads per inch and 40
indicates 40 threads per inch. Mating nuts are identified in the same way: A 4-40 nut mates with a 4-40 screw.
Washers are identified by only the first digit since only the diameter is significant. For example, a #4 washer fits
a 4-40 screw.
The length of the screws called for in the text is measured as shown in Figure 1. Since the native measurements
are in inches, the metric values shown throughout the text are approximate but accurate enough to allow you to
identify the correct length.