JVC TD-X102 Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

1

Inhaltsverzeichnis

Andere JVC Kassettenspieler Handbücher

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MODEL

TD-X102

A/B/C/E/G/U/V

This

model

TD-X102

is

a

version

of

the

model

KD-X1.

When

servicing

the

model

TD-X102,

refer

to

the

Service

Manual

for

the

mode!

KD-X1

(No.

4243)

Comparison

Table

A\

parts

are

safety

assurance

parts.

VSEA

When

replacing

those

parts,

make

sure

to

use

the

specified

one.

,

please.

]

+

.

Parts

No.

“|

A\|

Ref.

No.

+

Parts

Name

Remarks

O'ty

L

TD-X102

KD-X14

|

Enclosure

Assembly

Parts

List

[

10

|

VJC2171-009

VJC2171-001

Rear

Panel

A/B/C/E

version

~

1

i

ee

-010

vt

-002

a

U

version

1

ue

a

-011

a

-003

G/V

version

1

11

SDST3006M

SDST3006N

Screw

for

Rear

Pane!

2

12

SDSP3008M

SDSP3006N

=

U

version,

for

V.

Selector

2

VAN

14

QMP7380-200

QMP7600-200

Power

Cord

U

version

1

“AN

16

VTP52G2-021B VTP54N2-021B

Power

Transformer

U

version

1

22

SDSF3008M

SDSF3008N

Screw

for Pin

Jack

1

24

VJC1418-002

VJC1418-007

Front

Plate

1

|

26

VJC1417-013

VJC1417-011

Front

Panel

except

J

version

Zz

29

VXP3131-002

VXP3131-001

Power

Knob

1

33

E72968-001 E70913-001

Mark

1

45

VJD4895-008

VJD4895-001

Plate

1

51

VXP3129-013

VXP3129-008

Push

Button

for

Play

1

52

a

-014

ie

-009

ss

|

for

REW

1]

[

53

of

-015

-

-010

i

for

FF

1

54

i

-016

me

-011

"

for

Stop/Eject

1

55

i

-017

fd

-012

7

for

Pause

1

61

VJC2175-005

VJC2175-002

Top

Cover

1

64

VYN2200-003PA

|

VYN2176-003PA

|

Name

Plate

A

version

L714

ie ie

-002PA

"

-002PA

ue

B

version

1

as

4

-004PV

e

-004PV

ne

C

version

1

He of

-O05PA

ae

-OO5PA

uf

E

version

1

a

-

-007PA

=

-007PA

u

U

version

1

ss fe

-008PA

us

-O08PA

me

G

version

1

“““009PA

|”

—-OO9PA

”

V

version

1

|

33,34,

ag|

ZCTDX1020-FBK|

ZCTDXIG-FBK

|

Front

Panel

Ass’y

1

L_

43,45-47

|

ZCTDX1020-CH

|

ZCTDX10-CH

Cassette

Holder

Ass’y

re

a

No.

4277

March

1987

§wOe#

-X102A/B/C/E/G/U/V

A

Parts

are

safety

assurance

parts.

When

replacing

those

parts,

make

sure

to

use

the

specified

one.

VNN2200-211

VNNO157-301

Instruction

Book

B/E/G

version

VNN2201-621

ae

-901

a

A/C/U

version

VNN2200-901

V

version

VPC2200-002

VPC2141-002

B

version

-

-003

te

-003

A

version

-004

tf

-004

C

version

es

-005

sd

-005

E

version

as

-007

om

-007

U

version

G

version

V

version

VICTOR

COMPANY

OF

JAPAN,

LIMITED.

AUDIO

PRODUCTS

DIVISION

MAEBASHI

PLANT

10-1,

1-chome,

Ohwatari-cho,

Maebashi-city

371,

Japan

(No.

4277)

Printed

in

Japan

—6203-—-S—

KD-X1

A/B/C/E/G/J/

JVC

SERVICE

MANUAL

moo.

KD-

qe

Contents

Safety

Precautions

..

1...

0.0.0.0.

eee

eee

2

Wiring

Connections

..........

00.00.2000

eee

12

Spacifications..

0.0...

3

Enclosure

Assembly

Parts

List

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

13

Location

of

Main

Parts

.................00005.

3

Exploded

View

of

Enclosure

Assembly...........

15

Removal

of

Main

Parts............

000000000

ae

4

Exploded

View

of

Mechanism

Assembly

.........

16

Main

Adjustment

.°........0..0.0.00.0

20000000005

6

Mechanism

Assembly

Parts

List

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

17

Standard

Schematic

Diagram................05.

9

ACCe@SSOFIES)

yo

hei

fe

te,

ae

ee

ee

oa

Be

Blea

19

P.

C.

Board

Parts

and

Parts

List

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

10

Packing

and

packing

Parts

List

No.

4243

December

1984

KD-X1

A/B/C/E/G/J/U

|

Safety

Precaution

1.

The

design

of

this

product

contains

special

hardware.

Many

circuits

and

components

specially

for

safety

purposes.

For

continued

protection,

no

changes

should

be

made

to

the

original

design

unless

authorized

in

writing

by

the

manufacturer.

Replacement

parts

must

be

identical

to

those

used

in

the

original

circuits.

Service

should

be

per-

formed

by

qualified

personnel

only.

2.

Alterations

of

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

design

alterations

or

additions

will

void

the

manufacturer’s

warranty

and

will

further

relieve

the

manufacturer

of

responsibility

for

personal

injury

or

property

damage

resulting

therefrom.

3.

Many

electrical

and

mechanical

parts

in

the

product

have

special

safety-related

characteristics.

These

charac-

teristics

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

by

then

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage,

wattage,

etc.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

the

parts

list

of

Service

manual.

Electrical

components

having

such

features

are

identified

by

(

Z\)

on

the

schematics

and

parts

list

in

Service

manual.

The

use

of

a

substitutue

replacement

which

does

not

have

the

same

safety

characterisitics

as

the

recommended

replacement

part

shown

in

the

parts

list

in

Service

manual

may

create

shock,

fire,

or

other

hazards.

4.

The

leads

in

the

products

are

routed

and

dressed

with

ties,

clamps,

tubings

barriers

and/or

the

like

to

be

separated

from

live

parts,

high

temperature

part,

mov-

ing

parts

and/or

sharp edges

for

the

prevention

of

elec-

tric

shock

and

fire

hazard.

When

service

is

required,

the

original

lead

routing

and

dress

should

be

observed,

and

they

should

be

confirmed

to

be

returned

to

normal,

after

re-assembling.

2

(No.

4243)

5,

Leakage

current

check

(Safety

for

electrical

shock

hazard)

After

re-assembling

the

product,

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

Pro-

ducts

(antenna

terminals,

knobs,

metal

cabinet,

screw

heads,

earphone

jack,

control

shafts,

etc.)

to

be

sure

the

product

is

safe

to

operate

without

danger

of

electrical

shock.

Do

not

use

a

line

isolation

transformer

during

this

check.

e

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Us-

ing

a

“Leakage

Current

Tester’,

measure

the

leakage

current

from

each

exposed

metal

part

of

the

cabinet,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

to

a

known

good

earth

ground

(water

pipe,

etc,).

Any

leakage

current

must

not

ex-

ceed

0.5

mA

AC

(r.m.s.).

e

Alternate

check

method.

Plug

the

AC

line

cord

directly

into

the

AC

outlet.

Use

an

AC

voltmeter

having

1,000

ohms

per

volt

or

mroe

sesitivity

in

the

following

manner.

Connect

a

1500

Q

10

W

resistor

paralleled

by

a

0.15

wF

AC-type

capaci-

tor

between

an

exposed

metal

part

and

a

known

good

earth

ground

(water

pipe,

etc.).

Measure

the

AC

voltage

across

the

resistor

with

the

AC

voltmeter.

Move

the

resistor

connection

to

each

exposed

metal

part,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis,

and

measure

the

AC

volt-

age

across

the

resistor.

Now,

reverse

the

plug

in

the

AC

outlet

and

repeat

each

measurement.

Any

voltage

measured

musy

not

exceed

0.75

V

AC

(r.m.s.).

This

corresponds

to

0.5

mA

AC

(r.m.s.).

AC

VOLTMETER

(HAVING

1000

2/V

OR

MORE

SENSITIVITY)

0.15

pF

AC-

TYPE

1500.

10W

PLACE

THIS

PROBE

ON

EACH

EXPOSED

METAL

PART

GOOD

EARTH

GROUND

Specifications

Type

Track

system

Tape

speed

Frequency

response:

Note:

“1...

bi

ee

3

*

S/N

ratio

Wow

and

flutter

Crosstalk

:

Stereo

cassette

deck

:

4-track,

2-channel

:

1-7/8

inch/sec

(4.8

cm/sec)

(0

dB

recording)

Metal

tape

*1;

40—11,000

Hz

(+

3

dB)

Chrome

tape

*2;

40—8,000

Hz

(+

3

dB)

Normal

tape

*3;

40—8,000

Hz

(+

3

dB)

(—20

dB

recording)

Metal

tape

*1;

30

—

16,000

Hz

40

—

15,000

Hz

(+3dB)

Chrome

tape,

*2:

30

—

16,000

Hz

40

—

15,000

Hz

(+3dB)

Normal

tape;

*3;

30

—15,000

Hz

40

—

14,000

Hz

(+3dB)

JVC

ME

or

Equivalent

TDK

SA

or

Equivalent

MAXELL

UD

or

Equivalent

:

58dB

(S=1kHz,

K3

=

3%,

N

=

A-Weight,

Metal

tape)

The

S/N

is

improved

by

5

dB

at

1

kHz

and

by

10

dB

above

5

kHz

with

ANRS/

DOLBY

B

NR

on.

:

0.08

%

(WRMS),

0.20

%

(DIN

45

500)

:

60

dB

(1

kHz)

Location

of

Main

Parts

Rec/PB

Switch

Main

P.C.

Board

Ass’y

Power

Switch

Fig.

1

KD-X1

A/B/C/E/G/J/U

Harmonic

distortion:

K3;

0.5%,

THD;

1.0

%

(metal

tape,

1

kHz

O

dB)

Heads

:

METAPERM

head

for

recording/play-

back,

2-gap

ferrite

head

for

erasure

Motor

:

Electronic

governed

DC

motor

Fast

forward

/

Approx.

100

sec.

with

C-60

cassette

Rewind

time

Input

terminals

Mic

jack

x

2

:

Max.

sensitivity;

0.4mV

(—68

dBV)

Matching

impedance;

600

2

—

10

kQ

Input

jack

x

2.

:

Min.

input

level;

50

mV

Input

impedance;

100

k22

Output

terminals

Output

jack

x

2

:

Output

level;

300

mV

Output

impedance;

5

kQ

Power

requirement

:

AC

240

V,

50/60

Hz

(KD-V120

A)

AC

120

V,

60

Hz

(KD-V120

C/J)

AC

240/220/110

V,

50/60

Hz

(KD-V120

U)

Power

consumption:

With

power

on;

10

W

With

power

switch

off;

0.8

W

Dimensions

:

17-1/8"

(435

mm)

W

4-9/16”

(115mm)H

9-3/8”

(237

mm)D

Weight

:

7.7

lbs

(3.5

kg)

Accessories

:

Pin

plug

cord...2

Design

and

specifications

are

subject

to

change

without

notic

Power

Transformer

Fuse

Power

Cord

Mechanism

Ass‘y

Rec

Safety

Lever

(No.

4243)

3

KD-X1

A/B/C/E/G/J/U

|

Removal

of

Main

Parts

Enclosure

Section

Removal

of

Top

Cover

1.

Remove

six

screws

retaining

the

both

sides

of

the

top

cover.

2.

Remove

the

screw

retaining

the

back

side

of

the

top

cover.

Removal

of

Bottom

Cover

1.

Remove

three

screws

retaining

the

front

side

of

the

bottom

cover.

2.

Remove

three

screws

retaining

the

rear

side

of

the

bottom

cover.

Removal

of

Rear

Panel

1.

Remove

three

screws

retaining

the

jack

and

chassis

to

the

rear

panel.

Removal

of

Front

Panel

1.

Remove

the

screw

@)

retaining

the

left

side

of

the

front

panel.

2.

Remove

the

screw

(2)

retaining

the

bottom

side

of

the

front

panel.

3.

Remove

the

screw

(G3)

retaining

the

earth

wire

with

the

mechanism

ass’y.

4.

Pull

out

two

knobs.

Removal

of

Mechanism

Ass’y

1.

Remove

the

counter

belt.

2.

Remove

three

screws

(4)

retaining

the

mechanism

ass‘y.

3.

Open

the

cassette

door

and

remove

the

mechanism

ass’y.

Removal

of

Tape

Counter

1.

Remove

two

screws

6).

Removal

of

Damper

1.

Remove

the

screw

(6).

Removal

of

Power

Switch

(See

Fig.5)

1.

Push

the

switch

knob

outward

to

remove

it.

2.

Push

the

switch

ass’y

in

the

direction

of

the

arrow

to

remove

it.

Note:

When

reinstalling

the

switch

ass’y:

1)

Set

the

switch

to

its

ON

position.

2)

Fix

it

as

shown

in

the

right

figure.

3)

Set

the

knob

to

the

switch.

LED

Indicator

Remove

five

pawis

@)

retaining

the

indicator

board

ass‘y.

4

(No.

4243)

Amp.

Board

Ass'y

Removal

figure

reinstement

figure

Fig.

5

Mechanism

Section

Mechanical

parts

©

Rec./PB

head

1)

Remove

2

screws

3)

for

the

button

assembly.

2)

Remove

a

screw

82)

3)

Loosen

a

screw

@3)

for

adjustment.

@

Erase

head

1)

Remove

a

screw

:

2)

Remove

a

screw

for

adjustment.

@

Pinch

roller

arm

assembly

1)

Remove

a

stopper

holding

its

assembly,

and

pull

it

off

from

the

shaft.

@

Supply

reel

disc

assembly

1)

Pull

out

the

reel

disc

stopper

67)

and

remove

its

disc

from

the

shaft.

@

Take-up

reel

disc

1)

Pull

out

the

reel

disc

stopper

and

remove

it

from

the

shaft.

Note:

Remove

the

reel

disc

stoppers

with

a

piece

of

sheet

metal

inserted

between

the

reel

disc

and

stopper,

when

assembling

the

reel

disc,

the

stopper

needs

a

new

parts

(the

stopper

cannot

be

used

again).

@

Motor

1)

Remove

3

screws

;

and

fastening

the

FM

bracket.

(When

removing

the

FM

bracket

42)

F

remove

with

the

main

belt

and

the

RF

belt

)

2)

Remove

3

screws

45)

fastening

the

motor.

3)

Pull

out

the

motor

pulley

from

the

motor

shaft.

Note:

Be

careful

not

to

stain

the

main

belt

and

RF

belt.

(When

assembling

the

motor

pulley,

adjust

the

pulley

position

as

next

figure.)

10.5mm

MOTOR

Fig.

6

KD-X1

A/B/C/E/G/J/U

Fig.

8

@

Flywheel

assembly

Pull

out

the

flywheel

from

the

capstan

metal.

How

to

assemble

the

FM

bracket

and

belts

1)

Assemble

full

auto

belt

and

RF

belt

as

next

figure.

2)

Fasten

3

screws,

to

assemble

the

FM

bracket.

Full

autobelt

Main

belt

FM

bracket

RF

beit

Flywheel

Motor

Fig.

9

(No.

4243)

5

KD-X1

A/B/C/E/G/J/U

|

Main

Adjustment

[1]

Equipment

and

measuring

instruments

used

for

5)

Reference

tapes

for

playback

(JVC

Test

Tape)

adjustment

VTT703

LL

(for

head

azimuth

adj.)

VTT712

(for

motor

speed,

wow

flutter

adj.)

1.

Electrical

adjustment

V11739

(for

playback

frequency

response}

1)

Electronic

voltmeter

6)

Resistor

600

22

(for

attenuator

matching)

2)

Audio

frequency

oscillator

(range:

30—20

kHz

and

output

0

dB

with

impedance

600

22)

2.

Mechanical

adjustment

3)

Attenuator

1)

Torque

testing

cassette

gauge,

CTG-N.

4)

Standard

tapes

for

REC/PB

Maxell

UD

—

Norom

(SF)

tape.

.

.

TDK

SA

—Chrome

(SA)

tape...

.

—

or

equivalent

JVC

ME

—

Metal

tape.........

[11]

Mechanical

adjustment

(Adjust

the

mechanism

or

confirm

that

it

is

in

normal

operating

condition

prior

to

the

adjustment

of

the

electrical

circuit.)

Item

Adjustment

Adjusting

|

Standard

Remarks

|

point

value

Adjusting

1.

Connect

an

electronic

voltmeter

to

Screw

(A)

Maximum}

If

the

head

is

worn,

disconnected

or

record/play

back

the

LINE

OUT

terminals.

exceedingly

magnetized

so

as

not

to

.

Play

back

the

VTT7O3L

test

tape.

.

Adjust

the

head

angle

with

the

screw

@)

until

the

reading

of

the

electronic

voltmeter

becomes

maxi-

mum

for

both

channels.

4.

After

adjusting,

set

the

screw

with

screw

bond.

head

position

provide

the

necessary

characteristics,

replace

it

with

a

new

one.

After

replacement,

the

head

position

adjustment

as

well

as

the

playback

level

adjustment,

the

bias

current

ad-

justment

and

the

recording

level

ad-

justment

are

all

necessary.

If

the

output

difference

between

the

left

and

right

channels

exceeds

3

—

4

dB,

the

head

is

defective.

Replace

it

with

a

new

one.

WR

Adjustment

erase

head

height

.

Turn

the

adjusting

screw

for

align-

ing

the

erase

head

until

it

stops.

Then,

turn

the

screw

in

the

reverse

direction

by

180°

{a

%

revolution).

2.

Employ

a

special

cassette

(C-120)

from

which

parts

of

the

casing,

where

the

erase

head,

record/play-

es

@)

back head

and

capstan

engage,

has

|

been

cut

away.

Perform

tape

trans-

©

0)

port

with

the

cassette

tape.

Adjust

the

screw

until

the

tape

runs

in

|

the

center

of

the

erase

head

tape

Be

sure

to

perform

this

adjustment

after

replacing

the

erase

head.

Correct

Incorrect

4

Tape

guide

-

Tape

guide

~Tape

ae

Tape

guide

[=

Semi-

3000

Hz

|

If

the

speed

meter

functions

as

a

wow

fixed

and

flutter

meter,

also,

connect

the

resistor

deck

to

the

INPUT

terminals

of

the

in

the

meter.

motor

guide.

-

Adjusting

motor

|

Connect

a

speed

meter

(an

electronic

speed

counter)

to

the

LINE

OUT

terminals.

Play

back

the

VTT712

test

tape.

Adjust

the

semi-fixed

resistor

in

the

motor

until

the

reading

of

the

speed

meter

is

3000

Hz.

-

4

+

+

+~

SS

Checking

wow

Connect

a

wow

and

flutter

meter

to

0.08%

If

the

reading

becomes

moving

value

and

flutter

LINE

OUT

terminals.

(WRMS)

|

even

if

conforming

to

the

standard,

a

Play

back

the

VTT712

test

tape.

0.2%

re-claim

may

be

raised.

Repaits

are

‘lps

to

see

if

the

reading

of

the

(DIN45500)

|

necessary.

meter

is

within

0.08%

(WRMS).

|

T

Checking

play-

Employ

a

torque

testing

cassette

tape

40-70

If

the

standard

torque

is

not

obtained,

back

torque

for

the

checking,

or

remove

the

cas-

gr-cm

replace

the

take-up

disc

assembly.

|

sete

cover

and

use

a

torque

gauge.

ee

6

(No.

4243)

|

KD-X1

A/B/C/E/J/G/U

Adjustment

Adjusting

|

Standard

Remarks

|

point

value

Checking

fast

Measure

the

torque

in

the

fast

forward

More

than]

If

the

standard

torque

is

not

obtained,

forward

torque

mode

in

the

same

manner

as

in

the

70

gr-cm

|

perform

the

following.

above.

1.

Clean

the

capstan

belt,

the

idler

cir-

cumference,

the

motor

pulley,

the

take-up

reel

disc

circumference,

the

flywheel

circumference,

etc.

2.

Repiace

the

belt

and

idler.

a.

SS

Checking

rewind

|

Measure

the

torque

in

the

rewind

mode

More

than};

If

the

standard

torque

is

not

obtained,

torque

in

the

same

manner

as

in

the

above.

70gr-cm}

clean

the

capstan

belt,

idler,

motor

pulley,

flywheel

circumference,

rewind-

ing

idler

circumference,

left

reel

disc

circumference,

etc.

[Ml]

Electrical

adjustments

location

Main

Amp.

P.W.

Board

(parts

assembly

side

view)

(Turning

in

the

direction

of

the

arrow

increases

the

level.)

MIC

JACK

L901

BIAS

Siri

SS)

FREQUENCY

ch

REC

CANN

SO

R142

ears

hd

=

57

eee)

=

8104

(15)

5)

@1.5)

3)

Lch

BIAS

ADJ

6ezu!

272)

(72

Ur.

Rch

BIAS

ADJ

oo

i

ne

Se

On

ome)

[omeeoemneee

|

ss

Po

a

AD)

B20!

Biol

ich

PB. EQ.

ADJ

REC/PB

SWITCH

Fig.

10

[IV]

Electrical

circuit

adjustment

procedure

In

the

steps

marked

by

an

asterisk

(*),

adjustment

should

Adjustment

should

be

performed

in

the

order

of

steps

1,

2,

be

performed,

however,

only

checking

is

sufficient

with

Riera

Perform

this

adjustment

with

the

NR

SYSTEM

steps

other

than

those.

switch

set

to

OFF.

Standard

value

Reference

|

NR

SYSTEM:

OFF

Adjusting

point

B100,

Adjustment

Play

back

Playback

test

tape

VTT739

(1

kHz,

frequency

10

kHz)

for

following

adjustment.

101

frequency:|

TAPE

SELECT:

NORM

response

1.

Connect/Disconnect

B100

or

B101|

8g200,

1

kHz

and

B200

or

201

so

that

10

kHz

201

O0+2dB

signal

and

1

kHz

signal

gains

become

at

10kHz

flat

response.

(No.

4243)

7

KD-X1

A/B/C/E/G/E/J/

|

Checking

record/

play

back

distortion

play

back

the

recorded

part,

and

check

so

that Line

out

ter-

minal

level

become

O

+

2.5

dB.

2.

If

the

standard

value

cannot

be

obtained,

adjust

the

recording

level

using

R139,

140,

141 and

142

in

combination

(for

L-ch),

and

R239,

240,

241

and

242

(R-ch),

respectively.

.

Record

a

1kHz,

—8dB

signal

to

LINE

IN

terminals

and

perform

recording

with

the

multi-peak

becomes

to

0.

2.

Play

back

the

recorded

part.

Check

the

output

with

a

distortion

meter

to

see

if

the

value

conforms

to

the

standard

value.

NORM

Item

Adjustment

mes

Ray

Remarks

Checking

Record

1

kHz,

50

Hz

and

12.5

kHz

|

For

Reference

This

checking

should

be

performed

record/

signals

at

an

input

level

of

0

dB

to

|

NORM

frequency;

for

normal

tapes

and

for

both

right

playback

—20

dB.

tape;

1

kHz

and

left

channels.

frequency

Play

back

the

tape.

Lch

B102

1.

Bias

current

adjustment

for

a

response

Check

to

see

that

the

50

Hz

and

B103

cassette

deck

should

generally

be

12.5

kHz

signal

output

deviations

fall

B104

0+3dBat

performed

referring

to

the

record/

within

the

standard

range,

using

the

|

Reh

ee

50

Hz

playback

frequency

response.

1

kHz

signal

output

as

a

reference.

B204

|

0+3dBat

This

is

Sai

the

ein!

i

eas

:

12.5

kHz

sponse

of

a

cassette

deck

depends

i

are

eara

7.

more

greatly

upon

the

bias

cur

=

rent

than

does

that

of

an

open

a

ix

reel

deck.

3

;

2.

If

the

bias

current

is

not

proper-

5

Sven

cea

ete

ly

adjusted,

the

record

and

play-

z

Decrease

in

high

frequencies

back

characteristics

become

as

a

(with

a

larger

bias

current)

shown

left.

50

Hz

1

kHz

12.5

kHz

Frequency

(Hz)

|

——.

3

|

Checking

1.

Apply

a

1

kHz

-23

+3

dBV

Sig-

O+2.5dB

|The

level

difference

between

left

recording

nal

to

the

LINE.

in

terminals,

and

right

channels

for

SF/NORM

level

tape

and

chrome

tape

should

be

less

than

3

dB.

Perform

the

adjustment

using

a

normal

tape,

level

difference

between

recording

and

playback

for

SA/CrO2

and

metal

tapes,

should

be

less

than

3

dB,

and

that

between

left

and

right

channels

should

also

be

less

than

3

dB.

tape;

Less

Less

than

3%

Metal

tape;

Less

than

2%

(THD)

following

bias

current

and

record-

than

2.0%

ing

level

checking.

CrO2

tape;

Be

sure

to

perform

this

checking

5

|

Checking

signal

to

noise

ratio

playback

in

recording/

2.

Play

back

the

recorded

part.

1.

Record

a1

kHz,

0

dB

signal.

Stop

the

input

by

disconnecting

from

the

terminal

to

perform

non-

signal

recording.

Measure

the

O

dB

recording

output

and

the

non-signal

recording

output

for

comparison

using

an

electronic

voltmeter.

Check

to

see

if

the

value

conforms

to

the

standard

value.

NORM,

CrO2

and

Metal

tapes;

||

More

than

42

dB

Apply

an

output

(—72

dBs)

to

the

MIC

terminals

with

the

recording

evel

controls

set

to

maximum

so

that

the

multi-peak

indicator

be-

comes

0

dB.

Checking

erasing

coefficient

8

(No.

4243)

+

1.

Apply

a

1

kHz

signal

to

the

LINE

2.

Perform

recording

with

the

signal

3.

Erase

a

part

of

the

recording.

4.

Measure

the

output

difference

be-

IN

terminals.

Adjust

the

recording

level

controls

until

the

multi-peak

indicator

becomes

0

dB.

enhanced

by

20

cB.

tween

the

erased

part

and

non-

erased

part

to

compare

with

an

electronic

voltmeter.

Ll

More

than

65

dB

For

the

measuring,

connect

a

band

pass

filter

between

the

deck

and

the

electronic

voltmeter.

Tape

deck

(recording,

erasing)

Input

i

(1

kHz

OdB

+

20

dB)

Electronic

voltmeter

Band

pass

filter

(1kHz)

: