Kenwood KAC-887 User manual

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eeeinetnenemeentensnantretnhbanbeninventoutnersienmemeroeninntem

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ict

31-4010-0

Slide

MAIN

AMPLIFIER

xe)

90-05

AOR

rEX.

socket

head

bolt

)

—O

cord

0620

Heat

Spea

E30

Spea

E30

(

Speaker

cord

(E30-0622-05

apes

amet

ive)

{

DISASSEMBLY

FOR

REPAIR

DISASSEMBLY

Remove

the

metallic

cabinet

and

bottom

plate

enable

replacement

resistors,

capacitors

and

transistors.

Remove

the

lead

holder

and

rear

panel

before

replacing

ICs.

not

always

necessary

remove

the

lead

holder

and

rear

panel,

flexible

screwdriver

available.

)

both

ICs

one

heat

sink

block

are

defective,

unsolder

all

the

pins

and

remove

the

screws

holding

the

heat

sink

the

board.

(2)

Pull

out

the

ICs

and

the

heat

sink

from

the

board

and

replace

them

with

new

ones.

one

the

ICs

heat

sink

block

defective,

remove

the

black

heat

sink.

©)

Heat

sink

Black

heat

sink

O®

Remove

screws

holding

the

small

heat

sink

the

board.

Incline

the

heat

sink

the

direction

indicated

the

arrow

(5),

remove

the

screws

holding

the

heat

sink

and

replace

it.

Unsolder

the

terminals

replace

the

capacitor

assembly

the

choke

coil.

Capacitor

Ass’y

Lila

DISASSEMBLY

FOR

REPAIR

CIRCUIT

DESCRIPTION

CHECKING

PROCEDURE

Connect

the

GND

pattern

the

input

circuit

and

the

body

sensitivity

switch

that

the

output

circuit

the

chassis

the

capacitor

assembly,

then

connect

terminal

the

DIN

cord

the

power

source

before

checking

voltages.

CAPACITOR

ASS'Y

(

GND

Fig.

CIRCUIT

DESCRIPTION

Power

ON/OFF

circuit

power

switch

provided

the

exterior

the

KAC-887.

Instead,

relay

and

transistors

(Q5

and

Q6)

are

used

turn

the

power

and

OFF.

The

voltage

supplied

through

ter-

minal

the

DIN

cord

used

control

and

Q6.

When

voltage

supplied,

and

are

turned

actuate

the

RED

)

csp

)

Soy

D3)

eee

2B:

Sees!

Ppa

(

BATTERY

13.8V

relay

that

the

power

fed

the

power

dlifier

circuit.

When

turned

OFF,

the

relay

releases

the

power

amplifier

turned

OFF.

CIRCUIT

DESCRIPTION

pPC

1230H

This

designed

that

the

and

speaker

are

protected

against

shorts

which

may

occur

between

the

output

terminal

and

ground

when

the

used

the

BTL-OCL

connection.

NON-INVERTING

INPUT

(12)

GND

(OUTPUT)

(8)

RIPPLE

FILTER

(0)

BOOT

STRAP

(1)

OUTPUT

[om

ee)

(7)

GND

(INPUT)

.o)

THERMAL

PROTECTOR

SURGE

aia

—

Bee

| |

Q3!

Fig.

SCHEMATIC

pPC

1230H

INTERNAL

‘5

CIRCUIT

DESCRIPTION

;

ISOLATION

AMPLIFIER

R21

INPUT

Ol,

Sl,

LLL

INPUT

CIRCUIT

GND

O+B

OUTPUT

CIRCUIT

GND

Fig.

ISOLATION

AMPLIFIER

Each

car

audio

component

generally

grounded

appropriate

point

the

car

body.

Therefore,

equipment

connected

the

power

amplifier

may

have

grounding

point

different

from

that

the

power

amplifier.

there

potential

difference

between

the

grounding

points,

will

reproduc-

noise

the

speakers.

the

KAC-887,

the

input

Circuit

ground

isolated

from

that

the

power

amplifier

cir-

cuit

using

isolation

amplifier

that

noise

reduced.

Transistors

and

Figure

operate

inverting

amplifier

and

ripple

filter,

respectively,

when

there

potential

difference

between

the

ground

the

input

circuit

and

that

the

power

amplifier

®).

This

because

the

circuit

equivalent

the

circuit

which

and

®)are

connected.

Assume

that

noise

source,

connected

between

and

(8)

shown

Figure

The

impedance

C63

negligible

when

signal

dealt

with;

therefore,

applied

the

base

with

its

phase

and

amplitude

unchanged

and

added

the

voltage

(V-)

the

emitter

Q7.

Thus,

the

base

voltage

given

R21

(Vet+En)

+R1

7Ey

R21V¢_

R21+R17..——~SO

RTD

voltage

Noise

This

indicates

that

applied

the

base

Q1.

the

other

hand,

applied

the

connection

between

R25

and

R29

since

the

impedance

negligible.

Therefore.

the

voltage

level

both

the

base

and

emitter

vary

according

and

there

change

potential

difference

betweer

the

two.

Thus,

not

output

from

the

collector

Q1.

R21

Fig.

BOARD

POWER

AMPLIFIER

(X07-1920-10)

Foil

side

view

Note:

19)

ev)

®)

{

Refer

the

schematic

diagram

for

the

values

resistors

and

capacitors.

The

board

drawing

viewed

from

the

side

easy

check.

‘wena?

MAIN

AMPLIFIER

aRRcrerIa

CAUTION

This

amplifier

uses

the

BTL

connected

circuit

mentioned

before,

make

sure

the

following.

Since

the

ground

line

the

amplifier

floated,

when

connecting

the

measuring

instruments

(oscilloscope,

VIVM,

distortion

meter,

load

resistors

etc.),

make

sure

use

the

”

QKENWOOD'

DB)

floated

GND

terminals.

When

their

grounds

are

connected

the

ground

terminals

the

power

supply,

oscillator,

etc.,

the

output

(X07

=I9

ak)

—_————

eee

the

zPC

1230H

will

short-circuited

and

may

damaged.

[

—“

REAR

aan

BLK

aro

GND

HIGH

LOW

—

R10

33K

R'I8

33K

CAPACITOR

ASS’Y

‘ie

;

BLU

I3V

1.3V

OV.

13.6V

13.8V

128.

€7V.

[

Tmt

seat

GRY

=D)

REAR

OUTPUT

Rch

GRY

(CTD

(-)

ook

MOLD

(-)

Rech

ORG

’

FRONT

OUTPUT

GRY

GRN

Ri2

33K

Prt

RED

;

OOO

Lif

(+13.8Vv)

ree

IOA

820P

Hi00

I6v

UPCI230H

2SA1175(H,F,E,

28C2785

(H,

F,E,

INPUT

25C1735(0,E)

UO5B

WO6B

1$1555

IS2076

KAC

—

887(k)

2801735

2SA1175

BPO

t230h

Bees

voltages

are

measured

VOM

with

kQ/V

input

impedance.

2$SC2785

Fea.

SPECIFICATIONS

Total

Output

Power

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

Power

per

Channel...............

into

Input

Sensitivity

20~

30,000

Hz,

THD

Total

Harmonic

Distortion

......

0.05%

(at

kHz,

watts)

Frequency

Response

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

20~

50,000

(+3

dB)

Signal

Noise

Ratio.............

(A-weighted)

Sire

ihe

See

ete

mV/110

Output

Input

Impedance..................

kQ/5

Load

Impedance

Power

Source

Bice

Saitek

1.3

(2.9

Ib)

Semiconductor

Substitutions

2SA1175

2SA733,

2SA999

2S5C2003

2SC945,

2$C2320

«=

28C1735

2SC2785

een

eee

(4~8

Allowable)

ees

Fete

Fiat

yet

14.4

(11~16

Allowable)

outa,

142x53x158

‘

ESD

RPO

CRO

KAG-887

EXPLODED

VIEW

M2.6

(F)

BLK

M2.6x6

(F)

BLK

‘

(Br-Tap)

M3x6

(8r-Tap)

(Br-Tap)

:(Br-Tap

)

(Br-Tap)

M3xl2

BLK

N30-30t2-

M2.6x6

(m—

(Br

-Tap)

M3x6

(Br-Tap)

BLK

N87-3006-45

M3x6

(8r-

Tap)

N8&7-3006-46

M3x

10(B8r-Tap)

N87-3010-46

M2.6x6(F-Tap)BLK

N88-2606-45

KAC-887

KAG-887

New

parts.

Parts

without

Parts

No.

are

not

supplied.

Les

articles

non

mentionnés

dans

Parts

No.

sont

pas

fournis.

Teile

ohne

Parts

No.

werden

nicht

geliefert.

Ref.

No.

Parts

No.

Bat

KAC-887

Description

BOTTOM

PLATE

BLIND

SHEET

HOLDER

A01-0411-03

A23=-1941-04

METALLIC

CABINET

REAR

PANEL

B46-0055=30

B46-0063-13

B46-0063=13

846-0070=-03

B46-0070=03

WARRANTY

CARD

WARRANTY

CARD

WARRANTY

CARD

WARRANTY

CARO

WARRANTY

CARD

B46-0070-03

B46-0077-04

B50-3386-00

B50-3387-00

WARRANTY

CARD

WARRANTY

CARD

INSTRUCTION

MANUAL

INSTRUCTION

MANUAL

INSTRUCTION

MANUAL

B50-3387-00

850-3387=00

B50=-3387-00

INSTRUCTION

MANUAL

INSTRUCTION

MANUAL

INSTRUCTION

MANUAL

C91-0195-05

CAPACITOR

ASSY

E30-0619-05

E30-0620-05

E30-0621-05

E30-0622-05

SPEAKER

CORD

(BLU/GRY)

SPEAKER

CORD

(RED/GRY)

SPEAKER

CORD

(GRN/GRY)

SPEAKER

CORD

(ORG/GRY)

GND

CORD

E30-0633-45

E30-0686=05

DIN

CODE

F01=-0383=03

F01-0384=03

F95-1031-05

HEAT

SINK

(CL)

HEAT

SINK

(CR)

FUSE

250V

10A

H01#3309=-04

H10-1584-02

H12-0084=08

H25-0029=04

H25-0067=03

CARTON

BOX

POLYSTYRENE

FIXTURE

PACKING

FIXTURE

BAG

H25-0112-04

H25=0173=04

BAG

J2123029=04

MOUNTING

HAROWARE

N99-0054205

N09=0390=05

SCREW

NUT

SET

HEX.SOCKET

HEAD

BOLT

X07=1920-10

POWER

AMP

PCB

ASSY

POWER

AMP

(X07-1920-10)

C24=21410-61

ELECTRO

10uUF

25wy

C24-1247-61

ELECTRO

47UF

16WV

C24"1722°59

ELECTRO

2,2UF

SOWV

C5221782-16

CERAMIC

820PF

C2401010"79

ELECTRO

100UF

10wWwV

C24+1210"79

ELECTRO

100UF

16WV

C24=1233=71

ELECTRO

330UF

16WV

C45-1710946

MYLAR

O.1UF

C25=-1710"57

|ELECTRO

1UF

SOwV

C24=21047-69

ELECTRO

47UF

10WV

C2401247"71

ELECTRO

470UF

16WV

C90"0564"05

ELECTRO

15000UF

16WV

C25-171075S7

ELECTRO

1UF

SOWV

C2421247-61

ELECTRO

47uUF

16WV

C45-1722-26

MYLAR

0.0022UF

U.S.A.

Canada

AAFES

Europe

Other

area

Audio

club

=X:

Australia

PARTS

LIST

Parts

No.

Description

ASR

C71-1727-06

CERAMIC

27PF

L15=0023-05

CHOKE

COIL

$51-1032-05

RELAY

;

$31-4010-05

SLIDE

SWITCH

V11=0270-05

U05B

V11-0295-05

wO6B

V11-0271-05

1§2076

181555

V30-0620-10

UPC1230H

V01=1175-30

2SA117S5

(Hp

FZE,K)

VO03—-2785-20

2502785

(H,F,E)

V03=0452-05

25¢1735(D-E)

V03=2785-20

25C2785(H,FeE)

V01-1175-30

28A1175(HDF,E,K)

Raa

product

TRIO-KENWOOD

CORPORATION

Shionogi

Shibuya

Building,

17-5,

2-chome

Shibuya,

Shibuya-ku,

Tokyo

150

Japan

KENWOOD

ELECTRONICS,

INC.

1315

Watsoncenter

Rd.

Carson,

California

90745,

U.S.A.

Seaview

Drive,

Secaucus,

New

Jersey

07094,

U.S.A.

1098

North

Tower

Lane,

Bensenville,

Illinois

60106,

U.S.A.

TRIO-KENWOOD

CANADA

INC.

1070

Jayson

Court

Mississauga,

Ontario

Canada

L4W

2V5

TRIO-KENWOOD

ELECTRONICS,

N.V.

Leuvensesteenweg

504,

B-1930

Zaventem,

Belgium

TRIO-KENWOOD

ELECTRONICS,

GmbH

Rudolf-Braas-Str.

20,

6056

Heusenstamm,

West

Germany

TRIO-KENWOOD

FRANCE

S.A.

Boulevard

Ney,

75018

Paris,

France

TRIO-KENWOOD

SVENSKA

Kemistvagen

10A,

183-21

Taby,

Sweden

TRIO-KENWOOD

Unterboesch

6331

Huenenberg/ZUG

Switzerland

TRIO-KENWOOD

(AUSTRALIA)

PTY.

LTD.

Whiting

St.,

Artarmon,

N.S.W.

2064,

Australia

KENWOOD

LEE

ELECTRONICS,

LTD.

Wang

Kee

Building,

5th

Floor,

34-37,

Connaught

Road

Central,

Hong

Kong

1981-5

PRINTED

JAPAN

B51-1213-00

(T)

2313

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