Heathkit
NOTE: The pin 1 end of inline inte
grated circuits may be marked in a
number of ways; with a notch, triangle,
dot, the numeral 1, etc.
SHALL
INBEMTATIOM
CONTINUED
PIN 1
Be sure you install each of the follow
ing IC’s so its pin 1 end is toward the
index mark on the circuit board.
Before you apply downward pressure
to the IC, make sure each pin is cen
tered in its proper socket hole. Handle
IC’s with care as their pins are very
easily bent.
Should it ever become necessary to
remove an IC, use a screwdriver and
insert it beneath the IC; then gently
rock it up and down to lift the IC.
( ) U6: 7438 integrated circuit
(#443-77).
( ) U5: 74LS30 integrated circuit
(#443-732).
( ) U4: 74LS04 integrated circuit
(#443-755).
( ) U3: 74LS74 integrated circuit
(#443-730).
( ) U2; 74LS240 integrated circuit
(#443-754).
PICTORIAL 1-5
