Kenwood KR-A4010 Manuale utente

AM/FM

STEREO

RECEIVER

KR-A4010

SERVICE

MANUAL

Panel*

Metallic

cabinet

(A20-)

(A01-1746-01)

KENWOOD

ier

sipcness

rnin

Rasxaord

KENWOOD

1989-5

PRINTED

JAPAN

B51-3894-00

(O)

3012

Front

glass

(B10-1006-03)

Phone

jack

Knob

(E11-0162-05)

(K27-1987-04)

Lock

terminal

board

Bindinng

post

{E20-)

(NO8-0128-35)

FSot*

Phono

jack

(J02-)

(E13-0446-05)

Slide

switch

($31-2136-05)

Phono

jack

(E13-0621-05)

Knob

(K29-3598-04)

Terminal

board

(E20-0823-05)

outlet*

({E03-)

Slide

switch

(S31-2132-05)

(E30-)

Knob

(K29-3597-04)

Knob

(K27-1725-04)

(K29-3632-04)

Slide

switch

($31-3010-05)

Power

cord

bushing

(J42-0083-05)

power

cord*

Refer

parts

list

page

38.

KR-A4010

CONTENTS

DISASSEMBLY

FOR

REPAIR

..............::c::seseeeseeeees

ADJUSTMENT

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BLOCK

DIAGRAM

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REGEAGE:

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CIRCUIT

DESCRIPTION

PABGLEICH

oii

ics

sccesscciecieaceccaacve

ctusecttseeteccdesoeseeseet

Description

components

............::::cseeeeeseeees

ADJUSTMENT/REGLAGE/ABGLEICH

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

Microprocessor

uPD7538AC-041

VOLTAGE:

TABLE

oes.

cs.

hcsccscccescbccccneendetediesncestcctes

(X11-2650-10

1C1)

oo...

ceeeeceeeeeeseeeereeeeeeeseeeenenesenes

BORD

(COMPONENT

SIDE

VIEW)

.............06

PLL

CX7925B

(X14-2540-10

IC2)

.....

eeeeseees

BORD

(FOIL

SIDE

VIEW).............ccsscsssrscsersees

MPX

AN7470

.(X14-2540-10

1C3)

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

SCHEMATIC

DIAGRAM

..............:ccsccsessereesersenecsenes

STK4171/5

Main

amplifier

EXPLODED

VIEW.............::.::ccescccssseeseseeensensneenseennee

(X14-2542-71:

1C7)

type

........::sseseeeeeeees

PARTS:

LIST:

silceceses

ees

atieseiiln

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aateesa

haste:

STK4172/2

Main

amplifier

SPECIFICATIONS

............:cssseeeeeeeenenens

BACK

COVER

(X14-2540-XX

1C7):

type..............006+

KR-A4010

DISASSEMBLY

FOR

REPAIR

Befor

repair

work,

take

out

the

case.

Remove

the

five

screws,

then

detach

the

front

panel

(@).

Remove

the

two

screws

then

undo

the

catch

the

sub

panel

Remove

the

one

screw

Undo

the

catch

the

PHONES,

then

detach

the

PONES

boad

(X14-)

(B/3)

Detach

the

knob

using

screwdriver

(@).

Undo

the

catch,

then

the

knob

(@).

Remove

the

one

screw

(@)

and

the

one

hook

(@),

then

detach

the

PCB.

Remove

the

one

screw

(@),

then

detach

the

power

switch.

Remove

the

six

screws

(@)

and

the

twelve

screws

then

detach

the

display

board

(X11-)

(A/2).

KR-A4010

DISASSEMBLY

FOR

REPAIR

When

repairing

checking

the

main

board

and

power

supply

refer

the

following

steps.

Remove

the

five

screws

(@).

Remove

the

six

screws

this

way,

the

terminal

mold

will

hit

against

the

chassis.

avoid

this,

lift

the

main

body

putting

aside

the

rear

panel

the

direction

arrow

(@)(@).

KR-A4010

BLOCK

DIAGRAM

Olt-OvSZ-blLx

01-0692-11X

Ol-ObG2-b

;

(6)

Avid

SS3NQNNO1

IdVL

S3NOHd

TOA

€eS

pence

aesa

amram

acres

O3GIA

LYA

©)

4yO1L9373S

vat

SY3nNVadSs

291

[or

oon

(ATNO

3dVL

169)

AV138

vol

Bens

teas

ects

Pes

toe

NS,

Leet

Ol-OvS2

—

3d‘71

Z9l

£91

Lol

p~lod

KR-A4010

CIRCUIT

DESCRIPTION

Description

Components

CONTROL

UNIT

(X11-265X-XX)

0-10:

K,P

0-21:M

2-71:X,T,E

Part

No.

Use/Function

Operation/Condition/Compatibility

IC1

pPD7538AC-041

Micro

computer

IC2

PST529C

Reset

2SA733

(A)

(Q,P)

Cannel

space

selection

9kHz,

50kHz

OFF

10kHz,

100kHz

2SA933S

(Q,R)

2SA733

(A)

(Q,P)

Indication

driver

TUNED

display

2SA933

(Q,R)

2SA733

(A)

(Q,P)

Indication

driver

STEREO

display

2SA933

(Q,R)

2SC945

(A)

(Q,P)

LED

driver

For

PHONO

2SC1740S

(Q,R)

RECEIVER

UNIT

(X14-254X-XX)

0-10:

K,P

0-21:M

0-71:X

2-71:T,E

Part

No.

Use/Function

Operation/Condition/Compatibility

1C1

LA1265

FM/AM

system

amplifier

detection

and

control

mixing,

amplifier

and

derection.

IC2

CX-79258

PLL

for

frequency

synthesizer

PLL

for

electronic

tuning.

IC3

AN7470

MPX

demodulator.

IC4

NJM4558D-A

Equalizer

amplifier

Equalizer

amplifier

for

PHONO

(MM).

M5218P-A

IC5

LC7820

Input

selector

Analog

switch

for

input

selector

switches.

STK4172/2

Main

amplifier

Main

amplifier

(2ch).

(K,P,M,X

type)

1C7

STK4171/5

Main

amplifier

Main

amplifier

(2ch).

(T,E

type)

IC8

PC7812HF

Constant

voltage

power

supply

3-pin

regulator

for

the

+12V

constant

voltage

supply.

2SK241

amplifier

High-frequency

amplifier.

(K,P,M,X

type)

2SK73

amplifier

High-frequency

amplifier.

(T,E

type)

2SC1923

(O)

Mixing

Frequency

converter.

2SC1923

(R,O)

OSC

Local

oscillator.

2SC1923

(R,O}

OSC

buffer

OSC

OUT

(oscillator

output)

for

synthesizer.

2SK161

(Y,GR)

OSC

buffer

For

local

oscillator

input

mixer.

(T,E

type)

2SC1923

(R,O)

amplifier

10.7MHz

amplifier.

2SC1845

(F,E)

LPF

Low

pass

filter

for

PLL.

2SC1740S

(Q,R)

LPF

Low

pass

filter

for

PLL.

2SC945

(A}

(Q,P}

25C1740S

(Q,R)

Buffer

for

(T,E

type)

2SC945

(A)

(Q,P}

Q10,11

25C1740S

(Q,R)

Emphasis

switch

for

75s,

OFF

for

501s.

(

type)

2SC945

(A)

(O,P)

Q12

DTC124ES

control

Q13

DTA114ES

control

Q14

DTC124ES

control

Q15

DTA114ES

control

Q17,18

25C2878

(B)

Muting

TAPE

REC

OUT

pop

noise

prevention

during

switching

selector

switch.

Q19

2SA933S

(Q,R)

Muting

control

Main

amplifier

pop

noise

prevention

during

switching

selector

switch.

2SA733

(A}

(Q,R)

Q20,21

2S$C2878

(B)

Muting

Main

amplifier

pop

noise

prevention

during

switching

selector

switch.

Q22

2SA933S

(Q,R)

Muting

control

2SA733

{A}

(Q,P)

Q25

2SA933S

(Q,R)

Muting

Main

amplifier

pop

noise

prevention

during

switching

power

switch.

2SA733

{A}

(Q,P)

Q26,27

2SC1845

(F,E)

Protection

Q28

2SA945

(L,K)

Regulator

power

supply

Output

transistor

for

24V

control

voltage

supply.

Q29

2SA933S

(Q,R}

Error

amplifier

-12V

error

amplifier.

2SA733

(A)

(Q,P)

Q30

2SA945

(L,K)

Constant

voltage

circuit

-12V

Q32

2SC2003(L,K)

Regulator

power

supply

Output

transistor

tor

constant

voltage

supply.

CIRCUIT

DESCRIPTION

Microprocessor

PD7538AC-041

(X11-2650-10

IC1)

Terminal

connection

diagram

key

matrix

connection

KR-A4010

Lil

Reset

ves

|-=e

cli

POO/INTO

vest

PO3/S!

(vem)

AUTO

STEREO

P53

P30

PHONO/MAIN

P52

P31

SUB

PSI

P32

(1)

(>)

MUTE

P50

P33

ee?

bae

SEG

P40

CX7925S

CLK

P2I7POUT

P42

coveann

«<2

Pi03

P43

pai

Tuner

«<4

pioz

P80

VIDEO/TEST

PIO!

Pal

TAPE/Bilingual

P100

P82

PUB

(ee

P83

Grip

Video

(co)

Pil2

P30

DATA

P9l

BUSY

PIO

P92

Voo

P93

POWER

LiL

Block

diagram

POO/INTO

ZERO-

CROSS

DETECTOR

CLOCK

CONTROL

TIMER/EVENT

COUNTER

INTERRUPT

CONTROL

P80

PO1/SCK

PO2/SO

SERIAL

INTERFACE

PROGRAM

MEMORY

INSTRUCTION

4096x8

BITS

DECODER

SYSTEM

CLOCK

GENERATOR

STANDBY

CONTROL

CLI

CcL2

Vop

Vss_

«RESET

GENERAL

REGISTERS

STACK

POINTER(8)

DATA

MEMORY

160x4

BITS

Bond Bond

fo)

PO3/S1

Band

Vere

VioAD

lee

POO-PO3

PORT2

LATCH

BUFFER

P2I-P23

PTOUT/P2!

LATCH

BUFFER

PORT4

LATCH

pao-pa3

BUFFER

PORTS

LATCH

BUFFER

PORTS

LATCH

BUFFER

PORTS

LATCH

BUFFER

P90-P93

PORTIO

LATCH

BUFFER

K"4_)

P100-P103

PORTI1

LATCH

BUFFER

PO-PH3

KR-A4010

CIRCUIT

DESCRIPTION

Function

the

diode

switch

Models

for

each

designated

area

and

function

setting

switches

Model

for

desig-

Set

switch

Receiving

Channel

Reference

Middle

nated

area

Band

3|/Band

2/Band

frequency

range

spacing

frequency

87.5

108

MHz

100

kHz

10.7

MHz

530

1610

MHz

kHz

450

kHz

87.5

108

MHz

kHz

10.7

MHz

531

1602

kHz

450

kHz

163

281

kHz

450

kHz

0 0

type

(without

LW)

Band

Overseas

Domestic

(Japan)

Band

FMch

space

kHz

AMch

space

kHz

FMch

space

100

kHz

AMch

space

kHz

Band

Without

auto

tuning

function

only

for

broadcast

Band

With

LW:

Indication

(FM,

MW,

LW)

Without

LW:

Indication

(FM,

AM)

key

not

accepted.

Stop

frequency

select

switch

for

auto

tuning

Setting

this

switch

can

changed

without

reception

resetting

(unplugging/plugging

the

cord.)

This

switch

used

set

the

frequency

which

intakes

the

signal

band

reception.

For

both

manual

and

auto

tuning,

the

tuning

frequency

changed

9N-+

|Frequency/Channel|Reference|

Middle

Stop

/9N

range

spacing

frequency

down

kHz

step,

however,

auto

tuning

mode,

the

153

155,

164

.....

281

kHz

KHz

kHz

450

kHz

525587

receiving

frequency

stops

the

following

frequency

163

153,

162...

selected

this

switch.

281

kHz

450

kHz

950979

KHe

Auto

tuning

Others

Auto

tuning

Auto

tuning

function

Auto/Mono

KEY

Function

Preset

Not

available

Mono/Stereo

function

only

Available

This

key

also

used

the

Auto/Man-

ual

tuning

mode

key

Set

switch

KR-A4010

CIRCUIT

DESCRIPTION

Port

allocation

Function

Key

return

signal

input

Key

return

signal

input

Key

return

signal

input

Key

return

signal

input

PLL

(CX7925B)

Function

(LC7820)

Data

output

PLL

(CX7925B)

LAT

output

PLL

(CX7925B)

CLK

output

oO}

display

segment

output:

Tyr}

{Tz}

TTT

Function

(LC7820)

Key

strobe

signal

output.

Key

strobe

signal

output,

display

segment

output:

Key

strobe

signal

output.

display

segment

output:

Key

strobe

signal

output.

display

segment

output:

-1O}W!/N

xrjxrjrl/t

Key

strobe

signal

output,

Key

strobe

signal

output.

display

segment

output:

display

segment

output:

(0)

oOo

Key

strobe

signal

output,

display

segment

output:

Key

strobe

signal

output,

display

segment

output:

TFIO;T/MDIQl

o;T]o

Key

strobe

signal

output

display

segment

output

display

digit

control

pin:

GRID

display

digit

control

pin:

GRID

display

digit

control

pin:

GRID

—-}O!}a

NIN

ames)

lox

Ke)

}Tl/TyryTt

Power

supply

input

(5V)

display

digit

control

pin:

GRID

display

digit

control

pin:

GRID

display

digit

control

pin:

GRID

Input

port:

mode

“Bilingual”

(H)

Output

port:

Receiver

selector

“TAPE”

Input

port:

TEST

(H)

Output

port:

Receiver

selector

“VIDEO”

Receiver

selector

“TUNER”

Receiver

design:

Receiver

selector

“CD”

System

component

design:

Band

data

output

(UHF:

Serial

signal

BUSY

Serial

signal

DATA

Back

detection

Station

detection

for

auto

tuning

mode

OWN}

-|O]

Muting

signal

SUB

Receiver

design:

Receiver

selector

“PHONO”

System

component

design:

MAIN

Stereo

(L)

MONO/SST

key

control

Mono

(H)

Reset

signal

Clock

Power

supply

for

display

pre-driver

Power

supply

for

display

driver

(—

30V)

KR-A4010

CIRCUIT

DESCRIPTION

Key

matrix

layout

POO

(41)

PO1

(40)

PO2

(39)

PO3

(38)

P30

(37)

DOWN

AUTO

MONO

Preset

P31

(36)

Scan

P32

(35)

——_--+

P33

(34)

P40

(33)

Sound

multiplex

P42

(31)

Auto

tuning

P41

(32)

*16

Preset

P43

(30)

Receiver

Values

brackets

(

Band

*Band

)

shows

the

number

P80

(29)

microcomputer.

items

with

asterisk

(")

shows

the

diode

switch.

Others

are

momentary

switches.

(9N+2/9N)

the

slide

switch

the

rear

panel.

Key-intake

active

high.

Tuner

function

Manual

tuning

Each

time

the

UP/DOWN

key

pressed,

the

tuning

frequency

varied

one

step

higher

lower.

When

this

key

kept

pressed

for

than

0.5

seconds,

the

frequency

changed

down

approx.

128

msec/step

(approx.

224

msec/step

for

reception)

until

the

key

released.

Auto

tuning

When

the

AUTO/MONDO

switch

set

AUTO,

press-

ing

the

UP/DOWN

key

starts

auto

tuning.

The

tuning

frequency

changed

down

approx.

128

msec/step

(approx.

224

msec/step

for

reception)

until

the

high-level

signal

input

the

pin.

When

the

high-level

signal

input,

auto

tuning

operation

stops.

Preset

memory

frequencies

(the

maximum

number

preset

stations

set

the

diode

switch)

can

preset

randgmly

for

FM,

(AM)

and

(TV)

stations.

How

preset

When

the

MEMORY

key

pressed,

the

MEMORY”

indicator

lights

and

the

unit

set

the

write-enable

Status.

Writing

memory

possible

for

approx.

seconds

after

the

MEMORY

key

pressed.

During

this

time,

pressing

any

the

numeric

key

—

10)

will

write

the

currently-received

frequency

into

memory

corre-

sponding

the

key

pressed.

How

recail

When

the

tuner

functions,

pressing

any

the

preset

keys

will

recall

the

stored

contents

corresponding

the

key

pressed.

Preset

scan

When

the

PRESET

SCAN

key

pressed,

the

goes

high

level.

preset

channel

received

for

Test

frequency

530

630

Test

mode

set-up:

87.5

89.1

1440/1602]

153

Set

the

test

(P15)

high

level,

and

invert

low

level

after

turning

the

power

ON.

(The

entire!

display

will

light

except

for

MEMORY.)

seconds,

then

the

receiving

frequency

changed

the

preset

channel.

When

the

low

level,

the

receiving

channel

changed

the

preset

channel

after

one

second.

Key

processing

during

scanning

Preset

key:

Stops

the

scanning

operation

and

receives

the

frequency

the

designated

preset

channel.

UP/DOWN

key:

Stops

the

scanning

operation

and

processes

the

UP/DOWN

function.

Indice

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