Fisher Mt-250 User manual

Se

ee

oo

ee

134.093

40

(MT-250)

134093

41

(MT-1250)

WM-17146

CONTENTS

Arm

Feed

Cord

Stringing

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Cabinet

&

Chassis

Exploded

View

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

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Cabinet

&

Chassis

Parts

List

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Circuit

Board

(Bottom

View)

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cited

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tnd

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re

cotta

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teases

9,10,11

P.C.

Board

Paris

List

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Semiconductor

Lead

Identification

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

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Point

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Point

Wiring

Diagram

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Schematic

Diagram:

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tees

17,18

IC

Signal

Flow

&

Equivalent

Circuit

........

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19

ARM

FEED

CORD

STRINGING

Unit

Plate

Assy

Rail

_—

a

-

hig

_»®

Tie

the

wire

with

the

spring

Rotate

twice

so

as

to

be

extended.

Remove

the

frame

of

rail

and

pull

it

out

from

the

Unit

Plate

Assy,

then

lift

the

assy.

Follow

as

illustrated.

Ne

-

SPECIFICATIONS

Motor

DC

Servo

Drive

System

;

Beit

Wow

and

Flutter

(WRMS)

0.035

%

Rumble

(DIN

45539B)

—70dB

-

Speed

Variation

+1.5%

Platter

Diameter

296

mm

Y

Record

Speed

Selector

:

33-1/3

rpm

/

45

rpm

Automatic

Functions

es

Yes

e

ails

Automatic

Tonearm

Return

at

End

of

Record

Yes

|

Yes

Manual

Functions

Tonearm

Data

Resonance

Effective

Length

|

130mm

re

ee

Power

Requirements

AC

220V

50Hz

Because

its

products

are

subject

to

continuous

improvement,

Fisher

Corporation

reserves

the

right

to

modify

product

designs

and

specifications

without

notice

and

without

incurring

any

obligation.

CABINET

&

CHASSIS

EXPLODED

VIEW

CABINET

&

CHASSIS

EXPLODED

VIEW

(continued)

Ref.

No.

ONOAahwon

=

ae

ee

ee ee

ea

omnrbhwnr-

—~

©

_

CABINET

&

CHASSIS

PARTS

LIST

PRODUCT

SAFETY

NOTICE

Each

precaution

in

this

manual

should

be

followed

during

servicing.

Components

identified

with

the

IEC

symbol

A\

in

the

parts

list

and

the

schematic

diagram

designate

components

in

which

safety

can

be

of

special

significance.

When

replacing

a

component

identified

with

A\,

use

only

the

replacement

parts

designated,

or

parts

with

the

same

ratings

of

resistance,

wattage

or

voltage

that

are

designated

in

the

parts

list

in

this

manual.

Leakage-current

or

resistance

measurements

must

be

made

to

determine

that

exposed

parts

are

acceptably

insulated

from

the

supply

circuit

before

returning

the

product

to

the

customer.

Part

No.

Description

Q’ty

net

Part

No.

Description

PACKAGE

17

141-2-4459-37900

Pad

Lid

131-6-3069-17050

Patching

Sheet

2

18

141-2-4459-41600

Cushion

Trans

131-6-9439-00400

Ribbon

2

19

141-2-8559-06505

Spring

Mounting

131-6-9459-00300

|

Rubber

Band

1

20

131-2-4201-21100

Screw

134-2-2104-12700

|

Screw

Transit

©

1

21

131-2-4201-19501

Screw,

Button

Hd.

Tapping

141-6-1189-18400

BOX

Corrugate-exp

(MT-250)

1

22

131-2-4201-19503

Screw,

Button

Hd.

Tapping

141-6-1189-18401

BOX

Corrugate-exp

(MT-1250)

1

23

131-2-4201-19502

Screw,

Button

Hd.

Tapping

141-6-2519-19490

BAG

Polyethylene-exp

1

24

131

-2-4203-84233

Washer

141-6-2519-20990

BAG

Polyethylene-exp

1

25

131-0-3020-11000

Pully

Assy

141-6-3119-23401

Pad

(Mat

Turntable)

1

26

131-2-4112-10200

Rope

141-6-3119-28500

Pad

Front

1

27

141-0-5519-10301

|

Worm

Assy

141-6-3119-28600

Pad

Rear

1

28

141-2-1259-09300

Plate

Bottom

(Mechanism)

141-6-3119-28700

Pad

Pick-up

1

29

141-2-3169-28800

Guide

Frame

141-6-3119-32200

—

Pad

(Plate

Bottom)

1

30

141-2-4459-39500

Cushion

141-6-3319-13200

Spacer

3

31

141-2-4459-40100

Cushion

141-6-4159-00639

Notes

1

32

141-2-5289-01700

Rail

141-6-4559-04035

—

Serial

NO.

Sheet

2

33

141-2-5519-65000

|

Worm

Wheel(D)

34

141-2-5649-25000

Belt

35

141-2-5739-07600

Support

Shaft

ACCESSORIES

36

141-2-7519-75700

CAM

.

131-6-2719-10401

BAG

FAN

1

37

141-2-8519-01800

Spring

Rewind

Roller

134-2-2901-11601

Adapter

EP

1

38

141-2-8549-37600.

Spring

142-6-4119-33015

|

Explanatory

Booklet

(MT-250)

1

39

134-2-4106-27002

Shaft

142-6-4119-33087

Explanatory

Booklet

(MT-1250)

1

40

131

-2-4220-10507

Ring

Snap

;

4

134-2-6102-15702

|

MAT

Turntable

‘

42

134-2-6302-11601

Belt

CABINET

43

141-0-7519-05000

Shaft

TT

Complete

4-2359-79863

Connector

4P

Assy

[CN4]

1

44

141-2-3519-80000

Plate

Shaft

TT.

4-2359-79252

Connector

3P

Assy

[CN5]

1

45

141-2-5229-00200

Turntable

4-2439-73040

Wire

2

Parallel

(Arm

Motor)

1

46

131-2-4201-23703

.

Screw

131-2-1310-34663

Name

Plate

(MT-250)

1

47

141-2-4569-09900.

Washer

131-2-1310-34665

Name

Plate

(MT-1250)

1

48

131-2-4203-84235

~

Washer

141-2-4459-40400

Cushion

(Plate

Bottom)

1

49

141-0-3129-02500

Unit

Plate

Assy

141-2-4729-07100

|

Wire

Band

~

12

50

141-0-6419-02401

Pick-up

Assy

141-6-4559-04035

—

Serial

NO.

Sheet

1

50-1

4-1579-70200.

Stylus(ST-103SD)

141-6-4729-37686

Stylus

Label

1

50-2

—

141-0-6419-02500

Tone

Arm

Assy

131-2-3608-16800

Cramp

Wire

1

4-1579-70190.

Cartridge(MG-103S)

134-2-4201-13400

Screw

4

141-2-6419-00500

.

Tone

Arm

134-2-4201-13600

Screw

3

50-3.

—

141-2-3519-82100

-

Cover

134-2-5202-11800

|

Rubber

Cushion

3

50-4

141-2-6459-00600

Retainer

Needle

141-0-1619-35700

Knob

Assy

1

51

141-0-7439-19400

Lifter

Arm

Assy

141-0-2519-00800

Hinge

Assy

2

52

141-2-1149-50700

Cover

Plate

141-2-1129-52400

Cabinet

4

53

141-2-5729-22700

Boss

141-2-1149-46700

Cover

1

54

141-2-8549-32600

Spring

141-2-1249-49900

:.

Lid

1

55

141-2-8559-14700

Spring

141-2-1259-10500

Plate

Bottom

1

56

131-2-4202-11600

Nut

141-2-1439-15801

Panel

Control

(MT-250)

1

57

141-2-4569-04300

Washer

141-2-1439-15802

-

Panel

Controt

(MT-1250)

1

58

4-2369-75370

Plug

Cord

RCA

141-2-1439-15901

Panel

Control

1

59

A\

4-2432-00502

Power

Cord

141-2-1439-16001

Panel

Control

1

60

A\

4-2512-30521

Power

Trans

[T1]

141-2-1649-38800

Knob

1

61

4-2649-70790

—-

Solenoid

[SL1]

141-2-1659-51600

Knob

1

62

—

134-0-5011-04400

—_

Motor

Assy

(Arm)

[M2]

141-2-4459-37602

Cushion

4

63

134-0-5011-04500

Motor

Assy

(Phono)

[M1]

Q

~

<

=

Ee

arr

Cor

aR

Cn

OE

OC

OR SO

Cn

OS

CO

CC

I

SOY

CEO

DOS

COUT

CRESS

CR

OC

CO

OC

CO

EC

CO

CE

Ca

SC

CU

ON,

os

Cr

CC

CS

SC

C.BOARD

(BOTTOM

VIEW)

CONTROL

P.

°

e

&

a

©

a

a ¢

PLAY/STOP

$8

I7cem

s7

30cm

sé

REPEAT

CUEING

$4

PLAY/STOP

$2

SYMBOL

No.

TRANSISTOR

DC

VOLTAGES

SYMBOL

No.

|

a9

|

ato

DEVICE

Ss

=z

=

Oo

ca

=

—

”

CABINET

&

CHASSIS

PARTS

LIST

(continued)

pet

Part

No.

Description

Q'ty

71

141-0-1939-17560

Sensor

P.C.B.

Assy

1

72

141-0-1939-17450

LED

P.C.B.

Assy

1

73

141-0-1939-17550

Primary

P.C:B.

Assy

1

74

141-0-1939-17430

Control

P.C.B.

Assy

1

75

141-0-1939-17440

Power

Switch

P.C.B.

Assy

1

81

106-3-1304-00011

Hex.

Nut-3,

M4.0

1

82

110-3-2104-00011

Spring

Washer-2,

M4.0

1

83

143-3-1703-00811

Screw,

Bind

Hd.

Tapping-B,

+M3.0x8

2

NOTES:

1.

Parts

order

must

contain

Model

Number,

Part

Number

and

Description.

2.

Ordering

quantity

of

screws

and

resistors

must

be

multiple

of

10

pes.

-7-

PRODUCT

SAFETY

NOTICE

Each

precaution

in

this

manual

should

be

followed

during

servicing.

Components

identified

with

the

IEC

symbol

A\

in

the

parts

list

and

the

schematic

diagram

designate

components

in

which

safety

can

be

of

special

significance.

When

replacing

a

component

identified

with

A\,

use

only

the

replacement

parts

designated,

or

parts

with

the

same

ratings

of

resistance,

wattage

or

voltage

that

are

designated

in

the

parts

list

in

this

manual.

Leakage-current

or

resistance

measurements

must

be

made

to

determine

that

exposed

parts

are

acceptably

insulated

from

the

supply

circuit

before

returning

the

product

to

the

customer.

TURNTABLE

ADJUSTMENT

BEFORE

ATTEMPTING

ADJUSTMENT

3.

1.

Adjustments

through

the

rear

of

the

cabinet

should

be

carried

out

from

the

bottom

with

the

cabinet

placed

firmly

on

a

level

base.

2.

Carry

out

adjustment

procedures

in

the

order

given

here.

MEASURING

INSTRUMENTS

REQUIRED

e@

Stroboscope

Sheet

@

DCVTVM

(DC

voltmeter

with

high

impedance)

1.

e

Screw

driver

STYLUS

HEIGHT

ADJUSTMENT

2.

1.

Remove

the

turntable

mat

and

belt

and

turn

the

power

on.

2.

Press

the

<j

button

and

move

the

tone

arm

so

that

the

stylus

'

height

adjustment

screw

can

be

seen

in

the

turntable

aperture

(see

Fig.1).

3.

Turn

the

adjustment

screw

so

that

the

stylus

height

is

7.5mm

from

the

turntable

(it

is

best

to

use

some

instrument

like

that

depicted

in

Fig.2).

5.

Set

the

SPEED

switch

to

33

rpm

and

carry

out

the

same

procedure

with

VR3.

NOTE:

Always

carry

out

this

adjustment

by

adjusting

the

45

rpm

speed

first.

ARM

FEED

PHOTOINTERRUPTER

SENSITIVITY

ADJUSTMENT

Pless

the

<]

button

and

move

the

tone

arm

so

that

the

VR1

on

the

Sensor

PCB

can

be

seen

in

the

turntable

aperture.

Then

fully

turn

the

VR1

counter-clockwise.

Place

a

minimally

de-centered

record

disk

on

the

turntable

and

playback.

When

the

turntable

has

completed

at

least

5

revolutions

after

the

needle

has

dropped

on

to

the

recoad,

pless

the

CUEING

button

and

lift

the

tone

arm.

At

this

point,

adjust

VR1

on the

Control

PCB

so

that

the

arm

rises

straight

up

(see

Fig.4).

If

the

adjusting

range

of

VR1

is

limited

and

it

is

hard

to

adjust,

turn

the

VR1

on

the

Sensor

PCB

clockwise

a

little

and

adjust

again.

FRONT

(Bottom

View)

Stylus

Height

Adjustment

Screw

®

Arm

Feed

Adjustment

Volume

(VR1

=e

Fig.1

°

=)

Cartridge

Prepare

a

piece

of

Fig.4

7.5mm

section

paper

or

a

film

Turntable

LEAD-IN

ADJUSTMENT

1.

Place

a

record

on

the

turntable

and

press

the

PLAY/STOP

button

to

begin

lead-in.

Fig.2

2.

Turn

the

adjustment

cam

so

that

lead-in

attains

the

proper

position

(see

Fig.5).

(Rotating

the

cam

clockwise

moves

the

ROTATION

ADJUSTMENT

lead-in

in

toward

the

center,

while

rotating

it

counter-

1.

Replace

the

belt

and

turntable

mat

and

set

the

SPEED

switch

to

45

rpm.

2.

Using

a

stroboscope

sheet,

adjust

VR2

on

the

Control

PCB

so

that

the

rotation

matches

up

(see

Fig.3).

FRONT

(Bottom

View)

;

Rotation

Adjustment

Volume,

33rpm

(VR8)

Rotation

Adjustment

Volume,

45rpm

(VR2)

‘NY

e

Fig.3

clockwise

moves

it

out

towards

the

edge.)

Lead-in

Position

Adjustment

Cam

(Bottom

View)

REAR

Fig.5

LED

P.C.BOARD

(BOTTOM

VIEW)

SENSOR

P.C.BOARD

POWER

SWITCH

P.C.BOARD

(BOTTOM

VIEW)

.

(BOTTOM

VIEW)

4

@

O-AP6

PELL-MLy

POWER

SWITCH

-11-

Ref.

No.

a

72

CN3

D1

D2

D3

D5

73

74

CNi

Part

No.

P.C.BOARD

PARTS

LIST

Description

SENSOR

P.C.B.

ASSY

141-0-1939-17560

141-2-3519-76200

4-2359-79022

212-5-4390-13510

4-2039-72581

4-2039-72570

4-2229-75541

401

021

1906

Sensor

P.C.B.

Assy

Spacer

Connector

7P

Assy

Diode,

DS

135

;

Photo

Interrupter,

SPI-206-10

Photo

Transister,

TPS-613

Potentiometer

(B-2KQ)

CARBON

560

JA

1/4W

LED

P.C.B.

ASSY

141-0-1939-17450

4-2359-79803

4-2029-75040

PRIMARY

P.C.B.

141-0-1939-17550

4-2372-00830

111-2-6220-11100

LED

P.C.B.

Assy

Connector

5P

Assy

LED,

SLR

34

VC

3

LED,

SLR

34.

VC

3

LED,

SLR

34

VC

3

LED,

SLR

34VC

3

LED,

SLR

34

VC

3

ASSY

Primary

P.C.B.

Assy

EC

Terminal

1P

Wire

Wrap

Terminal

CONTROL

P.C.B.

ASSY

141-0-1939-17430

AM

4-2352-00200

4-2359-78508

101-3-1303-00611

131-2-6201-35500

141-2-3519-75200

131-2-9800-01071

4-2369-22740

4-2369-22750

4-2369-73674

4-2369-71571

4-2369-73670

A\

4-2349-20400

A\

4-2349-20400

4-2319-78290

4-2319-75790

4-2532-00540

4-2532-00150

4-2259-70780

204-5-9000-05000

4-2229-01040

4-2222-01400

4-2229-01400

202-5-2810-44210

4-2029-75030

4-2029-75020

4-2029-75030

Control

P.C.B.

Assy

Fuse

Holder

Connector

1P

Assy

Screw,

Pan

Hd.,

+M3.0x6

Plate

Heat

Sink

(for

1C4,

1C5)

Spacer

Jumper

(To

Power

Switch

P.C.B.)

Plug

5P

Plug

7P

Plug

5P

Plug

4P

Plug

3P

Fuse

(T630mA)

Fuse

(T630mA)

Switch

Slide

(Speed)

Touch

Switch

(Play/Stop)

Touch

Switch

(>

)

Touch

Switch

(Cueing)

Touch

Switch

(<1)

Touch

Switch

(Repeat)

Touch

Switch

(30)

Touch

Switch

(17)

Choke

Coil

(47H)

Choke

Coil

(10/4H)

Choke

Coil

(10,4H)

CSB

800K

Thermistor,

SDT

500

Semi

Fixed

Volume

(B-20kQ)

Potentiometer

(B-10kQ)

Potentiometer

(B-10kQ)

Diode,

DS

442

Diode,

DS

442

LED,

SLP

960

C

(33)

LED,

SLP

960

C

(45)

LED,

SLP

260

CU

(Repeat)

LED,

SLP

960

C

(30)

O’ty

hag

Part

No.

Description

Q'ty

07

4-2029-75030

LED,

SLP

960

C

(17)

1

D8

202-5-3210-05613

Zener

Diode,

GZA5.6Z

1

D9

202-5-3210-05113

Zener

Diode,

GZA5.1Z

1

D10

202-5-2810-44210

Diode,

DS

442

1

D1

202-5-0220-01010

Diode,

DSF

10C

1

Di2

DGG--wW02----

_

Diode,

W02

1

IC1

218-5-0436-41619

—

1C,_LM6416E-1971

1

Ic2

206-5-2726-45810

iC,

LA6458

DS

1

IC3

4-2069-75300

IC,

MN

4049B

1

or

4-2069-72530

iC,

MSM

4049

RS

1

IC4

4-2069-72560

1C,

NJM

7812

1

Ic5

4-2069-72570

1C,NJM

7912

1

a1

203-5-4921-01280

_

Transistor,

2SD

1012

1

Q2

203-5-4921-01280

Transistor,

2SD

1012

1

Q3

203-5-5000-53660

—‘

Transistor,

2SC

536

1

04

203-5-7230-60860

Transistor,

2SA

608

1

Q5

203-5-7230-60860

Transistor,

2SA

608

1

Q6

203-5-7252-27460

Transistor,

2SC

2274

1

Q7

203-5-7252-27460

Transistor,

2SC

2274

1

a8

203-5-7252-27460

Transistor,

2SC

2274

1

Q9

203-5-6820-98460

Transistor,

2SA

984

1

Q10

203-5-5000-53670

Transistor,

2SC

536

1

Qi

203-5-7252-27460

Transistor,

2SC

2274

1

2

Q12

203-5-5000-53660

—‘

Transistor,

2SC

536

1

2

Q13

203-5-7252-27460

Transistor,

2SC

2274

1

C1

CD4-7-6100-0001V

—_

Electrolytic

47u4F

=

10V

1

C2

Cl1-0-3250-MFOOR

Boundary

O.01mMF

25V

+20%

1

:

C3

ClH1-0-3250-MFOOR

=

Boundary

O.01uF

25V

+20%

1

C4

ClH-0-3250-MFOOR

=

Boundary

0.01mMF

25V

+20%

1

4

-

c5

CC3-3-1250-KEOOR

Ceramic

330pF

=25V

+£10%

1

C6

CC1-0-2500-KEOOR

Ceramic

0.001K@F

50V

+10%

1

2

C7

CC2-2-1500-KD00C

Ceramic

220pF

50V

+10%

1

2

C8

CC2-2-1500-KD00C

Ceramic

220pF.

50V

+10%

1

cg

CC1-0-3501-YEYOC

—

Ceramic

0.01@F

500V

+100,-0%

1

C10

Cl4-7-3250-KF00C

Boundary

0.0474F

25V

+10%

1

C11

Cl4-7-3250-KF00C

Boundary

0.0474F

26V

+10%

1

C12.

=

CD4-7-6100-0001V

—_Electrolytic

47uF

6

10V

1

C13

Cl4-7-3250-KF00C

Boundary

0.0474F

25V

+10%

1

C14

Cl4-7-3250-KF00C

Boundary

0.047uF

25V

+10%

1

C15

=

€D1-0-7160-0006V

—_

Electrolytic

100@F

=616V

1

C16

=

CD1-0-7160-0006V.

—_

Electrolytic

100uF

16V

1

C17

CC1-0-3500-ZG00C

Ceramic

0.01HF

50V

+80,-20%

1

C18

=

CC1-0-3500-ZG00C

Ceramic

0.01MF

50V

+80,-20%

1

C19

4-2239-71360

Electrolytic

1000uF

25V

1

€20

CD4-7-7250-0006V

_

Electrolytic

470uF

=.

25V

1

C21

CD1-0-6160-0001V

—_Electrolytic

10uF

16V

1

C22

CD4-7-5500-0001V

_—_

Electrolytic

47uF

50V

1

C23

Ci4-7-3250-KF00C

—

Boundary

0.0474F

25V

+10%

1

R1

401

0163808

CARBON

2.2K

JA1/4W

1

R2

401

0163809

CARBON

2.2K

JA

1/4W

1

R3

401

023

2802

CARBON

8.2K

JA

1/4W

1

R4

401

0163809

CARBON

2.2K

JA1/4W

1

R5

4010127009

CARBON

10K

JA1/4W

1

R6

4010127009

CARBON

10K

JA

1/4W

1

R7

4010127009

CARBON

10K

JA1/4W

-

1

R8

401

020

2904

CARBON

47K

JA

1/4W

1

RQ

4-2219-71580

—

Resistor

(5.6KQ

x5)

1

R10

4010195800

CARBON

4.7

JA1/4W

1

R11

401

021

3009

CARBON

5.6K

JA

1/4W

1

R12

401

021

3009

CARBON

5.6K

JA

1/4W

1

R13

4010127009

CARBON

10K

JA1/4W

1

R14

4010127009

CARBON

10K

JA

1/4W

1

R15

401

021

3009

+

CARBON

5.6K

JA

1/4W

1

R16

401

021

3009

CARBON

5.6K

JA

1/4W

1

|

ary

N

I

Fisher MT-250 User manual

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