JVC MIK-100 Manuale utente

MODEL

MIK-100

CASSETTE

RECORDER

No.

0002

April

1978

MK-100

Contents

Page

SPECIFICATION:

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Ser

sor

See

Face,

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ew

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ee

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enn

3

Names

ot

Parts:

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nc.

te

es ee

eo

SS

ty

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ee

SE

ee

hE

Ge

ee

at

es

oe,

©

3

Disassembly

and

Replacement

........0..

0

eet

ee

ke

ee

4

Mechanical

Adjustments

and

Repairs

.........00

00

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ee

ee ee

ee

te

eek

he

te

ee

7

Technical

Information

.

2...

2c

ee

et

tee

ees

9

Adjusting

Recording

Bias

..

2...

0

ee

11

Cleaning

and

Lubrication

..

1...

1.

1

ee

es

11

Before

Services

is.

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a

Be,

ial

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ew

a

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11

Block

Diagram:

jievis:

se

nies

da

ee

GES

a

Pa

Rene

ars,

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Gas

Sw

Bee

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anak

&

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12

schematic

Diagrams:

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13

WIRING)

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wren.

Been

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ee

a

14

Circuit:

Board

Parts:

<<.

3.

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Gece

we

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15

Mechanical

Components

.........0

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es

17

Total

Assembly

=<:

6:63.

3.96

See

ite

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&

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es

eats

bed

Sa

19

Packing

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ea

th.

he

td

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Tact,

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tads

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ater

Merapoieh

erate

MER

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tee

tae,

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fone

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a

22

AGCESSOVICS

55.55:

Sid

hee

Gg

ieee

ans

Teena

lapis

Wan

ot

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ee

GE

we

Pe:

Cay

BAR

ere

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lee

ait

ccaly

22

Specification

DIMENSIONS

:

Type

Tape

speed

Track

system

Recording

system

Erasing

system

Cassette

Fast

forward

time

Rewind

time

Wow

&

flutter

Frequency

response

:

Semiconductors

Speaker

Power

output

No.

0002

81.5mm(W)

x

179mm(H)

x

28mm(D)

3-3/16""(W)

x

7“(H)

x

1-1/8"(D)

Compact

cassette

recorder

4.8cm/s

(1-7/8

ips)

2-track,

monaural

AC

bias,

ALC

DC

erase

Philips

type

compact

cassette

Within

120sec.

(C-60

cassette)

Within

140sec.

(C-60

cassette)

0.25%

wrms

300

—

8,000Hz

1

IC,

18

transistors

5cm

(2)

Samarium

cobalt

speaker

350mW

at

1kHz

WEIGHT

:

Input

jacks

Output

jacks

Power

supply

Battery

life

500g

with

batteries

1.1

Ibs.

Approx.

MIC;

sensitivity

O.3mV

accepts

a

low

impedance

microphone.

DC

IN

(6V)

EAR,

REMOTE

DC

6V

(4”AA"

batteries)

AC

(using

the

AC

adaptor)

Car

battery

(using

the

car

adaptor)

Continuous

recording

time

with

the

built-in

microphone;

approx.

2.5

hours

with

the

super

type

battery

SUM-3

(size

AA)

MK-100

Features

®

Ultra-thin,

ultra-compact

design

—

a

portable

of

portables

designed

to

fit

the

palm

of

your

hand.

A

single

sliding

knob

controls

tape

start,

stop

and

rewind,

permitting

simple,

single-hand

operation.

™

Three

LED

recording

level

indicators,

one

of

which

also

functions

as

a

battery

checker,

assure

you

of

the

best

possible

recordings.

=

A

microphone

sensitivity

select

switch

allows

optimum

recordings

of

both

dictations

and

conferences,

together

with

the

ALC

(Automatic

Level

Control)

circuit.

@

A

newly

developed

ultra-thin

speaker

having

a

diameter

of

50mm

and

incorporating

a

powerful

samarium

cobalt

magnet

achieves

outstanding

sound

quality.

=

Auto-stop

mechanism

stops

the

motor

at

the

end

of

the

tape

during

recording,

playback

or

rewind.

Also

a

warning

tone

is

heard

at

the

tape’s

end,

sparing

of

battery

power.

m

The

stand-by

mechanism

allows

starting

a

recording

at

a

precise

point,

saving

tape

consumption.

@

Three-digit

tape

counter

helps

in

locating

the

beginning

of

a

particular

tape

section.

Names

of

Parts

Fig.

1

Remote

control

jack

(REMOTE)

10

Sensitivity

select

switch

(HIGH/NORM)

2

External

microphone

jack

(MIC)

11

Earphone

jack

(EAR)

3

Built-in

condenser

microphone

12

Security

strap

4

Counter

reset

button

13

External

DC

input

jack

(DC

IN

6V)

5

LED

indicators

14

Volume

control

knob

(VOL)

6

Tape

counter

15

Record

button

(REC)

7

Slide

control

knob

16

EJECT/REVIEW

button

8

Speaker

17.

FF/CUE

button

9

Cassette

compartment

18

Battery

compartment

cae.

ee

No.

0002

MK-100

Disassembly

and

Replacement

The

MK-100

which

features

an

ultra-compact

design

and

high

performance

uses

miniature-sized

parts

which

are

closely

arranged.

Use

special

care

when

servicing

it.

Enclosure

Parts

Name

Procedure

Ref.

No.

Description

Bottom

panel

Remove

four

mounting

screws

and

then

remove

the

bottom

Fig.

3

@)

SPSK2003M

(Black)

panel.

SPSK2003N

(Silver)

5

eerie

Top

panel

Remove

five

screws

and

then

remove

the

top

panel.

Fig.

2,3

@)

|

SPSK2003M(Black)

SPSK2003N

(Silver)

=

Front

panel

1.

Pull

out

the

control

knob.

2.

Remove

two

screws

and

then

remove

the

front

panel.

Fig.

2

@)

SPSK2003M

(Black)

Rear

panel

1.

Remove

two

screws.

Fig.3

@

SPSK2003M

(Black)

2.

Remove

one

screw

and

pull

out

the

security

strap.

Fig.3

®

SPSK2004M

(Black)

3.

Then

remove

the

rear

panel.

=

Inner-lay

and

.

Remove

four

screws

and

then

remove

the

cassette

lid

ass’y.

Fig.

4

©

SPSK2003M

(Black)

cassette

lid

2.

Then

put

out

the

hinge

shaft.

SPSK2003N

(Silver)

Note:

When

disassembling

the

panel,

take

care

not

to

scratch

it.

Electric

parts

Parts

Name

Procedure

Description

Circuit

board

1.

Remove

the

bottom

panel,

front

panel,

control

knob,

top

panel

See

‘Enclosure’

sec-

and

rear

panel.

tion.

2.

Then

remove

three

screws.

SPSK2004N

Note:

When

removing

the

circuit

board,

if

you

set

the

circuit

board

up

by

a

screw-driver

keeping

the

leaf

switch

away

from

the

F.F.

button,

removing

is

very

easy.

.

Remove

seven

wires

and

one

diode

soldered

to

circuit

board.

Then

remove

circuit

board

ass’y.

When

installing

the

circuit

board,

please

install

it

after

the

slide

switch

for

PLAY/RECORD

is

switched

over

to

the

play

position.

Sub-board

Remove

one

screw

and

raise

the

sub-board.

F004

10-235M

No.

0002

MK-100

Control

Knob

Security

strap

Fig.

2

Fig.

3

©) @)

©®

Sub

board

Hinge

shaft

Amp.

circuit

board

7

Fig.

4

YY

@

Fig.

5

E.

governor

board

—

BLK

—_—___———_

oRN

#—-——-

BLUE

(Governor)

‘

RED

|

*———_

YLW

(two

wires)

,

=

BLUE

(Speaker)

Diode

R/P

switch

Fig.

6

Fig.

7

—

No,

0002

MK-100

|

Mechanical

parts

Parts

Name

Procedure

Ref.

No.

|

Remarks

Mecha.

ass’y

Remove

two

screws.

Fig.4

@

SPSK2004N

Then

the

Meca.

ass’y

can

be

separated

from

the

battery

case

ass’y.

1.

Remove

two

screws

and

then

remove

the

motor

and

motor

Fig.

8

SPSK2045M

Motor

bracket.

2.

Remove

two

screws.

Fig.9

()

|

SPSK1703M

Flywheel

ass’y

2.

Then

remove

the

flywheel

holder.

1,

Remove

one

screw

and

then

remove

two

screws.

Fig.

8

4243]

SPSK1703M

SPSK2003M

For

capstan:

1.

Remove

one

screw

and

then

remove

two

screws.

Then

remove

the

flywheel

holder.

.

Remove

an

E

ring

and

then

remove

the

take-up

arm

ass’y.

F

Belts

iz

.8@

REE2000

Pinch

roller

arm

ass’y

together

pinch

roller

arm

spring.

1.

Remove

an

E

ring

and

then

remove

the

pinch

roller

arm

ass’y,

Fig.

1045)

REE1500

Take-up

disk

Remove

a

disk

screw.

F28457-01

Remove

an

E

ring.

1.

Remove

an

E

ring

and

then

remove

the

take-up

arm

ass’y.

Fig

2.

Then

remove

an

E

ring.

FF

idler

ass’y

Take-up

arm

ass‘y

Fig.

8

(8

Pinch

roller

arm

spring

@

Pinch

roller

arm

assy

No,

0002

bgt

REE1500

REE2000

REE1500

Fig.

9

Fig.

10

MK-100

Mechanical

Adjustments

and

Repairs

1.

Head

replacement

and

adjustment

Clean

and

demagnetize

the

head

and

guide

each

time

the

machine

is

serviced,

If

normal

fidelity

is

not

obtainable

head

replacement

is

indicated.

Head

replacement

1)

R/P

head

Remove

two

wires

soldered

to

head.

*

Remove

a

screw

and

head

nut.

Then

replace

head.

Solder

as

shown

in

Fig.

11.

2)

Erase

head

Remove

two

wires

soldered

to

head.

Remove

a

screw

and

replace

head.

Solder

as

shown

in

Fig.

11.

Location

of

heads

The

R/P

and

Erase

heads

should

be

positioned

as

shown

in

Fig.

13.

Azimuth

adjustment

of

the

head

should

be

done

according

to

the

following

instructions.

Screw

7

'

:

nad

Screw

R/P

Head

E.

Head

nut

Fig.

11

Fig.

12

@

Screw

E.

Head

R/P

Head

Fig.

13

Azimuth

adjustment

1)

Plug

a

cord

into

the

earphone

jack

(EAR)

and

connect

a

6

ohm

resistor

(corresponding

to

a

loudspeaker)

in

parallel

with

the

cord.

2)

Connect

an

oscilloscope

or

electronic

voltmeter

across

the

terminals

of

the

cord.

3)

While

playing

back

a

test

6.3kHz

tape

(VTT-651)

for

azimuth

adjustment,

adjust

head

nut

(Fig.

13)

so

that

the

maximum

output

can

be

obtained.

4)

If

no

test

tape

is

available,

play

back

a

music

cassette

and

adjust

for

maximum

output

and

clarity

in

the

high

frequency

range.

5)

Be

sure

to

lock

the

head

nut

()

with

paint

after

adjustment.

2.

Pinch

roller

arm

adjustment

(Pressure

of

pinch

roller)

Pressing

the

indicated

by

the

arrow

to

the

play

back

mode.

Fig.

12

Check

to

see

that

the

gap

between

the

stopper

of

head

base

and

the

pinch

roller

arm

should

be

within

0.3

to

0.7mm.

If

it is

beyond

the

limits,

adjust

it

by

bending

the

part

@)

of

pinch

roller

arm

as

shown

in

Fig.

14.

Head

base

(stopper)

@)

Pinch

roller

arm

Fig.

14

3.

Timing

of

review

action

Move

slide

control

to

play

(start)

position.

Press

Review

button

as

far

as

pin@hits

the

plastic

cam).

Check

clearance

of

©)

for

idler

pressure,

and

bend

©

so

that

lid

lock

plate

is

kept

in

place.

Press

|

No.

0002

MK-100

4,

Motor

speed

adjustment

7.

Fast

forwarding

torque

Fig.

18

1)

Plug

a

cord

into

the

earphone

jack

(EAR)

and

connect

a

Normal

torque

:

60

gr-cm

or

more

6

ohm

resistor

in

parallel

with

the

cord.

If

this

is

not

obtainable,

2)

Connect

a

frequency

counter

across

the

terminal

of

the

1)

Clean

drive

belt,

idler

and

clutch

disk

tire.

cord,

2)

Replace

idler

ass’y.@

3)

While

playing

back

a

test

3kHz

tape

(VTT-656)

for

3)

Replace

clutch

disk

ass’y.

@)

motor

speed

adjustment,

adjust

VR

on

the

E

governor

4)

Replace

drive

belt.

@)

board

(see

Fig.

16.)

so

that

the

frequency

counter

indicates

within

2,970

to

3,060Hz.

8.

Rewinding

torque

Fig.

18

Normal

torque

:

40

gr-cm

or

more

If

this

is

not

obtainable,

1)

Clean

belt,

idler

and

pulley.

2)

Replace

rewind

belt.

6)

3)

Replace

idler.

©

4)

Replace

pulley.

(7)

Slow

Fast

Fig.

16

5.

Thrust

of

Flywheel

The

clearance

between

the

top

of

flywheel

shaft

and

the

flywheel

holder

should

be

within

0.1

to

0.3mm.

If

the

clearance

is

beyond

the

limits,

adjust

the

screw

for

normal

value.

Note:

After

adjustment,

fix

the

screw

with

lock

adhesive.

Thrust

screw

0.1~0.3mm

Fig.

18

Fig.

17

6.

Playback

torque

Fig.

18

Normal

torque

:

30~40

gr-cm

If

this

is

not

obtainable,

1)

Clean

drive

belt,

take-up

wheel,

and

clutch

disk

tire.

2)

Replace

clutch

disk

ass’y.

(1)

3)

Replace

take-up

wheel.

@)

4)

Replace

drive

belt.

3)

No,

0002

|

MK-100

Technical

Information

1.

Stand-by

mechanism

When

the

unit

is

not

loaded

with

a

cassette,

the

slide

contro!

knob

(3)

is

immovable

since

the

(1)

is

engaged

within

the

cam

(2).

Loading

a

cassette

properly

depresses

the

thrust

(4)

which

in

turn

releases

(5)

permitting

the

head

base

(6)

to

move

forward

so

the

head

can

make

contact

with

the

tape.

However,

the

tape

is

not

transportable

in

this

mode

since

the

pinch

roller

and

the

capstan

(9)

are

not

making

actual

contact

because

the

S.

plate

(7)

is

holding

back

the

pinch

roller

arm

(8).

This

is

to

say

that

the

stand-by

mode

is

now

in

effect.

Pushing

the

slide

control

knob

up

towards

the

PLAY

position,

will

commence

running

of

the

tape.

When

the

cassette

is

being

ejected,

the

pressing

of

the

eject

button

pushes

backward

the

head

base

and

(4)

is

pressed

inwards

by

the

spring

(10)

and

the

head

base

automatically

returns

to

its

original

position.

Continuing

to

press

the

eject

button

in

this

manner

will

raise

the

eject

lever

(11)

and

permit

the

cassette

to

be

withdrawn.

Press

to

lock

the

REC

button

and

push

the

slide

control

knob

up

towards

the

PLAY/REC

position

to

start

the

tape.

Then

the

tape

will

start

running

for

recording.

Pushing

the

slide

control

knob

down

towards

the

STOP

position

only

stops

the

tape

transport

leaving

the

record

button

in

its

locked

position.

This

is

the

same

as

a

conventional

pause

mode.

In

order

to

release

the

REC

button,

push

the

slide

control

knob

down

towards

the

REW/REC

OFF

position

or

press

the

eject

button.

Pressing

the

REC

button

during

playback,

can

change

the

playback

mode

directly

into

the

recording

mode.

Fig.

19

2.

Circuit

for

auto-stop

and

tape-end

warning

This

recorder

is

equipped

with

a

mechanism

in

which

the

motor

automatically

stops

and

a

warning

signal

becomes

audible

from

the

speaker

soon

after

the

tape

reaches

to

its

end

in

any

mode.

The

tape-end

is

automatically

detected

by

the

take-up

disc

signalling

the

tape’s

completion.

A

reflection

plate

alternately

colored

silver

and

black

as

shown

in

illustration

is

placed

on

the

under

surface

of

the

take-up

disc.

After

the

power

is

turned

on,

the

LED

(D15)

lights

and

illuminates

this

reflecting

plate.

The

photo

transistor

X11

is

placed

to

the

side

of

the

LED

and

the

impedance

across

its

collector

and

emitter

varies

in

proportion

to

the

amount

of

reflection

from

the

reflecting

plate,

thus

varying

its

collector

voltage.

When

the

reel

disc

stops,

the

amount

of

reflection

ceases

to

vary

and

likewise

the

collector

voltage

at

X11

will

become

stable.

X12

is

a

switching

transistor

and

is

biased

to

be

turned

on

by

the

charging

current

which

flows

to

C36

through

R51

when

the

collector

voltage

at

X11

increases

in

the

positive

direction

from

0.

Therefore,

while

the

take-up

disc

is

rotating,

X12

con-

tinues

to

be

turned

on

and

off

alternately.

When

the

take-up

disc

ceases

to

rotate,

X12

comes

to

be

turned

off.

On

the

other

hand,

after

the

power

is

turned

on,

X14

is

biased

and

turned

on

through

R56

and

the

motor

starts

rotating

since

the

negative

pole

in

the

motor

governor

is

earthed.

At

the

same

time,

C37

is

charged

through

R54

and

its

voltage

across

terminals

tends

to

increase

gradually.

—_9_—

No.

0002

MK-100

|

However,

as

mentioned

above,

since

X12

continues

to

be

turned

on

and

off

alternately

during

rotation

of

the

take-up

disc,

C37

is

immediately

discharged

through

R53

and

X12.

When

the

tape

reaches

to

its

end

and

the

take-up

disc

stops

rotating,

X12

is

already

turned

off

and

the

voltage

between

C37

terminals

gradually

increases.

Then,

when

the

voltage

sufficiently

increases

to

about

2.7V,

X13

is

biased

and

turned

on

through

the

zener

diode

D14.

As

a

result,

X13

earthes

X14’s

a

base

and

X14

is

no

longer

biased

but

turned

off,

thereby

halt-

ing

the

motor.

At

this

time,

the

collector

voltage

at

X14

increases

to

correspond

to

the

power

supply

voltage,

switching

on

the

oscillator

circuit

and

producing

the

warning

tone

from

the

speaker.

Motor

Warning

Tone

OSC.

Circuit

Fig.

20

3.

Circuit

for

3-LED’s

level

indicators

and

battery

checker

This

recorder

is

equipped

with

3-LED’s

indicators

that

function

as

level

indicators

during

recording

and

as

a

battery

checker

during

playback.

The

recording

signal

from

the

main

amplifier,

during

recording,

is

converted

into

direct

current

through

R42

and

the

quadrupled

voltage

rectifier

circuit

composed

of

C32

—

C35

and

D10

—

D13.

Then

the

direct

current,

proportional

to

this

signal,

flows

through

the

attenuator

composed

of

R45

—

R49

and

applied

to

transistors

X8

—

X10,

resulting

in

the

lighting

of

the

LEDs

according

to

their

specific

lighting

levels.

In

the

cases

of

modes

other

than

stop

or

recording,

a

voltage

in

proportion

to

the

power

supply

voltage

produced

through

R41 and

R37

is

applied

to

X9

through

D8.

When

the

power

supply

voltage

is

more

than

4.2V

(+0.2V),

X9

is

turned

on

and

the

LED

of

N

(D17)

lights.

°

Recording

Signai

|

0

from

Main

Amp.

—

R4l

Dil2

+B

No.

0002

—~10—

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