Teac BX-300 Manuale utente

TEAC

SERVICE

MANUAL

BX-300

High

Speed

DC

Integrated

Amplifier

BX-300

DC

Integrated

Amplifier

CONTENTS

1.

Specifications

and

service

data...

2.2...

ee

es

2

2.

Parts

WOCAtiON

=

650

oS

S0e

Be

aca

Se

ce

ee

a

ee

Stee

ap

ale

a

ae

eS

ee

eae

a

ee

3

3.

Adjustments

and

voltage

conversion...

2.2...

ee

es

4

4.

Block

and

level

diagram

2...

ee

6

5.

Parts

location

and

parts

list

(BX-500)

2.2...

es

8

6.

Parts

location

and

parts

list

(BX-300)

..

2...

2.

ee

14

7.

PC

boards

and

parts

list

(BX-500).

2...

ee

20

8.

PC

boards and

parts

list

(BX-300)..

2...

ee

26

CAUTION

A.

Parts

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:

August,

1979

C-90019

5704001500

BX-500/8X-300

1

SPECIFICATIONS

AND

SERVICE

DATA

SPECIFICATIONS

Input

Level

PHONO

MC

PHONO

MM

TUNER,

AUX

TAPE

1,

2

Input

Impedance

PHONO

MC

PHONO

MM

TUNER,

AUX

TAPE

1,2

Output

Level

TAPE

REC

1,

2

Rated

Output

Power

(Both

channels

driven,

Distortion

0.1

%,

Impedance

8

©,

1

kHz)

Required

Speaker

Impedance

SPEAKERS

Select

AorB

SPEAKERS

Select

A+B

Power

Consumption

Weight

Dimensions

Width

Height

Depth

Power

Requirement

and

Frequency

SERVICE

DATA

Power

Muting

Time

3~8

Seconds

AUX

Section

Characteristic

Frequency

Response

10

Hz~

30

kHz

(0

dB

+

1

dB)

Input:

1kHz,

7

mV

+3

dB

Output:

1V

TONE

Controls

100

Hz

1

kHz

BASS

and

TREBLE

MAX

+7dB

+1dB

OdB+1dB

+7dB

+1dB

BASS

and

TREBLE

MIN

—7dB+1dB

OdB+1dB

-—7dB

+1dB

Harmonic

Distortion

20Hz

Lessthan

0.01%

1kHz

Lessthan

0.008%

20

kHz

Lessthan

0.1%

Channel

Separation

More

than

42

dB

(At

1

kHz)

Noise

Level

Lessthan

560uV

(-65dB),

Damping

Factor

(8.2)

50

LOUDNIESS

Control

(—40

dB)

100

Hz

+8

dB

+1

dB

20

kHz

+5

dB

+1

dB

Muting

Circuit

(BX-500)

—21

dB +2

dB

LOW

CUT

Filter

(BX-500)

—3

dB

+1

dB/20Hz

TONE

OUT

Circuit

(BX-500)

+0

a)

Frequency

Response

10Hz

_4

dB

100

&Hz

ir

dB

b)

Marmonic

Distortion

29

Hz

Less

than

0.008%

1kHz

Lessthan

0.008%

20

kHz

Lessthan

0.2%

c)

Woise

Level

10

k

ohm

150

mV

55W+55W

4~16

ohm

8

~

16

ohm

100

W

8.5

kg

(18-12/16

Ibs)

410

mm

(16-1/8”)

140

mm

(5-1/2)

272

mm

(10-11/16")

BX-300-—_—___—_—__

50

2V

2.5

mV

150

mV

150

mV

15

ohm

47k

ohm

10k

ohm

10k

ohm

150

mV

35W+35W

4~16

ohm

8~16

ohm

80

W

8.0

kg

(17-10/16

Ibs)

410

mm

(16-1/8")

140

mm

(5-1/2")

272

mm

(10-11/16")

Weighted

GENERAL

EXPORT

|

100,117,220,240

50/60

U.K.,AUSTRALIA

|

240

|

50

USA,CANADA

|

17

|

S60

Phono

MM

Section

Input

Level

(input

terminal

3.3

ohm)

2.5

mV

+3

dB

(1

kHz)

Frequency

response

(RIAA

Characteristic)

20

Hz

+19

dB

+1dB

100

Hz

+13.1

dB

+0.5

dB

10

kHz

-13.7

eB

20.508

|

KHz

OB

10

kHz

20

kHz

—19.6

dB

+1

dB

Noise

Level

Less

than

48

»V

(

—86

dB

),

Weighted

Harmonic

Distortion

20Hz

Lessthan

0.01%

1kHz

Lessthan

0.005%

20

kHz

Lessthan

0.1%

Phono

MC

Section

Input

Level

(Input

Terminal

3.3

ohm)

50

nV

+3 dB

(1

kHz)

Frequency

response

(RIAA

Characteristic)

20

Hz

+19dB

+1

dB

1kHz

OdB

20

kHz

—19

dB

+1

dB

Noise

Level

Less

than

250

uV

(

—72

dB

),

Weighted

Harmonic

Distortion

Less

than

0.03%

Less

than

0.03%

Less

than

0.7%

Less

than

0.1%

Less

than

0.1%

Less

than

0.7%

1

kHz

20

kHz

The

power

requirements

for

products

distributed

in

certain

countries

of

Europe,

U.K.,

Australia,

Canada

and

the

United

States

are

not

adjustable.

e

Improvements

may

result

in

features

or

specifications

change

without

Less

than

200

uV

(—74

dB),

Weighted

notice.

BX-500/BX-300

2

PARTS

LOCATION

BX-500

R139

TP.1

TP.2

TP.6

R239

TP.5

TP.3

TP.

iN/OUTPUT

PCB

Assy

MAIN

PCB

Assy

R233

METER

PCB

Assy

=

We

SW

PCB

Assy

Voltage

Selector

“

¢

;

|

cane

¢

TONE

CON

AMPL—_—_—r

PCB

Assy

:

7

R713

TONE

CON

AMPL

R813

R133

VOLUME

PCB

Assy

TA-1066

PCB

Assy

BX-300

R130

TP.1TP.5

TP.3

TP.6

TP.4

R230

TP.2

ayes

—

IN/OUTPUT

roe

PCB

Assy

Voltage

Selector

SW——;—

pee”)

SW

PCBA

yy

VOLUME

PSB

Assy

TONE

CON

AMPL

PCB

Assy

TA-l067

BX-500/BX-300

|

3

ADJUSTMENTS

AND

VOLTAGE

CONVERSION

3.1

BEFORE

ADJUSTMENT

(Do

not

apply

AC

power)

1.

Set

the

VOLUME

control

to

MIN

and

SPEAKERS

selector

to

OFF.

2.

Set

the

semi-fixed

variable

resistors

at

the

following

positions.

R133/R233

(BX-500)

R124/R224

(BX-300)

R139/R239

(BX-500)

R130/R230

(B

X-300)

At

the

center

of

full

turning

range

Fully

counter-clockwise

3-2.

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-500)

or

R124/R224

(BX-300)

so

that

the

voltmeter

indicates

0

V

+

10

mV.

Note:

A

differential

voltmeter

is

preferable.

OC

VOLTMETER

TA-1068

3-3.

IDLING

CURRENT

ADJUSTMENT

Connect

the

DC

voltmeter

between

T.P-1

and

T.P-2.

.

Adjust

R139

(BX-500)

or

R130

(BX-300)

so

that

the

DC

voltmeter

indicates

approx.

100

mV.

.

After

R139

(BX-500)

or

R130

(BX-300)

adjusted,

wait/30

seconds

for

idling.

.

Connect

the

DC

voltmeter

between

T.P-3

and

T.P-4.

Repeat

procedures

1

to

4

above

and

adjust

R239

(BX-500)

or

R230

(BX-300).

1.

2

3

4.

Readjust

R139

(BX-500)

or

R130

(BX-300)

so

that

the

DC

voltmeter

indicates

26

mV

+15 mV.

5

6.

N

|

BX-500/BX-300

OTE:

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

amplifier,

thereby

causing

a

short.

Use

the

oscilloscope

in

the

floating

state.

DC

VOLTMETER

100

mv

26

mV

i

L

"

*e

|

ur

&

3-4

POWER

OUTPUT

METER

ADJUSTMENT

(BX-500

only)

1.

Connect

the

AC

voltmeter

to

the

SPEAKERS

A

terminal.

.

Set

the

VOLUME

control

to

MAX.

oO

PF

Wh

NOTE:

BX-500

should

be

placed

in

the

normal

operating

position.

3-5

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.

Remove

the

top

and

side

metal

cover

by

removing

screws

in

each

side

of

the

metal

cover.

2.

Locate

the woltage

selector

plug

on

the

left

side

of

the

BX-500,

BX-300.

3.

Remove

the

plug

by

pulling

it

out

and

re-install

it

so

that

the

arrow

on

the

plug

exactly

lines

up

with

the

white

line

that

in-

dicates

the

appropriate

voltage.

4.

Replace

the

top

cover.

R139(R130)

.

Set

the

SPEAKERS

selector

to

A

and

SOURCE

selector

to

AUX.

-

Apply

a

1

kHz

input

signal

to

provide

an

output

power

of

50

W

(approx.

20

Vrms)

to

AUX

terminals

(AUX

input

approx.

150

mV).

.

Adjust

R713

and

R813

so

that

the

Power

Output

Meters

indicate

50

W.

117V

lOOV

TA-

065

BX-500/BX-300

4

BLOCK

AND

LEVEL

DIAGRAM

BX-500

[MONITOR

]

TAPE

2,

[move]

—

[Louoness]

[VOLUME

]

TONE

CONTROL

BUFFER

BALANCE

Roh(

TAPE

PLAY

2)

Reh

TAPE

REC

2)

PROTECTOR

CIRCUIT

1

Sa

eta

ae;

4

PHONO

|

MC

WATTS

METER

COPPLY

+8

RECTIFIER

paral

TA-1070

+40

+30

F

SPEAKERS:

60,

S5W

#20:

avems

*10-F

;

HEAD

PHONES

+

$0.0:25W.

oT

Ul

Lavems

FLAT

AMPL

t

+10

=

1808

r

ecesevred

~20

|

“TONE

SW

OUTRUNPY

POSITION

=80)

£0

AMPL

G2

35.508

~a0

-50

ea:

-60

-70

+

-80

|

-90

|

f:

1

KHz

BX-500/BX-300

BX-300

rfaBe}

|

prar2

O

@

|

PLAY!

‘Cc

°9

Reh{TAPE

PLAY

2)

g)

fe

O

99

Reh(TAPE

REC

2)

IN/OUT(DIN)

|

i

LIN/OUT(OIN)

\

TAPE

COPY

MONITOR

LOUDESS

Tap

TAPE2

REC

2

Co

°

SOURCE

SOURCE,

™

(11)

CN

Gaal

lina

@@

@

©

lo

N

reel

&

ami

(0)

°

CONTROL

pia

©)

TA-1072

+30

SPEAKERS

oe

6n,35W

POWER=AMPL

16.7

Vrms

+10

G*25,.7d8

HEAD

PHONES

ies

Sot

Be

:

60,0.25W

L4vi

-10

AVems

ate

Beis

-20

i

eae

en

=20

EQ

AMPL

~40

G

35548

-50

-60

ens

-70

ne

AMPL.

Bg,

BAO

wet

et

hateas

-60

os

-90

(50uV)

:

f:

1kHz

BX-500/BX-300

5

PARTS

LOCATION

AND

PARTS

LIST

(BX-500)

NOTE:

BX-500B

on

parts

list

shows

black

type

of

front

panel.

PARTS

LOCATION-1

12

3

4

5

6

2

7

8

10

12

9

i214

13 l2

3-M4x6

(Round

Washer

Head

BLK)

Parts

marked

with

*require

longer

delivery

time

than

regular

parts.

REF.

NO.

PARTS

NO.

DESCRIPTION

REMARKS

1-1

*5534772000

Escutcheon,

Power

Switch

*5800004800

Escutcheon,

Power

Switch

(BX-500B)

1-2

5534774000

Button,

Power

Switch

5800004600

Button,

Power

Switch

(BX-500B)

1-3

*5503215000

Cover

Assy,

Meter

*5800005200

Cover

Assy,

Meter

(BX-500B)

1-4

*5533224000

Escutcheon,

Meter

*5800005100

Escutcheon,

Meter

(BX-500B)

1-5

*5533220000

Cover,

Meter

1-6

*5502252000

Panel

Assy,

Front

*5800006600

Panel

Assy,

Front

(BX-500B)

1-7

*5553327000

Escutcheon,

Volume

*5800007100

Escutcheon,

Volume

(BX-500B)

1-8

5555784000

Knob,

VOLUME

5800007000

Knob,

VOLUME

(BX-500B)

1-9

5555785000

Knob,

SPEAKERS:

BASS:

TREBLE

5800007200

Knob,

SPEAKERS-

BASS:

TREBLE

(BX-500B)

1-10

5555729000

Knob,

SOURCE

5800007300

Knob,

SOURCE

(BX-500B)

1-11

*5534781000

Escutcheon,

Lever

(3P}

*§800007500

Escutcheon,

Lever

(3P)

(BX-500B)

1-12

5534779000

Knob,

Lever

5800007600

Knob,

Lever

(BX-500B)

1

-13

5555781000

Knob,

BALANCE

5800004400

Knob,

BALANCE

(BX-500B)

1-14

*5534780000

Escutcheon,

Lever

(2P)

*5300007400

Escutcheon,

Lever

(2P)

(BX-500B)

BX-500/BX-300

PARTS

LOCATION-2

10

18

(7

16

15

4

13)

12

Io

9

BM3x6

BM3x6 BM3x6

TA-1075

Parts

marked

with

*require

longer

delivery

time

than

regular

parts.

REF.

NO.

PARTS

NO.

DESCRIPTION

REMARKS

2-1

4

5134111000

Switch,

Power

JAPAN,

GENERAL

EXPORT

4

5134112000

Switch,

Power

U.S.A.,

CANADA

4.

5134125000

Switch,

Power

EUROPE,

U.K.,

AUSTRALIA

2-2

5165066000

Meter,

Power

Output

5296000200

Meter,

Power

Output

(BX-500B)

2-3

*5134113000

Switch,

Push

2-4

*5551042000

Chassis,

Front

2-5

5150250000

Resistor,

Variable

100k

ohm-B

x

2

2-6

*5158031000

PCB

Assy,

LED

*5157031000

PCB,LED

Partof2

-

6

2-7

5143139000

LED,(Green)

SLB-26GG1

Partof2

-

6

2-8

*5138014000

Switch,

Operation

2-9

*5132055000

Switch,

Lever

2

-10

*5534432000

Foot

2-11

5132050000

Switch,

Lever

2

-12

5132054000

Switch,

Lever

2

-13

5150249000

_

Resistor,

Variable

300

k

ohm

2

-14

5132051000

Switch,

Lever

2

-15

5132048000

Switch,

Lever

2

-16

5150251000

_

Resistor,

Variable

50k

ohm-B

x

2

2-17

5133016000

Switch,

Rotary

2

-18

5124022000

Jack,

Phones

2

-19

*5534118000

Rivet,

Push

BX-500/BX:300

|

PARTS

LOCATION-3

33

24 23

22

21

20

19

i6

15

14

13

12

PTTM3x6

BM3x8

PTT

M3x6

PTTM3x6

TA-l076

Teac BX-300 Manuale utente

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