10
Step 1:
1.
Without soldering any components, insert all of the resistors, capacitors,
inductors and diodes into their locations on the PCB in accordance with the
values printed on the PCB next to the number of the component. (Figure 1)
When inserting each component, make sure that the component is pulled
down as close to the surface of the PCB as possible. In other words, there
should be as little space as possible between each component and the surface
of the PCB. As you insert each component, make an angle bend on each lead
on the bottom of the PCB so that the component will not fall out and will
remain in position until it is soldered. (Figure 2)
All other capacitors, resistors and inductors can be inserted without
regard to polarity orientation.
2.
After making certain that all components are in their proper place, turn the
PCB over and apply a small amount of flux on each solder hole that has a lead
protruding through it. (Figure 4) It is important that you can see the flux on
each solder joint to make sure enough has been applied.
Special Note!
When inserting capacitors and diodes, there are two types of components that
must be inserted in a particular orientation on the PCB: These are the electrolytic
capacitors, C4, C12, C17, C21, C22 and C27; and the two diodes, D1 and D2.
Electrolytic capacitors have polarity. This means that the longer lead is ―positive‖
and the shorter lead is ―negative‖. (Figure 3) This is also marked on the
electrolytic capacitor by an arrow running along the side of the capacitor on the
side that is negative. When inserting and soldering the capacitor onto the PCB,
the negative, shorter lead must
be inserted into the
round
pad marked ―
-
―. The
positive, longer lead must be inserted into the
square
pad marked ―
+
‖.
Diodes D1 and D2 have to be inserted in a particular way too. One end of the
diode body is marked with a stripe. This is the ―cathode‖ end and must be
inserted onto the PCB in accordance with the stripped end of the diode printed
on the PCB. The other end of the diode is the ―anode‖ end and is inserted on the
end that is not marked with a stripe.
