Heathkit IO-4205 - Step-By-Step Assembly

In the following steps, you will be
given detailed
instructions on how to
install
and solder the first part on the
circuit board. Read and perform each
step carefully.
Then use the same pro-
cedure whenever you install parts on a
circuit board.
NOTE: Only a
portion of the circuit
board is
shown in some of the follow-
ing Pictorials.
The small "Identifica-
tion Drawing" at the top of the page
shows the area ofthe circuit board to be
assembled.
( )
Position
the circuit board as
shown with the printed side (not
the foil side) up.
NOTE:
When you install a component
that has its value printed on it, position
the value marking up, so it can be eas-
ily
read . Diodes should be mounted
with their type or part number up, if
possible.
Hold a 910 k.O (Wht-Brn-Yel) re-
sistor
with long-nose pliers and
bend the leads straight down to fit
the hole spacing on the circuit
board .
( ) R101B:
Push the leads through
the holes at the indicated location
on the circuit board. The end with
color bands may be positioned
either way .
Press
the resistor against the cir-
cuit board. Then bend the leads
outward slightly to hold the resis-
tor in place .
STEP-BY-STEP ASSEMBLY
Page 11
IDENTIFICATION
DRAWING
CONTINUE<:/
The steps performed in this Pictorial are
in this area of
the circuit board.
PICTORIAL 1-1
( ) Turn the circuit board over and
solder the resistor leads to the foil
as follows:
1.
Push the soldering iron tip
against both the lead and the
circuit board foil. Heat
both
for two or three seconds.
SOLDERING
iRON
COMPONENT
/)
LEAD w
~~~
BOARD
2. Then apply solder to the
other side of the connection .
IMPORTANT: Let
the heated
lead
and the circuit board foil
melt
the solder.
SOLDERING
IRON
SOLDER
FOIL'\_
3. As the solder begins to melt,
allow it
to flow around the
connection . Then remove the
solder
and the iron and let the
connection cool.
FOIL
SOLDERING
IRON
( ) Cut off the excess lead lengths
close to
the connection . WARN-
ING: Clip
the leads so the ends
will not fly toward your eyes.
( ) Check each connection. Compare
it to
the illustrations on Page 12 .
After you have checked
the solder
connections, proceed
with the as-
sembly
on Page 13. Use the same
soldering procedure for each
connection .