JVC MF-33L Bedienungsanleitung

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1

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JVC

MODEL

MF-33L/ML

SUN

Taller

eMUSIC-

SYSTEM

No.

7020

May

1978

MF-33L/ML

|

Contents

Page

Cautions

for

Safety

Assurance

at

the

Service

.......

2

Specifications...

2...

0.0020

c

cee

eee

eee

3

F@aturres:

eco

dese

ea

eilee

se

wt

Be

a

ee

can

ee

ta

3

Name

of

External

Parts

and

Internal

Parts

.........

4

Disassembly

Instruction

...........

000.

e

eee

5

Record

Player

Adjustment

..........6..058+00-

6

How

to

Engage

Dial

String

...........

0022

eee

6

How

to

Remove

Cassette

Door...........200005

7

Removal

of

Cassette

Mechanism.

.........002005

7

Check

Point

After

Replacement

of

Rotation

Parts....

7

Head

Replacement

and

Adjustment

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

8

Cassette

Deck

Circuit

Board

Adjustment..........

8

Tuner

Alignment...

0.0...

0.

cee

ee

ee

10

Block

Diagram

....

20...

00.

e

eee

ee

renee

12

Circuit

Board

Diagrams

........

0.0

cc

eee

nee

eenes

13

Tuner

Circuit

Board

2.0.0...

cece

eee

ee

eee

eee

13

Control

Amp.

Circuit

Board

..........2.020000e

14

Cassette

Amp.

Circuit

Board

............0000005

15

NOTE:

Page

Power

Amp.

Circuit

Board

..........0020005

16

Exploded

View

of

Cassette

Mechanism

...........-

17

Exploded

View

of

Record

Player

Mechanism

.......-

18

Service

Parts

List...

0...

cc

te

eee

es

19

Circuit

Board

Parts

..

0...

0.0

cee

eee

19

Unit:

Parts:

5.0

scans

a

eeed

Aeeie

eS

ASA

SS

21

Record

Player

Mechanism

Parts..............-

22

Cassette

Unit

2

occ

iteseccete

et

esiere

Hie

Se

tes

22

Cassette

Mechanism

Parts.

........6+0205085

23

Characteristics

of

Transistors.

..........2000005

24

Transistor

and

IC

Lead

Identification

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

24

Terminal

Voltages

of

Transistor

&1C

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

26

Schematic

Diagram

..........

002 cee

eee

ene

27

Tuner

Circuit...

1.2...

ee

ee

27

Control

Amplifier...

.......00000

eee

eee

27

Cassette

Circuit...

.....

0002:

eee

28

Power

Source

&

Amplifier.

..........

0000005

28

FOR

REPAIR

OF

SPEAKER

BAFFLE

MODEL

BA-33,

PLEASE

REFER

TO

THE

SERVICE

MANUAL

(No.

7021).

Cautions

for

Safety

Assurance

at

the

Service

Cautions

for

safety

assurance

at

the

service

In

order

to

prevent

from

accidents,

like

fire

or

shock

hazard,

please

keep

the

following

points

for

the

safety.

1.

The

parts

marked

with

A\

in

the

list

of

this

manual

are

safety

assurance

parts.

When

replacing

this

kind

of

parts,

make

sure to

use

the

specified

one.

2.

Although

in

case

of

replacing

the

other

kind

of

parts

than

A\

mark,

it is

recommended

to

use

the

parts

listed

in

this

manual

to

keep

appliance

safe

and

reliable.

3.

When

wire

connection

is

made,

solder

the

connecting

part

after

winding

the

wire

round

the

terminal

a

few

turns

in

order

to

prevent

easy

disconnection.

4.

When

replacing

the

parts

in

the

circuit

marked

in

the

schematic

diagrams

use

only

the

listed

parts

in

this

manual.

The

marked

circuit:

ay

5.

The

symbol

mark

OOAW-|

is

showing

a

fusible

resistor,

please

use

the

listed

parts.

6.

The

heat

radiating

parts

(resistor,

transistor,

etc.)

should

be

spaced

enough

from

printed

circuit

board,

plastics

or

another

electrical

parts

to

be

free

from

its

heat.

Some

parts

may

radiate

big

heat

when

transistor

or

circuitry

has

been

damaged.

7.

When

altered

the

working

voltage

or

frequency

of

the

appliance

make

sure

to

specify

it

on

the

appliance

and

its

carton

case.

atin

a

Soldering

No.

7020

Specifications

Cassette

deck

Type

Track

System

Bias

&

Erase

Frequency

Response

Wow

and

Flutter

Signal

to

Noise

Ratio

Amplifier

Type

Music

Power

Tuner

Type

Tuning

Range

Antenna

Sensitivity

for

FM

FM

Stereo

Separation

Features

:

FM

:

Stereo

Cassette

Deck

with

Auto-Stop

:

4-Track,

2-Channel

Stereo

:-AC

Bias

&

AC

Erase

:

30—13,000Hz

(Normal

Tape)

30—15,000Hz

(Chrome

Tape)

:

0.15%

(WRMS)

:

Better

than

50dB

(at

Peak

Level)

without

Dolby

noise

reduction.

The

S/N

ratio

is

improved

by

5dB

at

1kHz

and

10dB

above

5kHz

with

Dolby

noise

reduction

on.

:

IC

Power

Amplifier

with

Bass

and

Treble

Controls

15W

RMS

per

channel

at

8

ohms

:

40W

:

4-Band

(FM/MW/SW/LW)

Stereo

Tuner

88—108MHz

MW

520—1600kHz

SW

6—18MHz

LW

150—350kHz

:

FM

300

ohms

balanced

:4yuV

:

40dB

(1kHz)

15

WATTS

RMS

PER

CHANNEL

POWER

OUTPUT

4-BAND

(FM/MW/SW/LW)

RECEIVER

DOLBY

NOISE

REDUCTION

SYSTEM

AUTO-STOP

STEREO

CASSETTE

DECK

AUTO-RETURN

BELT-DRIVE

TURNTABLE

SPEAKER

SELECTOR

SWITCH

(A,

B,

A

+

B)

MF-33L/ML

Turntable

Type

:

Belt-Drive

Auto-Return

Speeds

:

33-1/3,

45rpm

Platter

:

28cm

(11)

Motor

:

FG

Servo

Motor

Cartridge

:

Moving

Magnet

Stylus

:

Diamond

General

:

110/120/220/240V,

50/60Hz

or

240V,

50/60Hz

Power

Sources

JVC

recommends

a

JVC

2-way

Ajir-Suspension

Speaker

System

with

Passive

Radiator

(Drone

Cone)

Model

BA-33/33M

for

matching

performance

and

appearance

of

your

MF-33L/ML.

No.

7020

MF-33L/ML

Name

of

External

Parts

and

Internal

Parts

219

435

6

23 24

22

Fig.

2

Parts

Name

Parts

No.

Side

Panel

Ass’y

Refer

to

Parts

List

Page

21

17

18

16

151214

13

10

11

9

Dust

Cover

Ass’y

”

Hinge

Ass‘y

Y¥30120-003

Bottom

Case

*¥10082-001

Fig.

1

Speaker

Terminals

*QMB0484-002

Antenna

Terminals

*QMB0484-001

DIN

Socket

Ass’y

*Y00122-001

Voltage

Selector

QSR0074-001

Parts

Name

Parts

Name

1

Front

Panel

Ass‘y

Refer

to

Parts

List

Page

21

Spring

(Knob)

Y40462-001

2

Cassette

Door

Holder

Ass’y

”

Microphone

Jacks

*Y00127-001

3

|

Tape

Counter

TGW291324-0A

Control

Knobs

*¥

4056

1-001

4

|

Tape

Select

Switch

*QSS4201-051(EQ)

Speaker

Select

Knobs

Y40428-001

QSS2201-003(BIAS)

Push

Shaft

Y30264-001

5

Dolby

NR

Switch

QSS4201-051

Headphone

Jack

QMS6302-015

6

Level

Meter

*Y00119-001

Cassette

Grille

Ass’y

Refer

to

Parts

List

Page

21

Lamp

(Meter)

QLP4101-004B

Cassette

Push

Buttons

”

7

|

Dial

Scale

*¥20075-001

Beat

Cut

Switch

*QSS2301-005

8

|

Dial

Needle

*Y40567-001

Power

Switch

Knob

Ass’y

*¥40490-002

Lamp

(Needle)

Y00124-400

Cabinet

Case

Y10063-001

9

|

Tuning

Knob

*Y

40560-001

Player

Mechanism

Refer

to

Parts

List

Page

22

10

|

Push

Switch

Knobs

*Y40562-001

Indicator

TLR114

|

“a

a

—

Parts

Name

Parts

No.

Tuning

Shaft

Ass’y

*Y¥KA40065-002

Dial

Drum

QZD1115-001

Spring

(Drum)

Y40276-002

No.

7020

Tuner

Circuit

Board

Ass'y

Contro!

Circuit

Board

Ass’y

Cassette

Mechanism

Ass’y

Cassette

C.

Board

Ass’y

Power

Switch

C.B.

Ass’y

Power

Amp.

C.B.

Ass‘’y

Antenna

C.B.

Ass’y

Power

Transformer

Power

Cord

Fuse

Refer

to

Parts

List

Page

19

Refer

to

Parts

List

Page

20

Refer

to

Parts

List

Page

23

Refer

to

Parts

List

Page

19

Refer

to

Parts

List

Page

20

"

”

Refer

to

Parts

List

Page

21

——

Disassembly

Instruction

Step

1.

Record

Player

Remove

2

screws

with

motor

board

floated

and

disconnect

2

plugs

from

underside

of

player

board.

U

Fig.

4

Step

3.

"

Cabinet

Case

(Step

2.)

Remove

4

screws.

Fig.

6

Step

5.

Cassette

Mechanism

@

Remove

cassette

door

holder.

(Refer

to

page

7)

©

Remove

4

screws

in

Fig.

8

and

remove

1

screw

of

arrow

mark

Jin

Fig.

7.

Front

Panel

MF-33L/ML

Step

2.

Cabinet

Case

(Step

1.)

Remove

1

screw.

Fig.

Step

4.

ig.

8

Cabinet

Case

(Step

3.)

Remove

both

sides

panels

and

remove

2

screws

of

arrow

mark

4

on

both

sides.

Fig.7

Step

6.

Circuit

Boards

Tuner

Remove

5

screws.

Control

Take

off

the

control

knobs

and

remove

6

screws.

Power

Remove

screws

of

the

speaker

terminals

(A

&

B)

and

remove

6

screws.

Fig.

9

No.

7020

MF-33L/ML

|

Record

Player

Adjustment

Confirmation

of

Normal

Operation

of

Auto

return

Mechanism

When

you

bring

pickup

head

part

to

the

position

of

boss

(A)

while

keeping

the

Lower

Trip

Pawl

pushed

inward

(Arrow

B)

by

hand,

if

pickup

does

not

move

forward,

operation

of

auto

return

mechanism

is

normal.

(Fig.

10)

Adjustment

Screw

Fig.

11

Speed

adjustment

of

turntable

Adjust

two

semi-fixed

resistor

on

the

motor

control

circuit

board

for

each

speed.

45

rpm

:

(A)

33

rpm

:

(B)

in

Fig.

12

Fig.

10

Lead-out

adjustment

After

replacing

cartridge

or

lead-out

mechanism

parts,

make

sure

of

normal

operation

of

lead-out.

®

Confirmation

&

Adjustment.

1)

Lead-out

should

be

made

when

playing

JVC

test

record

RG-652

(pitch

3mm).

1f

not,

turn

the

adjusting

screw

(Fig.

11)

counter-

clockwise.

2)

Lead-out

should

not

be

made

when

playing

the

record

RG-653

(Reverse

side

of

RG-652).

If

it

is

made,

turn

the

adjusting

screw

clockwise.

Repeat

above

1)

&

2),

and

fix

the

adjusting

screw

at

the

correct

position

for

normal

lead-out.

Fig.

12

How

to

Engage

Dial

String

1.

Set

the

variable

capacitor

on

maximum.

2.

String

dial

cord

in

numerical

order

as

shown

in

the

arrow

marks.

3.

Overall

length

of

cord

is

655cm.

Fig.

13

No.

7020

How

to

Remove

Cassette

Door

Holder

_

.

Open

the

door

by

depressing

“EJECT”

knob.

2.

Take

off

the

brake

shaft

arm

connected

with

the

door

at

left-hand

of

the

cassette

compartment.

3.

Depress

the

opened

door

toward

you

so

as

to

open

it

further.

Notice:

Check

Point

of

Door

Trouble

If

opening

or

closing

the

door

is

not

smooth,

check

the

following

points.

1.

Whether

the

small

hole

of

brake

pipe

(inside)

is

choking

with

something

like

dust.

2.

Whether

grease

on

brake

shaft

is

running

out.

3.

Whether

“O”

ring

of

the

shaft

is

deforming.

MF-33L/ML

Removal

of

Cassette

Mechanism

For

removing

cassette

mechanism

parts,

do

it

in

the

fol-

lowing

way

referring

to

“Exploded

View

of

Cassette

Mechanism”

on

page

(1)

Regarding

the

parts

to

which

the

belt

is

fitted,

take

off

the

belt

first.

(2)

Regarding

the

parts

to

which

the

spring

is

hooked

up,

take

off

the

spring

first.

(3)

Regarding

the

other

major

parts,

remove

screw

or

“E"'

ring

which

fixes

the

parts

to

be

removed.

CAUTION:

1.

As

for

rotation

parts

such

as

reel

disk

etc.,

pull

it

out

vertically

from

the

shaft.

2.

Be

careful

not

to

soi!

belt

or

rubber

Parts

in

oil

etc.

Check

Point

After

Replacement

of

Rotation

Parts

1.

Pinch

Roller

Pressure

@

It

must

be

within

380~580

g/cm.

@

The

roller

continues

to

rotate

after

being

rotated

by

the

finger.

@

The

roller

surface

contacting

the

capstan

must

be

vertical,

2.

Flywheel

@

A

little

thrust

clearance

exists

between

flywheel!

shaft

bearing

and

special

washer.

@

The

capstan

is

clean,

correctly

centered,

and

provides

quiet

rotation.

3.

Take-up

Torque

It

must

be

within

40~70

g/cm.

If

torque

is

out

of

the

specified

range,

take

the

following

measures.

1)

Clean

take-up

belt,

surfaces

of

idler

and

reel-disc.

2)

Change

the

position

of

the

spring

holder

in

the

clutch

pulley.

(Refer

to

Fig.

14)

3)

Nevertheless,

if

the

standard

torque

is

not

obtained,

replace

take-up

clutch

arm

ass’y.

4.

Fast

Forward

and

Rewind

Torque

The

standard

torque

should

be

over

60

g/cm.

If

the

torque

is

less

than

the

specified

range,

take

the

following

measures.

1)

Clean

take-up

belt,

rubber

part

of

reel-disc,

and

all

parts

to

which

the

belt

gets

in

contact.

2)

Change

the

position

of

the

spring

holder

in

the

F.F.

idler.

(Refer

to

Fig.

14)

3)

Adjust

or

replace

the

springs

concerned.

4)

In

case

the

rubber

parts

was

worn

out,

replace

to

new

one.

F.F.

idler

Clutch

pulley

Fig.

14

Note:

To

adjust

the

spring

holder,

raise

it

up

with

a

screwdriver

and

shift

to

higher

position

by

turning.

The

torque

is

the

higher

the

stronger.

No.

7020

MF-33L/ML

|

Head

Replacement

and

Adjustment

If

either

of

Recording/PB

head

and

Erase

head

shows

low

performance

caused

by

wear,

broken

wire

or

excessive

magnetiza-

tion,

it

should

be

replaced.

They

can

be

removed

by

loosening

screws

with

following

procedure.

After

replacement,

adjust

azimuth

of

head.

Azimuth

Adjustment

Step

1.

2.

3.

Connect

INPUT

jack

of

V.T.V.M.

to

LINE

OUT

of

REC/PB

socket.

Play

back

the

standard

tape

(Full

Track

or

JVC

Test

Tape

VTT658

10kHz)

for

azimuth

(angle

adjustment).

Adjust

screw

Q)

so

that

indication

of

V.T.V.M.

will

become

max.

When

standard

tape

for

azimuth

adjustment

is

not

available,

play

a

music

cassette

tape.

Make

treble

sound

optimum

with

turning

the

screw

.

After

this

adjustment,

the

screw

@®

should

be

locked

with

a

bond.

If

necessary,

adjust

playback

level,

recording

bias

current,

and

trap

etc.

Yad

Erase

Head

©

©

Bae

=

eS

@ ®

@

if

Fig.

15

Cassette

Deck

Circuit

Board

Adjustment

Item

of

Adjustment

arWN—

.

Dolby

Noise

Reduction

Level

.

Level

meter

.

Playback

Gain

.

Recording

bias

current

.

Recording

current

Equipment

and

measuring

instruments

to

be

used

for

adjustment

1.

On

aah

WN

No.

7020

VTVM

(measuring

AC

in

milivolts)

.

Oscilloscope

.

Oscillator

.

Attenuator

.

Frequency

counter

.

Standard

tape

VTT-664

(1kHz

16mM/mm)

.

C-60

Normal

sub-standard

tape

-

100Q

Resistor

R/P

Head

wo

Frequency

counter

1002

AC

milivoltmeter

Fig.

16

—_

.

DOLBY

N.R.

Level

1.

Set

SOURCE

SELECT

switch

to

“AUX”.

2.

Set

DOLBY

N.R.

switch

to

“OFF”.

3.

Set

the

deck

in

recording

mode.

4.

Apply

1kHz

signal

of

proper

level

(0.5V_

ap-

proximately)

to

“AUX”

input

terminal.

.

Adjust

the

front

REC

VOLUME

so

that

the

signal

level

will

be

-25

dBm

at

the

terminals

of

VR401

(L-ch)

and

VR402

(R-ch)

respectively.

(Refer

to

Fig.

17)

6.

Finally

adjust

VR401

and

402

so

that

the

level

will

be

-2.5

dBm

at

the

Dolby

T.P.

(L)

and

(R).

ol

2.

Adjustment

of

Level

Meter

After

adjustment

of

Dolby

Noise

Reduction

Level

was

completed,

adjust

the

VR303

(L)

&

VR304

(R)

so

that

the

level

meter

indicates

Cal

(+3VU).

(Refer

to

Fig.

17)

3.

Playback

level

1.

Set

SOURCE

SELECT

switch

to

“TAPE”.

2.

Set

EQUALIZER

switch

to

“NORMAL”,

3.

Set

DOLBY

N.R

switch

to

“OFF”.

4.

Play

the

reference

tape

VTT-664,

(1kHz),

and

adjust

VR301

(L-ch)

and

VR302

(R-ch)

so

that

the

level

meter

will

indicate

OVU.

4.

Adjustment

of

Recording

bias

and

frequency

1.

Connect

a

resistor

10082

to

the

earth

side

terminal

of

R/P

head

in

recording

state,

and

connect

AC

milivoltmeter

to

the

both

terminals

of

the

resistor.

(Refer

to

Fig.

16)

2.

While

changing

the

bias

switch,

adjust

so

that

the

specified

current

will

be

obtained.

The

adjustment

should

be

made

from

“CHROME”.

.

Bias

Lo

ow

Place

to

be

adjusted

Current

VR307

(L-ch)

550uA

CHROME

|

vR308

(R-ch)

(55mV/1002)

NORMAL

|

VR

309

(L,R-ch)

400uA

(40mV/1002)

3.

Regarding

bias

frequency,

adjust

T301

so

that

57kHz

will

be

obtained

when

the

front

BEAT

CUT

Switch

is

set

to

1.

MF-33L/ML

es

0)

nf

oa

VR402

(s)

vraoi@)

Fig.

17

5.

Adjustment

of

Recording

signal

current

1.

For

this

adjustment,

it

is

necessary

that

the

swing

angle

of

the

level

meter

and

playback

sensitivity

are

correctly

adjusted

previously.

2.

Set

the

equalizer

switch

and

bias

switch

to

“NORMAL”,

3.

In

recording

state,

apply

1kHz

signal

of

proper

level

(0.5V

approximately)

to

“AUX”

input

terminal,

and

adjust

the

front

Recording

volume

so

that

the

level

meter

will

indicate

OVU.

4.

In

this

state,

repeating

the

recording

and

playback,

adjust

VR305

(L-ch)

and

VR306

(R-ch)

until

the

level

meter

indicates

OVU.

Tape

speed

Standard

speed:

3,000Hz

+2%

(at

playing

a

3,000Hz

test

tape)

If

not

as

specified,

insert

your

driver

in

hole

on

the

motor

upside

and

adjust

a

semi-VR

for

speed

control

in

the

motor

case.

(Fig.

17

*

)

No.

7020

MF-33L/ML

|

Tuner

Alignment

AM

IF

&

RF

ALIGNMENT

x

~10kHz

0

10kHz

y,

1

te

x

@

IF

Alignment

mas

Equipment

required

:

455kHz

Sweep

Generator

with

Oscilloscope

}

Input

terminal

:

Ain

Fig.

20

‘

Output

terminal

:

Bin

Fig.

20

@

RF

Alignment

Equipment

required

:

Standard

Signal

Generator

Modulation

1000Hz,

30%

Input

terminal

:

Loop

Antenna

for

LW

and

MW

AM

antenna

terminal

for

SW

Fig.

18

Output

terminal

:

Speaker

terminal

Alignment

point

Set

V.

Capacitor

to

Po4

|

mw

455kHz

CF

103,

T103

|

Center

(IF)

Adjust

CF

103,

T103

Fig.

18

Repeat

the

step

3

&

4

to

get

the

best

point

of

adjustment.

6MHz

L111

6MHz

Repeat

the

step

6

&

7

to

get

the

best

point

of

sensitivity.

510kHz

Maximum

1650kHz

Minimum

Repeat

the

step

9

&

10

to

get

the

best

point

of

adjustment.

1400kHz

C184

1400kHz

Repeat

the

step

12

&

13

to

get

the

best

point

of

sensitivity.

360kHz

C199

Repeat

the

step

15

&

16

to

get

the

best

point

of

adjustment.

160kHz

L112

(LW

Bar

ANT.)

160kHz

350kHz

C181

350kHz

Repeat

the

step

18

&

19

to

get

the

best

point

of

sensitivity.

aa

=

=<

NOTE:

When

bar

antenna

coil

of

MW

or

LW

is

adjusted,

check

the

tracking

error

for

each

band,

because

two

coils

slightly

interfere

each

other.

Always

use

an

insulated

screw

driver

for

adjustment.

Fig.

19

No.

7020

—10-

nen,