Heathkit IO-4205 - Page 8

Page 6
6. Each circuit part in an electronic kit has its own
component number (R2, C4, etc. ). Use these
numbers when you want to identify the same
part in the various sections of the Manual.
These numbers , which are especially useful if a
part has to be replaced , appear:
In the Parts List,
At the beginning of each step where a
component is installed,
In some illustrations,
In the Schematic,
In
the section at the rear of the Manual.
7. When you are instructed to cut something to a
particular length, use the scales (rulers) pro-
vided at the bottom of the Manual pages.
SAFETY WARNING:
Avoid eye injury when you cut
off excess lead lengths. Hold the leads so they cannot
fly toward your eyes.
SOLDERING
Soldering is one of the most important operations you
will perform while assembling your kit. A good sol-
der connection will form an electrical connection be-
tween two parts , such as a component lead and a
circuit board foil. A bad solder connection could pre-
vent an otherwise well-assembled kit from operating
properly.
It is easy to make a
good solder connection if you
follow a few
simple rules:
1.
2.
Use the right type of soldering iron. A 25 to
40-watt
pencil soldering iron with a 1/8" or
3/16" chisel or pyramid tip works best.
Keep
the soldering iron tip clean. Wipe it often
on a wet sponge or cloth ; then apply solder to
the tip to give the entire tip a wet look. This
process is called tinning , and it will protect the
tip and enable you to make good connections .
When solder tends to "ball" or does not stick to
the tip, the tip needs to be cleaned and retin-
ned.