Bang & Olufsen BEOGRAM 4002 Manual de usuario

wes

VeeL

ESET

C471

OL,

YPE

5523-5526

EOGRAM

4002-4004

Bang

Olutsen

O-1

INTRODUCTION

This

service

manual

comprises

Beogram

4002,

type

5513,

which

have

been

constructed

the

basis

type

5503.

the

diagrams

the

components

are

provided

with

individual

position

number

and

co-ordinate

designation,

e.g.

B3.

This

designation

refers

the

placing

the

boards

which

are

provided

with

printed

division

into

fields

and

with

letters

and

figures

along

the

edge

the

board.

Therefore

there

are

drawings

the

boards

the-service

manual.

The

diagram

for

the

CD-4

demodulator

shows

only

one

the

stereo

channels

and

the

co-ordinate

designation

for

right

channel

bracketed,

e.g.

(C2).

The

diagrams,

which

may

unfolded,

are

placed

the

back

the

manual

that

possible

cpen

the

preceding

pages

the

same

time.

The

service

manual

complete

and

contains

the

paragraphs

mentioned

the

below

table

contents.

Supplementary

sheets

will

only

made

case

essential

changes.

CONTENTS

;

SEC.

Technical

data

Disassembly

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

eae

tana

ene

Electrical

description...

2.0.0.0

0002.

esc

eee

nes

eeees

Mechanical

adjustments

Lubrication

chart

ween

ewer

ace

eters

Electrical

adj

justmen?

setae

eee

ete

een

eee

Fault-finding

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

See

cece

eer

euseces

Lene

eeaae

wee

Mechanical

parts

fist

0.0.0.0...

eeepc

eee

cece

eens

Diagram

Electrical

parts

list

Conditions

measurement

.....

Service

tips

cece

cate

eeeeusaceecvnere

1-1

Bang

Oluisen

BEQGRAM

4002

TECHNICAL

DATA

;

Type

Ne.

$513

Sound

system

Stereo,

matrix

Output

0.6m

Speeds

;

33-45

rpm.

Tonearm

Fangential

Autaimatic

racard-size

Yes

Automatic

pickup

movement

Yes

Automalic

speed

selection-

Yes

Wow

and

fiutier,

DIN

29.05%

—_

Wow

and

flutter,

WRMS.

+0.028%

___

Rumble

DIN

unweighted

4508

Rumble

BIN

weighted

6508

Speed

deviation

0.02%

Speed

control

range

Diat

for

speed

pointers

Siyius

pressure

range

Q-+t.d

gram

Tangential

tracking

.04"

Litt

system

Electronic

Anjishaling

Parallel

tracking,

error

angle

compensaled

Molor

Servo

contoted

Drive

system

Bell

Turntable

1.3

Dust

cover

Hingéd

and

detachable

Fower

supply

117

valts

Frequency

Power

consumption

watts

Dimensions

49x10

38cm

Weight

Pickup

MMC

6000

Styius

Pramanik

diamond

Radius

curvature

{GD-4

quadro]

Frequency

range

20-15,000H7

1.506

45,000

(CD-4)

Channel

separation

7000Hz

25dB

400

40.000

20da

"Channel

difference

1.508

Infegrmodulation

Recommended

siyius

pressure

gram

Compliance

30x

10-Bem/dyn

Eifective

tip

mass

6,22

Output

m¥fomisec,

6.6

mid?

kohms

Subject

change

without

nctice

DISASSEMBLY

Bang

Olufsen

2-1

ELECTRICAL

DESCRIPTION

Since

the

circuitry

the

Beogram

4002

6000

type

551x

basically

idetitical

with

that

the

type

550x,

the

electrical

description

will

give

chief

attention

those

circuits

which

are

fundamentally

different.

Record

wiping

With

activated

the

STAND

mode,

the

turntable

will

rotaie

but

the

slide

will

not

travel

in,

making

record

wiping

possible.

the

STAND

mode,

1TRI

kept

forward

biased

through

LR9,

1R7

and

1R6,

1f33

activated,

the

junction

1R9

and

LR?

connected

chassis

potential.

ITR1

reverse

biased,

the

collector

goes

high:

this

level

transmitted

through

1D8

the

base

series

transistor

LIC]

forward

bias,

with

the

result

that

voltage

available

fram

the

power

supply

section.

The

high

level

likewise

transmitted

the

electronic

switch

through

1D10,

thus

blocking

the

functions

the

electronic

switch

and

preventing

slide

transport.

The

turntable

will

rotate

only

long

activated.

Tacho

control

The

turntable

driven

atacho-controlled

motor.

generator

the

motor

furnishes

voltage

whose

frequency

dependent

the

motor

speed.

This

vollage

fed

the

network

1CS

1R24

LIC3,

The

voltage

converted

square,

which

passed

Schmit

trigger.

The

frequency

the

square,

dependent

the

motor

speed,

controls

one

Bang

Olufsen

the

output

levels

the

Schmitt

trigger;

the

other

output

level

controlied

from

variable

time

constant

network

consisting

1C3

1R4-1R16-2R1

for

45r.p.m.

and

103-

}RI5-1R1?

-2R2

for

r.p.m.,

olor

Variabie

frequency

tne

constant

TEI

Qul

schmilt

lngger

LLL.

schaitt

trigger

The

output

signal

the

Schmitt

trigger

(pin

integrated

across

R19

1C8

and

fed

which

differential

amplifier.

The

integrated

signal

will

voltage

which

varies

with

the

motor

speed.

This

voltage

fed

via

the

differential

amplifier

power

amplifier.

Fhe

power

amplifier

connected

variable

resistor

chassis

potential.

1C10-

1C9-1R20

prayides

negative

feedback

tor

the

power

amplifier

(see

sketch),

preventing

“overregulation™.

1D14

1149

1R21

provide

guarantee

that

the

voltage

across

the

motor

can

only

reach

certain

value

(sec

sketch).

Amplit.

cohen

Normal

speed

Speed

mal

When

starting

from

motor

stand-still,

the

power

amplifier

will

receive

heavy

drive

obtain

very

rapid

speed

increase.

Approx.

§.5¥

present

the

anode

the

voltage

goes

below

4.6V,

then

1D49,

3.3V

Zener

diode,

will

forward

biased,

thus

preventing

the

voltage

across

the

motor

from

exceeding

approx.

4.4V

that

the

speed

increase

when

starting

will

not

heavy

that

the

motor

reaches

twice

its

wanted

speed,

since

the

motor

regulating

circuil

capable

taking

hold

twice

that

speed.

The

motor

regulating

circuit

powered

with

via

the

series

transistor

LTR2,

controlled

1D13.

1D13

Zener

diode.

ernad

Bang&Olufsen

2-3

Automatic

speed-change

switch,

Motor

contrat

will

assume

our

starting

point

thai

record

the

turntable.

When

activated

and

the

slide

begins

travelling

in,

the

conditions

for

lowering

the

pickup

arm

are

not

present.

The

collector

1TR6

will

low.

This

low

level

transmitted

the

base

ITR8

reverse

bias.

The

collector

{TR8

and

hence

the

base

11C2

will

float,

result

which

11C2

will

reverse

biased

and

1RL1

will

the

neutral

position

(the

33-r.p.m.

positioa).

When

the

slide

passes

the

position

giver

mark

for

touch-down

cm,

43C1

and

hence

1TR1?

are

reverse

biased,

the

collector

1TR17

goes

high,

which

high

level

will

attempt

charge

1C2!

the

time

constant

network

1R46-

121,

bui

since

the

position

marker

very

narrow,

1C21]

cannot

obtain

full

charge

before

41C1,

and

consequently

1TR17

are

forward

biased.

Since

record

the

turntable,

the

conditions

for.

lowering

the

pickup

arm

are

not

yet

present,

and

the

slide

will

continue

travel

in.

The

slide

reaches

the

position

marker

for

lower

speed

change,

41C1

and

hence

1TRI7

are

again

reverse

biased,

this

time

far

longer

time

than

for

because

the

mark

for

speed

change

broader

than

the

mark

for

lower,

The

high

level

1TR17

can

now

have

time

charge

1C21,

1IC2

forward

biased,

1RL!

operates,

and

the

speed

changes

r.p.m..

When

the

slide

reaches

the

mark

for

lower,

and

have

17¢m

record

the

turntable,

the

conditions

for

lowering

the

pickup

arm

are

present.

The

collector

1TR6

goes

high,

which

high

level

transmitted

the

base

of iT

forward

bias.

The

collector

1TR8

goes

low,

and

112

now

kept

forward

biased

through

1RLI,

1R11,

1R25

and

ITR8.

pha

Magnet

cail

circuit

Bang

Oluisen

The

collector

1TR&

connected

via

1D32

the

"Motor

control

IN”

section

the

electronic

switch

that

automatic

speed

change

r.p.m.

can

occur

only

while

the

slide

travelling

(high

the

collector

1TR12).

low

level

the

collector

ITR12

places

the

cathode

1D32

chassis

potential,

and

1C?1

cannot

charged.

When

switching

manually

from

r.p.m.,

activated,

relay

]RL1

operates,

aud

11C2

forward

biased

through

IRL1

and

IRiL.

1f33

activated,

the

bias

for

11C2

shorted

chassis

through

1D12,

LIC2

reverse

biased,

and

LRLI

releases.

1D12

prevents

1{C2 from

being

forward

biased

through

19.

IDH

protects

against

induction

peaks.

When

the

requirements

for

lowering

the

pickup

have

been

met,

the

collector

ITR6

high;

this

high

tevel

transmitted

via

1D22

the

LOWER

section

the

electronic

switch

fixed

level

the

cathode

1D35,

When

the

slide

switch

passes

the

position

giver

mark,

the

collector

1TR17

mentioned

before

goes

high;

this

high

level

transmitted

the

base

1TR?

forward

bias.

1020

will

charge

throngh

1D23,

1TR7

and

1D21.

The

charging

current

1C20

gives

negative

voltage

jump

the

cathode

1D22.

This

low

pulse

fed

the

electronic

switch

activate

its

LOWER

section.

ensure

that.1C20

will

not

pick

charge

from

the

speed-change

switch

through

1D21

and

1TR7,

1D50

shorts

the

base

1TR17

chassis

potential

when

the

collector

ITR6

low.

1219

and

the

time

constant

network

1R4i

1C19

ensure

that

automatic

lowering

will

not

occur

when

ihe

detector

arm

reaches

above

the

bright

portion

the

turntable

(with

record

ihe

turntable).

Ifa

low

level

applied

the

base

1TR9,

1TR9

reverse

biased,

the

collector

high

and

11C4

reverse

biased;

ORLI

will

the

neutral

position,

+304

the

base

ITR9

goes

high,

TR9

forward

biased;

the

collector

goes

low,

and

11C4

likewise

forward

biased

and

magnet

coil

ORE

operates.

Parts

the

collector

current

11C4

will

charge

1C23

across

1R55

and

1R54.

When

1C23

charged

level

approx.

0.7V,

1TR10

forward

biased.

The

collector

current

1TR10

will

impose

Joad

the

drive

ITR9,

1TR9

draws

Jess

current;

this

limits

the

current

11C4,

and

hence

the

magnet

coil,

from

amps

the

memeni

the

magnet

coil

operates

approx.

150

mA.

When

1C23

has

accumulated

charge,

[R53

and

(R55

are

connected

operate

base

bias

divider

for

RIO

such

way

that

the

higher

the

collector

voltage

11C4,

the

higher

the

forward

bias

ITR10,

1TR10

draws-more

current,

the

base

1TR9

heavily

loaded,

and

the

collector

current

11C4

limited

mentioned

abeve.

1TR10

accordingly

provides

negative

feedback.

Bang

Olufsen

2-5

DEMODULATOR

Forsicer-

ker

Pick-up

MMC

BOU0

equa-|

lizing

eOO\EK

37%

latrix

Rear

Veastre

sierea

Low

pas

17K

Elektro-

nisk

CD-4

switch

Netdel

Eftekt

begrenser

Power

supply

The

CD-4

demodulator

has

stabilised

power

supply

its

own

which

uses

the

power

supply

the

control

circuits

reference.

Say

Carrier

detector

The

power

supply

series

transistor,

TR102,

forward

biased

TR1O1

and

TR1OO,

whose

base

receives

bias.

The

emitter

voltage

TR102

stabilised

TRIO3

and

D101.

30KHz

niveau

input

BkHz

Matrix

Bang

Oluisen

The

carrier

detector

serves

the

purpose

limiting

the

lock-in

range

the

PLL

kHz

carrier

drops

out.

Limiting

foHows

the

curve

shown,

the

slope

the

curve

(level

range)

being

adjusted

with

R43.

R11

used

for

selecting

the

kHz

level

which

regulation

starts.

JOKHZ

The

matrix

serves

the

purpose

mixing

the

sum

and

difference

signals

such

manner

that

the

front

and

rear

channels

appear

separately.

The

principle

the

matrix

is,

one

case,

add

the

two

signals

together

produce

the

front

signal

and,

the

other,

subtract

them

obtain

the

rear

signai.

The

difference

signal

fed

from

the

output

the

ANRS

circuit

the

base

TRG.

TR8

and

TR9

operate

differential

amplifier.

The

two

transisiors

have

common

emitter

resistor

that,

the

current

increases,

the

current

TR8

will

decrease

conmensurately

and

vice

versa.

Since

the

base

TR8

shorted

chassis

potential,

signal-wise,

conse-

quenily

obtain

the

collector

TR9

signal

that

phase

opposition

the

signal

the

base

TR9

and,

the

collector

TRS,

signal

that

phase

with

the

signal

the

base

TRY.

The

signals

are

mixed

across

resistors

R81,

R83,

R82

and

R84,

resulting

the

appearance

the

and

signais-at

C52

and

C53,

respectively.

Bang

Oluisen

Stiand

The

silent

circuil

ensure

that

the

outputs

the

Beogram

6000

are

silent

when

the

pickup

arm

not

lowered.

cS2heo

CSkyetng

E9,

Electranic

CQ-4

suit

When

the

pickup

arm

lowered,

approx.

will

present

P8.

The

charge

picked

C104

ensures

that

the

channels

are

silent

while

the

pickup

arm

being

fowered.

When

the

bias

the

base

TR108

reaches

approx.

+1.2

¥,

TR108

forward

biased.

The

collector

TR108

goes

low,

TR107

reverse

biased,

the

emitter

TR107

goes

low,

and

CD-4

record

being

played,

the

low

level

the

emitter

TR107

will

irans-

mitted

the

bases

TRS,

TR15

and

TR16,

respectively;

both

the

front

and

rear

channels

will

then

open.

the

pickup

arm

raised,

the

voltage

drops

to0

TR108

reverse

biased,

the

collector

goes

high

and

TR10?

forward

biased.

The

emitter

TRi07

goes

high;

this

high

level

transmitted

the

base

TRIS

and,

via

DIOS,

the

bases

TR16

and

TRS,

TR15,

TRt6

and

TRS

ate

forward

biased

that

the

signal

path

both

front

and

rear

channels

well

the

difference

signal

the

ANRS

circuit

are

shorted

chassis

potential.

D106

and

R123

ensure

rapid

discharge

C104

when

the

pickup

arm

begins

rise.

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