Heathkit IM-4100 - Page 22

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SFR

Install

four

SN7490N

(#443-7)

IC's

|

/

Page

18

Ge-gHEATHKIT

|

DOT

START

@

NOTES:

Ur

lf it

ever

becomes

necessary

to

remove

an

IC

from

its

socket,

use

the

IC

puller.

Insert

its

foot

beneath

the

IC;

then

gently

rock

the

tool

back

and

forth

to

lift

the

IC.

PIN

1

Detail

2-5A

Refer

to

Detail

2-5A.

Then,

as

you

install

each

IC

in

the

following

steps,

Position

the

pin

1

end

of

the

IC

at

the

end

of

the

socket

where

the

dot

5

aa

aS

4

Se

is

screened

on

the

circuit

board.

Then

insert

the

IC

leads

into

the

cS

socket

and

push

the

IC

down

into

re

!

\

(or

Re

O

SS)

c

a

BS

ce

ge)

See

a

ees

ee

eee

ey

me

SE

|

nS

at:

I1C4,

IC5, IC6,

and

IC7.

(These

ire

IC’s

may

be

marked

SN7490AN.)

nS

«|

HyYyy

(4)

Install

seven

SN7490N

(#443-7)

fr

We

YY

a

7

z.

LA

IC’s

at:

1C19,

1C20,

1C21,

1C22,

a

LL

Yj

1C23,

1C24,

and

1C25.

fi

re

ee

UY}

Install

five

9368

(#443-694)

IC’s

at

IC8,

1C9,

1010, 1C11,

and

1C12.

PICTORIAL

2-5