Kenwood KA-7090R User manual

STEREO

INTEGRATED

AMPLIFIER

KA-7090R

KENWOOD

SERVICE

MANUAL

1996-7/B51-5209-00

(K/K)

1949

Knob

(K29-3759-14)

Knob

(K29-6391-04)

Knob

(K29-6390-04)

KENWOOD

INPUT

SELECTOR

VOLUME

CONTROL

REMOTE

POWER

‘ORS

aNTBY

MAIN

POWER

——

OFF

SPEAKERS

SOURCE

DiRECT

LOUDNESS

REC

OUT

SPEAKERS

RHONES:

rey

SOURCE

GREC]

—

LOUCNESS

REC

OUT

ATT

-3008

=MM

STEREO

INTEGRATED

AMPLIFIER

KA-7090R|

Knob

Dressing

plate

Knob

(K27-2176-04)

(BO3-2972-13)

(K29-3759-14)

Phono

jack

Miniature

phone

jack

Slide

switch

(E63-0099-05)

(E11-0293-05)

(S62-0034-05)

Screw

terminal

board

(E70-0063-05)

Power

cord

bushing

(J42-0083-05)

}

LIE

X58:

SL16

xse

SIGNAL

GND

@QO©O@O©@E@©

12h

oes

pee

UNSW

TCHED.

Phono

jack

Phono

jack

(E63-0098-05) (E63-0099-05)

outlet

power

cord

Phono

jack

(E03-)

(E30-)

(E63-0102-05)

Refer

parts

list

page

26.

KA-7090R

CONTENTS

ACCESSORIES

Contents

CONTENTS

ACCESSORIES

......e.ecccecceeeeeeeeees

SCHEMATIC

DIAGRAM

DISASSEMBLY

FOR

REPAIR..........cccccsseseseseseseseseeees

EXPLODED

VIEW

cesseccceccccscesssccessessotessecstvncccnnnatscvevs

CIRCUIT

DESCRIPTION

Sic

iinet

anni:

Ar.

JPARTSIISE

cucu

ateninmauinidenimwnaecueonataed

ADJUSTMENT

stcigesieicheadyuetaletdeesl

eatecs puestd wteaka

SPECIFICATIONS

se3x

iss

Gatien

anennineawoate

BOARD

cictrctecinitertutesnsccnicuastitiassincsithootevvaitantis

Accessories

Remote

control

unit

(A70-1079-05)

Battery

cover

(A09-01

70-08)

KA-7090R

)

DISASSEMBLY

FOR

REPAIR

HOW

REPLACE

POWER

TRANSISTOR

Remove

screws

(@)fixing

audio

pcb

(X09).

Remove

left

side

screws

(@).

Remove

panel

top

screws

(@),

panel

bottom

screws(@)

and

fram

screw(@).

Remove

bottom

screws(Q),

rear

screws(@)

and

bottom

plate.

Lift

unit

arrow

direction(®).

(Power

transformer

bottom

side)

Replace

power

transistors.

KA-7090R

CIRCUIT

DESCRIPTION

FUNCTION

(1)

FEATURE

AUDIO

INPUT

“REC

OUT

K’s

Japanese

market

only.

COMPO(KA-7090R)

TAPE,

MD,

CD,

AUX,

TUNER,

PHONO

TAPE-MD,

MD-TAPE

CD,

AUX,

TUNER,

PHONO

DIRECT

LOUDNESS

MD/MONITOR

REMOCON

SYSTEM

CONTROL

SOURCE

DIRECT

MOTOR

VOLUME

(8/16)

HEADPHONE

SPEAKER

BACK

MODEL

CONDITION

eee

/B/A+B/

OFF

s_)

“SOURCE

DIRECT

__CD

DIRECT.

/B/AsB/

OFF

PORT2

(SERIAL

MODEL)

COMPO

(KA-7090R)

SERIAL

bit

K's

KAF-7002

SERIAL

bit

KAF-5002

INITIALIZING

FUNCTION

3-1.

Initializing

Operation

Insert

the

power

(set

the

POWER

key

ON)

for

initialization

while

pressing

the

ON/STAND_BY

key

even

the

system

the

backup

state.

After

the

microcomputer

reset,

set

the

port,

modes,

and

then

check

each

key.

the

ON/STAND_BY

key

pressed,

perform

the

RAM

ALL

CLEAR

operation

for

initialization.

the

ON/STAND_BY

key

not

pressed,

check

whether

the

system

the

backup

state.

Pull

out

the

power

(set

the

POWER

key

OFF)

destroy

the

backup

data

while

pressing

the

ON/STAND_BY

key.

3-2.

INITIAL

STAGE

FUNCTION

COMPO

(KA-7090R)

ON/STAND-BY

MODEL

KAF-7002

SYSTEM

OFF

SYSTEM

OFF

INPUT

SELECTOR

REC

OUT

TUNER

_KAF-5002_

SYSTEM

OFF

INE

REC

MODE

OFF

(OFF)

LOUDNESS

DIRECT

SOURCE.

DIR

MD/MONITOR

OFF

eile

DIRECT

OFF

DIRECTOFF

MUTING

BACK

DATA

WHEN

STAND-BY

DESIGNATION

INPUT

SELECTOR

COMPO

(KA-7090R)

SELECTOR

CONDITION

OFF

OFF.

OFF

MODEL

OFF

KAF-7002

SELECTOR

CONDITION

KAF-5002

SELECTOR

CONDITION

‘REC

OUT

POS

LOUDNESS)

DIRECT

SOURCE.

DIR

___

MD/MONITOR

MUTING

ON/OFF

CONDITION

ON/OFF

CONDITION

—

DIRECT

CONDITION

ON/OFF

CONDITION

DIRECT

CONDITION

DIR

CONDITION

MUTE

CONDITION

ON/OFF

CONDITION

MUTE

CONDITION

ON/OFF

CONDITION

MUTE

CONDITION

KA-7090R

CIRCUIT

DESCRIPTION

TEST

MODE

5-1.

Test

Mode

using

Main

Unit’

Keys

(1)

Setting

the

test

mode

Turn

on the

power

while

pressing

the

“LOUDNESS”

key.

(2)

Canceling

the

test

mode

initialize

the

system

and

cancel

the

test

mode,

turn

off

the

power.

(3)

Contents

test

mode

The

muting

during

mode

selection

not

controlled

the

test

mode.

However,

the

operation

when

the

power

turned

the

same

for

the

normal

operation.

The

speaker

protection

operation

also

the

same

for

the

normal

operation.

(4)

Automatic

POWER

The

POWER

state

entered

for

model

discrimina-

tion

whenever

the

power

turned

while

pressing

the

“LOUDNESS”

key.

All

the

functions

are

then

initialized

and

activated

the

all-lighting

mode.

the

all-lighting

mode,

the

selector

display

LED

lights

sequentially.

For

KAF-7002/5002,

the

SOURCE

DIRECT

and

DIRECT

display

LEDs

light

alternately.

For

KA-

7090R,

the

SOURCE

DIRECT

display

LED

lights.

The

and

display

LEDs

not

light.

All

other

LEDs

light.

The

all-lignhting

mode

canceled

when

any

the

main

unit’

keys

pressed.

The

normal

display

obtained

when

the

selector

set

TUNER

then

appears.

(5)

Special

operation

“LOUDNESS”

key

(a)

When

this

key

pressed,

the

LOUDNESS

display

LED

lights

and

the

electric

volume

turns

for

sec-

onds.

After

seconds,

the

electric

volume

stops

and

the

display

LED

goes

off.

(b)

When

this

key

pressed

during

operation

after

operation

step

(a),

the

LOUDNESS

display

LED

lights

and

the

electric

volume

turns

down

for

seconds.

After

seconds,

the

electric

volume

stops

and

the

display

LED

goes

off.

(c)

When

this

key

pressed

during

operation

step

(b),

the

LOUDNESS

display

LED

goes

off

and

the

electric

volume

stops.

(d)

The

operation

step

(a)

carried

out

when

this

key

pressed

after

operation

step

(c).

After

that,

the

oper-

ation

steps

(a)

(c)

repeated

every

time

this

key

pressed.

The

operation

not

canceled

even

another

key

pressed

while

the

electric

volume

turns

and

down.

“SPEAKER

A+B”

When

the

switch

set

this

position,

the

SPEAKER

LED

(for

only

the

KA-7090R)

lights

and

the

audio

mut-

ing

turned

on.

When

the

switch

set

another

posi-

tion,

the

LED

goes

off

and

the

audio

muting

turned

off.

“MD

MONITOR”

key

(for

only

KAF-7002/5002)

When

this

key

pressed,

the

MUTE

display

LED

lights

and

the

audio

muting

turned

on.

When

this

key

pressed

again,

the

audio

muting

turned

off

and

the

dis-

play

LED

goes

off.

“ATT.

-30dB”

key

(for

only

KA-7090R)

When

this

key

pressed,

the

ATT.

LED

lights

and

the

ATT.

-30dB

turned

during

normal

operation.

The

REC

muting

turned

while

the

REC

OUT

mode

set

ON.

When

this

key

pressed

again,

the

ATT.

REC

muting

canceled

and

the

ATT.

LED

goes

off.

“REC

OUT”

key

(for

only

KA-7090R)

When

this

key

pressed,

the

REC

OUT

LED

lights

and

the

REC

OUT

mode

set

ON.

The

operation

not

canceled

until

this

key

pressed

again.

The

REC

mut-

ing

canceled

when

the

operation

canceled.

“8/16-bit

selector

switch”

(for

only

KA-7090R)

The

system

enters

the

all-lighting

mode

this

switch

set

the

8-bit

position

when

the

ATT.

key

after

the

all-lighting

mode

canceled.

The

serial

POWER

code

output

that

time

(code

“25H”

output

when

the

test

mode

activated

the

8-bit

position,

and

code

“0800”

output

when

activated

the

16-bit

posi-

tion).

The

all-lighting

mode

canceled

when

this

switch

set

the

16-bit

position

again

when

the

ATT.

key

pressed.

The

normal

display

then

appears.

5-2.

Serial

Test

Mode

(1)

Setting

the

test

mode

The

serial

test

mode

entered

serial

“71H”

code

received

only

when

the

KA-7090R

the

8-bit

mode.

After

that,

only

the

16-bit

mode

accepted.

other

cases,

the

serial

test

mode

entered

when

serial

“C27FH”

code

received.

(2)

Canceling

the

test

mode

The

serial

test

mode

canceled

when

“C27FH”

code

received.

this

case,

the

system

not

initial-

ized.

The

serial

code

also

remains

set

the

16-bit

posi-

tion.

When

the

power

(main

power)

turned

off,

the

serial

test

mode

canceled

and

the

system

initialized.

(3)

Contents

test

mode

The

serial

code

for

test

shown

the

attached

list

analyzed

for

processing.

the

test

mode,

mute

signal

output

shorten

the

input/output

selection

time

during

measurement.

Howev-

er,

the

operation

when

the

power

turned

the

same

for

the

normal

operation.

The

speaker

protection

operation

also

the

same

for

the

normal

operation.-

The

code

input

the

test

mode

serial

communication

validated

irrespective

the

dis-

play

mode.

KA-7090R

CIRCUIT

DESCRIPTION

The

all-lighting

mode

canceled

using

all-lighting

cancel

code.

After

cancellation,

the

normal

display

appears.

the

all-lighting

mode,

the

selector

display

LED

lights

sequentially.

For

KAF-7002/5002,

the

SOURCE

DIRECT

and

DIRECT

display

LEDs

light

alternately.

For

KA-

7090R,

the

SOURCE

DIRECT

LED

lights.

The

SPEAK-

LED

does

not

light.

All

other

LEDs

light.

The

REC

OUT

selector

operated

inputting

the

code

the

selector

after

REC

MODE

code

input

(for

only

KA-7090R).

The

main

unit’

keys

can

pressed

even

the

serial

test

mode.

However,

the

operation

not

guaranteed

this

case.

The

operation

when

the

code

having

function

not

con-

tained

the

corresponding

model

input

not

guaran-

teed.

The

REC

muting

canceled

MUTE

ALL

OFF.

KA-7090R

CIRCUIT

DESCRIPTION

Microprocessor

periphery

block

diagram

(K's

KAF-7002,5002)

(KA-7090R)

POWER

AUDIO

MUTE

HEAD

PHONE

—

SERIAL

DATA,

BUSY

MOTORVOL

UP/DOWN

KEY

INPUT

(ROTARY

SW)

INPUT INPUT

(ROTARY

SW)

SELECTORIC

(K's)

DATA,

CLOCK,

BUSY

TC9162

(FUNCTION

SW)

TC9164

(REC

OUT

SW)

SELECTOR

(KA-7090R)

DATA,

CLOCK

BUSY

(TC916X)

CLR,

STB(NJU3711)

TC9162

(FUNCTION

SW)

TC9164

(REC

OUT

SW)

NJU3711(INPUT

SEL

SW)

LED

DISPLAY

x13

SELECTOR

LED

/RELAY

CONTROL

REC

OUT

LED

A.T.T.

LED

ON/STANDBY

LED

LOUDNESS

LED

DIRECT

LED

RELAY

(KA-7090R)

LED

DISPLAY

SELECTOR

LED

MD/MONITOR

LED

MUTE

LED

ON/STANDBY

LED

LOUDNESS

LED

DIRECT

LED

RELAY

(K's)

(K's

KAF-7002,5002)

DIRECT

ENCODER

REMOCON

PROTECTION

RESET

ee)

feat

)

“a

DESTINATION

COMPO/K's

DISCRIMINATION

8/16

bit

CHANGE

OVER(KA-7090R)

DESTINATION

COMPOKK's

DISCRIMINATION

KAF-7002/5002

DISCRIMINATION

(K's)

KA-7090R

CIRCUIT

DESCRIPTION

6-1.

Microprocessor

connection

‘awn

AWS

S19}9}

“ALUI}

BES

S18}}9|

DOA

LaSay

NOILOALOYd

NOOOWSY

(g)4SGOONS

HIG

‘S

(v)HAGOONS

HIG

ads

vds

yId

‘GO

Bunyby

wqiyul

yiq

“AQUNOS

SSSNGNO01

Ag-GNV.LS/NO_

‘y0n0

aBueYo

ARjoYy

3dVL

Buyy6y

wor

ywqiyuj

YANNL

ONOHd

LAdNI

NOILYNILS3Q

1dOd

lyodaa

[|_|

SSA

LNOX

LNOx

—_

NIX

1asay

4auA

4ayA

NOILOALOWd

=——>

NOOOWSH

——>

—P

—_

it)

(LIZenrnyaLs

10A

HOLOW

10A

HOLOW

yid

‘3OuNOS

NMOd

10A

HOLLOW

NMOG

10A

HOLOW

SSANGNO1

ASN

WIdas

ASN

Witas

A@-GNVLS/NO

Viva

IWidas

viva

IIdas

adv

[Ss

3NOHd

GvaH

3NOHd

GvaH

SLAW

olany

A.LAW

olan

0€-

ONILLNW

08:

DNILAW

xnv

HOLINOWOW

d31.LNO

934

YANNL

(LLZENPN)Y1O

ONOHd

LNdNI

H3MOd

H4MOd

YAO

SDNVHOS1/8

——

NOILVNILSAG

NOILVNILSSO

wOCOLYS

Sid

e]O6OLY>!

KA-7090R

)

CIRCUIT

DESCRIPTION

)

16bit

serial

test

code

(C2XXH)

TYPE

FUNC

:Sendingcode

|}:

6-2.

connection

NAME

KA-7090R

CIRCUIT

DESCRIPTION

DESTINATION

COMPOKK's

DISCRIMINATION

PORT

POWER

RELAY

CONTROL

TERMINAL

COMPO

CLR

xIyjrc\|r

CONTROL

IC(NJU3711)CLR

SIGNAL

OUTPUT

TERMINAL(KA-7090R)

NOT

USED

rly

K's

MONITOR

“REC OUT"

LED

CONTROL

TERMINAL

(KA7090R)

"MD

MONITOR"

LED

CONTROL

TERMINAL

MUTING-30

COMPO

“AeTeT"

LED

RELAY

CONTROL

TERMINAL

(KA-7090R)

K's

MUTE”

LED

TERMINAL

AUDIO

MUTE

"MUTING"

SIGNAL

OUTPUT

TERMINAL

HEAD

PHONES

ps ee

HEAD

PHONES

CONTROL

TERMINAL

CTlrcjir

DATA

SERIAL

DATA

BUSY

SERIAL

BUSY

DOWN

VOLUME

DOWN

SIGNAL

OUTPUT

TERMINAL

VOLUME

SIGNAL

OUTPUT

TERMINAL

KEY

(TACT)

KEY

INPUT

TERMINAL

KEYS

(KA-7090R)

KEY

INPUT

TERMINAL

KEYS

(K's)

SPEAKER

SEL

SPEAKER

SELECTOR

“

INPUT

TERMINAL

SEL

DATA

SELECTOR

DATA

SEL

CLOCK

SELECTOR

CLOCK

SEL

SELECTOR

STROBE

INPUT

SEL

REF

INPUT

SELECTOR

INPUT/CONTROL

TERMINAL

A/D

REFERENCE

VOLTAGE

OSCILLATOR

(8MHz)

OUT

OSCILLATOR

(8MHz)

VSS

GND

VCC

+5V

NOT

USED

MICROPROCESSOR

CHIP

ENABLE

RESET

SIGNAL

INPUT

TERMINAL

PROTECTION

DETECTION

REMOCON

REMOTE

CONTROL

INPUT

TERMINAL

SOURCE.DIR

;

COMPO

—

NOT

USED

K's

ROTARY

ENCODER

SIGNAL

INPUT

TERMINAL

SOURCE.DIR

COMPO

—

NOT

USED

K's

ROTARY

ENCODER

SIGNAL

INPUT

TERMINAL

SPEAKER

RELAY

CONTROL

TERMINAL

SPEAKER

RELAY

CONTROL

TERMINAL

lou

Renke)

COMPO(NJU3711)CONTROL

SIGNAL

OUTPUT

TERMINAL

(KA-7090R)

K's

"CD.DIR"LED

CONTROL

TERMINAL

SOURCE

DIR

"“SOURCE.DIR"LED

CONTROL

TERMINAL

LOUDNESS

"LOUDNESS"

LED

CONTROL

TERMINAL

ON/STANDBY

“ON/STANDBY"

LED

CONTROL

TERMINAL

INPUT

TAPE

"TAPE"

LED/RELAY

CONTROL

TERMINAL

"MD"

LED/RELAY

CONTROL

TERMINAL

"CD"

LED/RELAY

CONTROL

TERMINAL

AUX

"AUX"

LED/RELAY

CONTROL

TERMINAL

TUNER

"TUNER"

LED/RELAY

CONTROL

TERMINAL

PHONO

0;0/0/0)/0}/0;0;

0/0

"PHONO"

LED/RELAY

CONTROL

TERMINAL

COMPO

8/16

K's

DESTINATION2

SERIAL

8/16

BIT

DISCRIMINATION

TERMINAL

(KA-7090R)

KAF-7002

MODEL

DISCRIMINATION

TERMINAL

KAF-5002

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