Harman Kardon TA12 Owners Manual - Page 9

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Overheating:

When

using

the

soldering

iron

(35

watts

or

less),

do

not

overheat

the

component

terminals

or

the

copper

foil.

Excessive

heat

(applying

soldering

iron

longer

than

necessary,

using

a

higher

wattage

soldering

iron

than

recommended,

or

using

a

solder

gun)

may

cause

the

bond

between

the

board

and

foil

to

break.

This

will

necessitate

replacement

or

repair

of

the

foil

connection.

Tools

and

Materials

Required:

(1)

Low

wattage

soldering

iron

with

a

small

point

or

wedge

(rating

should

not

exceed

35

watts).

(2)

Small

wire

brush.

(3)

60

0

J

0

tin,

40%

lead,

low

temperature

rosin

core

solder.

(4)

Thin

bladed

knife.

(5)

Small

wire

pick,

or

soldering

aid.

REPLACING

COMPONENTS

Soldering

Replacement

Component

to

Old

Leads:

Cut

the

leads

where

they

enter

the

defective

com-

ponent.

Clean

off

the

ends

of

the

leads,

leaving

as

much

of

the

leads

as

possible.

Make

a

small

loop

in

each

lead

of

the

replacement

component

and

slide

the

loops

over

the

remaining

leads

of

the

old

component.

Cau-

tion

should

be

taken

not

to

overheat

the

connection

since

the

copper

foil

may

peel

or

the

original

component

lead

may

fall

out

of

the

board.

This

is

possible

due

to

heat

transfer

through

the

leads.

The

lead

length

of

the

re-

placement

part

should

be

kept

reasonably

short

to

pro-

vide

some

mechanical

rigidity.

Unsoldering

and

Resoldering

Components:

To

test

a

component

or

if

the

component

is

mounted

in

such

a

manner

that

the

above

method

can

not

be

used

(such

as

vertically

mounted

capacitors,

etc.)

the

com-

ponent

can

be

replaced

by

unsoldering

it.

This

proce-

dure

should

be

used

whenever

it

is

necessary

to

unsolder

any

connections

to

replace

defective

components.

(a)

Heat

the

connection

on

the

wiring

side

of

the

board

with

a

small

soldering

iron.

When

the

solder

melts,

brush

away

the

solder.

Do

not

overheat

the

'con-

nection.

In

the

process

of

removing

the

solder,

caution

must

be

taken

to

prevent

excessive

heating.

Therefore,

do

not

leave

the

iron

on

the

connection

while

brushing

away

the

solder.

Melt

the

solder,

remove

the

iron

and

quickly

brush

away

the

solder.

It

may

require

more

than

one

heating

and

brushing

process

to

completely

re-

move

the

solder.

(b)

Insert

a

knife

blade

between

the

wiring

foil

and

the

"bent

-over"

component

lead

and

bend

the

lead

perpendicular

to

the

board.

(It

may

be

necessary

to

apply

the

soldering

iron

to

the

connection

while

performing

'this

step

as

it

is

sometimes

difficult

to

completely

break

the

connection

by

brushing.)

Do

not

overheat

the

con-

nection.

(c)

While

applying

the

soldering

iron

to

the

con-

nections,

"wiggle"

the

component

until

it

is

removed.

(d)

Remove

any

small

particles

of

solder

using

a

clean

cloth

dipped

in

solvent.

(e)

A

thin

fi

lm

of

solder

may

remain

over

the

hole

through

the

board

after

removing

the

component.

Pierce

the

fi

lm

with

the

lead

from

the

new

component

after

heating

the

solder

fi

lm

with

the

soldering

iron.

(f)

Insert

the

leads

of

the

new

component

through

the

holes

provided.

Cut

to

desired

length

and

bend

over

the

ends

against

the

copper

foil.

Resolder

the

con-

nection

with

60/40

low

temperature

solder.

Harman-Kardon

high

fidelity

instruments

incorporate

advanced

production

techniques

as

well

as

advanced

circuit

features.

They

reflect

the

highest

state

of

the

art

of

fine

audio

equipment.

We

hope

your

unit

provides

you

with

many

hours

of

listening

enjoyment.

Our

Customer

Service

Department

is

maintained

to

answer

your

correspondence

about

High

Fidelity

and

to

make

recommendation

of

appropriate

companion

accessories.

Please

feel

free

to

write

without

obligation.

harman

kardon

520

MAIN

STREET

8

WESTBURY.

L.

I..

N.

Y.

Harman Kardon TA12 Owners Manual - Page 9

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