JVC MF-33L, MF-33ML User Manual

JVC

MODEL

MF-33L/ML

SUN

Taller

eMUSIC-

SYSTEM

No.

May

7020

1978

MF-33L/ML

Contents

|

Cautions

Specifications...
F@aturres:

Name

Disassembly

Record

How
How
Removal
Check
Head
Cassette

Tuner
Block

Circuit

for

eco

of

External

Player

to

Engage

to

Remove

of

Point

Replacement

Deck

Alignment...
Diagram

Board

Tuner

Circuit
Control
Cassette

Amp.

Safety

dese

Instruction

Adjustment

Cassette

After

Circuit

Diagrams

Amp.

Assurance

2...

Parts

Dial

String

Cassette

Mechanism.

Replacement

and

Board

0.0...

....

20...

Board

Circuit

Circuit

at

the

Service

0.0020 c cee

ea

eilee

se

and

Internal

...........

wt

Be a ee

Parts

eee

000. e eee

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

...........

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

.........002005

of

Rotation

Adjustment

Adjustment..........

00.

........

2.0.0...
Board

Board

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

0.

cee

e

eee

0.0

cc

eee

cece

eee

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

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

.......

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can

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ta

.........

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Parts....

ee

ee

ee

renee

nee

eenes

ee

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Page

2
3
3

4

5

6

6
7
7
7
8
8

10
12

13
13
14
15

Power

Amp.

Exploded

Exploded
Service

Characteristics
Transistor
Terminal

Schematic

View

View

Parts

List...
Circuit
Unit:

Record

Cassette
Cassette

Board

Parts:

Player

Unit 2 occ
Mechanism

and

Voltages

Diagram

Tuner

Circuit...

Control

Cassette

Power

Amplifier...

Circuit...

Source & Amplifier.

Circuit

Board

of

Cassette

of

Record

0...

Parts

..

5.0

scans a eeed

Mechanism

iteseccete
Parts.

of

Transistors.

IC

Lead

Identification

of

Transistor

..........

1.2...

.......00000

.....

..........0020005

Mechanism

Player

cc

0...
Aeeie

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

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

Mechanism

te

eee

0.0

cee

eS

et

esiere

........6+0205085

..........2000005

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

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

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0002:

..........

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ee

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ene

eee

eee

es

ee

Page

tes

16
17

18
19
19
21

22

22
23

24
24
26

27
27

27

28
28

NOTE:
FOR

REPAIR

(No.

7021).

Cautions

Cautions

In

hazard,

1.

2.

3.

for

order

to

please

The

parts

safety

assurance

When

replacing

specified

Although

than

A\

in

this

manual

When

wire

part

after

turns

in

safety

prevent

keep

marked

one.

in

mark,

connection

winding

order

case

to

to

OF

SPEAKER

for

assurance

from

the

following

with

parts.

this

kind

of

replacing

it is

recommended

keep

appliance

the

prevent

BAFFLE

Safety

at

the

service

accidents,

points

A\

in

the

list

of

parts,

make

the

to

safe

is

made,

solder

wire

round

easy

disconnection.

MODEL

Assurance

like

fire

or

shock

for

the

safety.

of

this

manual

sure to

other

use

the

and

reliable.
the

the

terminal a few

kind

of

parts

connecting

use

BA-33,

are

the

parts

listed

PLEASE

4.

When
schematic

manual.

5.

The
please

6.

The

be
or

Some
circuitry
When

7.
appliance

its

a

Soldering

at

replacing

The

symbol

use

heat

spaced

another

parts

altered

carton

REFER

the

the

diagrams

marked

mark

the

listed

radiating

enough

electrical

may

has

been

the

sure

make

case.

TO

THE

SERVICE

Service

parts

in

the

circuit

use

only

the

circuit:

ay

OOAW-|

parts.

parts

from

radiate

damaged.

working

(resistor,

printed

parts

to

specify

to

is

showing a fusible

transistor,

circuit

be

free

heat

big

voltage

it

listed

from

when

frequency

or

the

on

MANUAL

marked

parts

resistor,

etc.)

board,
its

heat.

transistor

appliance

in

the

in

this

should

plastics

or

the

of

and

atin

No.

7020

Specifications

MF-33L/ML

Cassette
Type
Track
Bias & Erase
Frequency
Response

Wow
Signal

Ratio

Amplifier
Type

Music
Tuner

Type

Tuning

Antenna

Sensitivity
FM

Separation

deck

System

and

to

Noise

Power

Range

Stereo

Flutter

for

FM

:
:
:-AC

:

:

:

:

:

:

:

:

:4yuV

:

Stereo

Cassette

4-Track,

30—13,000Hz

2-Channel

Bias & AC

30—15,000Hz

0.15%

(WRMS)

Better

than

without

S/N

and
noise

IC
Treble
at 8 ohms
40W

4-Band

Tuner
FM
MW
SW
LW
FM

40dB

Dolby

ratio

is

10dB

above

reduction

Power

Amplifier

Controls

(FM/MW/SW/LW)

88—108MHz

520—1600kHz

6—18MHz

150—350kHz

300

ohms

(1kHz)

Deck

Stereo

Erase

(Normal

(Chrome

50dB

(at

noise

improved

5kHz

on.

with

15W

balanced

with

Auto-Stop

Tape)

Tape)

Peak

Level)

reduction.

by

5dB

at

with

Dolby

Bass

and

RMS

per

Stereo

The

1kHz

channel

Turntable
Type

Speeds
Platter

Motor

Cartridge

Stylus
General

Power

Sources

JVC

recommends

System

BA-33/33M

your

MF-33L/ML.

with

for

:

Belt-Drive

:

33-1/3,

:

28cm

:

FG

:

Moving

:

Diamond

:

110/120/220/240V,
240V,

a

Passive

matching

Servo

JVC

Radiator

performance

45rpm

(11)

Magnet

50/60Hz

2-way

Auto-Return

Motor

Ajir-Suspension

(Drone

and

50/60Hz

Cone)

appearance

or

Speaker

Model

of

Features

15

WATTS
4-BAND
DOLBY
AUTO-STOP
AUTO-RETURN
SPEAKER

RMS

(FM/MW/SW/LW)

NOISE

SELECTOR

PER

REDUCTION

STEREO

BELT-DRIVE

CHANNEL

RECEIVER

CASSETTE

SWITCH

POWER

SYSTEM

DECK

TURNTABLE

(A,

B, A +

OUTPUT

B)

No.

7020

MF-33L/ML

Name

219

17

18

16

of

435

151214

External

6

13

Fig.

1

Parts

10

11

9

and

Internal

Parts

Name

Side

Panel

Cover

Ass‘y

Case

Terminals

Terminals

Socket

Selector

Ass’y

Ass’y

Ass’y

Dust

Hinge
Bottom

Speaker

Antenna
DIN
Voltage

Parts

23

Fig.

2

24

Parts

Refer

to

Parts

”

Y¥30120-003

*¥10082-001

*QMB0484-002

*QMB0484-001
*Y00122-001

QSR0074-001

No.

List

Page

22

21

1

Front

2

Cassette

3 | Tape

4 | Tape

5

Dolby

6

Level

Lamp
7 | Dial
8 | Dial

Lamp
9 | Tuning

10 | Push

Parts

Panel

Door

Counter

Select

NR

Switch

Meter

(Meter)
Scale
Needle

(Needle)

Knob

Switch

Name

Ass‘y

Holder

Switch

Knobs

Ass’y

Refer

to

Parts

”

TGW291324-0A

*QSS4201-051(EQ)

QSS2201-003(BIAS)
QSS4201-051

*Y00119-001

QLP4101-004B
*¥20075-001
*Y40567-001

Y00124-400
*Y

40560-001

*Y40562-001

“a

List

Page

21

Parts

Spring

(Knob)

Microphone

Control

Knobs

Speaker

Push
Headphone
Cassette

Cassette
Beat
Power
Cabinet
Player

Select

Shaft

Grille

Push

Cut

Switch

Case

Mechanism

Indicator

Tuning
Dial
Spring
Tuner
Contro!
Cassette

Cassette

Power
Power
Antenna
Power
Power

Fuse

Name

Jacks

Knobs

Jack

Ass’y

Buttons

Switch

Knob

a

Parts

Shaft

Drum

(Drum)

Circuit

Circuit

C.

Switch
Amp.

Transformer
Cord

Ass’y

Name

Ass’y

Board

Board

Mechanism

Board

C.B.

C.B.

C.B.

Ass’y

Ass'y

Ass’y

Ass’y

Ass’y

Ass’y

Ass‘’y

Y40462-001

*Y00127-001

*¥

4056

Y40428-001

Y30264-001

QMS6302-015

Refer

to

*QSS2301-005
*¥40490-002

Y10063-001

Refer

to

TLR114

—

*Y¥KA40065-002

QZD1115-001

Y40276-002
Refer
Refer

Refer
Refer

Refer

Refer

1-001

Parts

”

Parts

Parts

to

Parts

to

Parts

to

Parts

to

Parts

to

Parts

to

Parts

List

List

No.

List
List
List
List

List

"

”

List

Page

Page

Page

Page
Page

Page

Page

Page

21

22

|

19
20
23
19

20

21

——

No.

7020

MF-33L/ML

Disassembly

Step

1.

Record
Remove 2 screws

2

Step

Cabinet

Remove 4 screws.

plugs

Player

from

3.

Case

with

underside

U

(Step

2.)

motor

of

Instruction

board

player

floated

board.

and

disconnect

Fig.

4

"

Step

2.

Cabinet

Remove 1 screw.

Step
Cabinet

Remove

mark 4 on

4.

Case

Case

both

both

(Step

(Step

3.)

sides

sides.

1.)

panels

and

remove 2 screws

of

Fig.

ig.

arrow

8

Step

5.

Cassette
@
©

Mechanism
Remove
Remove 4 screws

mark

cassette

Jin

Fig.

door

7.

holder.

in

Fig. 8 and

Fig.

6

(Refer

to

remove 1 screw

page

Front

7)

Panel

of

arrow

Step

6.

Circuit
Tuner
Control

Power

Boards

Remove 5 screws.
Take

screws.

Remove
(A & B)

off

the

control

screws

and

remove 6 screws.

of

knobs

the

and

speaker

Fig.7

remove

terminals

Fig.

6

9

No.

7020

MF-33L/ML

|

Record

Confirmation

Player

of

Normal

Mechanism

When

you

bring

pickup

(A)

while

keeping

(Arrow

operation

Lead-out
After
sure

®

B)

by

of

auto

adjustment

replacing

of

normal

Confirmation & Adjustment.

1)

Lead-out

record

RG-652

1f

not,

clockwise.

2)

Lead-out

record

RG-653

If

it

is

made,

Repeat

correct

above

position

the

hand,

return

cartridge

operation

should

(pitch

turn

the

should

(Reverse

turn

1) & 2),

for

normal

if

adjusting

the

Operation

head

part

Lower

pickup

mechanism

or

lead-out

of

lead-out.

be

made

3mm).

not

be

side

adjusting

and

fix

lead-out.

Adjustment

of

Auto

return

to

the

Trip

does

is

mechanism

when

screw

made

of

screw

the

position

Pawl

pushed

not

move

normal.

playing

(Fig.

when

RG-652).

clockwise.

adjusting

of

forward,

(Fig.

10)

Fig.

parts,

JVC

11)

counter-

playing

screw

boss

inward

10

make

test

the

at

the

Speed
Adjust

board

45

33

adjustment

two

semi-fixed

for

each

speed.

rpm : (A)

rpm : (B)

in

of

Fig.

Fig.

turntable

resistor

12

11

on

Adjustment

the

motor

Screw

control

circuit

How

to

Engage

Dial

String

1.

Set

the

variable

2.

String

dial

cord

3.

Overall

length

capacitor
in

numerical

of

cord

on

is

655cm.

Fig.

13

maximum.
order

as

Fig.

shown

12

in

the

arrow

marks.

No.

7020

MF-33L/ML

How

to

Cassette

_

.

Open

the

door

2.

Take

off

the

brake

left-hand

3.

Depress
further.

Notice:

1.

Whether

with

2.

Whether

3.

Whether

of

the

the

Check

Point

If

opening

check

the

the

something

grease

“O”

opened

small

Remove

Door

by

depressing

shaft

cassette

door

of

Door

or

closing

following

hole

like

dust.

on

brake

ring

of

the

Holder

“EJECT”

arm

connected

compartment.

toward

Trouble

points.

of

brake

shaft

shaft

you

the

door

pipe

is

running

is

deforming.

knob.

with

the

so

as

to

is

not

(inside)

is

out.

door

at

open

smooth,

choking

it

Removal
Mechanism

For

removing

lowing

Mechanism”

(1)

Regarding

the

off

(2)

Regarding

take

(3)

Regarding

“E"'

CAUTION:

1.

As

for

vertically

2.

Be

careful

way

on

belt

off

the

ring

which

rotation

from

not

cassette

referring

page

the

first.

the

spring

the

the

to

parts

parts

other

fixes

parts

shaft.

soi!

of

Cassette

mechanism

to

“Exploded

to

which

to

which

first.

major

the

parts

such

as

belt

or

rubber

parts,

the

the

spring

parts,

to

be

reel

disk

Parts

do

it

View

belt

is

is

remove

removed.

etc.,

in

oil

in

the

of

Cassette

fitted,

hooked

screw

pull

it

etc.

fol-

take

up,

or

out

Check

1.

Pinch

@
@

@

2.

Flywheel

@ A little

@

3.

Take-up

It

If

measures.

1)

2)

3)

Roller

It

must

The

roller

the

finger.
The
vertical,

bearing

The

capstan

quiet

must

be

torque

Clean

Change

pulley.

Nevertheless,
replace

Point

Pressure

be

within

continues

roller

surface

thrust

and

special

is

rotation.

Torque

within

is

out

of

take-up

the

position

(Refer

take-up

380~580

contacting

clearance

washer.

clean,

40~70

the

specified

belt,

surfaces

of

Fig.

to

if

the

standard

clutch

After

g/cm.

to

rotate

exists

correctly

g/cm.

range,

of

the

spring

14)

arm

ass’y.

after

the

capstan

between

centered,

take

idler

and

holder

torque

Replacement

being

rotated

flywheel!

and

the

reel-disc.

in

the

is

not

obtained,

by

must

be

shaft

provides

following

clutch

4.

Fast
The

If

the

following

1)

Clean

parts

2)

Change

idler.

3)

Adjust

4)

In

one.

Clutch

of

Forward

standard

case

torque

measures.

take-up

to

which
the

(Refer

or

replace

the

pulley

torque

Rotation

and

is

less

belt,

the

position

to

Fig.

the

rubber

Rewind

should

than

belt

14)

parts

Fig.

be

the

rubber

gets

of

the

springs

was

14

Torque

over

specified

part

in

spring

concerned.

worn

Parts

60

g/cm.

of

reel-disc,

contact.

holder

out,

range,

in

replace

F.F.

idler

take

and

the

to

the

all

F.F.

new

Note:

To

adjust

screwdriver

The

torque

the

and

is

the

spring

shift

higher

holder,

to

higher

the

raise

position

stronger.

it

up

by

turning.

with

a

No.

7020

MF-33L/ML

|

Head

If

either

of

tion,

it

should

azimuth

Azimuth

Step

1.

2.

3.

of

Connect

REC/PB

Play

back

Tape

VTT658

Adjust

become
When
available,
Make

.

After
with a bond.

If

necessary,

and

trap

Replacement

Recording/PB

be

replaced.

head.

Adjustment

INPUT

socket.

the

10kHz)

screw

Q)

max.

standard

play a music

treble

sound

this

adjustment,

adjust

etc.

jack

standard

so

that

tape

cassette

optimum

playback

head

They

of

V.T.V.M.

tape

for

azimuth

indication

for

azimuth

the

screw

and

Erase

can

(Full

tape.

with

level,

head

be

removed

to

LINE

Track

(angle

of

adjustment

turning

@®

should

recording

and

shows

by

loosening

OUT

or

JVC

adjustment).

V.T.V.M.

is

the

screw

be

locked

bias

current,

Adjustment

low

performance

screws

of

Test

will

not

caused

with

Erase

@ ®

by

wear,

broken

wire

or

excessive

following

procedure.

Yad

Head

After

replacement,

magnetiza-

©

©

=

@

Bae

Fig.

eS

if

15

adjust

Cassette

Item

of

Adjustment

.

Dolby

Noise

Reduction

.

Level

meter

.

Playback

.

Recording

arWN—

.

Recording

Equipment

for

adjustment

VTVM

1.

.

Oscilloscope

.

Oscillator

.

Attenuator

.

Frequency

.

Standard

.

C-60

On

aah

WN

-

100Q

Gain

bias

current

and

(measuring

counter

tape

Normal

sub-standard

Resistor

current

measuring

VTT-664

Deck

Level

AC

in

milivolts)

(1kHz

tape

Circuit

instruments

16mM/mm)

to

be

used

Board

Adjustment

R/P

Head

wo

1002

AC

Fig.

milivoltmeter

16

Frequency

counter

No.

7020

—_

.

DOLBY

1.

Set

SOURCE

2.

Set

DOLBY

3.

Set

the

4.

Apply

proximately)

ol

.

Adjust

level

(L-ch)

17)

6.

Finally

be

-2.5

2.

Adjustment
After

adjustment

was

completed,

that

the

17)

3.

Playback

1.

Set

SOURCE

2.

Set

EQUALIZER

3.

Set

DOLBY

4.

Play
VR301

meter

4.

Adjustment

1.

Connect a resistor
of

R/P

milivoltmeter

(Refer

2.

While

specified

should

Lo

ow

CHROME

NORMAL

3.

Regarding

will

be

set

to

N.R.

deck

1kHz

the

will

be

and

adjust

dBm

of

level

level

the

reference

(L-ch)

will

indicate

of

head

to

Fig.

changing

current

be

made

Place

|

|

bias

obtained

1.

Level

SELECT

N.R.

switch

in

recording
signal

to

“AUX”

front

REC

-25

dBm

VR402

meter

VR401

at

the

Level

adjust

SELECT

(R-ch)

Dolby

Meter

of

the

indicates

switch

N.R

switch

tape

and

OVU.

Recording

10082

in

recording

to

the

16)

the

will

from

to

be

VR307

vR308

VR

(L-ch)

(R-ch)

309

(L,R-ch)

frequency,

when

switch

to

“OFF”.

mode.

of

proper

input

VOLUME

at

respectively.

and

402

T.P.

Dolby

VR303

Cal

switch

to

“NORMAL”,

to

“OFF”.

VTT-664,

VR302

bias

and

to

both

bias

switch,

be

obtained.

“CHROME”.

.

adjusted

adjust

the

front

to

“AUX”.

level

terminal.

so

that

the

terminals

(Refer

so

that

the

(L)

and

(R).

Noise

Reduction

(L) & VR304

(+3VU).

to

(Refer

“TAPE”.

(1kHz),

(R-ch)

so

that

frequency

the

earth

side

state,

and

connect

terminals

of

adjust

The

Bias

Current

550uA

(55mV/1002)

400uA

(40mV/1002)

T301

so

BEAT

CUT

(0.5V_

the

signal

of

VR401

to

level

Level

(R)

to

and

adjust

the

level

terminal

the

resistor.

so

that

adjustment

that

57kHz

Switch

ap-

Fig.

will

so

Fig.

AC

the

is

5.

Adjustment

1.

For

angle
correctly

2.

Set
“NORMAL”,

3.

In

(0.5V
adjust
meter

4.

In

adjust

level

Tape

speed

Standard

tape)

If

not

as

upside

and

case.

(Fig.

17 * )

es

nf

vraoi@)

of

Recording

this

adjustment,

of

the

level

adjusted

the

equalizer

recording

this

meter

speed:

specified,

adjust a semi-VR

state,

approximately)

the

front

will

indicate

state,

repeating

VR305

indicates

3,000Hz

insert

0)

Fig.

signal
it

meter

previously.

switch

apply

to

Recording

OVU.

(L-ch)

and

OVU.

+2%

your

for

oa

VR402

17

current

is

necessary

and

playback

and

1kHz

signal

“AUX”

the

(at

driver

speed

input

volume

recording

VR306

playing a 3,000Hz

in

hole

control

(s)

that

sensitivity

bias

switch

of

proper

terminal,

so

that

and

(R-ch)

on

the

in

the

MF-33L/ML

the

swing

are

to

level

and

the

level

playback,

until

the

test

motor
motor

No.

7020