ELECRAFT 11
In addition to the tools supplied, you will need these standard tools:
Fine-tip soldering iron, 20-40 watt (temperature-controlled
preferred, with 700 or 800°F tip [370-430°C]
IC-grade, small-diameter (.031") solder (DO NOT use acid-
core solder, water-soluble flux solder, additional flux, or
solvents of any kind, which will void your warranty)
Desoldering tools (wick, solder-sucker, etc.)
Needle-nose pliers
Small-point diagonal cutters, preferably flush-cutting
Small Phillips screwdriver
Jeweler’s flat-blade screwdriver
While not required, the following items are recommended:
DMM (digital multimeter) for doing resistance and voltage
checks. A DMM with capacitance measurement capability is
strongly recommended (see Identifying Capacitors).
Magnifying glass
Conductive wrist strap
Assembly Notes
i
This symbol is used to alert you to important information
about assembly, alignment, or operation of the K2.
Photographs
You should review the photographs in Appendix D to get an idea of
what the completed PC board assemblies look like.
Step-by-Step Assembly
Each step in the assembly process is accompanied by a check-box:
In some steps you will actually be installing multiple components of
a particular type. In this case the instructions will be followed by a
table listing all of the components to be installed, so you won’t
need to refer to the parts list during assembly. The order that the
components are installed corresponds to their PCB locations.
Do not skip any assembly steps; you may find that you’ve
installed one component that hinders the installation of
another.
Forming component leads: In a few cases you’ll find that the
space provided for a component on the PC board is larger than the
distance between the leads on the part itself. In such cases, you’ll
need to carefully bend the leads out and then down to fit the given
space. Always use needle-nose pliers to accomplish this task, and
bend the leads–don’t tug on them. This is especially important
with capacitor leads, which are fragile.
Bottom-Mounted Components
A number of components in the K2 are mounted on the bottom of
the PC boards to improve component spacing or for electrical
reasons. Component outline symbols are provided on both sides of
each board, so it will always be clear which side a particular
component goes on. You’ll be able to tell the top of the board from
the bottom easily: the top side has far more parts. Bottom-
mounted parts are identified on the schematic by this symbol:
Top/bottom interference: In a few cases, top-mounted parts may
interfere with the trimming and soldering of a bottom-mounted
part. In this case, pre-trim the leads of the bottom-mounted part
before final placement, and solder it on the bottom rather than on
the top. (Since all holes are plated-through, you can solder on
either side.)
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