Teac Bx-550 User manual

ag

TEAC.

SERVICE

MANUAL

BX-550

High

Speed

DC

Integrated

Amplifier

BX-330

DC

Integrated

Amplifier

The

BX-550B

and

the

BX-330B

have

a

black

finish;

otherwise,

they

are

the

same

as

the

BX-550

and

the

BX-330.

CONTENTS

1.

Specifications

and

service

data...

1.

1

ee

ce

eee

ee

eee

2

2.

Voltage

conversion...

we

ce

ee

eee

et

ene

3

3:

Main

parts

locations

occ

ice

eee

ee

we

ee

eee

eas

4

UO

0110030111

ae

a

ee

Re

ae

5

5.

Block

and

level

diagram

2...

1...

ee

nee

8

6.

Parts

location

and

parts

list

(BX-550)

2...

.

ee

eee

10

7.

Parts

location

and

parts

list

(BX-330)

.

2.0...

1

eee

et

ees

18

8.

PC

boards

and

parts

list

(BX-550)

2...

ee

eee

27

9.

PC

boards

and

parts

list

(BX-330)

.

2...

ee

eee

34

CAUTION

AParts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

components

-

refer

to

the

TEAC

Parts

List

and

ensure

exact

replacement.

Effective:

October,

1980

5704007100

ol

I

BX-550/BX-330

1

SPECIFICATIONS

AND

SERVICE

DATA

e

Improvements

may

result

in

features

or

specifications

changing

without

notice.

SPECIFICATIONS

Input

Sensitivity

PNONO

MC

PHONO

MM

TUNER,

AUX

TAPE

1,2

Rated

Output

Voltage

TAPE

REC

1,

2

Rated

Output

Power

(Both

channels

driven,

Distortion

0.1%,

Impedance

8

ohms,

1

kHz)

Required

Speaker

Impedance

SPEAKERS

selector

in

position

A

or

B

Dimensions

Width

x

Height

x

Depth

Weight

Power

Requirements

SERVICE

DATA

BX-550

BX-330

50

pV/33

ohms

50

uV/15

ohms

2.5

mV/47

k

ohms

2.5

mV/47

k

ohms

150

mV/10

k

ohms

150

mV/10

k

ohms

150

mV/10

k

ohms

150

mV/10

k

ohms

150

mV/2.2

k

ohms

150

mV/2.2

k

ohms

55W+55W

35W+35W

8

~

16

ohms

8

~

16

ohms

410

x

140

x

320

(mm)

(16-1/8"

x

5-1/2"

x

12-5/8”)

9

kg

(19-13/16

Ibs)

net

410

x

140

x

320

(mm)

(16-1/8"

x

5-1/2”

x

12-5/8"}

7.5

kg

(16-9/16

Ibs)

net

Voltage

Power

Consumption

(W)

(V)

(Hz)

BX-550

BX-330

GENERAL

EXPORT

100,

117, 220,

240

50/60

|

100i]

SY

PEUROPE.

220

2

0

100

|

8

U.K.,AUSTRALIA,

[|

240s

|

SC

se

|

St“

s|

U.S.A.,

CANADA

Rs

|

The

power

requirements

for

products

distributed

in

the

U.K.,

Australia,

Canada

and

the

United

States

and

certain

other

areas

in

Europe

are

not

adjustable.

Power

Muting

Time

3

~

8

Seconds

LOUDNESS

Control

—

AUX

Section

——

Output:

150

mV

TONE

Controls

1kHz:

0

dB

(reference)

Input:

7

mV

+

3

dB

100

Hz:

+8dB+1dB

Output:

1V

20

kHz:

+5

dB

+1dB

MUTING

Circuit

(BX-550)

Output:

MUTING

OUT,

10

V

at

1

kHz

BASS:

FLAT

TREBLE:

FLAT

OdB:1dB

|

OdB

(Ref.)

0dB+1dB

MUTING

IN,

0.9

V

+2

dB

BASS:

MAX

LOW

CUT

Filter

(BX-550)

+7dB+

dB+1dB

+7dB+1dB

TREBLE:

MAX

ical

:

Output:

LOW

CUT

OUT,

10

V

at

20

Hz

BASS:

MIN

|

oae148

|

LOW

CUT

IN,

7V+1dB

-7dB+1dB

|

0dB+1dB

-7dB+1dB

Z

TREBLE:

MIN

al

TONE

OUT

Circuit

(BX-550)

Harmonic

Distortion

a)

Frequency

Response

Output:

55

W

(BX-550),

35

W

(BX-330)

TONE:

OUT,

VOLUME

Control:

MAX

20

Hz:

Less

than

0.01%

Output:

1

V

at

1

kHz

(reference)

1kHz:

Less

than

0.008%

10

Hz:

=

dB

20

kHz:

Less

than

0.1%

_

+0

Maas

100

kHz:

*°

dB

More

than

42 dB

(ratio)

at

1

kHz.

b)

Harmonic

Distortion

Noise

Level

20

Hz:

Less

than

0.01%

VOLUME

Contro!:

MAX,

INPUT:

Shorted

1kHz:

Less

than

0.008%

Less

than

560

zV

(-65

dB),

Weighted

20

kHz:

Less

than

0.1%

Damping

Factor

43

or

more

at

1

kHz,

82

21

or

more

at

20

kHz,

82

c)

Noise

Level

Less

than

320

uV

(-70

dB),

Weighted

—

Phono

MM

Section

—

SOURCE

Selector:

PHONO-MM,

VOLUME

Control:

MIN

input

Level

input:

1

kHz/2.5

mV

(Signal

source

impedance:

3.32)

REC

QUT:

150

mV

+3

dB

Frequency

Response

+19

dB

+1dB

+13.1

dB

+0.5

dB

0

dB

(reference)

-13.7

dB

+0.5

dB

~19.6

dB

+1

dB

20

Hz:

100

Hz:

1

kHz:

10

kHz:

20

kHz:

Harmonic

Distortion

Output:

7V

20

Hz:

Less

than

0.01%

1kHz:

Less

than

0.005%

20

kHz:

Less

than

0.1%

Noise

Level

Input:

3.30

terminate

Less

than

48

xV

(approx.

-86

dB),

Weighted

BX-550/8X-330

—

Phono

MC

Section

——

;

SOURCE

Selector:

PHONO

MC,

VOLUME

Control:

MIN

Input

Level

Input:

1kHz/50

pV

(Signal

source

impedance:

3.32)

REC

OUT:

150

mV

+3

dB

Frequency

Response

20Hz:

+19dB+1dB

1

kHz:

0O4dB

(reference)

20

kHz:

-19dB+1dB

Harmonic

Distortion

REC

OUT:

1V

20

Hz:

Less

than

0.1%

1kHz:

Less

than

0.1%

20

kHz:

Less

than

0.7%

Noise

Level

Input:

3.320

terminate

Less

than

250

uV

(approx.

-72

dB),

Weighted

2

VOLTAGE

CONVERSION

VOLTAGE

CONVERSION

(GENERAL

EXPORT

MODEL

ONLY)

BE

SURE

TO

REMOVE

THE

POWER

CORD FROM

THE

AC

OUTLET

BEFORE

REMOVING

THE

OUTER

CASE

AND

RE-

POSITIONING

THE

VOLTAGE

CONVERSION

PLUG.

1.

2.

Remove

the

top

and

side

metal

cover

unit

by

removing

the

screws

from

each

side.

Locate

the

voltage

selector

plug

on

the

left

side

of

the

BX-550/

BX-330.

Remove

the

plug

by

pulling

it

out,

then

re-insert

it

so

that

the

arrow

on

the

plug

exactly

fines

up

with

the

white

line

that

in-

dicates

the

appropriate

voltage.

.

Replace

the

cover.

Fig.

1

BX-550/BX-330

3

PARTS

LOCATION

BX-550

R139

TP-|

TP-2 TP-6

R239

TP-5

|

TP-3

|

TP-4

IN/OUTPUT

PCB

Assy

MAIN

PCB

Assy

Power

Transformer

R133

R233

Voltage

Selector

SW

PCB

Assy

METER

AMPL

PCB

Assy

VOLUME

PCB

Assy

ee

3

a

R726/R826

TONE

CON

AMPL

PCB

Assy

R728

BX-330

RI3O

TP-1

TP-2

TP-G6

R230

TP-5

|

TP-3

|

TP-4

IN/OUTPUT

PCB

Assy

MAIN

PCB

Assy

Power

Transformer

Sia

R224

Voltage

Selector

SW

PCB

Assy

LED

PCB-I3!

Assy

VOLUME

PCB

Assy

R903 R904

TONE

CON

AMPL

PCB

Assy

BX-550/B8X-330

4

ADJUSTMENTS

4-1

BEFORE

ADJUSTMENT

(Do

not

apply

AC

power)

1.

Set

the

VOLUME

control

to

MIN

and

the

SPEAKERS

selector

to

OFF.

2.

Set

the

semi-fixed

variable

resistors

to

the

following

positions.

R133/R233

(BX-550)

R124/R224

(BX-330)

R139/R239

(8X-580)|

Be

te

ata

Gta

R130/R230

(BX-330)

.

whore

|

At

the

center

position

4-2.

MID-POINT

POTENTIAL

ADJUSTMENT

1.

Depress

POWER

switch

to

ON.

2.

Connect

the

DC

voltmeter

between

T.P-5

(for

L-ch)

or

T.P-6

(for

R-ch)

and

GND.

3.

Adjust

R133/R233

(BX-550)

or

R124/R224

(BX-330)

so

that

the

voltmeter

indicates

0

V

+50

mV

DC.

Note:

A

differential

voltmeter

is

preferable.

DC

VOLTMETER

Bie

ee

i)

.

Fig.

2

BX-550/BX-330

4-3

IDLING

CURRENT

ADJUSTMENT

.

Connect

the

DC

voltmeter

between

T.P-1

and

T.P-2

(L-ch).

.

Adjust

R139

(BX-550)

or

R130

(BX-330)

so

that

the

DC

volt-

meter

indicates

approx.

100

mV.

.

After

adjusting

R139

(BX-550)

or

R130

(BX-330),

allow

30

seconds

for

the

amp

to

warm

up.

.

Readjust

R139

(BX-550)

or

R130

(BX-330)

so

that

the

DC

voltmeter

indicates

20~30

mV.

(Idling

current

30~45

mA).

.

Connect

the

DC

voltmeter

between

T.P-4

and

T.P-3

(R-ch)

.

Repeat

procedures

1

to

4

above

and

adjust

R239

(BX-550)

or

R230

(BX-330).

NOTE:

When

using

an

oscilloscope,

instead

of

the

DC

voltmeter,

carefully

connect

the

oscilloscope

so

that

the

oscilloscope

GND

terminal

is

not

connected

to

the

GND

of

the

ampli-

fier,

thereby

causing

a

short.

Use

the

oscilloscope

in

an

ungrounded

state.

Oem

me

meme

ene

=

PEAS.

DC

VOLTMETER

20~

l0Omv

30mvV

Fig.

3

4-4-1

POWER

OUTPUT

METER

ADJUSTMENT

(BX-550)

Refer

to

Fig.

4.

1.

2.

Pw

oan

n

uo

Connect

the

AC

voltmeter

to

SPEAKERS

terminal

A.

Set

the

SPEAKERS

selector

to

A

and

the

SOURCE

selector

to

AUX.

.

Set

the

VOLUME

control

to

MAX.

.

Apply

a

1-kHz

input

signal

to

provide

an

output

power

of

1

W

(approx.

2.83

Vrms)

to

the

AUX

terminals.

.

Adjust

R726

so

that

the

Power

Output

Meters

indicate

1W.

.

Connect

the

DC

voltmeter

between

8

and

2

of

U701.

.

Adjust

R826

so

that

the

DC

voltmeter

indicates

OV.

.

Set

the

VOLUME

control

to

MIN.

.

Connect

the

DC

voltmeter

between

the

collector

of

0702

and

GND.

.

Adjust

R728

so

that

the

DC

voltmeter

indicates

OV.

ie

Faaion)

of

ns

e

4-4-2

LED

METER

ADJUSTMENT

(BX-330)

Refer

to

Fig.

5.

1.

2.

3.

4.

Connect

the

AC

voltmeter

to

SPEAKERS

terminal

A.

Set

the

SPEAKERS

selector

to

A

and

the

SOURCE

efector

to

AUX.

Set

the

VOLUME

control

to

MAX.

Apply

a

1-kHz

input

signal

to

provide

an

output

pover

of

1W

(approx.

2.83

Vrms)

to

the

AUX

terminal.

.

Adjust

R903

(L-ch)/R904

(R-ch)

so

that

the

POWER

LEVEL

meter

just

begins

to

indicate

3W.

|

BX-550/BX-330

ROSAS

Ae

ts

:

EAC

5210017400

1P-S30-HB

a

Fig.

4

R904 R903

LED

PCB-I3t

ait

ahaRal

Vatatphntnte

Fig.

5

BX-550

[TAPE

COPY

|]

TAPE

je?

SOURCE

5

BLOCK

AND

LEVEL

DIAGRAM

BX-550

WG-0

OTAPE

2©1

[wooe]

[COUDNESS]

©

[VOLUME

O

MONO

_,

SOURCE

STEREO

os

~O0—-O-

O--O

TAPE

2

REV_,

!

FLAT

ioe

cS

AMPL.

—

in

o

(2)

é

Ort

IN

2)

(5)

H

(TREBLE)

oO!

o

BALANCE

Reh

TSPEAKERS

3

MUTING

]

(7)

(9)

@

:

POWER

AMPL.

out

068

ave

is

=208,

©

PROTECTION

Ok

a

CIRCUIT

o

(6)

a

+25v

oc

—15V

AC

IN

POWER

+12v

SUPPLY

Suay

+47V

MAX

—

2Vv

+15

—47V

MAX

R

ch-e-—o—_“A

METER

AMPL,

WATTS

METER

VOLTAGE

RESPONSE

(dB

)

1ooy

+40

80

“|

C

SPEAKERS]

ved

SSwi2tv),

8h

love

+20

.

POWER

AMPL.

|

G=26¢8

;

al

i

O.25W(1.4V),

19

eo

T

AMPL

1

FLAN

.

mo

te

=

18

6B

200-4

a

(13Omv)

100

my

-20

mi

40

-30

ba

EQ

AMPL.

G=

35.548

10

mv

—40

44-50

2

1

my

~60

4009

=

-79

-—

MC

AMPL.

wo

©

100

pv

-80

50

-90

BX-330

(10)

TAPE

COPY

TAPE!

2

Sa

o

ANY

o

SOURCE

T

1

oTAPE2

|

TAPE

2

i

LO

Tx,

OUT

BX-330

TONE

AMPL.

POWER

AMPL.

PROTECTION

CIRCUIT

+40V

MAX

—40V

MAX

+

16V

poe

1S

POWER

SUPPLY

-—+

+B6V

+15V

a+

8

LED

METER

ie

METER

AMPL.

VOLTAGE

RESPONSE

(dB)

100Vv

+40

80

401

430

7

|

RS

20

35wit67V),

6

lov

a

+20

POWER

AMPL.

4

+10

G=

25.7

dB

_

PHONES

hod

ce]

O.25W(14V),

160

—_

FLAT

AMPL.

id

=10

6=

16.443

200

100

my,

-20

(150

mv}

307

7)

-30

“|

EQ

AMPL.

G=

35.5

68

iomvz|

-40

=

(2)

4)

-50

24

Imv—

=

60

id

MC

AMPL,

4005-79

}—

G=

34

4B

2004

1oopv

1

~80

50

-90

(80

pv)

Bx-550

10

—=—

wot

NO

Oh

oo

“11

“12

6

PARTS

LOCATION

AND

PARTS

LIST

(BX-550)

PARTS

LOCATION-1

Round

Washer

Head

M4x6

(BLK

Ni)

PARTS

NO.

*5800009900

*5552438000

*5534730000

*5800017700

*5800087700

*5800087800

*5800078800

5800087300

5800087400

*5800078700

5800078900

5800079000

*5800074800

5800074500

5800074600

5800074300

5800074400

5800009600

5800018300

*5124022000

DESCRIPTION

Cover,

Top

Cover,

Top

Button,

Push;

A

Button,

Push;

A

Parts

marked

with

*require

longer

delivery

time

than

regular

parts.

REMARKS

Escutcheon

Assy,

Meter;

B

Escutcheon

Assy,

Meter;

BB

Escutcheon,

LED

Panel

Assy,

Front;

B

Panel

Assy,

Front;

BB

Cover,

Meter

Knob,

VR

Knob,

VR

(B)

Lens,

LED

Knob,

Selector

Knob,

Selector

(B)

Knob,

VR;

S

Knob,

VR;

S

(B)

Knob,

Lever

SW

Knob,

Lever

SW

Jack,

PHONES

BX-550

BX-550B

BX-550

BX-550B

BX-550

Part

of

1

-

5

BX-550B

Part

of

1

-

BX-550

BX-550B

Partof1

-

3

BX-550

BX-550B

BX-550

BX-550B

BX-550

BX-550B

BX-550

BX-5508

BX-550B

Teac BX-550 User manual

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