Kenwood KR-4140 User manual

KENWOOD

HI/Fl

STEREO

COMPONENTS

SERVICE

MANUAL

KR-4140

SOLID

STATE

AM-FM

STEREO

RECEIVER

PARTS

DESCRIPTION

LIST

MAIN

CHASSIS

(AEOK)

SECTION

PC

BOARD

RF

UNIT

(UA1125K)

1F

UNIT

(UA1224K)

MPX

UNIT

(75S)

PRE,

TONE

&

MAIN

(UA6001J3)

X01-0025-10

X02-0020-10

X04-0010-10

X09-0013-03

Symbol

No.

Description

Part

No.

Remarks

CAPACITOR

Ci

C101

C111

C112

C113

C114

C171

C201

C211

C212

C213

C214

C301

C302,

303

C304

C305

C306

Electrolytic

Tubular

Mylar

Electrolytic

Block

Mylar

Mytar

Mylar

Oil

tmpregnated

Oil

tmpregnated

Electrolytic

Block

Electrolytic

Tubular

Electrolytic

Tubular

100uF

0.027

uF

0.0015uF

0.068uF

0.018uF

0.0056uF

2200uF

0.027pF

0.0015uF

0.068uF

0.01

8uF

0.0056uF

0.01

uF

0.02uF

2200uF

470uF

100uF

3.15WV

+20%

35WV

+20%

+100%,

+20%

5OWV

35WV

16WV

CEO4WOF

101

CQ92M1H273M

CQ92M1H152M

CQ92M1H683M

£092M1H183M

CQ92M1H562M

CE62AW1V222

CQ92M1H273M

CQ92M1H152M

CQ92M1H683M

CQ92M1H183M

CQ92M1H562M

CP052W103P

CP02B2J203M

CE62AW1H222

CEO2W1V471

CEO2W1C101

RESISTOR

R1

R101

R102

R111,

112

R113

R114

R171

R172

R173

R201

R202

R211,

212

R213

R214

R271

R272

R273

R301

R302

R303

R304

R305

R306

R307,

308

R309

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Fitm

Insulated

Carbon

Film

Fixed

Carbon

Composition

Fixed

Carbon

Composition

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Fixed

Carbon

Composition

Fixed

Carbon

Composition

Fixed

Carbon

Composition

Fixed

Carbon

Composition

Insulated

Carbon

Film

Insulated

Carbon

Film

Insulated

Carbon

Film

Meta!

Film

Fixed

Carbon

Composition

Fixed

Carbon

Composition

Fixed

Carbon

Composition

+10%

£10%

+10%

£10%

+10%

10%

£10%

+10%

+£10%

£10%

+10%

+5%

15%

+5%

+10%

10%

+10%

PD14BY

2E561K

PD14BY

2E

104K

PD14BY

2E394K

PD14BY

2E

103K

PD14BY

2E472K

PD14BY

2E273J

RCOSGF 2H102K

RCO5GF

2H331K

PD14BY

2E

102K

PD14BY

2E

104K

PD14BY

2E394K

PD14BY

2E

103K

PD14BY

2E472K.

PD

14BY

2E273J

RCO5GF

2H102K

RCO5GF

2H331K

RCOS5GF

2H560K

RCOSGF

2H

102K

RW14AG3S1515

RW14AG3G561J

RW14AG3S681J

RN14AB3D

102J

RCOSGF

2H152K

RCO5GF

2H220K

RCOS5GF

2H

222K

PARTS

DESCRIPTION

LIST

Symbol

No.

Description

VOLUME

=_

(50k2.B)

Dual

BALANCE

(100kQW)

Slide

BASS

(50k2A)

Dual

TREBLE

(50kQA)

Dual

POTENTIOMETER

a

RO6-4005-05

R13-4005-05

RO8-4042-05

RO08-4042-05

TRANSISTOR/DIODE/THERMISTOR

~

2SD155

28D234

$1802-03B

18338T

5T-31

SWITCH

SELECTOR

(Rotary)

F°4:14-4

MODE

(Rotary)

F°2°4°5

LOUDNESS

(FIVE

Pushbutton)

TAPE

MONITOR

(FIVE

Pushbutton)

MUTING

(FIVE

Pushbutton)

'

LOW

FILTER

(FIVE

Pushbutton)

HIGH

FILTER

(FIVE

Pushbutton)

SPEAKERS

(Rotary)

F°1°4-4

PRE-MAIN

SEPARATE

SW

(Slide)

Chassis

Frame

Panel

Sub-Panel

Reflector

(A)

Sole

Plate

Thermistor

Holder

x

2

Antenna

Holder

Meter

Holder

Ring

Name

Plate

(for

Antenna)

Front

Glass

Filter

Decorated

Panel

Dial

Diat

Pointer

Pilot

Lamp

(Fuse

Type)

x

4

Pilot

Lamp

Meter

Certification

Decorated

Panei

Schematic

Diagram

Flywheel

Dial

Spring

Small

Pulley

x

2

Smali

Bushing

x

4

Small

Bushing

x

4

Dial

Metal

Fittings

Pulley

$04-4012-05

$04-2037-05

$41-5001-05

$04-1024-05

$10-22D

A10-0210-01

A15-0002-04

A20-0326-05

A23-0076-02

A33-0009-03

A40-0058-03

A90-310B

A5065

A5107B

BO7-0064-04

B09-190

B10-0033-02

B19-0087-03

B42-0225-02

B20-0160-03

B21-4001-05

B30-0015-15

B30-0033-03

B31-0006-05

B42-0009-04

B42-0225-03

B52-0076-00

DO5-52B

D06-02

DO9-14B

D10-05

D10-09

D11-13

D15-0058-04

PARTS

DESCRIPTION

LIST

Symbol

No.

Description

Part

No.

Remarks

Dial

Shaft

Jack

(1P)

Jack

(4P)

Jack

(6P)

AC

Outlet

x

2

PHONE

Jack

with

DIN

Connector

(4P)

Pilot

Lamp

Socket

MIC

Jack

x

2

Transistor

Socket

x

4

Radiator

Felt

with

Sticker

Dust

Sheet

Shield

Plate

(for

Radiator)

Insulating

Plate

(for

Power

SW)

Rubber

Bushing

Legs

x

4

Cord

Bushing

AC

Cord

Bushing

Corrugated

Cardboard

Case

Warranty

Card

Fuse

Holder

x

4

Front

Glass

Holder

x

2

Front

Glass

Holder

x

3

Meter

Holder

Dial

Holder

Meter

Holder

Front

Glass

Holder

x

2

Switch

Holder

P.

C.

Board

P.

C.

Board

Knob

(TUNING)

Knob

(SPEAKERS,

BASS,

TREBLE,

MODE,

SELECTOR,

VOLUME)

Knob

(BALANCE)

Power

Transformer

FM

Antenna

Ferrite

Loopstick

Antenna

Chocke

Coil

Fuse

Holder

Feeder

Holder

Switch

Stopper

Slider

AC

Cord

with

Plug

In

USA

added

to

the

parts

of

(K),

In

PX

added

to

the

parts

of

(U)

Case

(K)

Rear

Panel

(K)

Rear

Panel

(U)}

Amp

Holder

x

2

(K)

Holey

Plate

(U)

Caution

Sticker

;

(U)

D20-0079-03

E08-11C

E08-14G

E08-16D

E08-0205-05

E11-0002-05

E13-0401-05

E15-0033-05

E16-22

E4086

F01-0001-13

F15-0008-04

F15-0054-04

F10-0185-03

F20-0027-04

G02-020

G10-02

G11-19

G11-25

H01-0507-03

H26-02

J13-0023-05

J19-0029-14

J19-0062-04

J19-0063-03

J19-0064-04

J19-0065-03

J19-0091-04

J21-0703-04

J25-0062-04

J25-0063-04

K23-0047-03

K23-0049-03

K23-005

1-04

LO3-0006-05

L10-04

L15-39

L20-010

$15-13

$21-29

$4103

$4132

WO09-15

A01-0124-02

A23-0165-02

A23-0167-02

A3882

BO4-0017-14

BO9-192

Symbol

No.

Description

Part

No.

Remarks

Caution

Sticker

(K)

Caution

Sticker

(K)

Caution

Sticker

(K)

Instruction

Manual

(K)

Instruction

Manual

(U)

Caution

Card

(U)

Plug

x

4

(U)

Fuse

(2A)

(K)

Dial

Cover

(U)

Insulating

Plate

(K)

Insulating

Plate

(K)

Corrugated

Cardboard

Case

(K)

Warranty

Card

(U)

Caution

Card

(for

Case)

(K)

Address

(U)

Caution

Card

(for

AC

VOLTAGE

SELECT)

Switch

Stopper

(U)

Decorated

Screw

x

4

(K)

Decorated

Screw

x

4

(U)

Fuse

(2A)

(U)

AC

VOLTAGE

SELECT

(U)

Power

SW

(Pushbutton)

(U)

Power

SW

(Pushbutton)

(K)

B42-0046-04

B42-0219-04

B42-0220-04

B50-0480-00

B50-0481-00

B58-0003-00

E09-410

FO5-2021-05

F07-0171-03

F20-0023-03

F20-0030-03

H02-01

10-03

H26-17

H4068

H4156

H4190

4J19-0082-04

NO8-0003-04

NO8-0005-04

$17-02

$31-2004-05

$39-1010-05

$39-1011-05

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SYMPTOMS:

A.

When

there

is

load

hum

at

the

speakers.

B.

When

there

is

no

output

at

all.

C.

When

you

cannot

get

rated

output.

REPLACING

METHOD:

Replace

all

the

four

transistors,

2SD155.

TESTING

PROCEDURES:

Until

replacement

is

completed,

do

not

operate

the

unit

without

first

testing.

Perform

the

test

according

to

the

following

procedures.

1.

Using

variable

transformer,

lower

the

AC

line

voltage

to

approximately

30

V.

2.

Also

measure

the

voltage

between

the

chassis

and

Collector

of

the

power

transistor

Q2

or

Q3.

If

a

tester

indicates

approximately

25

V,

it

is

normal.

3.

Using

a

tester,

measure

the

voltage

between

the

chassis

and

Collector

of

the

power

transistor

Q1

or

Q4.

Ifa

pwdicales

AO

SOV,

it

is

PROTECTION

ADJUSTMENT

PROCEDURES:

The

protection

circuit

in

“UA6001J3”

is

a

non-adjustment

circuit.

But,

check

the

circuit

for

normal

operation

as

follows

for

cautipns

sake;

With

a

8

ohms

dummy

load

and

an

oscilloscope

connected

in

parallel

to

the

output

terminal,

place

the

controls

on

“KR-4140”

in

their

normal

positions.

Apply

a

signal

of

1,000

Hz

to

the

input

and

adjustment

the

volume

control

until

“UA6001J3”

provides

an

output

of

10

W

as

measured

across

the

dummy

load.

Try

to

short

across

the

dummy

and

then

restore

it

to

the

normal

connection

under

the

above

conditions

and

check

to

see

that

the

scope

sweeps

with

no

waveform

once

and

then

with

the

waveform

represented,

thereby

showing

that

the

protection

circuit

is

operated

normally.

If

the

protection

circuit

fails

to

operate,

turn

off

the

power

switch

immedi-

ately,

otherwise

the

final

stage

transistors

may

be

damaged.

And

then

check

transistors,

Qe17

~

19

and

Diodes,

De5,

6

whether

they

are

good

or

not.

BOTTOM

VIEW

OF

TRANSISTOR

Von

2SD155

Normal.

——

Bo

°

66

°

CASE

COLLECTOR

a3

a4

a2

a1

LEFT

RIGHT

CHANNEL

25V

-50V

25V

50V

COLLECTOR

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ALIGNMENT

PROCEDURE

sts

Instruments:

Warm-up:

Selector

SW:

Alignment

tool:

Dummy

Antenna

TUNER

SECTION

FM

ALIGNMENT PROCEDURE

FM

SG,

AC

VTVM

&

Oscilloscope

Allow

30

minutes

warm-up

period

for

receiver

and

equipments

Always

place

in

FM

AUTO

position

FM

SSG

Coupling

|

Input

Signal

NATOR

RF

AMP

CIRCUIT

RF

AMP

CIRCUIT

Direct

High

side

to

(A)

Low

side

to

Chassis

10.7

MHz

(Unmod.)

Tuning

Dial

Setting

Output

Indicator

Adjust

IF

transformers

require

a

plastic

screwdriver-type

alignment

tool.

Remarks

Any

non-

interfering

setting

300

ohm

Carbon

Resistor

DISCRIMI-

300

ohm

Carbon

Resistor

300

ohm

Carbon

Resistor

FM

400

Hz

(Mod.)

Antenna

75

kHz

(Dev.)

Terminal

0.5~1mVv

(Input)

90

MHz

FM

400

Hz

(Mod.)

Antenna

75

kHz

(Dev.)

Terminal

1.5

~2uV

(Input)

98

MHz

+

une

for

maximum

using

tuning

indicator

90

MHz

Tuning

Indicator

VTVM

at

LEFT

output

jack

of

TAPE

REC

VTVM

&

X-tal

earphone

at

jack

of

TAPE

REC

106

MHz:°

FM

400

Hz

(Mod.)

Antenna

75

kHz

(Dev.)

Terminal

1.5~2yuV

(Input)

Repeat

steps

3

&

4

until

n

106

MHz

VTVM

&

X-tal

earphone

at

LEFT

output

jack

of

TAPE

REC

(UA1125K)

Tal

(UA1224K)

Lb2,

3,

5

Top

&

Buttom

(UA1224K)

Lb8

Top

&

Bottom

(UA1125K)

Lal

~La4

(UA1125K)

CTal

~CTa5

Maximum

Deflec-

tion

Maximum

Deflec-

tion

Maximum

Deflec-

tion

Maximum

Deflec-

tion

further

improvement

is

possible.

OUTPUT

LEVEL

300

ohm

Carbon

Resistor

98

MHz

400

Hz

(Mod.)

75

kHz

(Dev.)

1m

V

(Input)

FM

Antenna

Terminal

Tune

for

maximum

using

tuning

indicator

VTVM

&

X-tal

earphone

at

LEFT

output

jack

of

TAPE

REC

(UA1224K)

VRb1

Set

the

output

level

to

1V

1.

Instruments:

2.

Selector

SW:

3.

Warm-up:

Audio

Signal

Generator

Coupling

FM

MPX

ALIGNMENT

PROCEDURE

(a)

SCA

FILTER

Audio

SG,

AC

VTVM

&

Oscilloscope

Always

place

in

FM

AUTO

position

ALIGNMENT

PROCEDURE

Allow

30

minutes

warm-up

period

for

Receiver

and

equipments

Audio

Signal

Generator

Frequency

AC

VTVM

&

Oscillo-

scope

Coupling

High

side

to

(B)

Low

side

to

chassis

1.

Instruments:

2.

Selector

SW:

3.

Warm-up:

FM

SSG

Modulation

engin

Frequency

67

kHz

(0.5

V)

High

side

to

(C)

Remarks

(X04-0010-10)

Low

side

to

chassis

Le3

(b)

MPX

FM

SG,

Audio

SG,

AC

VITVM

&

Oscilloscope

Always

place

in

FM

AUTO

position

Minimum

Deflection

Allow

30

minutes

warm-up

period

for

Receiver

and

equipments

(Field

Strength:

19

kHz

Carrier

Teapot

Switch

Selector

VTVM

&

Oscilloscope

Connection

Adjust

FM

Antenna

Terminal

GPP

OFF

High

side

to

(C)

Low

side

to

chassis

1000uV

at

Antenna

Terminal)

Remarks

(X04-0010-10)

Lcl1,

Lc4

FM

Antenna

Terminal

OFF

or

400

Hz

A+Bor

REVERSE

OFF

To

distant

of

Antenna

Terminal

A

PHASE

REVERSE

LEFT

or

RIGHT

output

jack

of

TAPE

REC

FM

Antenna

Terminal

Aor

LEFT

(X04-0010-10)

VRcl

Maximum

Deflec-

tion

Beacon

Lamp

“ON”

(X04-0010-10)

Lce4

To

obtain

a

wave

form

with

maxi-

mum

amplitude

at

400

Hz

on

oscilloscope

RIGHT

output

METER

SETTING

300

ohm

Carbon

Resistor

98

MHz

400

Hz

(Mod.)

75

kHz

(Dev.)

1

mV

(Input)

FM

Antenna

Terminal

Tune

for

maximum

deflection

VTVM

&

X-tal

ear-

phone

at

LEFT

out-

put

jack

of

TAPE

REC

Tuning

Indicator

(UA1224K)

Lb7

VRb2

64?

indicator

FM

Antenna

Terminal

B

or

RIGHT

LEFT

output

—___

Repeat

steps

4

&

5

until

no

further

improvement

is

possible.

(UA6001J3)

VRd1

Minimum

Deflec-

tion

(UA6001J3)

VRd1

Minimum

Deflec-

tion

Kenwood KR-4140 User manual

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