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

en

REMOTE

POWER

|

:

‘ORS

aNTBY

MAIN

POWER

——

ON

OFF

SPEAKERS

A

B

SOURCE

DiRECT

LOUDNESS

REC

OUT

SPEAKERS

oF

ke

®

RHONES:

rey

SOURCE

GREC]

—

LOUCNESS

REC

OUT

ATT

-3008

=MM

MC

a

®

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@©

oe

Ss

12h

oes

pee

UNSW

TCHED.

Phono

jack

Phono

jack

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

AC

outlet

*

AC

power

cord

*

Phono

jack

(E03-)

(E30-)

(E63-0102-05)

*

Refer

to

parts

list

on

page

26.

KA-7090R

CONTENTS

/

ACCESSORIES

Contents

CONTENTS

/

ACCESSORIES

......e.ecccecceeeeeeeeees

2

SCHEMATIC

DIAGRAM

DISASSEMBLY

FOR

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

3.

EXPLODED

VIEW

cesseccceccccscesssccessessotessecstvncccnnnatscvevs

CIRCUIT

DESCRIPTION

Sic

iinet

anni:

Ar.

JPARTSIISE

cucu

ateninmauinidenimwnaecueonataed

ADJUSTMENT

stcigesieicheadyuetaletdeesl

eatecs puestd wteaka

11

SPECIFICATIONS

se3x

iss

Gatien

anennineawoate

PC

BOARD

s

cictrctecinitertutesnsccnicuastitiassincsithootevvaitantis

13

Accessories

Remote

control

unit

(A70-1079-05)

Battery

cover

(A09-01

70-08)

|

KA-7090R

)

DISASSEMBLY

FOR

REPAIR

HOW

TO

REPLACE

POWER

TRANSISTOR

1.

Remove

5

screws

(@)fixing

audio

pcb

(X09).

2.

Remove

left

side

screws

(@).

3.

Remove

panel

top

screws

(@),

panel

bottom

screws(@)

and

fram

screw(@).

4.

Remove

bottom

screws(Q),

rear

screws(@)

and

bottom

plate.

5.

Lift

unit

to

arrow

direction(®).

(Power

transformer

is

bottom

side)

6.

Replace

power

transistors.

KA-7090R

CIRCUIT

DESCRIPTION

1.

FUNCTION

(1)

FEATURE

_

AUDIO

INPUT

_

“REC

OUT

*

K’s

is

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

f

if

©

(8/16)

|

HEADPHONE

SPEAKER

|

BACK

UP

2.

MODEL

CONDITION

eee

A

/B/A+B/

OFF

an

s_)

“SOURCE

DIRECT

__CD

DIRECT.

A

/B/AsB/

OFF

PORT2

(SERIAL

/

MODEL)

H

COMPO

(KA-7090R)

_

SERIAL

8

bit

K's

KAF-7002

L

SERIAL

16

bit

KAF-5002

3.

INITIALIZING

FUNCTION

3-1.

Initializing

Operation

-

Insert

the

AC

power

(set

the

POWER

key

to

ON)

for

initialization

while

pressing

the

ON/STAND_BY

key

even

if

the

system

is

in

the

backup

state.

-

After

the

microcomputer

is

reset,

set

the

port,

modes,

and

register,

then

check

each

key.

*

If

the

ON/STAND_BY

key

is

pressed,

perform

the

RAM

ALL

CLEAR

operation

for

initialization.

*

If

the

ON/STAND_BY

key

is

not

pressed,

check

whether

the

system

is

in

the

backup

state.

*

Pull

out

the

AC

power

(set

the

POWER

key

to

OFF)

to

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

i

INE

REC

MODE

OFF

(OFF)

LOUDNESS

DIRECT

SOURCE.

DIR

MD/MONITOR

OFF

eile

th

DIRECT

OFF

DIRECTOFF

MUTING

.

BACK

UP

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

S.

DIR

CONDITION

_

~

MUTE

CONDITION

_

ON/OFF

CONDITION

MUTE

CONDITION

ON/OFF

CONDITION

MUTE

CONDITION

KA-7090R

CIRCUIT

DESCRIPTION

5.

TEST

MODE

5-1.

Test

Mode

using

Main

Unit’

s

Keys

(1)

Setting

the

test

mode

Turn

on the

power

while

pressing

the

“LOUDNESS”

key.

(2)

Canceling

the

test

mode

-

To

initialize

the

system

and

cancel

the

test

mode,

turn

off

the

power.

(3)

Contents

of

test

mode

+

The

muting

during

mode

selection

is

not

controlled

in

the

test

mode.

However,

the

operation

when

the

power

is

turned

on

is

the

same

as

for

the

normal

operation.

+

The

speaker

protection

operation

is

also

the

same

as

for

the

normal

operation.

(4)

Automatic

POWER

ON

+

The

POWER

ON

state

is

entered

for

model

discrimina-

tion

whenever

the

power

is

turned

on

while

pressing

the

“LOUDNESS”

key.

All

the

functions

are

then

initialized

and

activated

in

the

all-lighting

mode.

In

the

all-lighting

mode,

the

selector

display

LED

lights

sequentially.

For

KAF-7002/5002,

the

SOURCE

DIRECT

and

CD

DIRECT

display

LEDs

light

alternately.

For

KA-

7090R,

the

SOURCE

DIRECT

display

LED

lights.

The

SP

A

and

B

display

LEDs

do

not

light.

All

other

LEDs

light.

-

The

all-lignhting

mode

is

canceled

when

any

of

the

main

unit’

s

keys

is

pressed.

The

normal

display

obtained

when

the

selector

is

set

to

TUNER

then

appears.

(5)

Special

operation

“LOUDNESS”

key

(a)

When

this

key

is

pressed,

the

LOUDNESS

display

LED

lights

and

the

electric

volume

turns

up

for

16

sec-

onds.

After

16

seconds,

the

electric

volume

stops

and

the

display

LED

goes

off.

(b)

When

this

key

is

pressed

during

operation

or

after

operation

in

step

(a),

the

LOUDNESS

display

LED

lights

and

the

electric

volume

turns

down

for

16

seconds.

After

16

seconds,

the

electric

volume

stops

and

the

display

LED

goes

off.

(c)

When

this

key

is

pressed

during

operation

in

step

(b),

the

LOUDNESS

display

LED

goes

off

and

the

electric

volume

stops.

(d)

The

operation

in

step

(a)

is

carried

out

when

this

key

is

pressed

after

operation

in

step

(c).

After

that,

the

oper-

ation

in

steps

(a)

to

(c)

is

repeated

every

time

this

key

is

pressed.

The

operation

is

not

canceled

even

if

another

key

is

pressed

while

the

electric

volume

turns

up

and

down.

»

“SPEAKER

A+B”

When

the

switch

is

set

to

this

position,

the

SPEAKER

A

+

B

LED

(for

only

the

KA-7090R)

lights

and

the

audio

mut-

ing

is

turned

on.

When

the

switch

is

set

to

another

posi-

tion,

the

LED

goes

off

and

the

audio

muting

is

turned

off.

“MD

MONITOR”

key

(for

only

KAF-7002/5002)

When

this

key

is

pressed,

the

MUTE

display

LED

lights

and

the

audio

muting

is

turned

on.

When

this

key

is

pressed

again,

the

audio

muting

is

turned

off

and

the

dis-

play

LED

goes

off.

-

“ATT.

-30dB”

key

(for

only

KA-7090R)

When

this

key

is

pressed,

the

ATT.

LED

lights

and

the

ATT.

-30dB

is

turned

on

during

normal

operation.

The

REC

muting

is

turned

on

while

the

REC

OUT

mode

is

set

to

ON.

When

this

key

is

pressed

again,

the

ATT.

or

REC

muting

is

canceled

and

the

ATT.

LED

goes

off.

“REC

OUT”

key

(for

only

KA-7090R)

When

this

key

is

pressed,

the

REC

OUT

LED

lights

and

the

REC

OUT

mode

is

set

to

ON.

The

operation

is

not

canceled

until

this

key

is

pressed

again.

The

REC

mut-

ing

is

canceled

if

it

is

on

when

the

operation

is

canceled.

“8/16-bit

selector

switch”

(for

only

KA-7090R)

The

system

enters

the

all-lighting

mode

if

this

switch

is

set

to

the

8-bit

position

when

the

ATT.

key

is

on

after

the

all-lighting

mode

is

canceled.

The

serial

POWER

ON

code

is

output

at

that

time

(code

“25H”

is

output

when

the

test

mode

is

activated

in

the

8-bit

position,

and

code

“0800”

is

output

when

it

is

activated

in

the

16-bit

posi-

tion).

The

all-lighting

mode

is

canceled

when

this

switch

is

set

to

the

16-bit

position

again

or

when

the

ATT.

key

is

pressed.

The

normal

display

then

appears.

5-2.

Serial

Test

Mode

(1)

Setting

the

test

mode

.

The

serial

test

mode

is

entered

if

a

serial

“71H”

code

is

received

only

when

the

KA-7090R

is

in

the

8-bit

mode.

After

that,

only

the

16-bit

mode

is

accepted.

In

other

cases,

the

serial

test

mode

is

entered

when

a

serial

“C27FH”

code

is

received.

(2)

Canceling

the

test

mode

The

serial

test

mode

is

canceled

when

a

“C27FH”

code

is

received.

In

this

case,

the

system

is

not

initial-

ized.

The

serial

code

also

remains

set

to

the

16-bit

posi-

tion.

-

When

the

AC

power

(main

power)

is

turned

off,

the

serial

test

mode

is

canceled

and

the

system

is

initialized.

(3)

Contents

of

test

mode

.

The

serial

code

for

a

test

shown

in

the

attached

list

is

analyzed

for

processing.

In

the

test

mode,

no

mute

signal

is

output

to

shorten

the

input/output

selection

time

during

measurement.

Howev-

er,

the

operation

when

the

power

is

turned

on

is

the

same

as

for

the

normal

operation.

The

speaker

protection

operation

is

also

the

same

as

for

the

normal

operation.-

The

code

input

in

the

test

mode

by

serial

communication

is

validated

irrespective

of

the

dis-

play

mode.

KA-7090R

CIRCUIT

DESCRIPTION

-

The

all-lighting

mode

is

canceled

using

an

all-lighting

cancel

code.

After

cancellation,

the

normal

display

appears.

-

In

the

all-lighting

mode,

the

selector

display

LED

lights

sequentially.

For

KAF-7002/5002,

the

SOURCE

DIRECT

and

CD

DIRECT

display

LEDs

light

alternately.

For

KA-

7090R,

the

SOURCE

DIRECT

LED

lights.

The

SPEAK-

ER

LED

does

not

light.

All

other

LEDs

light.

-

The

REC

OUT

selector

is

operated

by

inputting

the

code

of

the

selector

after

a

REC

MODE

ON

code

is

input

(for

only

KA-7090R).

+

The

main

unit’

s

keys

can

be

pressed

even

in

the

serial

test

mode.

However,

the

operation

is

not

guaranteed

in

this

case.

+

The

operation

when

the

code

having

a

function

not

con-

tained

in

the

corresponding

model

is

input

is

not

guaran-

teed.

+

The

REC

muting

is

canceled

by

MUTE

ALL

OFF.

KA-7090R

CIRCUIT

DESCRIPTION

6.

Microprocessor

periphery

block

diagram

(K's

KAF-7002,5002)

(KA-7090R)

POWER

ON

x

1

AUDIO

MUTE

x

1

HEAD

PHONE

x

1

—

SERIAL

x2

DATA,

BUSY

r-

MOTORVOL

x2

UP/DOWN

L

AD

x3

KEY

INPUT

SP

SW

INPUT

(ROTARY

SW)

INPUT INPUT

(ROTARY

SW)

SELECTORIC

x3

(K's)

DATA,

CLOCK,

BUSY

TC9162

(FUNCTION

SW)

TC9164

(REC

OUT

SW)

SELECTOR

IC

x

5

(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

x6

REC

OUT

LED

x

1

A.T.T.

LED

x1

ON/STANDBY

LED

x

1

LOUDNESS

LED

x

1

S.

DIRECT

LED

x

1

SP

RELAY

x

2

(KA-7090R)

LED

DISPLAY

x

14

SELECTOR

LED

x

6

MD/MONITOR

LED

x

1

MUTE

LED

x

1

ON/STANDBY

LED

x

1

LOUDNESS

LED

x

1

DIRECT

LED

x

2

SP

RELAY

x

2

(K's)

(K's

KAF-7002,5002)

DIRECT

ENCODER

x2

REMOCON

x1

PROTECTION

x1

RESET

x1

CE

x1

=

ee)

sl

dS

<I

feat

=

cS

i]

)

Oi

D

“a

DESTINATION

x2

COMPO/K's

DISCRIMINATION

8/16

bit

CHANGE

OVER(KA-7090R)

DESTINATION

x2

COMPOKK's

DISCRIMINATION

KAF-7002/5002

DISCRIMINATION

(K's)

KA-7090R

CIRCUIT

DESCRIPTION

6-1.

Microprocessor

connection

‘awn

AWS

ye

S19}9}

“ALUI}

BES

Je

S18}}9|

DOA

ON

go

LaSay

NOILOALOYd

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(g)4SGOONS

HIG

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HIG

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ads

vds

yId

‘GO

Bunyby

wo

wqiyul

yiq

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wor

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dv

lyodaa

[|_|

OA

SSA

ON

_

LNOX

LNOx

go

—_

NIX

1asay

>

4auA

4ayA

NOILOALOWd

=——>

@,

NOOOWSH

=

——>

QM

ON

—P

Le

ON

—_

©

9)

it)

|

(LIZenrnyaLs

|

Ss

dN

10A

HOLOW

dN

10A

HOLOW

yid

‘3OuNOS

as

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10A

HOLLOW

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SSANGNO1

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Viva

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viva

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adv

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GvaH

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SLAW

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olan

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08:

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934

YANNL

(LLZENPN)Y1O

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wOCOLYS

Sid

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KA-7090R

)

CIRCUIT

DESCRIPTION

)

16bit

serial

test

code

(C2XXH)

TYPE

FUNC

0

1

2

E

F

:Sendingcode

|}:

6-2.

connection

NAME

KA-7090R

CIRCUIT

DESCRIPTION

DESTINATION

14

COMPOKK's

DISCRIMINATION

PORT

POWER

ON

POWER

RELAY

CONTROL

TERMINAL

COMPO

CLR

xIyjrc\|r

CONTROL

IC(NJU3711)CLR

SIGNAL

OUTPUT

TERMINAL(KA-7090R)

NOT

USED

Ti

rly

K's

MD

MONITOR

“REC OUT"

LED

CONTROL

TERMINAL

(KA7090R)

"MD

MONITOR"

LED

CONTROL

TERMINAL

MUTING-30

COMPO

“AeTeT"

LED

RELAY

CONTROL

TERMINAL

(KA-7090R)

K's

"A

MUTE”

LED

TERMINAL

AUDIO

MUTE

"MUTING"

SIGNAL

OUTPUT

TERMINAL

HEAD

PHONES

ps ee

Oe

HEAD

PHONES

CONTROL

TERMINAL

CTlrcjir

S

DATA

SERIAL

DATA

S

BUSY

SERIAL

BUSY

V

DOWN

VOLUME

DOWN

SIGNAL

OUTPUT

TERMINAL

Vv

UP

VOLUME

UP

SIGNAL

OUTPUT

TERMINAL

KEY

(TACT)

|

KEY

INPUT

TERMINAL

5

KEYS

(KA-7090R)

KEY

INPUT

TERMINAL

5

KEYS

(K's)

SPEAKER

SEL

"

SPEAKER

SELECTOR

“

INPUT

TERMINAL

SEL

IC

DATA

SELECTOR

IC

DATA

SEL

IC

CLOCK

SELECTOR

IC

CLOCK

SEL

IC

ST

SELECTOR

IC

STROBE

INPUT

SEL

V

REF

INPUT

SELECTOR

SW

INPUT/CONTROL

TERMINAL

A/D

REFERENCE

VOLTAGE

X

IN

OSCILLATOR

(8MHz)

X

OUT

OSCILLATOR

(8MHz)

VSS

GND

VCC

+5V

NOT

USED

MICROPROCESSOR

CHIP

ENABLE

:

ENABLE

RESET

SIGNAL

INPUT

TERMINAL

PROTECTION

DETECTION

REMOCON

IN

REMOTE

CONTROL

INPUT

TERMINAL

SOURCE.DIR

B

;

COMPO

—

NOT

USED

K's

ROTARY

ENCODER

B

SIGNAL

INPUT

TERMINAL

SOURCE.DIR

A

COMPO

—

NOT

USED

K's

ROTARY

ENCODER

A

SIGNAL

INPUT

TERMINAL

SP

B

SPEAKER

RELAY

B

CONTROL

TERMINAL

SPEAKER

RELAY

A

CONTROL

TERMINAL

lou

Renke)

COMPO(NJU3711)CONTROL

ST

SIGNAL

OUTPUT

TERMINAL

(KA-7090R)

K's

"CD.DIR"LED

CONTROL

TERMINAL

Tr

|

T|

er

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

"MD"

LED/RELAY

CONTROL

TERMINAL

cD

"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

rc

Kenwood KA-7090R User manual

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