Heathkit IO-4205 - Page 28

Page 26
Refer toPictorial1-15 (Illustration Booklet, Page 3) for
the following steps.
NOTE:
When you install a transistor or integrated
circuit (I C) in the following steps, be sure to match the
pin 1 end of the transistor or IC to the index mark on
the circuit board. See Detail1-15A.
( ~ Q101A: Install a 5566 transistor ( #417 -902) at
location Q101A.
( ) Q101B: Install a 5566
transistor (#417-902) at
location Q101B.
( -1 Q102A: Install a 5566 transistor (#417-902) at
location Q102A.
( j Q102B: Install a 5566 transistor ( #417 -902) ar
/ location Q102B.
( ) U102: Install a
7472Ic:; (#443-4) at location
I U102.
(
~ U101: Install a 7400 IC (#443-1) at location
/
U101.
(
SW2B- R3B: Refer to Detail1 5B and mount a
rotary
switch with 5000 0 (5 k) control (#63-
1316) at its location on the printed side of the
circuit board as follows:
1. Carefully
align the pins of the front wafer (A)
with their holes in the circuit board.
SMALL
·~~~~
ulf)~ ~
DOT
PIN1 PIN1
PIN
2. Fit the pins of each switch wafer, one wafer at a
time,
into their board holes until all the switch
and control pins are in place. Then push the
switch down tight against the circuit board.
3. Carefully
turn the circuit board over and solder
only the end pins of each wafer to the foil. In-
spect these switch pins to make sure all the pins
are
tight against the printed side of the circuit
board.
If they are not, reheat the connection and
push the switch tight against the board. Then
solder all the remaining switch and control pins
to the foil.
(
'-') / SW2A - R3A: In the same manner, install the
other rotary switch with 5000 0 (5 k) control
(#63-1316) at its location
on the circuit board.
NOTE:
When you are instructed to prepare wires, as
in the next step , cut the specified color wire to the
indicated length and remove 1/4" of insulation from
each
end .
Prepare the following brown wires. The wires
are
listed in the order they will be used.
3"
2"
3"
2-1/4"
RIDGE NOTCH _ __ -- ~
~~ 0{1 < ~~
PIN 1 pIN 1 ~ .
Detail1-15A