Harman Kardon 630 User manual

The

Harman-Kardon

_

Model

630

AM/FM/Stereo

FM

Solid

State

Receiver

Technical

Manual

harman

/kardon

AM

CIRCUIT

BOARD

FM

IF

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FM

STEREO

(MPX)

CIRCUIT

BOARD

Test

Point

FM

composite

signal

Input

(green)

from

Muting

Board

(6)

+B5,

14V

(orange)

Audio

Output

R-ch.

To

Func.

switch

{2R

-2}.

(green)

To

chassis

ground

{black}

Audio

Output

L-ch.

To

Func.

switch

{2R

-8).

{biue)

To

Stereo

Beacon

Lamp

(yellow)

To

Mode

switch

(violet)

to

FM

IF

board

(9)

(light

blue).

EQUALIZER

AMPLIFIER

CIRCUIT

BOARD

R-ch.

Output

To

Func.

switch

thru

R918

(green)

R-ch.

Phono

Input

(white)

+B3.

21V

{brown)

To

chassis

ground

{black}

L-ch.

Phono

Input

(yellow)

L-ch.

Output

To

Func.

switch

thru

R917

(blue)

ALIGNMENT

PROCEDURE

FM

STEREO

ALIGNMENT

PROCEDURE

PRECAUTIONS

1.

Always

disconnect

the

chassis

from

power

line

when

soldering.

Turning

the

power

switch

OFF

is

not

enough.

Power

line

leakage

passing

through

the

heating

element

may

destroy

the

transistors.

2.

Never

attempt

to

do

any

work

on

the

transistor

amplifiers

without

first

disconnecting

the

AC

line

cord

and

waiting

until

the

power

supply

filter

capacitors

have

discharged.

3.

Replacement

for

output

and

driver

transistors,

if

necessary,

must

be

made

from

the

same

beta

group

as

the

origina!

type.

4.

If

one

output

transistor

burns

out

(open

or

short)

always

remove

all

the

output

transistors

in

that

channel

and

check

the

bias

adjustment,

the

control

and

other

parts

in

the

network

with

an

ohm-meter

before

inserting

a

new

transistor.

All

transistors

in

one

channel

will

be

destroyed

if

the

base

biasing

circuit

is

open

on

the

emitter

end.

|

9.

When

mounting

a

replacement

power

transistor,

be

sure

that

the

bottom

of

the

flange,

the

mica

insulators

and

the

surface

of

the

heat

sink

are

free

of

foreign

matter,

for

they

may

cause

transistors

failure.

6.

Silicon

grease

must

be

applied

between

the

transistor

and

the

mica

insulator,

and

between

the

mica

insulator

and

the

heat

sink

for

better

heat

conduction.

INSTRUMENTS:

FM

Signal

Generator,

AC

VTVM

and

Oscilloscope.

NOTE:

The

FM

IF

Amplifier

must

be

completed

before

attempting

this

FM-Stereo

Alignment.

Poor

IF

alignment

will

result

in

poor

Multiplex

Adjustment.

Set

Separation

Adj.

VR302

{on

MPX

board)

to

max-position

before

starting

this

procedure.

Set

Selector

switch

to

‘‘FM

STEREO”.

Connect

Stereo

Generator

to

FM

antenna

terminals.

STEREO

GENERATOR

OUTPUT

INDICATOR

ae

CONNECTED

TO

mower

)

ADJUST

FOR

MODULATION

RF

DEVIATION

2—

5%

Oscilloscope

to

L301,

302

Maximum

Amplitude

Test

Point

5

and

303

on

scope.

(on

MPX

board)

5%

ee

aE

Re

VR301

Stereo

Beacon

Lamp

just

comes

on.

Pilot

9%

Oscilloscope

and

VTVM

L302

Maximum

and

undis-

Signal

70%

|

to

Left

channel

TAPE

torted

sine

wave

on

OUT

jack.

scope.

Oscilloscope

and

VTVM

Minimum

reading

on

|

to

Right

channel

TAPE

-

VTVM.

OUT

jack.

.

Same

as

in

step

3.

Repeat

steps

4

and

5

until

no

further

improvement

is

possible.

And

adjust

Separation

Adj.

VR302,

if

necessary.

FM

MUTING

ADJUSTMENT

INSTRUMENTS:

FM

Signal

Generator

and

Oscilloscope.

Set

Selector

switch

to

“FM”

position.

OUTPUT

INDICATOR

CONNECTED

TO

Oscilloscope

to

TAPE

OUT

19KHz

Pilot

signal

only

Composite

1

KHz

signal

to

Left

channel

only

Composite

1

KHz

signal

to

Right

channel

only

ADJUST

%

*#

©

€

*¥

Check

output

switch

10

uV

“OF

F’’

Turn

to

Clockwise

until

the

output

just

disappears.

Muting

Level

control

VR

901

(on

chassis)

switch

Freq.

Adju.

L703

(on

Muting

circuit

board)

Adjust

L703

to

obtain

symmetrical

output

when

detuned

upper

and

lower

side.

Repeat

step

2.

FM

ALIGNMENT

PROCEDURE

instruments:

FM

Sweep

Generator,

FM

Signal

Generator,

AC

VTVM

and

Oscilloscope.

NOTES:

Set

Selector

switch

to

“FM”

GENERATOR

STEPS

CONNECTED

ro

|

FREQUENCY

4

AM

ALIGNMENT

PROCEDURE

Instruments:

AM

Signal

Generator

and

AC

VTVM.

NOTES:

Set

Selector

switch

to

AM.

Input

signal

must

be

kept

as

low

as

possible

to

avoid

AVC

action.

GENERATOR

STEPS

COUPLING

FREQUENCY

TUNING

DIAL

SETTING

OUTPUT

INDICATOR

CONNECTED

TO

ADJUST ADJUST

FOR

FM

Sweep

Generator

Quiet

point

Oscilloscope

T104,

103,

Maximum

and

on

band

to

junction

of

102

&

101

Balanced

S

to

junction

R127

and

C126

(on

FM

IF

curve

on

of

C907

&

(on

FM

IF

board)

scope.

C908

(FM

IF

Top

and

Input)

Bottom

Disconnect

FM

Sweep

Generator

and

connect

FM

Signal

Generator

to

FM

antenna

terminals.

FM

Signal

Generator

Tune

for

Oscilloscope

and

T2,

Top

&

Maximum

and

maximum

AC

VTVM

Bottom

undistorted

to

FM

antenna

98MHz

output

to

TAPE

OUT

(on

Front-

amplitude

terminals

(400Hz

point.

jack

end)

on

scope.

Signal

strength

100%

Touch

up

must

be

kept

mod.)

T101,

102

—3db

of

103

&

104

limitter

—

if

necessary.

|

satulation.

'

90MHz

L2

(OSC),

'

Maximum

(400

Hz

L1

(RF)

&

reading

on

100%

T1

(ANT)

VTVM

mod.)

(on

Front-

end)

106MHz 106MHz

_

CT3

(OSC),

|

(400Hz

CT2

(RF)

&

100%

CT1

(ANT)

mod.)

(on

Front-

end)

Repeat

steps

4

and

5

until

no

further

improvement

is

noticed.

TUNING

DIAL

SETTING

OUTPUT

INDICATOR

CONNECTED

TO

ADJUST

FOR

Tr201

Base

455

KHz

Non

inter-

AC

VTVM

T203,

202

Maximum

(on

AM

IF

(400

Hz

fering

at

to

TAPE

OUT

and

201

reading

board)

through

30%

mod.)

low

end

of

jack.

‘(on

AM

IF

on

VTVM.

a

O.1mfd

scale.

board)

capacitor

Connect

to

600

KHz

600

KHz

L201

(OSC)

short

loop

(400

Hz

{on

AM

IF

of

wire.

30%

mod.)

board)

&

Radiate

L901

(ANT

signal

into

coil).

ferrite

loopstick

antenna.

1400

KHz

1400

KHz

CT5

(OSC

(400

Hz

trim.)

&

3

30%

mod.)

CT4

(ANT

trim.)

{on

Front-end)

4

Repeat

steps

2

and

3

until

no

further

improvement

is

noticed.

PREDRIVER/DRIVER

ADJUSTMENT

PRE-DRIVER/DRIVER

ADJUSTMENT

1.

2.

3.

6.

Set

BALANCE,

BASS

and

TREBLE

controls

to

mid-position.

Set

MODE

switch

to

‘‘STEREO’’,

SPEAKER

switch

to

““ON’’

and

SELECTOR

switch

to

“AUX”

position.

Connect

8

ohm,

50

watts

resistor

across

Left

speaker

terminals.

Then,

in

parallel

with

the

load

resistor,

connect

a

VTVM

and

the

vertical

input

leads

of

an

oscilloscope.

.

Connect

an

audio

signal

generator

to

Left

channel,

AUX

input

and

apply

1,000

Hz

(sine

wave)

signals.

.

Rotate

Volume

Control

counterclockwise

to

get

0.9

volts

RMS

across

8

ohm

(0.1

watt

output)

on

VTVM.

Agius

crossover

distortion

by

turning

Idling

Adjust

Control

VR601

(on

driver

circuit

board)

until

ideal

response

appears

on

scope

(see

Figure

1).

Or

Adjust

idling

current

using

a

DC

mitli-volt

meter

across

R617

resistor

(on

driver

circuit

board),

rotate

VR60O1

to

obtain

a

10mV

reading

on

DC

milti-volt

meter

=

no

signal

input

=

(see

Figure

2).

Repeat

the

same

steps

3

thru

5

as

above

for

Right

channel.

FM

MONO-STEREO

AUTOMATIC

SWITCHING

LEVEL

ADJUSTMENT

PROCEDURE

oh

WN

=

~~

o>

.

Connect

a

VTVM

and

Oscilloscope

to

the

TAPE

OUT

jack

(Left

or

Right).

.

Feed

the

FM

signal

with

Stereo

modulation

into

the

FM

ANT

terminals.

.

Set

the

frequency

at

98

MHz

(when

there

are

disrupting

signal,

choose

another

setting).

.

Set

the

MODE

switch

to

STEREO

and

FUNCTION

switch

to

FM

MANUAL.

.

Turn

CCW

the

MONO

—

STEREO

Auto-switching

Level

Adj.

VR101

(on

FM

IF

board):

this

is

a

condition

in

which

Auto-switching

does

not

function.

.

Adjust

the

FM

MPX

so

that

the

distortion

and

separation

will

be

best.

.

Adjust

the

VR101

so

that

when

the

antenna

input

level

is

30uV

or

more,

Stereo

will

switch

in

and

when

the

input

is

below

the

30uV

level,

Mono

will

switch

in.

.

After

adjustment,

check

to

make

sure

that,

indeed,

when

the

antenna

input

fevel

exceeds

30uV,

Stereo

will

switch

in.

POWER

SUPPLY

CIRCUIT

BOARD

-B1,

—32V

+B1,

32V

+B2.

32V

—B2.

—32V

To

C903

©

To

C902

@

To

C904

©

To

C905

@

Q902

(E)

Q801

(C)

Q903

(C)

Q904

{E}

NOTES:

1.

RESISTANCE

IS

SHOWN

IN

OHMS.

2.

CAPACITANCE

IS

SHOWN

IN

MFD.

AC

Input

To

chassis

AC

Input

from

Power

Trans.

ground

from

Power

Trans.

7901

T902

POWER

SUPPLY

(TUNER

AND

PREAMP)

VERSION

1

VERSION

2

To

C906

+B3.

21V

+B3

21V

NOTES:

1.

RESISTANCE

IS

SHOWN

IN

OHMS.

2.

CAPACITANCE

IS

SHOWN

IN

MFD.

AC

INPUT

'

; ,

TO

CHASSIS

FROM

POWER

XFMR

TO

CHASSIS

To

chassis

AC

input

To

chassis

ground

from

Power

Trans.

ground

GND

T9OI

(SEC)

GND

T901

(Sec.)

'

TOP

VIEW

2)

@

@ @

©

© ®

(

QAO

@®®

©

@

@®

09 Mw

33)

@)

0

@O@®

O®G

OOO

OOOO

OHOO

TUNING

KNOB

FUNC.

SELECTOR

SWITCH

VR502,

VOLUME

CONTROL

VR501,

BALANCE

CONTROL

~VR503,

TREBLE

CONTROL

VR504,

BASS

CONTROL

CONTOUR

SWITCH

&

FM

MUTING

SWITCH

TAPE

MON.

SWITCH

&

MODE

SWITCH

HIGH-CUT

SWITCH

&

DOLBY

SWITCH

SPEAKERS

SWITCH

POWER

SWITCH

DIAL

POINTER

C903,

RIPPLE

FILTER

C902,

RIPPLE

FILTER

C904,

RIPPLE

FILTER

8)

©®©®O®®OO®G®O®®O®©OSOOO®

7901,

POWER

TRANSFORMER

(R-CH)

C905,

RIPPLE

FILTER

7902,

POWER

TRANSFORMER

(L-CH)

MPX

CIRCUIT

BOARD

C906,

RIPPLE

FILTER

0626,

DRIVER

TRANSISTOR

(R-CH)

0625,

DRIVER

TRANSISTOR

(R-CH)

PREDRIVER/DRIVER

CIRCUIT

BOARD

VR621,

IDLING

CURRENT

ADJ.

(R-CH)

L901,

AM

LOOPSTICK

ANTENNA

Q605,

DRIVER

TRANSISTOR

(L-CH)

VR601,

IDLING

CURRENT

ADJ.

(L-CH)

Q606,

DRIVER

TRANSISTOR

L301,

MPX

COIL,

19KHz

TUNE

L302,

MPX

COIL,

19KHz

TUNE

8)

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Sy

©@©®OSO®©G®OOOO®

OOO

7203,

AM

IFT

(3rd)

1202,

AM

IFT

(2nd)

EQUALIZER

AMP

CIRCUIT

BOARD

7201,

AM

IFT

(1st)

L201,

AM

LOCAL

OSCILLATOR

COIL

L304,

MPX

38KHz

FILTER

AM/FM

FRONT

END

L305,

MPX

38KHz

FILTER

L303,

MPX

COIL,

38KHz

TUNE

T101,

FM

IFT

(1st)

102,

FM

IFT

(2nd)

T103,

FM

IFT

(3rd)

T104,

FM

IFT

(RATIO)

TONE

AMP

CIRCUIT

BOARD

BOTTOM

VIEW

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VR901,

FM

MUTING

LEVEL

ADJ.

FM

MUTING

CIRCUIT

BOARD

SPEAKER

SYSTEM

—1

TERMINAL

STRIP

L703,

MUTING

COIL

SPEAKER

SYSTEM

—2

TERMINAL

STRIP

REGULATOR

CIRCUIT

BOARD

AC

OUTLET

SPEAKER

FUSE,

L-CH

SPEAKER

FUSE,

R-CH

QBE@OQ©

©©

©®

AC

FUSE

POWER

SUPPLY

CIRCUIT

BOARD

FOR

TUNER

&

PREAMP.

D803,

RECTIFIER

POWER

SUPPLY

CIRCUIT

BOARD

FOR

POWER

AMP.

D804,

RECTIFIER

D802,

RECTIFIER

D801,

RECTIFIER

HEADPHONE

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Harman Kardon 630 User manual

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