Onkyo TX-7430 Service Manual

SER

IAL

TX·7430

NO. 32 58

-

ONKYO

,

~

,

SERVICE MANUAL

aUARTZ

SYNTHESIZED

TUNER AMPLIFIER

MODEL TX-7430

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFI ED BY MARK

AM

SCHEMATIC DIAGR CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.

REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PARTS NUMBERS APPEAR AS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURR ENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS

ARE ACCEPTABLY INSULATED FROM TH E SUPPLY

CIRCUIT BEFORE RETURNING THE APPLIANCE TO TH E CUSTOMER.

AND IN THE PARTS LIST ARE

L.

ON THE

TABLE OF CONTENTS

Specification s 2 Service procedures 3

Exploded view _. . . . . . . . . . . . . . 4

Parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Circuit descriptions 6 Block diagram - Amp. section

- Tuner section Block diagram Packing view

Adjustment procedures __ .

Pc bca rd view/parts list

Power amp. . . . . . . . . . . . . . . . . . . . . . . . . .

FM

/AM tun er 25

Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Preamp. . _. . . . . . . . . 30

Remot e cuntrol . . . . . . . . . . . . . . . . . . . . . . . . 31

Switch

Spea ke r 32

Volume 32

Schematic diagram

Amp. section " 23

Tuner section 27

Disassembling prccedu res 33

of

IC 14

..

. . . . . . . . . . . . . . . . . . . . . . . .

- . . . . . . . . . . . . . . . 12

.,

. . . . . . . . . .

..

.. ..

..

13

17 18

21

3 1

ON

AUDIO

KYO

COMPONfNTS

®

- 1-

SPECIFICATIONS

AMPLlr-IER Power

Musi c ~1

Continuous

Total

ll arm o ni c Dis tor tio n:

IM

Distort

D~rllping

FroClu8 RIAA

Ouvia tio n:

Se

ns iti vit v

Pho

no

Signal-lo-Noisu

Tone

COIlIIOls:

MUl

ing:

Output

Power

ioll

:

Factor:

11

CY

Responso:

aud

Ovet lo ad :

SECTION

:

Output

:

Outp

lmp

cd a n co :

Ratio:

45 channels than 2

x

2 x 78 2 x 70

ut:

2 x 55

0.08% at rated

0.08% at 1 0

.08

0.08 % at 1 35 at 8 20 - 30 20 Phono CD/Tape Tape Rec: 120mV Phono: 85dB

CD/Tape:

Bass: ± Treble:

-20dB

watts

per

driven

0.08% TH D.

126

watts

watts watts watts

watt

% at

rate

watt

ohms

.000

20.000 :

Play:

150mV/3

RMS

channel,

. from

at 4

ohrns.

at 8 ohms, at 4

ohms,

at 8

ohrns,

power

outpur

d

power

ouput

Hz ± 1

dB

Hz ± 0

.8dB

2.5mV/50 150mV/50

.5

at 'l kHz,

(at

10rnV

75dB 95dB 80dB

±10dBatl0kHz

min. 20Hz

1kHz 1kHz 1kHz 1kHz

kohms

0.08%

input

10dB

RMS.

to

20kHz.

(DIN) (DIN) (DIN) (DIN)

kohms

(phono)

THD

, A

(IHF

A-202)

(A

weighted)

(IHF

at

100Hz

at 8 ohrns,

w ith no

weighted)

A-202)

both

more

TUNER FM Tuning Usabio

50cJO

Captut e Ralio: Imago Hei Ir: Rojocli Signal

Selecti vity

AM

ll arruo

Fro

St oreo Separ arion:

AM:

Tuning

Usable

Image Rejo

IF Rejeclion

Signal Harm onie

GENERAL

Dimensions

SECTION

:

Rango :

Sunsiti

Ouio rinp

ectiou

oll

-lo

-Noiso Rati o:

Suppression

nic

DIslortion

quuncv

Rosp

Rango :

Sensitivitv:

clion

-Io-Noise Otstoulou:

vitv:

Snnsitivitv

R~lio:

onso

Ralio

(W

Weight:

Ratio:

:

Hario:

:

Ratio :

x H x

87 .5 - 108 Mono

Stereo: 18

:

Mono: Stereo: 1

.5dB 85dB 90dB Mono Stereo: 50dB 50dB Mono Stereo: 0.30%

30 45dB 30dB

522

30~V

<lOdB 40dB 40dB

0.7%

D):

.0MHz

:

DIN

(±300kHz. 40kHz

:

15.000Hz ± 1.5dB at 1kHz at

100

- 10

- 1611 kHz

435

x 11 0 x

17

-1/S"x <1

7.5 kg .. 16 .5 Ibs.

(50kHz

12.8dBf. 1 75

23~V(S/N

75 18

37.2dBf

72dB 66dB

0.15

.000Hz

(9kHz

-3/S

.0\lV

ohms

.0dBf.

ohms

.0dBt.

%

steps)

3<15

steps)

(S/N

.

m[n

"x

13-1/r

1.2~V.

26d

DIN

2

.2~V.

46dB.

DIN

2.2~V.

20~V.

dev.)

75

ohms

B.

40kH z Devi

75

ohms

40kHz

75

ohms

75

ohms

.)

Devi .)

Spec

llicatiorts arid Ieatures are

subject

to

chanqe

without

-2-

notice.

TX·7430

Remote

Tr

ansmiu

ign

S

Power

Dim ensrions (W x H x

Control

er:

nl range:

supply:

transmitter

0)

:

RC

-82S

Inlrar

ed

Appr

o x. 5

Two

"AA"

64 x 18 x

meters

baueries

149 2-1/2" x 11/16" x 5-7/8 110

Weight

:

grams 3.9 oz.

SERVICE PROCEDURES

1. R

eplacing

f or co nt

0111\' w ith saure tvp e

Circu it no. f9

02

f903

, P9 04

P905

2 .

Change

This mo de l is not loca red Ihe band sclcc to r sw ilch.

If th e PM b died es If th e AM

(lS

S133)

3.

Memory

Th

is un it A hu ilt-in me 01 th e m unit

is unplugged. The unit power sw itch t ba ck

-up mem ory ,the pow times

each mont

The per

prese rved

d

cpen

din g on On the peri od of 3 10 4 the last tim e pow shor l

er

used

in an a rca

the

fuses

inucd

prrn

cc tion ;);:;Ullst lir c ha za rd.re plnce

and

s.uuc

rat

ing (use.

Part

no. Des

25207

5 252078 252070

of

FM/AM

and

(lSS133)to07

step is eha nged from

band

stcp is chungcd from

10

0711

preservati

does 1I0t req uir e m

mory power

emory

system. No te rhnt since t h is is not a

iod of ti me

after

climate and

average,

whe n

the

band

09 and

on

the displuy PC board.

on

durin

g p

urn

ed Oll and

er

switch rnust be

h 10

keep

dur

ing

pow

er

has

mem ory conten ts are p ro tec ted

wee

ks (a mi

er

ha s been

un it is ex

with

an ex tremely

cripti

2.5A-SE 5A-SE-EAK, lA-SE-EAK

step.

50k

0710

on the display PC boar d.

9kH

emor

y pr

bac

k- up sy stem prese

ower lailur

rnust

he pl

oll

on ce in o rde r to

the ba ck

whic

h mem ory co

la st

been

placement

nimu

m of 2

turncd

pos

cd to ve ry high

on

-EAK, Pri

Hz 10 200k Hz, rcm ovc rwo

z to 1

eserva

es

and

turn

-u

p systern o pe ra

turned off va r ies

of th e

off. T his pe

humid

mary

Sec

ondary

, Scc

ondary

0kHz,

tion baucries .

eve

ugge

d in

ed

00

nte

unit.

wee

clima te.

rves

n when t he

and

perma

and o ff a few

nts ar e

over

ks) af ter

hum

mm

rernov

char

riod

idit y o r

(1

6ft.

(l

.5V x 2 )

(in

clutl

e

01

co n ten ts

the

ge th e

nent

tive

.

a

is

4")

"

ing

diodc

uaueri

es)

o I I 0 o ,

o

Pli

.

0 11 0

0'

o vc r

TX·1430

o

0 '

Q

;:

W

-

>

C

W

C

o

--I

a.

><

w

-4-

PARTS LIST

REF.NO Al A2

A3

A4

A5 A6 A8 A9 A

I0

A l l

A12 A13 AI4 27 14 1123A A15 A2 1 27

A22

A23 27 A3 1 28 18

A51 l AOO1121

A52 A61 27 175 13 0 A71 2832

A72 28

A73

A74 28

A75

A76

A77

BI 834

B2 B3 838 4 B4 B5 B6 B7 88 B9

BIO

.

PART NO. 27100

121 A

27

1209

43 A 27 130470 27 13046 8A 27

16020

1

27130

469

27

190

359 27273030C 28 133

176A 2

8130242A

27

300750

27141122

272702

16

110338 27110339 27

190525 27

190526 190

105

4356A

28

184357A

lA

OI0 12 1

28140

220

2796

283 227 95 A

322469 28322304 -1 28322

470

2832230

283 28322928 28322929 2832292 28322925 28322926A 28322927

83 1

834 82 1 8304 82 1 833430080 8800 830

322

92 2B

22923B

430068 1300

4008 4301 4300

40089 4200

11 440109

5-1

4

88

08 6

4

A A

8 8

A

9

DESCRIPTION Chassis Back p anel Bracket , shie lded Bracket , rad iat or Radiat or Bracke

t, power tr ansforrner Holder, dial plat e Join t L Back

platc

Dial plate

~

Strainrclicf

Bracket

F Brack et R Spacer Fro nt bracket ass 'y < S> Front br acket ass'y H

older,

slide r < S> Hold er, slider H

old

er, ante nna

Top cove r <

Top cover

Fr

ont

Fro nt panel ass'y

pane

S>

l ass'y <

S>

Cushion

Leg Knob,

Power < S> Kno b, Power Knob,

Speaker A < Knob

, Speakcr A <8'> Kriob , Spcaker B <5> Knoh, Speaker II Knob, Volun•• Knob. Volume Knob, Ton e < S> Kno b, T on e Knob, Slide <5> Knob, Slide Knob , Push <S> Knob , Push

3T rS+6 B(BC), 3Tn \'+8f\, Tapping scrcw 4TTB"'SC(BC), Tap ping screw 31TS+I0B 3P+6 FN(B C) , Pan hcad screw 4TTC+8C(B C) , 2P+4F(B C) , Pan 3TTP+

8P(BC), Rivet 4TT

C+I 0C(BC),

5>

$'

Tappi

ng scrcw

(B(' ), Tapplug screw

Tapp

ing screw

hcad

Tapping

Tapping screw

screw

PART

REF .NO.

Bll

F90 2 F90 3, 1"904 1"

905,

F906 P304 P901

Q508

, Q608

Q509,

Q609

Q902, Q905

T901 UI

NO.

870060 252074 252078 252070 250600

44 253 128B or 2531

30A 220 178 3, 2201 784 or 2

201786

220

1773,

220

1774 or

220

1776 2201 754, 220

1755 22014040 220 2300

I A0085 69 ·2A

,

r

1405

199

U2 I A00 8570·2A

IA

0085

71·

U3

U4

U5 1A01 3573-1

U6

U7

UR I A01 3576·1A

U9 I AO

UI0

Ull

NOTE :

I AO

l

A013574

lA0

I A008578·2

1A00 85 79-2

:

Only Black mo del

<

S>:

Only Silver mo de l

2A

I3572

·1

08575-2A

I3577

·1 A

DESCRIPTION

Flat washer

~

2A-SE- EAK, Fuse, prirnary

~

5A-SE-EAK , Fuse, secondary

~

1A-SE-EAK, Fuse , secon Termin

al GND

~

AS-CEE, Power

2SC3854(0), 2SC3854(Y) 2SC3854(P) 2SAI490(0), 2SA

I490(Y

2S AI4

90( 2SD I9 13( R) , 2SDI9

13(S),

2SDI

406(Y)

2S DI

406(G

.6.

NPT-955G, Power tran sform er NAAR-2869-2 A, FM/AM pc b

oard NADlS-2870-2A b

oard

ass'y

NAAF-2871-2A,

board

ass'y

NAAF-2872-1, Volum

ass'y

NAETC-2873-1 , V pc board ass'y NAD IS-287 4-1, Vol pc

boa

rd ass' y NAPS-2 and

power supp NASW-2876-1A, pc

boar

d ass'y

NAETC-2877 -1A,

pc bo ar d ass' y

NA

ETC-2878-2, terminal pc NAAF-2879-2,

or

) or

P)

R)

ass'y

875

-2A, Power

board

supply

or

, Display pc

Prearnplif'ier pc

olum

ume indicato

ly pc

boar

Speake

Speaker

Remote co ntro l

ass' y

Switch

ass'y

NO TE: THE

CO MPON CR IT ICA L F S

HOCK. REPLACE

SPECIFIED .

dary

cor d

tune

r

e pc boa rd

e rno to r

amplifi

er

d ass'y

r switc h

term ina l

pc

boa

rd

OR

r

ENTS

IDENTIF

RI SK O F FI R E AN D

ON LY W IT H P

IE D BY

MARK~

ELE

ART

AR

CTI C

NU MBE RS

E

CIRCUIT DESCRIPTIONS

1:

Remote

control

decoder

(LM6405G)

• 12V

Ta

INDIC fl TOR

r

---.-L!J

tun nr {

Ta v

ca n

VCR - 2 VCR - ,

c.p

P H

T- I

T - 2

Ta Sw

~

alu

tra

itc

f----

me [

l lC

mut

e [

h

..

x.i o t PCo

pc

,

PC]

IN

T

~ E S

PO o po, p o> p o ,

PEo

(PLA

O )

I (P

LA'

PE PE > (P LA 2 ) P E , ( PL fI , )

P F> ( PL fI Ph (PLfl7)

TEST

Vss

o---E

)

.)

LM 64

05G

E X

V

oo(

PB' PB PB I

P Oo

P

A'

PA> PA '

PAO P

I2

Pl

PI O

PH, PH, PHI

PG , PG2 P

G,

PG o

.la

2 -

I

l

'5V)

- - f-- -

-I

,----- -

--I

'------j

-

~---

f---

-

~---

-~

---

-

-t-

- - - ..

-

-t---r-

..

-+-- - -

-

~---

- - -

-PHo

-I

;>0

-j

)

0--

-j

;,.0---

M

..

SP CTL

..

BACK UP

I N I T STAND

POWER CTL

PROTEC

-+---

t

- - -

- -

Ta casset te

- Ta CD t erm inal

AIN

OFF

BV

T

RE MOTE S

T- 2 ON IOFF

t

erminal

ENSOR

!'ill No . Code

-- - - - - -

I

2

3 5

5 7

8

9

10

X't al Ccr.unic rcso ua to r

ST.

ur

1'.

D N

(NDI

RE

VO L.

VOL.

MUTIN

S

U!'

DN

--

G

----

Pr

oset

STATION

"L"durin

O ut put l'r

esct S

TATION DOWN

Output"L"

T

erminal

Re

V

OLUME

Outputs

V

OLUM

OUlpUI " LU

MUTI

Switching of

Ior

set

termin

"L"

E D OWN signal ou tp ur t

NG O N/OFF

---

U!'

sigIlai o u tp ut

g pu

shin

g of rc mo tc co n tro l ST AT ION LiI'

sig na l

durin

g pu

shillg

o f rc indic ntiug Ligh t recci v

al

U!'

signa l o u tpur tc

during

push

ing o f

durin

g pu

shing

o f

VOI.UMEDOWN

o Ul

pull

erlllinal

" L"

++"

H"

(ON

= "

ter

min

outpur termin

mote

co u tro l ST ATIO

ed

by rcmotccout

rmiu

al

VOLLiME

erm

inal

H")

by nieans o f

-6-

Descrlpti on

al

ur

KEY

KE Y

renr

KEY

N D O WN K

rol ;

during

ote

co n tro l A

EY

liglu

rec

cption,"L" is

UDI

O M

UTIN

G K

output

EY

TX-7430

No .

11

12

13

14

15

16

17

18

21 G ND 22

23 T -

Code

MUT-2

VCR-2

V

CR

C D

PH

T U

1'

-1

1'-2

REMIN

2CTL

-1

Muting loTAPE-2

Selector

"L"

during

Select

or

during

" L"

Select

or

"

L"

during

Select

or

"L"

during

Selector "L"

during

Selcctor

during

" L"

Select

or

Swit

ching of

GND

terminal

R

cmote

TAPE-

20N/OFF

1'-2

outpur

signal

out

put

signa l output te

200mS

aftcr

signal ou tput

200mS

afr

CD

changc-over

200 mS aft

PHONO

sign al outpu t t

signa l outpu t t

signal ou tpu l

change-over

200mS

after pushing

200mS

aftcr pushing

200mS

after pushing remote

" J-I"+-> " L" by

control

is

signa l

chang

control

ed-ov

terminal

er pushing remote

cr

terminal

for T A

rminul for

pu

shing

signa l

pu

shing remote control

erminal

input

cr

VCR-

rcmote

for

VCR

outpur

sign al

remote

for

TUNER

renr

ote

forTA PE

for TAI'E-1 cha nge-ovc r

mcans

o f rem ote co ntro!

terminal

wiih "L"

input

Descrlprion

PE-2

cha nge-o ve r ''\-'1''

2 cha nge-ove r

contr

ol

VCR-2

-I change- ov cr control

VCR

terminal

out

C D

put

terminal

co utrol

PHONO

cha nge -o vc r

control

TUN

-I change- o vc r

cont

rol

TAPE-I

during

KEY

-1

KEY

ER

KEY

TA PE-2 KE Y

200mS

chang

e-over

tim e

24 25 CO 26

27

28

29

30 SP

31 M .

33

35

36

37

38

39

PRO

POWER

STBY

C D

PAUSE

TECr

NT

INIT

UP

B .

CTL

OFF

MO

REW

Fr

REC

STOI'

Pror Power

IN

Power Switching

T

Output terminal " L" c1ur

O utpu t

Speaker control

Main pow

D E

S

Cassette deck "H"

-

C " H"

Casse tte d e ck c " H"

Cassc tte "H"

Ca

"/-I"

eeti on

so urce so urce

erminal for

ing

terminal for

erial

signal

during

asse

ue deck

tluring

durin

deck contr

ehrring pu

ssett

e d

timing 200mS

function

of

300mS

er

outpur termin

200m

200mS

g 200mS afte r pu

eck

condiiion

control

"H"

+->

incli

cati

for

out pur

sour

cc

controi

S aft

control

ontrol

shing control

input

outpur

"L"

on

during

stnrt

wh cn pow

back

terminal ("L

OFF

signal

er pushing

signa l outpu l te rmina l

after

pu

signnl o utpur

ol

signal

of

rcin

signal o utpur t

after pushing

terminal;

(ON = "H

of selector

up

det

al f

shing

shing rem

or c co ntro l ST O P K

with

"

terminal ; conn

terminal

")

STANDI3Y; POWER

er

so urcc is

during STANDI3Y

cction termina

or

CD

ou tpur t

rernor e

rern orc

o utput

rem

ON

" = spea ke r o utput O N)

co ntro l usc

erminal

conrr

cont

terminal

ore

cont

terrninnl

erminal

ote

cout

J-I

"

input , out

ccts to

I

ol

rol

REW

rr

REC

EY

PAUS

put

POWER

rever

KEY

K

EY

KEY

E K

SI'

CTL

" H"

output ; POWER

sing

outp u r

EY

ON

with " H"

--

40

41

42

PLAY

Von

Extal

Cass

ette c1eck

1-1 " during 200m

"

P

ower

so

urce

Ccr

ami

c re

sonator connccti

contr

ol signal ou tpur t

S a fter pu sh ing renr ot e

terminal

on

terminal

ermin

al

cont roll'LA Y KEY

TX-7430

2.

Controller

connectio n

-;

--"

z r

c

~ c

rn

()O

rn

!>JJ

-:i m

O (J)

JJ()

rn

z

-;

0

f

I g ib

el

le

--

d

(J) _ (J)

<0

0

;:: -"

(J)

::E3:

0

__

(Jl

~ CD

GlI-I-1

o ~ -

(J)

0 1- 1- 1

N - -

~ CD

;>;

;:: ;::

OII

m

O)N

N

~(f)

(J) (J) o c>-

0<0

JJ

-<

-.

KE

Y/O

MATRIX

/OOE

-

rn

L......-

C

-q

-"

m

.o

l

MUT E

4 2

AUTO/MA NUAL

4 1

UP

4 0

DO

30 29

27

25

22

WN INT A

B

C

0

FM MW

LW

SHIFT

~

P S C I

AM I

FM

.

CE

EOI

E

02

SO

3 9

38 37 36 35 34

3 3 32 3 1

28

2 6

24 2 3

Irorn

re

mot

e con trol

070

5

BCD TO DECIMAL

ECODE

D

~

R

0 1

12

, 0 1 11

AM +B SW

AM + B

AM

10

Q7 01 PULSE FM

1

1--

SWALLOW

PRESCALER

10

I

LOCAL

~

I

01

0 4,

0105

L.P. F.

07

I

GATE CIRCUIT

I

0 3

I

.

VT

NOIS E IF L EVE L

OSC

t

2 3

4

5 6

8

9 10 I I 12

13 14

/5

/6 17 18

19

20 2 1

\J

I

7

CGP

\..T

Sg

SI Se

Sd

Se

Sb

So

K3 K2 KI KO

-

0

--J

0

.l>

-

06 05

04 03

02 0 1

XO

5

X I

T

Voo

!

~

I' in No .

I

2 - 8 S;l - SI'

lJ - 12 -KO - K J

D-

IlJ, 20

2 1

I S

Sym bo l

(

'(J

-

IJI

X 2

X I .

V

DO

P

1)6

Te

Segme nt

retu rn sig ll<!l

K ey

in pui s

ou

D igit

X 'l al

Po w

er

rmi

nal

O u tp ut t

- - -

- - - -

Oll

I put s

tpu

ls D isplay tu bc digil

sot I rce

inpu

Displ

ay t ube

ac ti vc hi gh. Sincc Ih esc

to th e seg

Te

rmiuat

rc tur n signal so urcc

Conu

ec t

Dev

t

ice

[ro ru the super capaci tor C7 14 Ior memo ry preservat ion.

..

erm

inal

Io r sound

te

s i g n ~

meut

s ro r in p ut o f t hc

10 t he 4

pow c r so 1I rce

rmina

1

terminuls

out pul signal

to di odc

.5M

H z

tc rmi nal ; sli ppl ie5

- 8-

Dcscri

'

'I'E

E'' .

l ou tp u r

ermi

nal-, can h,lIl d le JO

t

of

ih e tl u

or

ret u rn sigllals

key

te n u iua is:

matri

x.

cry

sral osci l

p tion

rc

ruru

an d kc y

escen t di spla y

nc ti ve lo w. 0 1 is uscd th e key

lutor.

5V

dnr

signa l source te

V,

th e y are co nncc rcd d

tub

e.

lr

om extc ru al

il lg no rma l operanon and

maui

rmi

nals:

x circuit.

irec

2.5 V

t ly

TX-7430

Pin No .

22

Symb

SO

ol

Te rmina l

Sta tion det e

signal input

Err

2:\, 24 EOI, E02

25 CE Chip

26

27

FM FM local ose illato r

AM

or o u rp u rs

enab

slgnal

input

A M loeal osc illa ro r

signa l

inp

2R PSC Pu lse swallow

com ro l ou tpu t

etor

Input termi nal for de tee ting reeeiv ed d uri ng uu

Char

ge pum p ou tp ur of thc phas e detecror with

level is o utpu t whc n

io-

tu ning.

t he dividcd oscillation frcqu c ucy is highcr rhan

refc ren cc frcqu cn cy. In th e op pos iie case , low le vel is output. Floa ting occ urcs whcn thc frcq ucucies match . T he o

tor

ca paci T he

diode in rhe fro nt

ou lpu t fro m bot h tcrm iuals is sa me , but o nly E0 2 is usc tl.

le Deviee selcction signal inp ut t

l. ow le vel ... Mem ory pre sc rv.u ion

Input termin al

[or FM loeal osc ill.uor

Q7()1.

Termin

ut

al

for inp ut o f ihe

Thi s t

ermin

al

outpu

Q70 1

to 1/10 o r 1/17 whe n rhc pu lse swa llow meihod is used [or d ivision.

A M local oscill.uor signal.

ts a signal t luu swirchcs t he pre sc.iler division r.uio of

(FM only)

Dc scripiion

whethcr

Stopped

or not a brondcast signal is bcing

by t he high level.

utp

end

thr

ou gh rhc low pass filler Q

ermin

al .

High lcvcl

is divided by I/l o o r

--- ---

cons

i i ru res th e PL L. High

ih

c

ur is npp licd 10 the varia ble

I04

a nd Q

I05

... No rma l op era no n

1/17 by prcscalcr

.

29

30 S

31

32

33

34 35

30

37

3R INT

39

,.j()

4 \

-

42

G NO

HIFT

LW

MW

r-M

A

B

C

0

MEMO

ME M

RY Merno ry down

OR

UP

AUTO

I

MANUAL

MUTE

Grou

nd

Pre set rcve rsc indieatio n ou tp ur

Ba nd switching

signal o urputs

Prese t sra rion

indica rion OUlpU

inpu t

Mem ory up

Y

inpu

t

A u

to/Ma

indi

cation

Mur ing o ut

nu al

outp

pu l

Te rmina l fo r ind ienn on ou tp ul whei her

MI - M8: Low lcvcl M9 - M 10: High

Terminal

terminal of FM (pi n (pin no . 3 1

Te

IS

A

n

C

0

Not

Terminal

s for signal o utpul switehing of cach band . High level is outp ul frorn

11

0.

& 32) duriug r M rece prio n

rmi na ls for

MI M2

I

()

() () () ()

uscd.

ßCO

code o utpur of pre sc t stutio n indic.

M3 M4 M5 MIl M7 MS

()

I

() ()

for

down signal

Acriv e low.

T

ermin

al for

up signa l inpu t

Ac iive low.

-

Te

rmina l Ior irul ica tion

T his t

erm

ur

O utput t

inal becom es hig h dm ing ,1

ermin

al which released; nctivc high . T in: muti ug signal is outpur as show n below . UP/OOWN

ancl

preset

of manu ul/au to moc le , presel Illelllory is reeall ed , b.uid swirching

scan.

---

MI - MS o r

-

M9 - MI Il the prese t key.

level

33) .md low lcve l is out put lro rn o rher t e rm inals

..

-

uor.

()

I 0 I

()

0 I I 0

I I I

I

() ()

()

inp ut o f p re set

()

mc m

()

I

ory.

of pre sc t mem ory.

output

mute

whe t her or auto i he tuni ng mod e.

11

10 morle a nd low (hlring munu nl mo de ,

s rhe shoc k noisc oeeurrin g whcn rhe PLL is

TX·7

430

Control key and diode matrix connections

K3('1) K2(

' -

Sg(2)

Sr(3)

S

e(4)

S

d(5)

Sc(6)

Sb(

7) HI -l l L

Sa( H)

--

M4 /M 14 M3 / MH

/MI

H

S I-

f1n

A U

TO

MAN

UAL

l'NIJ

'l0/'ik

Hz ' LW2 ' L W I

[) I (I H) ' I3A N I) 0

Dio

de

111"1

z .

rix

DANDI

.. ..

....

•

n A N DII, lO

/lIkH

3. Muting circuit

01 03

FM IF &

AM rad io

svstam

111)

MIJ

7/M17

M

-

I'IU

,SET

SC

A N

_ .

LW M W

M

EM

I) IS I'

OI ~ Y

I.A

Y

M2/M 12 MI MU

MIIJIM20

---

I)

OWN

I'R O GI ~ A

--

' I

' IJA N D I

"M

I" I/\(I oc llillgs . Se e tnble 2 .

AM

I

,,"

\(I oe ll illgs . See tub le 3.

8

11tH

lro m

0 106

KI

M I(,

mUl

(II)

--

-

in9 Ou

..

M

- -

IPU!

5/M1

M

----

M3/M

_-

" M

UI'

W I N A R

---

'A

-----

ST

DY

0 ' c o o

,-

- -

KII( 12)

/MII

5

IY

-.

DEI

IW M AT

IC/

N A

rnblc I

trou

--

-,

W

-

er rc

070

from

llA

N DIl BA N D I

-- - _ .

D7 J0

0: Open I : Conue ct

A M

lJ

0

--

I

11

: O pen I: Councct the diode ( 1

2 ri1\ '12

TKC

020

4

1)70 '1

0

1 I Europe 87 .50-

IOkH ,J9

kH

z

D711

0

1

11

Lch

FI~E

I

~E GI O N

U S .A . R7.'1- 107.'1M Hz 200k H,.

the

diocle (I S

FI~ E Q

UE N C Y I

530- 1620 kH z 10kH z 522 53 1- I

.-

QUEN C Y

AN

G E S

H

-

I08

.00 M H z

SI3

3) . tnhle 2

~A N GE

- 16 1l k

Hz

W2k

Hz

.'1.'1

133).

C I IA NN E L

I'A

CE

50k

Hz.

CII ANN EL SI'AC E

9k

Hz

'1k Hz

iable 3

The rnuting

1.Wb ile pi1l 4 2 of co ut roll er IC ou t pu ls thc high lcvc l.

Q207

the foll ow ing "cascs is recalled. and using

2.

When muti

Thc IF levcl in th c I:M

cir

cuit

ope rat es in the fo llo

and

being

held

aut

o search

Q208 ar e

down.

(3)

Whil

tumed

.f

Ü

While

(2)When

e a

tuning

on and

radi

.

an FM st a tion is not being rec

ng s

witch

is on) .

110

systcru (

wing

case s ,

muting

is

clo

the ma nu al UP/DOWN

a st at ion in th e m

o sta t ion is be ing rec e ived

eive

d (a nd

sct

a t

IUOI

SO

llllll

sed in

emory

the

ili g

0 20 1

S

tereo

swi t ch

is

011 2

0 7 15

16

dec

oder

is 0 I'C llC U a t 17 .Zd Br

po int 55 k Hz a

t p iu R th rough the A ND circuit. Wheu a sla t ion is tur ued ,

tlie o

utp

ut goe s to lhe 10

"'h

en o utput gocs 10 t he 1

Q I 16 is tu rn ed

so

rnut

ing is decod er Q201 g osc illa tor st

Reh

R7 5 3

and

(100kHz

art

step) :

Oll

and

Q207

operred.

At

oes

to th e low level . so

s ,

zer o -c

30kHz.

11'

levcl .

011'

level,

nn d Q2 08are

the

M

ONO

ross

d ct c

ctiouc

(5 0 kHz. st cp ) -ar c o utp ut

Q1l

5 t ur ncd of'I,

sarne

, pin 16 of

tunr

the

irc

uit

ed o ff,

ster

VCO

(Iuning

eo

-1

0-

4.

PLL

tuned

A

block

the

Operation

The div ider is applied with

10kHz

difference

is a filter to the the

Operation

The

unit

diagram

above

diagram.

reception

wnere

to

frequency reference

for

in Ireq uency is

pulse

waveforrn

t o

change

the

variable

reception

sarne

and

pulse

. In th is t

circuit

of

the

tuned

during

AM

phase

. it is

it

into

capacitor

.

w

metho

of

pre

reception

c

ornpar

oe

y .

This continues

reception

scaler

frequency

it is divi ded to lIN

the

D rnodel l . If fr

frequenc

Eo·O

du r in g FM

s

wallo

ype

of

the

is

applied

fr (9k H z for G

and

output.Since

passed t hr

volt

diode

d is

aror

fv di

age

in

used

to

and

where it is

Vd ,

the

in

. a supplernent

PLL

the

ffer

ough

front

the

26 I

outpur

/W

. Eo

err

which

unt

r-

sc

is

shown

in

pro gr

arnmable

as fv .

This

cornparated

model

s a nd

equal

to

or outpur Eo

the

low

pass

is

applied

en d to

and

scaler

ary

change

fr

of

number

il fv

pr e

the

are

thi

TX·7430

(chan

ged

acc

ordirng

divided

combined

divi si

to

and 1

The stat

m

frequency limit

pr

divi

The

divided

frequ

s

is operation

recept ion

in

the contro! counter

on

Iac

ex

able

escaler i which

outpur

ror is s

tern

al con tro l

/17

when it is " L ").

ion osc illat or

div

ider .but

sion

to

1/Np;

sign a l is

t o l

/N

ency re fere nce in

as Eo

.

to

frequency

wit

ch ed

(I/!6

the prograrnm

of

only

can

be

applied

. T he

until

the

program

from

1/16

or

whe n th e PSC t

frequenc

to

result

a

30MHz.

used

the progr

the

phase

rnatch

y is

up to

is compared

is obta ined as in AM

the

an d

1/!7

app

abl

e d

so

the

ISOMHz.is

ammab

derector

code

input)

presca

ler

the

presca

acco rding

ermin

al is "H "

lied

to

ivider

pulse

le

divider

with a

and

the

are

ler' s

the

program

has

an

upper

swallow-type

insert

ed for

and

25kHz

e

rro

r

-

5.

Auto

Q103

FM

IF&AM

SY

STEM

Q113

N

OI

SE

DETECTOR

search

12

tuning

8

TO STEREO DE

CODER

D10 7

1""1

circuit

07

03

P

+B

2

TONED INDICATOR

2N

OCC

r-- f--

06

During

FM

ti on a nd

IF & AM systern IC o f Q

circuit of Q113 .

0

cc

w

-.J

ou t pu ts go t o th e l

caus ing p in

u

(0

co mp lete 3U to sea rch t

During

AM

tion

included

station

is

JC

to go to th e high level to co mplete aut o search tu ni ng.

recept

zero cr

tumed

ion .this

oss

Whe n a sta tion is tuned , the o utp u r o f a ll

ow

22

of

the

recepti

in th e FM

. Q

703

is opera ted b y

detecti

on ci rc u its incl ud ed in

I03

and by th e

level so Q

con

on.

703

tro lle r IC t o go to the high leve l

unin

g.

this

is

IF

& AM

go es to

off,

no

goes from o n to off,

operared

system

JC o f Q

causin

g pin 22 of th e co

the

IF

leve

the

I03.

IF

the

level

When

isc co mponent d

by

l

dere

FM

ete

a

ntr

c-

ct io n

derec-

oll er

-11-

Onkyo TX-7430 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual