Harman Kardon TX20 Owners Manual - Page 5

ADJUSTMENTS

System

Hum

or

Noise:

In

any

high

fi

delity

installation,

hum

may

be

caused

by

the

interconnection

of

a

record

changer,

tuner

and

amplifier,

as

a

result

of

the

cables

and

different

grounds.

A

good

way

to

eliminate

this

problem

is

to

fi

rst

disconnect

everything

but

the

speakers

from

the

amplifier,

and

listen

for

hum.

Try

reversing

the

amplifier

power

plug.

Now

plug

in

the

tuner.

If

hum

appears,

try

reversing

the

tuner

power

plug,

and

try

connecting

a

wire

from

the

tuner

chassis

to

the

amplifier

chassis.

In

this

way,

connect

the

record

player,

tape

deck

and

other

devices

in

turn.

Note

that

hum

may

be

picked

up

by

defective

interconnecting

cables,

and

by

interconnecting

cables

running

too

close

to

power

cables.

MAINTENANCE

AND

REPAIRS

Fuse:

In

the

event

of

a

potentially

damaging

failure

of

tubes

or

components,

the

Model

TX20

is

protected

by

a

,X1

ampere,

type

3AG

fuse,

located

on

the

rear

of

the

unit.

If

this

fuse

is

blown,

it

should

be

replaced

only

with

one

of

the

same

rating.

Replacing

with

a

fuse

of

higher

rating

will

not

protect

the

tuner,

and

may

result

in

severe

damage,

which

will

not

be

covered

by

the

factory

warranty.

Routine

Maintenance:

Due

to

the

conservative

design

and

high

quality

components

of

the

Model

TX20,

no

routine

maintenance

other

than

yearly

tube

checking

is

advised.

Repair:

Only

the

most

qualified

service

technician

should

be

employed,

as

special

equipment

and

training

is

required

to

properly

service

a

high

fi

delity

tuner.

This

manual

contains

information

of

great

value

to

the

repairman,

and

should

be

kept

available.

Factory

Warranty

Stations

are

maintained

in

most

major

cities.

For

the

ad-

dress

of

the

nearest

one,

or

for

any

other

information

relating

to

your

Harman-

Kardon

products,

write

to

the

attention

of

the

Customer

Service

Department,

Harman-Kardon,

Inc.,

520

Main

St.,

Westbury,

N.

Y.

Be

sure

to

include

the

model

and

serial

number

of

the

set

in

question.

A

short

description

of

your

complete

in-

stallation

is

often

of

help

in

answering

your

questions.

FUNCTION

SWITCH

SETTING

SIGNAL

GENERATOR

SIGNAL

INPUT

POINT

OUTPUT

INDICATOR

CONNECT

INDICATOR

TO:

DIAL

SETTING

ADJUST

OUTPUT

INDICATION

FREQ.

MOD.

AM

455

KC

30%

AM

AM

RF

GANG

AC-VTVM

OR

SCOPE

TUNER

OUTPUT

1600

KC

2

AM

IF

TRANS.

MAXIMUM

OUTPUT

AM

1500

KC

30,

AM

AM

ANT.

TERM.

AC-VTVM

OR

SCOPE

TUNER

OUTPUT

1500

KC

OSC

&

ANT

.TRIMMERS

MAXIMUM

OUTPUT

AM

600

KC

30%

AM

AM

ANT.

TERM.

AC-VTVM

OR

SCOPE

TUNER

OUTPUT

600

KC

OSC

COIL

&

LOOPSTICK

MAXIMUM

OUTPUT

AM

1500

KC

REPEAT

STEP

2

AM

ALIGNMENT

PROCEDURE

I

FUNCTION

SWITCH

SETTING

SIGNAL

GENERATOR

SIGNAL

INPUT

POINT

OUTPUT

INDICATOR

CONNECT

INDICATOR

TO:

DIAL

SETTING

ADJUST

OUTPUT

INDICATION

FREQ.

MOD.

FM

10.7

MC

300KC

FM

60

CPS

FM

MIXER

GANG

AC-VTVM

OR

SCOPE

TEST

POINT

3

FM

IF

TRANS.

MAX

GAIN

&

SYMMETRY

FM

10.7

MC

300KC

FM

60

CPS

FM

MIXER

GANG

AC-VTVM

OR

SCOPE

TUNER

OUTPUT

DISCR.

TRANS.

S

PATTERN

OF

MAX

GAIN

&

SYMM.

FM

106

MC

300KC

FM

60

CPS

FM

ANT.

TERMINAL

AC-VTVM

OR

SCOPE

TEST

POINT

106

MC

106

MC

OSC

RF,

MIXER

TRIMMERS

MAXIMUM

OUTPUT

FM

90

MC

300KC

FM

60

CPS

FM

ANT.

TERMINAL

AC-VTVM

OR

SCOPE

TEST

POINT

90

MC

OSC,

RF,

MIXER

COILS

MAXIMUM

OUTPUT

FM

ALIGNMENT

PROCEDURE

Harman Kardon TX20 Owners Manual - Page 5

ADJUSTMENTS, System, Noise, MAINTENANCE, REPAIRS, Routine, Maintenance, Repair

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