Introduction
Assembly of your LP-535 Logic Probe Kit will prove to be
an exciting project and give you much satisfaction and
personal achievement. If you have experience in soldering
and wiring techniques, then you should have no problem
with the assembly of this kit.
Care must be given to
identifying the proper components and in good soldering
habits. Above all, take your time and follow these easy
step-by-step instructions.
Remember, “An ounce of
prevention is worth a pound of cure”.
Avoid making
mistakes and no problems will occur.
Safety Procedures
• Wear eye protection when soldering.
• Locate soldering iron in an area where you do not have to
go around it or reach over it.
• Do not hold solder in your mouth. Solder contains lead
and is a toxic substance. Wash your hands thoroughly
after handling solder.
• Be sure that there is adequate ventilation present.
Assemble Components
In all of the following assembly steps, the components
must be installed on the top side of the PC board unless
otherwise indicated. The top legend shows where each
component goes.
The leads pass through the
corresponding holes and the board is turned to solder the
component leads on the foil side.
Solder immediately
unless the pad is adjacent to another hole which will
interfere with the placement of the other component. Cut
excessive leads with a diagonal cutter. Then, place a
check mark in the box provided next to each step to
indicate that the step is completed. Be sure to save the
extra leads for use as jumper wires if needed.
Soldering
The most important factor in assembling your logic probe
kit is good soldering techniques.
Using the proper
soldering iron is of prime importance. A small pencil type
soldering iron of 25 - 40 watts is recommended. The tip of
the iron must be kept clean at all times and well
tinned. Many areas on the PC board are close together
and care must be given not to form solder shorts. Size
and care of the tip will eliminate problems.
For a good soldering job, the areas being soldered must
be heated sufficiently so that the solder flows freely. Apply
the solder simultaneously to the component lead and the
component pad on the PC board so that good solder flow
will occur.
Be sure that the lead extends through the
solder smoothly indicating a good solder joint. Use only
rosin core solder of 63/37 or 60/40 alloy.
DO NOT USE ACID CORE SOLDER! Do not blob the
solder over the lead because this can result in a cold
solder joint.
Heat Sinking
Electronic components such as transistors, IC’s, and
diodes can be damaged by the heat during soldering. Heat
sinking is a way of reducing the heat on the components
while soldering. Dissipating the heat can be achieved by
using long nose pliers, an alligator clip, or a special heat
dissipating clip.
The heat sink should be held on the
component lead between the part and the solder joint.
-4-
CONSTRUCTION
Mount Part
Bend Leads to Hold Part
Solder and Cut Off Leads
Foil Side
Rx - 100
Ω
5% 1/4W Resistor
(brown-black-brown-gold)
Heat Sink
(this can be ordered as part of Elenco’s Solder Ease
Kit Model SE-1).
Soldering Iron
Solder
Heat Sensitive
Component (Diode)
PC Board
