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TEAC.

kat

SERVICE

MANUAL

T-X3000

AM/FM

Digital

Synthesizer

Tuner

As

regards

the

resistors

and

capacitors,

refer

to

the

circuit

diagrams

and

the

PCB

ass'y

drawing

contained

in

this

manual.

@

Parts

marked

with"

require

longer

delivery

time.

@

A

parts

marked

with

this

sign

are

safety

critical

components.

They

must

always

be

replaced

with

identical

component-refer

to

the

TEAC

parts

List

and

ensure

exact

replacement.

@

PC

boards

shown

viewed

from

parts

side.

Effective:

July,

1991

5704054000

—-FX3000

1.

SPECIFICATIONS

[FM

Section]

(IHF)

Tuning

Cover

Range:

~

87.5

MHz

~

108.0

MHz

(100

kHz

steps,

USA/Canada)

87.50

MHz

—

108.00

MHz

(50

kHz

steps,

Europe/UK/Australia/

General

Export)

Usable

Sensitivity

(IHF):

Mono:

13.2

dBf

(Europe/UK),

10.8

dBf

(Others)

50

dB

Quieting

Sensitivity:

Mono:

19.9

dBf

(Europe/UK),

17

dBf

(Others)

Stereo:

42-dBf

(Europe/UK),

39.2

dBf

(Others)

Alternate

Channel

Selectivity:

(98

MHz

£400

kHz)

78

dB

(Europe/UK),

68

dB

(Others)

Image

Response

Ratio:

80

dB

(Europe/UK),

43

dB

(Others)

RF

intermodulation:

©

70

dB

(Europe/UK),

65

dB

(Others)

Frequency

Response:

20

—

15,000

Hz

(+1

dB/-2

dB)

Capture

Ratio:

1.7

dB

(at

98

MHz)

Distortion

(at

65

dBf,

98

MHz):

Mono:

0.2

%,

Sterea:

0.4

%

"

Signal-to-Noise

Ratio

(at

65

dBf,

1

kHz):

Mono:

80

dB,

Stereo:

72

dB

AM

Suppression

Ratio:

65

dB

Stereo

Separation

(1

kHz):

40

dB

Output

(Level/impedance):

600

mV/

2.2

kahms

[AM

Section}

Tuning

Cover

Range:

530

—

1710

kHz

(10

kHz

steps,

USA/Canada)

522

—

1611

kHz

(9

kHz

steps,

Europe/UK/

Australia/General

Export)

Usable

Sensitivity:

50

dB/m

(316

V/m,

Loop

Antenna)

Selectivity:

25

dB

(+9

kHz

at

999

kHz)

Image

Response

Ratio:

42

dB

(at

999

kHz)

2.

CHECKS

AND

ADJUSTMENTS

FM

TEST

CONNECTIONS

MPX

Modulator

Dummy

ANT.

47k

Q

LA126

Connect

test

equipment

as

shown

in

diagram.

(A

DC

voltmeter

shall

be

connected

between

test

points

TP-2

and

TP-3

on

the

Main

PCB--that

is,

to

the

ends

of

R213.)

Dummy

Load

Connections

on

the

Main

PCB

inside

the

tuner

IF

Response

Ratio:

60

dB

(at

999

kHz)

Distortion:

0.5

%

(85

dB/m

at

999

kHz)

Signal-to-Noise-Ratio:

50

dB

(at

85

dB/m)

Output

(Level/Impedance):

200

mV/

2.2

kohms

[General]

Power

Requirement:

120

V

AC,

60

Hz

(USA/Canada)

220

V

AC,

50

Hz

(Europe)

240

V

AC,

50

Hz

(UK/Australia)

115/230

V

AC,

50

—

60

Hz

(General

Export)

Power

Consumption:

10

W

Dimensions

(WxHxD):

435

x

82

x

276:

mm

Weight

(net):

2.9

kg

Accessory:

300/75

ohm

Matching

Trans-

former

(Europe/UK

only),

T-bar

FM

Antenna,

AM

Loop

Antenna,

RCA

pin

plug

Cord,

Owner's

Manual

*}mprovements

may

result

in

specification

or

feature

changing

without

notice.

Distortion

Meter

.

FM

Discrminator

Adjustment

.

Set

the

tuner

to

its

FM

position.

.

Tune

the

tuner

to

a

98

MHz

frequency

and

load

this

into

any

preset

station

memory.

.

Keep

the

tuner

available

to

receive

the

frequency

of

98

MHz.

.

Switch

the

FM

Signal

Generator

so

that

the

tuner

is

fed

with

this

signal

:

mono

carrier

of

98

MHz,

modulating

frequency

of

1

kHz,

modulation

rate

of

100%

(75

kHz

dev.),

at

a-level

of

65

dBf.

;

‘Adjust

T21

until

the

DC

voltmeter

connected

between

TP-2

and

TP-3

reads

0

V

+/-1

mV.

.

Switch

the

filter

box

to

select

a

200-15,000

Hz

band

pass

filter

(BPF),

and

check

for

0.6%

THD

or

less

as

read

on

the

distortion

meter.

.

TUNED

LED

Lighting

Level

Adjustment

1.

The

tuner

shall

be

tuned

to

98

MHz

as

before.

.

Switch

the

FM

Signal

Generator

so

that

the

tuner

is

fed

with

this

signal

:

carrier

of

98

MHz,

modulating

frequency

of

1

kHz,

modulation

rate

of

100%

(75

kHz

dev.),

at

a

25

dB

level.

.

Adjust

VR21

until

the

TUNED

indicator

lights.

FX3000

3.

IF

Coil

Adjustment

(only

when

THD

is

out

of

specs}

1.

Make

sure

that

the

tuner

is

set

for

98

MHz.

2.

Switch

the

MXP

Modulator

so

that

it

sends

out

a

pilot

signal

at

a

9%

modulation

rate

(6.75

kHz

dev.)

and

a

tone

of

1

kHz

modulating

frequency

at

a

91

%

modulation

rate

(68.25

kHz

dev.},

and

that

the

tuner

is

fed

through

the

FM

Signal

Generator

with

a

98

MHz

carrier

at

a

65

dBf

level.

3.

Switch

the

MXP

Modulator

so

that

its

tone

output

is

L=-R.

4.

Set

the

tuner

to

its

FM

AUTO

reception

mode

and

check

for

the

presence

of

signal

at

the

tuner's

outputs.

Check

also

that

the

STEREO

indicator

lights

up.

“5.

Switch

the

filter

box

to

select

a

200-15,000

Hz

BPF,

and

check

for

less

than

0.7

%

THD

as

seen

on

the

distortion

meter.

Note

:

!f

THD

is

more

than

0.7

%,

correct

it

by

turning

the

IF

Coil

on

the

Front

End

PCB

within

the

limits

of

a

1/3

turn.

Caution

:

The

IF

coil

has

correctly

been

adjusted

before

shipped.

Adjustment

of

the

coil

affects

the

characteristic

of

other

devises.

Do

not

touch

the

coil

unless

THD

is

known

to

be

worse

than

0.7%.

CAUTION:

Never

touch

these

parts.

(They

are

for

use

in

the

process

of

production

only.)

VRIt

®

&

MAIN

PCB

Ti2

Ko

Tis

Adjustment

points

FX3000

AM

TEST

CONNECTIONS

60

cm

Loop

ANT.

or

|

ANT

Service

|_

Tool

™

'

1

8

.

Connect

test

equipment

as

shown

in

diagram

(DC

voltmeter

shall

be

connected

between

TP-1

and

GND

on

the

Main

PCB).

1.

Tracking

Adjustment

1.

Set

the

tuner

to

its

AM

position.

2.

Load

AM

Band

Edge

Frequencies

(the

lower

frequency

is

522

or

580

kHz

and

the

upper

is

1611

or

1710

kHz)

into

any

preset

station

memories.

3.

Recall

from

memory

the

lower

frequency

of

522

kHz

(or

530

kHz),

and

adjust

T12

(oscillator

coil)

for

1

V

+/-0.1

as

seen

on

the

DC

voltmeter.

4.

Recall

from

memory

the

upper

frequency

of

1611

kHz

(or

1710

kHz),

and

adjust

TC12

for

8

V+/-0.2

V

as

seen

on

the

DC

voltmeter.

5.

Asa

result

of

step

4,

the

adjustment

achieved

in

step

3

has

been

upset

;

so

repeat

step

3.

Connections

on

the

Main

PCB

inside

the

tuner

47k

Q

Dummy

Load

.

As

a

result

of

step

5,

the

adjustment

achieved

in

step

4

has

been

upset

;

so

repeat

step

4.

.

Repeat

steps

5

and

6

two

or

three

times

until

the

DC

voltmeter

reading

settles

down

to

1

V

+/-0.1

V

for

the

lower

frequency

and

8

V

+/-0.2

V

for

the

upper

frequency.

.

Sensitivity

Adjustment

.

Load

into

any

preset

station

memories

these

AM

frequencies

:

603

kHz

(or

600

kHz},

999

kHz

(or

1000

kHz),

and

1404

kHz

(or

1400

kHz).

.

Recall

the

AM.

603

kHz

(or

600

kHz)

frequency

from

memory,

and

switch

the

AM

Signal

Generator

so

that

the

tuner

is

fed

with

this

signa!

:

carrier

frequency

of

603

kHz

(or

600

kHz),

modulating

frequency

of

400

Hz,

amplitude

modulation

rate

of

30

%,

at

a

55

dB/m

antenna

input

level.

.

Adjust

T11

(Antenna

Coil)

for

maximum

output

voltage

(waveform)

from

the

tuner.

.

Recall

the

AM

1404

kHz

(or

1400

kHz)

and

set

the

AM

Signal

Generator

so

that

the

tuner

is

fed

with

this

signal

:

carrier

of

1404

kHz

(or

1400

kHz),

modulating

frequency

of

400

Hz,

amplitude

modulation

rate

of

30

%,

at

a

55

dB/m

antenna

input

level.

.

Adjust

TC11

for

maximum

output

voltage

(waveform)

from

the

tuner.

.

Asa

result

of

step

5,

the

adjustment

achieved

in

step

3

has

been

upset

;

so

repeat

steps

2

and

3.

.

Asa

result

of

step

6,

the

adjustment

achieved

in

step

5

has

been

upset

;

so

repeat

steps

4

and

5.

.

Repeat

steps

6

and

7

two

or

three

times

until

both

603

kHz

(or

600

kHz}

and

1404

kHz

(or

1400

kHz)

frequencies

provide

maximum

output

voltage

(waveform)

at

the

tuner's

outputs.

FX3000

.

LF.

Adjustment

.

Recall

the

frequency

of

999

kHz

(or

1000

kHz)

from

memory,

and

switch

the

AM

Signal

Generator

so

that

the

tuner

is

fed

with

this

signal

:

carrier

of

999

kHz

(or

1000

kHz),

modulating

frequency

of

400

Hz,

amplitude

modulation

rate

of

30

%,

at

a

55

dB/m

antenna

input

level.

.

Adjust

T13

for

maximum

output

voltage

(waveform)

from

the

tuner.

.

TUNED

LED

Lighting

Level

Adjustment

.

Recall

the

frequency

of

999

kHz

(or

1000

kHz)

from

memory,

and

switch

the

AM

Signa!

Generator

so

that

the

tuner

is

fed

with

this

signal

:

carrier

of

999

kHz

(or

1000

kHz),

modulating

frequency

of

400

Hz,

amplitude

modulation

rate

of

30

%,

at

a

65

dB/m

antenna

input

level.

.

Adjust

VR11

until

the

TUNED

indicator

lights.

CAUTION:

Never

touch

these

parts.

(They

are

for

use

in

the

process

of

production

only.)

VRit

®

®

MAIN

PCB

Ko

T13

Adjustment

points

TX

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5.

EXPLODED

VIEW

AND

PARTS

LISTS

EXPLODED

VIEW

10