Kenwood Kr-a4020 User manual

KR-A4020

iobsiebahc

SERVICE

MANUAL

PRINTED

IN

JAPAN

B51-4138-00

(S)

3223

Front

glass

Metallic

cabinet

Knob

(VOLUME

CONTROL)

2

‘(A01-

4

= 7

(B10-1076-03)

Panel*

{A01-1832-01)

Knob

(TUNING)

{K29-3597-04)

(K29-3893-04)

Knob

(SPEAKER)

Knob

(K27-2006-04)

Knob

(BASS,

TREBLE,

BALANCE)

ees

(K29-3892-03)

(K29-3894-04)

x3

Binding

post

Phono

jack

(2P)

Lock

terminal

board

(8P)

AC

outlet?

AC

power

cord*

(NO8-0128-35)

(E13-0235-05)

(E20-0823-05)

(E03-)

{E03-)

Slide

switch

Lock

terminal

board"

Phono

jack

(8P)

Slide

switch

ealsetsi

te)

Power

cord

bushing

(E20-)

(E13-0820-05)

(S31-2136-05)

(J42-0083-05)

*

Refer

to

parts

list

on

page

28.

KR-A4020

CONTENTS

CONTROLS

AND

INDICATORS

........-.-..--+-+5:

SYSTEM

CONNECTIONS

...........-----

22-2

eee

ee

DISASSEMBLY

FOR

REPAIR...........------+++-+>

BLOCK

LEVEL

DIAGRAM

............----

522s

eee

CIRCUIT

DESCRIPTION

............6.2.

eee

e

ee

eee

ADJUSTMENT

........0.

000:

e

eee

eres

2

WIRING

DIAGRAM.....

4

PC

BOARD

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

5

SCHEMATIC

DIAGRAM

7

EXPLODED

VIEW......

8

PARTS

LIST

...........

13

SPECIFICATIONS

......

ee

ae

a

ee

~.

t

1

H

Display

section

H

i

PHONES

jack

ee

POWER

switch

MEMORY

key

Numeric

(1~

10/0)

keys

P.SCAN

key

VOLUME

CONTROL

knob

SPEAKERS

A

and

B

BASS

&

TREBLE

switches

control

knobs

Input

selector

keys

VULUME

CONTSOR

BALANCE

control

knob

DIRECT

key

TUNING

key

LOUDNESS

switch

AUTO

key

:

KR-A4020

CONTROLS

AND

INDICATORS

Display

section

STEREO

indicator

AUTO

indicator

TUNED

indicator

TAPE

indicator

MEMO.

indicator

|

AUTO

STEREO

TUNED

MEMO.

TAPE

TA

Wi

Ti AP

UD

ke

Hil,

LM

|

Ll

MHz

Frequency

display

Input

selector

display

Preset

channel!

display

KR-A4020

-

SYSTEM

CONNECTIONS

Make

connections

as

shown

in

the

diagram

below.

When

connecting

the

components,

refer

also

to

the

instruction

manuals

of

the

a

Do

not

plug

in

the

power

lead

until

all

connections

are

complete.

Speaker

system

A

AC

outlets

for

U.S.A.

and

Canada

etc.

for

Austraka

for

Europe

and

U.K.

antenna

7]

a

wa

O

(peallvaa

FM

DE-EMPHASIS/

ca

CHANNEL

SPACE

switch

hy

<o

{Except

for

some

areas.)

metyehishe

selector

switch

{Except

for

some

areas.}

L»

UL

To

AC

outlet

CAUTION

n

ATTENTION

=

OPO

A

Hee

IH

anes

tate

She

tone

Turntable

(Turntable

using

MM

cartridge)

AUDIO

OUT

LINE

OUT

LINE

IN

CD

player

Tape

deck

VTR

(VCR)

Right

Left

Speaker

system

B

Notes;

———___—___________-_—_—_—

—_

1.

To

prevent

possible

problems,

always

disconnect

the

power

plug

or

turn

off

the

POWER

switch

of

the

receiver

before

connect-

ing

or

disconnecting

the

audio

cables.

2.

When

connecting

audio

cables,

always

insert

the

plugs

s@-

curely

into

the

connecting

jacks.

@

Insufficient

insertion

may

result

in

no-sound problems

or

gener-

=

ation

of

noise.

a

KR-A4020

DISASSEMBLY

FOR

REPAIR

Note:

Remove

the

case

before

starting.

Removing

the

front

panel

and

sub-panel.

No.

1

1.

Remove

the

three

screws

1)

and

three

claws

@

at

the

bottom,

then

remove

the

front

panel.

2.

Remove

the

two

screws

(3)

at

the

front,

then

remove

the

sub-panel.

3.

Remove

the

TONE,

VOL,

and

BALANCE,

knobs

@

.

Remove

the

MAIN

VR

@

.

5.

Remove

the

nut

6)

and

screw

7)

,

then

remove

the

SP

switch

@

and

the

TONE

VR

@.

MAIN

VR

©.

and

BALANCE

VR

)

PC

boards.

s

Note:

To

remove

the

SP

changeover

switch,

remove

the

small

mold

®

,

then

remove

the

screw

:

1,

With

the

front

panel

held

as

shown

in

the

figure.

remove

the

screw

®

,

then

remove

the

display

PC

board

©

:

KR-A4020

a2

Removing

the

main

PC

board

Remove

the

sub-panel,

then

remove

the

main

PC

board.

The

main

PC

board

can

be

removed

even

if

the

front

panel

and

sub-panel

have

not

been.

No.

4

1.

Remove

the

two

screws

(B

holding

the

X14

PC

board.

2.

Remove

the

three

screws

(®

;

two

at

the

sides

and

one

at

the

center)

from

the

rear

panel.

3.

Remove

the

rear

panel

with

the

X14

board while

push-

ing

the

claw

®

at

the

side

of

the

rear

panel

with

a

flat-bladed

screwdriver.

How

to

remove

the

repairing

chassis

1.

Cut the

6

parts

@

of

the

repairing

chassis.

Remove

the

repairing

chassis

from

main

chassis.

After

repair

2.

Turn

the

repairing

chassis

180

degrees

in

the

arrow

di-

rection

@

.

3.

Insert

the

2

claws

©

into

main

chassis.

4.

Lock

to

the

main

chassis

by

2

screws

(M3

x

6)

OQ.

KR-A4020

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mn

Ss)

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KR-A4020

Parts

No.

CIRCUIT

DESCRIPTION

RECEIVER

UNIT

(X14-2840-10)

Use/Function

Operation/Condition/Compatibility

LA1255

FM/AM

system

IC

FM

IF

amplification/detection/control,

AM

mixing

IF

amplification/detection

AN7470

PLL

synthesizer

IC

PLL

electronic

tuning

M7001

MPX

IC

MPX

demodulation

NJM45580-A

PHONO

EQ.

Amp.

TC4052BP

Input

Selector

Input

Selector

‘TC4052BP

Input

Selector

Input

Selector.

Tape=Source

uPC7812HF

+12

V

Regulator

+12

V

AVR

pPC1237HA

spi

Protection

CXP5016-520S

Micro

Computer

PST529C

ah

Reset

IC

2SC1923

(R,

Q)

FM

IF

Amp

10.7

MHz

amplification

2SC945(A)

(Q,

P)

2SC1740S

(QO,

R)

LPF

PLL

low-pass

filter

LPF

PLL

low-pass

filter

2SC1845

(F,

E)

2SC845(A)

(Q,

P)

2SC1740S

(Q,

R)

Buffer

L6

buffer

E

TYPE

ONLY

ag

Q11,

12

Tape/Source

Mute

Q23,

24

Q25,

26

Q27,

28

Q29,

30

2SA733(A)

(Q,

P)

2SA933

(Q,

R)

2SA733(A)

(Q,

P)

2SA933

(Q,

R)

2SC945(A)

(Q,

P)

2SC1740S

(Q,

R)

2SC2878(B

2SC4137

(V,

W)

2SB1493"5

=

FM +B

control

AM

+6

control

Emphasis

switch

Ideling

Current

2SD2255*5

Am

p.

Amp.

O31,

32

|

2SC1

845

(F,

E)

Electronic

switch

Electronic

switch

On:

75

us;

off

50

ps

Main

amplifier

final

2SA733(A)

(Q,

P)

2SA933

(Q,

R)

Mute

Drive

|

2SA733(A)

(Q,

P)

2SA933

(Q,

R)

Mute

Drive

2SC2003

(L,

K)

Regulator

2SB764

Regulator

+——

2SA733(A)

(Q,

P)

2SA9330

(Q,

R)

Protection

Drive

2SC945(A)

(Q,

P)

28C1740S

(Q,

R}

u-Com

Reset

<DT>

(X85-1170-00)

2SA937F

Ch-SPACE

SW

Use/Function

Operation/Condition/Compatibility

2SA992

(F,

E}

Differential

amplifier,

first

stage

2SC1845

(F,

E)

Differential

amplifier,

second

stage

2SA992

(F,

E)

Current

mirror

2SC945(A)

(Q,

P)

2SC17408S

(Q,

R)

2SC9465(A)

(Q,

P}

2SC1740S

(Q,

R)

+12

V

constant

voltage

Protection

-

KR-A4020

CIRCUIT

DESCRIPTION

1.

CXP5016-520S:

Receiver

microprocessor

(X14-284X-XX

:

IC9)

1-1.

Key

Matrix

connections

(F)

K

BACK

UP

CON.

Bee)

64

C185

47

N

PWM

Vop

+5V

mF/5.5V

KR:

KEY

RETURN

BACK

UP

PY2

WP

pyo

[S2=

Nc

fos

=

[62

PY3

EC

RMC

RES

(oe

peser

KRO

PXO

(4)

PxO

SC

KRO

EXTAL

XTAL

61

0

xi

4.194

MHz

SOB

KR1

0

SOA

KR2

INT1

S.

DATA

SI

KR3

inT2

[28

KR4

VFoPp

KRS

To

PS

1G

PD2

KR6

1155.

26

KR7

72

[24

3g

12}

aco

KSO

73/83.

ac

Pc1

KS1

T4O2.

56

ones

4

PC2

KS2

75

{2

Nc

a

PC3

KS3

16

N

PFO

KS4

17

NC

PTAPE

7348

nec

KR4

PDO

(8)

pours

18

1947.

si50

2

SELST

Si4n

]

DATA

$13m

CLOCK

$121

S11k

NC

$9i

NC

Sig

S6

f

S7e

S8d

$5c

S4b

S3a

PLL

LATCH

type

|

KRS_PD1(9)

3

ETvPEy

|

KR6

PD2

(10)

ee

Segments

LM7001

TC4052B8P

x2

1-2.

Setting

of

destinations,

models

and

specifications

depending

upon

diode

key

matrix

|

The

setting

of

destinations,

models

and

specifications

is

made

according

to

the

initial

set

diode

key

matrix.

|

In

the

following,

''1"'

means

‘with

diodes"

and

''0"',

"without

diodes".

1)

Model

Set

SW

Model

set

SW

Function

TYPE

MODEL

DOLBY

VOL.

CONT

Switched

“|

SURROUND

_

|

with

Moter

VIDEO1,

2

nEMOEON

KR-V6020

(OTHER)

|FM1—FM2—AM|

Provided

KR-V6020

(E

TYPE)

Not

provided

KR-A5520,

A5020

:

Not

provided

KR-A4020

;

:

Not

provided

t

Not

provided

eee

KR-A4020

10

CIRCUIT

DESCRIPTION

1-3.

Initial

Setting

1)

Function

initial

setting

Last

channel

MEMON)..............0:c

ee

FM

:

87.5MHz

AM

({K)

:

530kHz

AM

(E)

:

531kHz

TUNING

MOE...

eee

eeee

eee

ceserteeteetseeeeneceeeenetinceetaes

Auto

INPUt

SCLECTOL

....

eee

eeeceeeeeeeeteeeteeeteeeneeteeneeenes

FM1

MUtING

...ccccceccseesseeeeeeeeensceneeesecnesseeeeneeeneenateeeenesnes

OFF

2)

Microprocessor

output

port

initial

setting

Any

figure

in(

—)

is

a

number.

MITE

W(25)

ccsscscceteceveses

cseresrcastccncustes

destepwactdaettteees

H

MUTE

23

(26)

vveticatvcocsshiesreecsscityecs

rie

bilenativentereces

H

The

initial

setting

is

performed

in

a

following

event

:

1.

When

backup

memory

data

is

destroyed

when

reset

is

applied

to

the

microprocessor.

2.

When

the

power

cord

is

plugged

in

to

the

AC

wall

outlet

while

pressing

the

TUNER

key.

1-4.

Test

Mode

Setting

1)

Method

of

entering

the

test

mode

1.

While

pressing

the

CD

key.

plug

the

power

cord

to

the

AC

wall

outlet.

When

the

test

mode

is

en-

tered,

the

FL

tube

display

all

lights.

2)

Method

of

canceling

the

test

mode

1.

Unplug

the

power

cord

from

the

AC

wall

outlet

once.

2.

Send

the

reset

signal

to

the

RESET

or

some

other

means

to

reset

the

microprocessor.

3)

Contents

of

test

mode

1.

When

the

test

mode

is

entered,

the

FL

tube

display

all

lights.

This

all

lighting

continues

unless

a

effective

remote

control

serial

code

or

the

test

mode

is

can-

celed.

2.

The

test

frequency

is

stored

in

memory

for

each

preset

channel.

(For

each

frequency

to

be

stored

in

memory,

refer

to

its

associated

listing.)

1.

Frequency

memorized

for

each

PRESET

channel

when

the

memory

is

cleared

(Test

frequency)

Destination

K

E

K

E

K

£

1

87.5

MHz

87.5

MHz

|

87.5

MHz

87.5

MHz

530

kHz

531

KHz

3

90.0

90.0 87.5

87.5

990

4

92.0

87.5

1440

*

Set

for

AM1700

only.

2.

Destination

set

SW

:

E

type/K

type

Destination

|

Desti-

setSW_

jnation

Reception

frequency

band

87.5

~108.0MHz

530

~1610kHz

530

~1700kHz

87.5

~108.0MHz

531

~1602kHz

10kHz

50kHz

6

98.0

|

98.0 87.5

87.5

1700*

531

7

|

100.1

t

87.5.

87.5

|

530

|

531

8

102.0

i

102.0

87.5

op

87.5

530

531

9

|

106.0

87.5

I

87.5

530

i

531

10

108.0

4108.0

87.5

530

§31

3.

Specification

set

SW

:

AM1700k/AM1610K

With

destination

set

SW

at

“0”

:

Effective

only

for

K

TYPE

Specification

set

SW

AM

reception

frequency

band

530

~1610kHz

530

~1700kHz

name

Name

KR-A4020

CIRCUIT

DESCRIPTION

Function

PY1

PY2

BACK

UP

RMC

N.C.

Backup

(AC

outlet

off)

detection.

High:

Normal

state

ine

Low:

AC

outlet

off

When

the

power

is

switched

on,

high

is

input.

When

low

is

input,

the

microprocessor

stops

clock

generation

and

enters

the

backup

state.

|

When

the

signal

changed

from

low

to

high,

the

backup

state

changes

to

the

normal

state.

GND.

PX0~PX3

PDO~PD3

KRO~KR7

High:

There

is

input.

Low:

There

is

no

input.

KEY

RETURN

signal

input.

PCO~PC3

PFO

KSO~KS4

|

KEY

SCAN

signal

output.

Normally

high

is

output.

i

Key

scan

is

performed

when

KEY

is

ON.

PFI

PTAPE

pPD4052

(select

IC)

control.

Tape

monitor

on/off

control.

PSEL2

PSEL1

(H9070)

DATA

|

pPD4052

(selector

IC)

control.

pPD4082

(selector

IC)

control.

.

LM7001(PLL

IC)

control

serial

data

output.

Data

is

latched

on

the

rising

edge

of

the

clock.

CLOCK

LM7001,

contro!

serial

data

transfer

shift

clock

output.

Data

is

latched

on

the

rising

edge

of

the

clock.

PLLLT

MUTE

1

MUTE

2

SD

STEREO

CE

—

output

to

LM7001.

When

the

signal

is

high,

LM7001

is

enabled.

High:

MUTE

OFF

Low:

MUTE

ON

Righ:

MUTE

OFF

Low:

MUTE

ON

TAPE

2

REC

OUT

mute

control.

LINE

OUT

mute

control.

N.C,

Tuner

tuned

detection.

High:

NO

SIGNAL

Low:

TUNED

High:

MONO

Low:

Stereo

Tuner

FM

stereo

detection.

Unused

pin.

Unused

pin.

Vss

GND.

S0~S14

Fluorescent

display

segment

drive

signal

output.

T8~T5

NC.

T4~TO

Fluorescent

display

digit

drive

signat

output.

Veop

INT2

Unused

pin.

This

and

GND

are

shorted.

|

Unused

pin.

This

and

GND

are

shorted.

INT1

This

and

serial

data

input

30

are

shorted.

Clock

generation

circuit

output.

Clock

generation

circuit

input.

Reset

signal

input.

+5

V

power

supply.

11

KR-A4020

a

CIRCUIT

DESCRIPTION

IC6TRUTH

TABLE

_|

ICS

TRUTH

TABLE

|

TAPE

SELECTOR

|

PINNO.

|

OUTPUT

NO.

|

L

ch@®,

R

ch®@

10!

a

Lch@®,Rch®

|

9

|

10

|

TAPEREC

|

Li

PHONO.

|

L

|

H

|

TAPE PLAY

H

|

CD

cure

TUNER

lide

VIDEO/AUX

|

H

|

H

Ic6

IC5

TC4052BP

co

REC

PHONO.

OUTPUT

PLAY

TUNER

VIDEO/AUX

SEL1(1

9)

SEL2(1

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Kenwood KR-A4020 User manual

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