Heathkit IM-4100 - Page 15

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Ga

guHEATHKIT®

Page

11

‘ASSEMBLY

NOTES

Before

you

start

to

assemble

this

kit,

read

the

wiring,

soldering,

and

step-by-step

assembly

information

in

the

‘’Kit

Builders

Guide.”

The

illustrations

in

this

Manual

are

called

Pictorials

and

Details.

Pictorials

show

you

the

result

of

performing

a

group

of

assembly

steps.

Details

generally

show

how

to

perform

a

single

step.

When

you

are

directed

to

refer

to

a

certain

Pictorial

‘‘for

the

following

steps,’’

continue

using

that

Pictorial

until

you

are

referred

to

another

Pictorial

for

another

group

of

steps.

Read

the

entire

step

before

you

perform

the

operation;

then

follow

the

instructions

carefully.

Position

all

parts

as

shown

in

the

Pictorials.

Install

the

components

on

the

component

(lettered)

side

of

the

circuit

board

in

the

circuit

board

Pictorials

and

then

solder

the

leads

to

the

foil

side.

Resistors

are

designated

by

their

resistance

value

in

Q

(ohms),

kQ

(kilohms),

or

MQ

(megohms)

and

color

code.

Capacitors

will

be

designated

by

their

capacitance

value

(in

pF

and

uF)

and

type

(disc,

tantalum,

or

electrolytic).

Position

electrolytic

and

tantalum

capacitors

only

as

shown.

SOLDERING

IRON

TIP

Due

to

the

small

foil

area

around

the

circuit

board

holes

and

the

small

areas

between

foils,

use

the

utmost

care

to

prevent

solder

bridges

between

adjacent

foil

areas.

Use

only

a

minimum

amount

of

solder

and

use

no

larger

than

a

40-watt

soldering

iron

with

a

small

tip.

Allow

it

to

reach

operating

temperature,

and

then

apply

it

only

long

enough

to

make

a

good

solder

connection.

If

a

small

wattage,

small-tip

soldering

iron

is

not

available,

proceed

as

follows:

Be

sure

your

soldering

iron

is

cool.

Wrap

the

large

bare

wire

(supplied)

tightly

around

the

soldering

iron

tip

as

shown

in

Figure

1.

Allow

approximately

1/4”

of

wire

to

extend

beyond

the

end

of

the

soldering

iron.

Cut

the

wire

end

to

a

chisel

shape

as

shown.

Occasionally

apply

solder

to

the

turns

of

large

bare

wire

to

achieve

a

good

heat

transfer.

Wipe

the

soldering

iron

tip

often

on

a

damp

cloth

or

sponge.

It

is

a

good

habit

to

wipe

the

iron

each

time

you

solder

a

group

of

connections.

The

soldering

iron

tip

must

be

clean

of

oxidation

and

have

a

bright

thin

solder

coat.

SAFETY

WARNING:

Avoid

eye

injury

when

you

cut

off

excess

lead

lengths.

Hold

the

leads

so

they

cannot

fly

toward

your

eyes.

LARGE

BARE

WIRE

Figure

1