Harman Kardon 730 User manual

The Harman/Kardon

Model 730

AM/FM/Stereo

Solid State Receiver

harman/kardon

PRECAUTIONS

Always disconnect

the

chassis from power line when soldering. Turning

the

power switch

OFF

not

enough.

Power line leakage passing through

the

heating element may destroy

the

transistors.

2. Never

attempt

any work

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

the

original

type.

one

output

transistor burns

out

(open

short) always remove

all

the

output

transistors

that

channel

and

check

the

bias adjustment,

the

control and

other

parts

the

network

with an

ohmmeter

before inserting a new

transistor.

All

transistors

one channel will be destroyed if

the

base biasing circuit

open

the

emitter

end.

5. When mounting a replacement power transistor, be sure

that

the

bottom

the

flange,

the

mica insulators

and

the

surface

the

heat sink are free

foreign

matter,

for

they

may cause transistor 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.

7. Fuses must be replaced with size and

type

indicated. Use

other

types

can expose

components

destructive

current

levels.

-2

ALIGNMENT

PROCEDURES

Step

SEPARATION ADJUSTMENT

INSTRUMENTS: Stereo Signal Generator

VTVM

NOTE: Set

Function

Selector Switch

FM.

Connect Signal

Source

Antenna

Terminals.

DIAL

FREQUENCY

SIGNAL

STRENGTH

SETTING

CONNECT

OUTPUT

98MHz

1mV

(60dB)

Tune

for

Zero

VTVM

Left

Right Signal

Volts

Tape

Out

Jack

R220

(15

kohm)

98MHz

VTVM

Right

Left

Signal Tape

Out

Jack

Get best balanced

minimum

output

after

repetitive

check between

right

and

left

above.

STEREO INDICATOR LAMP ADJUSTMENT

INSTRUMENTS: Stereo Signal Generator

NOTE: Set Function Selector Switch

FM.

Connect Signal Source

Antenna

Terminals.

DIAL

FREQUENCY

SIGNAL

STRENGTH

SETTING

OUTPUT

98MHz

32µV

(30dB) Tune

for

Stereo

Indicator

(Stereo Zero

Volts

Lamp

Signal)

R220

(15 k

ohm)

ADJUST

VR302

ADJUST

VR353

Check Pilot level

that

Stereo

Indicator

lights

pilot

level and

that

the

indicator

does

not

light

Return

pilot

level

9% and check Stereo Separation

kHz,

100Hz

and 1

0kHz.

QUIETING METER ADJUSTMENT

INSTRUMENT:

Signal Generator

NOTE: Set

Function

Selector Switch

FM.

Connect

Signal Source

Antenna Terminals.

DIAL

FREQUENCY

SIGNAL

STRENGTH

SETTING

OUTPUT

ADJUST

---

-----

Quiet

Point Quieting Meter VR351

Band

---

-----

VR352

98MHz

20µV

(26dB) Tune

for

Zero VR351

Volts

R220

(15 k

ohm)

-3-

ADJUST FOR

Minimum

Output

Minimum

Output

ADJUST FOR

Light

ADJUST FOR

Needle

Deflect

Over Zero

(to

Right)

Indicate

Zero

Indicate 6

Step

ALIGNMENT

PROCEDURE

INSTRUMENTS:

Signal Generator

modulated

with

1000Hz

100%. (75kHz)

AC/DC VTVM and Oscilloscope.

NOTE: Set

Function

Selector Switch

FM.

Connect ~ignal Source

Antenna

Terminals.

DIAL

CONNECT

OUTPUT

FREQUENCY

SIGNAL

STRENGTH

SETTING

METER

---

-----

Quiet

Point

Oscilloscope

Band

R220

(15

kohm)

---

-----

Near

-1dB

Limiter

Tune

for

Oscilloscope

98MHz

Saturation Zero

Volts

Tape

Out

Jack

R220

(15

ohm)

Repeat Steps 2 and 3

until

further

improvement

noticed.

90MHz

Approx.

10µV

90MHz

Oscilloscope

R220

(15

k ohm)

106MHz

Approx.

0µV

106MHz

Repeat Steps 5 and 6

until

further

improvement

noticed.

90MHz

-3dB

Limiter

Tune

for

VTVM

and Oscilloscope

Saturation Zero

Volts

Tape

Out

Jack

R220

(15kohm)

106MHz

Repeat Steps 8 and 9

until

further

improvement

noticed.

MPX ADJUSTMENT

INSTRUMENT: Frequency

Counter

Signal Generator

NOTE: Set

Function

Selector Switch

FM.

Connect Signal Source

Antenna Terminals.

DIAL

FREQUENCY

SIGNAL

STRENGTH

SETTING

CONNECT

OUTPUT

98MHz

1mV

(60dB) Tune

for

Frequency

Counter

(unmodulated) Zero

Volts

LP301

R220

(15 k

ohm)

-4-

ADJUST

Top

and

Bottom

(on

Front

End)

T201

Top

T201

Bottom

LO(on

Front

End)

TC0(on

Front

End)

LR1

LR2

TCR1

TCR2

TCA

ADJUST

VR301

ADJUST FOR

Maximum

Noise

Zero

Volts

Maximum

Symmetry

on Oscilloscope

Zero

Volts

Zero

Volts

Maximum

Output

Maximum

Output

ADJUST FOR

19kHz

±50Hz

AM ALIGNMENT PROCEDURE

INSTRUMENTS:

Signal Generator modulated

with

400Hz

30%.

VTVM.

Sweep

Generator

and Oscilloscope.

NOTE:

Set

Function Selector Switch

Connect signal source

test

loop placed

radiate signals into

Antenna Loop Stick (L252).

CONNECT

OUTPUT

DIAL

Step

SIGNAL

SOURCE

FREQUENCY

METER

SETTING

ADJUST

FOR

Sweep Generator

455kHz

VTVM

and Oscilloscope Quiet

Point

T252

Maximum

and

Top

R272

(4.7 k

ohm)

Near (Ceramic Flat Pattern

1600kHz

Filter)

Oscilloscope

T253

Maximum

Output

T254

Maximum

Output

4 Repeat Steps 1

through

for

best

sensitivity.

Signal Generator

600kHz

VTVM

and Oscilloscope

600kHz

L251

Maximum

Output

R272

(4.7 k

ohm)

1600kHz 1600kHz

TC1

Maximum

Output

(on

Front

End)

7 Repeat Steps 5 and 6

for

best

dial

accuracy.

Signal Generator

600kHz

VTVM

and Oscilloscope

600kHz

L252

R272

(4.7 k

ohm)

T251

Maximum

Output

1600kHz

TC2

Maximum

Output

TC3

Repeat Steps 8 and 9

for

best

sensitivity.

POWER

AMPLIFIER

IDLING

ADJUSTMENT

INSTRUMENTS:

VTVM

NOTE: Set Function Selector Switch

AUX

Set Volume Control

minimum and set Tone/Balance controls

mid position.

Set Stereo/Mono Switch

Stereo.

Speaker Switch

ON.

Connect

ohm

(50W) resistor across left and right speaker terminals.

Step

CONNECT

OUTPUT

ADJUST

FOR

1 DC

VTVM

between

0418

(collector)

VR402

35mV

±5mV

and

0420

(Collector)

2 DC

VTVM

between

0417

(collector)

VR401

35mV±5mV

and

0419

(Collector)

-5-

SCHEMATIC DIAGRAM -FRONT END

<:t

C")

LLL::::,

LL-o

_,J

.....

I!)

M-..,t

['-..

..--

r-,0

a:~

.....

..__

a._

(()g

---~

I'--

.......

......

.......

.....

.......

......

IDO

a:o

.......

-...J

-6-

......

.....

......

.....

....

"ti

IF~-

botto~

T201

bottom

-----~

1-''

ff.

-I

I··--'

:;o~

r-..::,

•~

~-'

ID'

·-

..._,

~-C)

-~~

"-'

VR401

VR402

;

VR302

T201

top top

R220

k ohm

-----L252

_.,I· TC3

-. '

:!JI

•

TCR1

Si!

,-,,~

~•iw:J

LR1

~~"/'

F''

1l1t

:::

i'.

·11

LR2

.. ,I

L251

I I T251

T252

ti.

T253

T254

...

....

-a

R272

·11

4.7

ohm

VR301

LP301

353

VR352

VR351

WIRING

DIAGRAM-

REGULAR

AND

MULTIVOLTAGE

FRONT END

--7

YELLOW

GREEN

BLACK

ORANGE

C220

C219

-9-

MAIN

RECTIFIER

P.C.

BOARD

LP10

LP11

-~===:::::!J

LP2

LP3

GREEN

RED

PURPLE

VR354

MUTE ADJUST

SW2

MUTING

MODE/CONTROL

CIRCUIT

SIDE B

WHITE

LP603

LAMP

P.C.

BOARD

/:_i

',:

/~Jt:1'~~~4,;§;~;

:E"

BLUE

YELLOW

GRAY

LAG RECTIFIER

P.C.

BOARD

BLACK

BLUE

~--+~B~LA~c~•~•TO

EARTH

MAIN

RECTIFIER

P.C.

BOARD

.___--,

GREEN

SPEAKER

PROTECTOR

-10-

RED

ORANGE

RED

WHITE

GREEN

PURPL

08-t\NGJ:

BLUE

YELLOW

GRAY

BLUE

TO LP19

:::::::::::_.

SUB

RECTIFIER -

RED

P.C.

BOARD

MODE/CONTROL

CIRCUIT

SIDE

BLUE

ORANGE

WHITE

WIRING DIAGRAM

FU5

rG.:.:,R~E:;,;EN:,:_

_________________________________________________

250V

GREEN

BLACK

BLUE

GREEN

TO LP502 BLUE

TONE CONTROL

P.C.

BOARD-="'"-----+

TO CHASSIS

YELLOW

LP503 RED

S01

SWITCHED

(!)

GRAY

MAIN

A~P

IN JACK

(L)

(RI

W.J

LJJ

::J

>===o..=.J

)BLACK

_l!IE--,-+B:;.;L;;:.A.;;q~..L.

LP501

BLACK

,-.rn J2 EARTH

GREEN

'----=:.:a:.~-+--+--SPEAKER

BLUE OUTPUT

.._

(_)

.;;.;;.;;;.=..---4---41---1EARTH

S02

UN SWITCHED

CB1

(R)

PL1

POINTER LAMP

PL9

RED

GREEN

BLACK

PWR

SWITCH

LAMP -~-.....:B~L~U~E

_______

SUB

RECTIFIER

CIRCUIT

SIDE

~r-ll---------1---.:.:G.:.:,R.._EE=,:N.:....;-TO

LP559

PURPLE

560

SWS

(!)

CB2

(L)

SPEAKER

PROTECTOR

,.,:

(!)

CO-AA5

AM/FM

TUNER/

IF,

P.C.

BOARD

TO CO-GG3

FUNCTION SWITCH

L...:~-TO

CO-AA7

AM/FM

TUNER/IF,

P.C.

BOARD

FU6

250V

WIRING DIAGRAM -MULTIVOLTAGE

GREEN

BLACK

WHITE

BLACK

RED

FUS

rG~R~E~E~N

_________________________________________________

_..:;~~

250V

GREEN

BLACK

BLUE

GREEN

TO LP502 BLUE

TONE CONTROL

P.C.

BOARD•=~---+

TO CHASSIS

-13-

S01

SWITCHED

<..?

GRAY

MAIN RECTIFIER 0

S02

UN SWITCHED

TO MAIN AMP IN JACK

(L) (R)

-BB

...J

0..

::J

0..

<..?

BLACK

LP501

EARTH

GREEN

CB1

(R)

PL1

POINTER LAMP

PL9

RED

GREEN

BLACK

PWR

SWITCH

LAMP

-~-B~L~U~E._

______

SUB RECTIFIER

CIRCUIT

SIDE w

<..?

...J

t:::

<..?

CO-AAS

AM/FM

TUNER/

IF,

P.C.

BOARD

-----TO

CO-GG3

~---------...,_

_.G_.R,._E,.EN"'----

TO LP559

PURPLE

560

SWB

<..?

CB2

(L)

SPEAKER

PROTECTOR

-14-

FUNCTION SWITCH

'--,;,,;R.=.ED:;.,;i

► TO

CO-AA7

AM/FM

TUNER/IF,

P.C.

BOARD

GREEN

FU6

250V

SCHEMATIC DIAGRAM -MODEL

730

SYSTEM

INTERCONNECTION

.......

'-AM-4---------<"JLP201

PHON0(2)

PHON0(1)

AUX(2)

AUX(1)

TAPE

IN(1I

TAPE

IN(2)

TAPE OUT(1

PHON0(2)

PHONO(I)

SW1E

AUX(2)

AUX(1)

TAPE IN(1)

TAPE

IN(2)

TAPE

OUT(1)

TAPE OUT(2)

FRONT ENO

3.7

LP25t

C253

CO-HH4

C0-HH1

LP252

TC3

+B3

L201

270p

IC219

LP253

TCl

VCl

LP703

LP701

OUT

LP702

-B

LP704

OUT

SW1C

SW7B

CONTOUR

-15

LP511

LP508

LP504

LP509

-B

LP506

LP505

OUT

C0-A2

ME1

QUIETING

AM TUNING

CO-A3

LP512

OUT

!..P509

LP511

LP510

,OUT

LP509

-B

+B1

CQ-A6

-B1

STEREO

OUT

STEREO

QlJT

CO-A

CO-A7

CO-A5

CO-A1

CO-A12

LP511

LP503

LP6

C0-8

_co-sss

+B2

+B1

SVTEM 1

C0-01

CO-B

OUT

LP502

~LP7

LP509

-B2

_CO-BB4

-B

CO-B4

-B1 A438

LOW

CUT HI CUT 330

½W)

SW10B SW6B

i°J2

HEADPHONE

LP511

_co-cc5

3~~rY,W)

co-cs

LP509 +B2

CO-Cl

CO-C6

OUT

SYSTEM 2

100k

co-c

----:~2

CC4

-16-

SCHEMATIC

DIAGRAM -

MULTIVOLTAGE

MODEL

730

AM/FM

TUNER.IF, MPX

,,.,,0-----------------------------------------------------------1-----------,

CO-HH4

CO-HHl

..,

FRONT

END

"''"

EQUALIZER

AMP

0701,

0702

2SA872(E)

C702

22/lOV

R704

220

R702 R706

TOOk TOOk

C701

22/10V

R703

220

R701

TOOk

10/16V

0253

2SC460{CI

0703,

0704

0705,

0706

2SC1345(E) 2SC1345(E)

LP511

LPSOS

LP701

LP504

OUT

LP509

-B

+ LP506

LP704

LPSOS

OUT

17-

TONE/

PRE

AMP

100k

lcso2

!0,061

I I

' '

BALANCE

VOLUME

i i

I I

VR501 /

100k

R214

D252~0254:

1N60P

CO-A2

CO-AJ

OUT

METER

• OUT

0501·,0502

0503---

0508

2SA844(E) 2SC1345(E)

VR506

50k

LP512

OUT

I )

I I

I I R540

I I 220k

I I LP509

I I

SS '

TREBLE

I I

LP511

VR505 I

'50k

R517 I

6.Bk

LP510

OUT

~--------------->-----~LP509

R3S7

,oo

0304-.....0J14

2SC13351EJ

0501,

D502

0503,

D504

EOA01-20 SIB01-02

LP503-LP6

+B2

LP511

LP509

LPso2-LP7

D503

-82

LP511

LP509

POWER

CO-Bl

C402

100/l0V

CO-Cl

C401

IN 100/lOV

0301,

0302

2SC133S(EI

AMP

0401

..........

0406

2SC1400(UA)

0411,

0412

2SD415(R)

D401~0406:

1S2076

18 -

""'

LOW

PASS

FILTER

0407,0408

2SD549(0)

0413,0414

2S8549(R)

""'

----<"1-;.------+-lf--6co-Ae

STEREO

OUT

f-+----;-<)

~-o---!------1---+---f>co-A9

fl.CH

R32I

4.7k

0409,

0410

2SC853(L)

0415,

0416

2SD415(R)

~~83

0318

2SA83&(El

0417,

0418

2S8541{SorR)

C0-85

CO-B4

0419,

0420

2SD388{SorR}

co- 5

~REC

out

CO-A7

+83

CO-AID

CO-All

0-Aa

_____,.CO-BBS

+B1

CO-B6

OUT

_____.CO-B84

_____,..CO-CC5

+82

co-cs

OUT

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