JVC TD-W777A Bedienungsanleitung

Dieses Handbuch passt für folgende Modelle

6

Inhaltsverzeichnis

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TD-W7

7

7

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

JVC

SERVICE

MANUAL

Area

suffix

|

A

Austalia

|

ic

Canada

iE

Continental

Europe

|

iG

W.

Germany

lJ

U.S.A.

|

u

Other

Greas

Page

Page

1]

n

2

fio]

Location

of

P.C.

Board

Parts...

20.

0.0

20000..

16

fa

Reatures:

ocd

d.

ole

oe

ele

ep

ee

eR

aS)

PCBoard:Parts:bistasy

f.4

82.

Shee

eee

17

[3]

Specifications

......00.000

00.

0b

eee

ers

fil]

Exploded

View

of

Mechanism

Assembly

.......

21

[4]

Names

of

Controls

and

Their

Functions.

.

.

moped

Mechanism

Assembly

Parts

List

2.0.0.0...

23

[5}-“

Location

of

Main-Parts’

sce.

deere

ee

eee

5

fi2].

Exploded

View

of

Enclosure

Assembly

........

22

[6]

Removal

of

Main

Parts.

......0......

ee

eee

3:

Enclosure

Assembly

Parts

List

......0..00.4.

24

[7]

Main

Adjustments...

0.000000

.020

000002

eae

9

fi3].

Block

Diagram’...

ee

OK

Wiring

Connections...

0.0.00...

0000005.

13

fi4]

Packing

Illustration

and

Parts

List

©...

0.0.00.

26

[9]

Standard

Schematic

Diagrams

......0...00...

1

Accessories

.

0...

ee

ees

27

April.

1988

:

TD-W777

A/B/C/E/G/3/U

|

[1|

Safety

Precautions

.

The

design

of

this

product

contains

special

hardware

and

may

circuits

and

components

specially

for

safety

purposes.

Warning

.

This

equipment

has

been

designed

and

manufactured

to

meet

international

safety

standards.

.

It

is

the

legal

responsibility

of

the

repairer

to

ensure

that

these

safety

standards

are

maintained.

.

Repairs

must

be

made

in

accordance

with

the

relevant

safety

standards.

.

It

is

essential

that

safety

critical

components

are

replaced

by

approved

parts.

.

If

mains

voltage

selector

is

provided,

check

setting

for

local

voltage.

aOhWHND

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.

.

Alterations

of

the

design

or

circuitry

of

the

product

should

not

be

made.

Any

design

alterations

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.

.

Many

electrical

and

mechanical

parts

in

the

product

have

special

safety-related

characteristics.

These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

by

them

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

(

A\)

on

the

Schematic

Diagram

and

Parts

List

in

the

Service

Manual.

The

use

of

a

substitute

replacement

which

does

not

have

the

same

safety

characteristics

as

the

recommended

replacement

part

shown

in

the

Parts

List

of

Service

Manual

may

create

shock,

fire,

or

other

hazards.

.

The

leads

in

the

products

are

routed

and

dressed

with

ties,

clamps,

tubings,

barriers

and

the

like

to

be

separated

from

live

parts,

high

temperature

parts,

moving

parts

and/or

sharp

edges

for

the

prevention

of

electric

shock

and

fire

hazard.

When

service

is

required,

the

original

lead

routing

and

dress

should

be

observed,

and

it

should

be

confirmed

that

they

have

been

returned

to

normal,

after

re-assembling.

.

Leakage

current

check

(Electrical

shock

hazard

testing)

After

re-assembling

the

product,

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

product

(antenna

terminals,

knobs,

metal

cabinet,

screw

heads,

headphone

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.

Using

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.

Any

leakage

current

must

not

exceed

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

more

sensi-

tivity

in

the

following

manner.

Connect

a

1,500

2

10

W

resistor

paralleled

by

a

0.15

uF

AC-type

capacitor

be-

tween

an

exposed

metal

part

and

a

known

good

earth

ground.

Measure

the

AC

voltage

across

the

resistor

with

the

AC

VOLTMETER

AC

voltmeter.

a

(Having

1000

ohms/volt,

:

7

or

more

sensitivity.)

Move

the

resistor

connection

to

each

exposed

metal

part,

particularly

any

exposed

metal

part

having

a

Ca

Geral

return

path

to

the

chassis,

and

measure

the

AC

volt-

oT

BE

SAC

TYPE

age

across

the

resistor.

Now,

reverse

the

plug

in

the

ae

Rinceaneiurabe

AC

outlet

and

repeat

each

measurement.

Any

voltage

©

on

each

exposed

measured

must

not

exceed

0.75

V

AC

(r.m.s.).

This

15002

10W

metal

part.

corresponds

to

0.5

mA

AC

(r.m.s.).

Gadd

eeahgiound

2

(No.

4292)

Features

@

Auto-reverse

mechanism

in

both

decks

e

Flip

reverse

head

system

e

Quick

reverse

mechanism

using

infrared

sensor

@

2-motor

full

logic

mechanism

in

both

decks

e

Motor

used

exclusively

for

the

mechanism

drive

®

Continuous

playback

@

Dolby

B-C

noise

reduction

system

e

Built-in

MPX

filter

@

Centerized

display

using

two-colored

LCDs

e

2-color

peak

level

indicator

e

Electronic

counter

displays

for

the

two

tape

mecha-

nism

e

Dubbing

mode

indicator

Specifications

Type

:

Stereo

double

cassette

deck

Track

system

:

4-track,

2-channel

Tape

speed

:

1-7/8

inch/sec

(4.8

cm/sec)

Frequency

response

:

(—20

dB

recording)

Metal

tape;

20—17,000Hz

30—16,000

Hz

(+3

dB)

Chrome

tape;

20—17,000

Hz

30—15,000

Hz

(+3

dB)

Normal!

tape;

20

—16,000

Hz

30—15,000

Hz

(+3

dB)

:

58

dB

(S

=

1

kHz,

K3

=

3%,

N=

A-

weighted,

Metal

tape)

The

S/N

is

improved

by

about

15

dB

at

500

Hz

and

by

max.

20

dB

at

1kHz

~10kHz

with

Dolby

C

NR

on

and

improved

by

5dB

at

1kHz

and

by

10dB

at

above

5

kHz

with

Dolby

B

NR

on.

Improvement

t

of

MOL

:

4dB

at

10

kHz

with

Dolby

CNR

on

on

Wow

and

flutter

:

0.08%

(WRMS)

Channel

separation

:

40

dB

(1

kHz)

Crosstalk

:

60

dB

(1

kHz)

Harmonic

distortion

:

K3;0.5%,

THD;

1.0%

(metal

tape,

1

kHz,

0

VU)

Heads

:

Deck

A;

METAPERM

head

for

play-

back

x

1

SN

ratio

Deck

B;

METAPERM

head

for

record-

ing/playback,

2-gap

ferrite

head

for

erasure

Combination

head

x

1

—TD-W777

weceann

®

Auto

tape

select

mechanism

for

both

decks

A

and

B

@

Timer

start

mechanism

@

Microcomputer-controlled

mechanisms

e

Auto

record

muting

and

synchro

record

muting

(deck

B)

®@

Single

music

scan

mechanism

for

either

direction

“Under

license

from

Staar

S.A.,

Brussels,

Belgium”

®@

Input

balance

slide

control

and

input

level

slide

control

®@

Synchro

start

(normal-/high-speed)

dubbing

@

COMPU

LINK

control

system

Motors

:

Electronic

governed

DC

motor

for

capstan

x

1

DC

motor

for

reel

x

1

DC

motor

for

mechanism

drive

X

1

(For

both

decks

A

and

B)

Fast

forward/

Rewind

time

Input

terminals

:

Approx.

100

sec

with

C-60

cassette

LINE

IN

:

Min.

input

level;

80

mV

(X1

circuit)

Input

impedance;

50

kQ

Output

terminals

LINE

OUT

:

Output

level;

300

mV

(X1

circuit)

Output

impedance;

5

kQ

PHONES

x

1

:

Output

level;

0.3

mW/8

Q2

Matching

impedance;

8

Q

~

1kQ

Other

terminals

:

COMPU

LINK-1/SYNCHRO

x

2

Power

requirement

TD-W777A/B_

:

AC

240

V,

50/60

Hz

TD-W777E/G

:AC220V,

50/60

Hz

TD-W777C/J

=:

AC

120

V,

60

Hz

TD-W777U

:

AC

230/127/110

V,

50/60

Hz

Power

consumption

:

With

power

switch

on;

18

W

With

power

switch

standby;

1.2

W

Dimensions

(W

x

H

x

D):

435

x

133

x

280

mm

(17-3/16"

x

5-1/4”

x

11-1/16")

Weight

:

4.5

kg

(10

Ibs)

Accessories

:Pinplugcord..............

2

Remote

cable..............

|

Design

and

specifications

are

subject

to

change

without

notice.

(No.

4292)

3

TD-W777

ascrecy

|

[4]

Names

of

Controls

and

Their

Functions

CORR)

yo

ES

Pra

i

i

coe

-

>,

!

>

a,

<J

QUICK

REVERSE

[>

|

|

ua

oe

rae

a

f30

naan

Comsren

~1

EL

OO

SP

San

i

I

=?

WD)

fswg

f

[oem

aoOOMes

BOOS

Po

[ommaomaaem

SOMO

\oeo

F

|

=

y

f

—

>]

§

a

rs

F

me

.

FEC!

PLAY

BACK

DEC

B

ary

a

7

Ul

Ca

a

HM

A

INPUT

LEVEL

wmeletede

Le

ae

REVERSE

MODE

switch

TIMER

switch

POWER

switch

Cassette

holder

(Deck

A)

Multi

mode

display

COUNTER

RESET

buttons

Cassette

holder

(Deck

B)

DOLBY

NR

switch

Headphone

jack

(PHONES)

Cassette

operation

buttons

(Deck

A)

Input

BALANCE

control

SYNCHRO

DUBBING

buttons

INPUT

LEVEL

control

Cassette

operation

buttons

(Deck

B)

@@880E0000909009

4

(No.

4292)

TD-W777

weceesu

'5|

Location

of

Main

Parts

Power

Transformer

Pin

Jack

DOLBY

NR

Board

Ass‘y

Main

P.C.

Board

Ass’y

Mechanism

Ass’y[A]

Mechanism

Ass’‘y

[B]

Front

Section

Rear

Section

Capstan

motor

Play

and

Fast

Forward/Rewind

Arm

Ass’y

Motor

for

Cam

Capstan

motor

Supply

reel

disk

|

Take

up

reel

disk

assy

Motor

for

reel

disk

Belt

Playback

Head

(Mechanism

A)

Rec/Play

&

Erase

head

Cassette

Guide

(Mechanism

B)

Cassette

Guide

Pinch

roller

arm

Ass’y

Flywheel

Ass’y

Flywheel

motor

Bracket

Head

mounting

base

Ass’y

Pinch

roller

Cam

Fig.

5-1

(No.

4292)

5

TD-W777

A/B/C/E/G/3/U

|

Removal

of

Main

Parts

1.

Removal

of

Enclosure

parts

(1)

Top

cover

1)

Remove

four

screws

M2

retaining

the

both

sides

of

the

top

cover.

2)

Remove

two

screws

8)

retaining

the

back

side

of

the

top

cover.

Top

Cover

(2)

Bottom

cover

Remove

two

screws

@

retaining

the

bottom

cover.

(3)

Rear

panel

1)

Remove

two

screws

40,

)

retaining

the

rear

panel

and

side

chassis.

2)

Remove

a

screw

@2

retaining

the

synchro

terminal.

3)

Remove

two

screws

retaining

the

heat

sink.

4)

Remove

a

screw

retaining

the

pin

jack.

(4)

Side

chassis

(L)

1)

Remove

two

screws

retaining

the

front

pane!

and

side

chassis

(L).

2)

Remove

a

screw

40

retaining

the

rear

panel.

(5)

Side

chassis

(R)

1)

Remove

two

screws

@

retaining

the

front

panel.

2)

Remove

a

screw

(5)

retaining

the

main

board

ass’y.

(6)

Power

board

ass’y

1)

Remove

two

screws

retaining

the

voltage

selector.

2)

Remove

four

screws

,

@

retaining

the

power

transformer.

(7)

Main

P.C.

board

ass’y

Remove

a

screw

retaining

the

mechanism

and

main

P.C.

board.

(8)

Mechanism

ass’y

1)

Remove

four

screws

@1),

Q2

retaining

the

mecha-

nism

ass’y

[A].

2)

Remove

four

screws

@3)

;

Q4

retaining

the

mecha-

nism

ass’y

[B].

6

(No.

4299)

Synchro

Terminal

Main

P

C.

Board

Ass'y

@

Mechanism

Section

Mechanism

[B]:

Refer

to

the

description

about

REC/PB

mechanism.

®

Head

ass’y

Remove

two

screws

@

retaining

the

head

ass’y.

For

removing

the

head

only,

remove

two

screws

securing

it

from

the

head

gap

side.

(To

do

the

work

easily,

heat

the

bonded

parts

beforehand.)

e

Re-assembling

1.

Set

the

head

lever

to

be

positioned

as

shown

in

the

figure.

2.

Arrange

head

wires

and

apply

locking

bond.

In

case

of

Mechanism

/A|

Loosen

a

screw

on

the

left

side

of

the

PB

head

and

remove

a

screw

on

the

right

side.

For

a

dummy

head,

remove

a

screw

securing

it.

@

Pinch

roller

ass’y

Push

a

pawl

catching

the

pinch

roller

ass’y

on

the

chassis

in

the

direction

of

the

arrow

mark

(see

figure)

to

remove

it.

@

Flywheel

bracket

(FM

bracket)

Remove

two

screws

@)

securing

the

flywheel

bracket,

from

the

both

sides.

When

the

FM

bracket

is

removed,

the

main

belt

is

dis-

engaged

at

the

same

time.

The

capstan

motor

and

flywheel

ass’y

can

be

replaced

by

this

procedure.

®@

Disk

base

unit

Remove

three

screws

@),

@

and

®©

securing

the

disk

base

unit,

Belt

TD-W7

7

7

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

Fig.

6-11

(No.

4292)

7

TD-W777

wevcrercisu

e

Re-assembling

of

disk

base

unit

1,

Re-assemble

the

disk

base

unit

in

order

of

numbers

(D—

@®)

shown

in

the

figure.

a)

When

setting

the

cam

gear

(1),

make

sure

of

its

posi-

tioning

so

that

the

gear’s

wide

side

makes

aright

angle

with

the

disk

while

its

small

side

is

in

parallel

with

the

disk

as

shown

in

the

figure.

b)

Engage

the

gears

@),

@)

and

@

each

other.

c)

When

putting

back

the

head

base

cam

5,

pay

careful

attention

to

positioning

it

so

that

big

and

small

con-

caves

are

paralleled

with

the

disk.

2.

Turn

the

gear

2

@

in

the

direction

of

the

arrow

mark,

and

stop

turning

when

the

cam

gear

@

and

the

head

base

cam

()

are

free

from

each

other

(slit

of

the

head

base

cam

can

be

seen

on

the

opposite

side).

e

Fixing

disk

base

unit

to

chassis

Join

together

the

head

base

cam

and

the

pinch

roller

cam

so

as

to

catch

on

each

other

by

the

slits.

Helical

Gear

—

Pinch

Roller

Cam

8

(No.

4292)

Gear's

wide

side

makes

a

righ

angle

with

the

disk.

Gear’s

small

side

is

paralleled

wi

the

disk.

Fig.

6-12

4

(

elical

Gear

Gear

4)

Gear

2

Fig.

6-13

Small

hole

Put

together

by

fitting

the

rugged-

ness

in

each

other.

Fig.

6-14

Set

head

base

cam

and

pinch

roller

cam

by

the

slits.

Fig.

6-15

TD-W77

7

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

Main

Adjustments

1.

Equipment

and

measuring

instruments

used

for

adjustments

1)

Electronic

voltmeter

7)

Distortion

meter

(bandpass

filter)

2)

Audio

frequency

oscillator

8)

Torque

testing

cassette

gauge,

CGT-N

(range:

50—20

kHz

and

output

0

dB

with

impedance

of

600

2)

9)

Wow

flutter

meter

3)

Attenuator

(impedance:

600

22)

10)

Frequency

counter

4)Standard

tape

for

REC/PB

Maxell

UD1

(TS-9)

—

Normal

(SF)

tape

TDK

SA

’

—

Chroma

(SA)

tape

—

or

equivalent

=

Power

sources

JVC

ME

—

Metal

tape

Set

the

line

voltage

selector

switch

to

240

V/230

V/

5)

Reference

tape

for

playback

(JVC

Test

Tape)

220

V/127

V/120

V/110

V

according

to

your

local

VTT712

(for

tape

speed,

wow

flutter

adj.)

voltage.

V11724

(for

playback

level)

AC

240

V,

50/60

Hz

(TD-W777A/B)

VTT739

(for

playback

frequency

response)

AC

220

V,

50/60

Hz

(TD-W777E/G)

6)

Resistor

600

Q

(for

attenuator

matching)

AC

230

V/127

V/110

V,

50/60

Hz

(TD-W777U)

2.

Mechanism

adjustment

procedure

®

Notice:

0

dBs

=

0.775

(V)

Item

|

Adjustment

Adjus

ring

Standard

Remarks

point

value

Adjusting

1.

Connect

a

frequency

counter

to

the

|

Deck

{A):

Normal

For

adjusting

high

speed,

TP

bus

motor

speed

LINE

OUT

terminals.

Normal;

VR702

speed:

wire

should

be

grounded.

Adjust

2.

Play

back

the

VTT712

test

tape.

High;

VR701

Deck

[A];

high

speed

after

perform

normal

3.

Adjust

for

deck

[A]:

3000

+

15

Hz!

speed.

Adjust

VR701

for

normal

speed

at

{Deck

[B):

Deck

[B];

3000

Hz,

and

VR702

for

high

speed

at

|

Normal;

VR704|

3000

+15

Hz

6000

Hz.

High;

VR703

High

speed:

Adjust

for

deck

[B]:

Deck

(Al:

Adjust

VR703

for

normal

speed

at

6000

+15Hz

3000

Hz,

and

VR704

for

high

speed

at

Deck

[B];

6000

Hz.

6000

+15

Hz

Checking

Connect

a

wow

and

flutter

meter

to

LINE

0.15%

If

the

reading

becomes

moving

wow

and

OUT

terminals.

Play

back

the

VTT712

(WRMS)

jvalue

even

if

confirming

to

the

flutter

test

tape.

Check

to

see

if

the

reading

of

standard,

a

reclaim

may

be

raised.

the

meter

is

within

0.15%

(WRMS).

Repairs

are

necessary.

Checking

Employ

a

torque

testing

cassette

tape

for

30—70

gr-cm

|

If

the

standard

torque

is

not

ob-

playback

the

checking,

or

remove

the

cassette

cover

tained,

replace

the

take-up

disk

torque

and

use

a

torque

gauge.

|

assembly.

Checking

Measure

the

torque

in

the

fast

forward

70—200

gr-cm|

If

the

standard

torque

is

not

ob-

fast

forward

|

mode

in

the

same

manner

as

in

the

above.

tained,

perform

the

following.

torque

1.

Clean

the

capstan

belt,

the

idler

circumference,

the

motor

pulley,

the

take-up

reel

disk

circumference,

the

flywheel

circumference,

etc.

2.

Replace

the

belt

and

idler.

Checking

Measure

the

torque

in

the

rewind

mode

ies

gr-cm|

If

the

standard

torque

is

not

ob-

rewind

in

the

same

manner

as

in

the

above.

tained,

clean

the

capstan

belt,

torque

idler,

motor

pulley,

flywheel

cir-

cumference,

rewinding

idler

cir-

cumference,

left

reel

disk

circum-

ference,

etc.

(No.

4292)

9

TD-W7

7

7

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

Adjustment

Standard

value

Adjusting

point

Remarks

.

Connect

an

electronic

voltmeter

to

the

LINE

OUT

terminals.

.

Playback

the

VTT

703

test

tape.

.

Adjust

the

head

angle

with

the

screw

(FWD

and

REV)

until

the

reading

of

the

electronic

voltmeter

becomes

maxi-

mum

for

both

channels.

Adjusting

Head

azimuth

Adjust

the

head

angle

with

the

screw

®

until

the

reading

of

the

electronic

voltmeter

becomes

maximum

for

both

channels.

Screws

Maximum

(FWD,

REV)

Deck

Deck

Fwo

Deck

REV

Adj.

FwOo

3.

Electrical

adjustments

location

e

Main

Amp.

P.C.

Board

(parts

assembly

side

view)

(Turning

in

the

direction

of

the

arrow

increases

the

level.)

DECK

A

OECK

A

b,

FRONT

10

(No.

4292)

HIGH

SPEED

Adj

NORMAL

SPEED

Adj

Ene

HIGH

SPEED

TP

When

high

speed

adjustment

connect

the

bus

wire

to

ground

DECK

B

HIGH

SPEED

Adj

DECK

B

NORMAL

SPEED

Adj

Leh

DECK

B

PB

EQ

Adj

Rech

BIAS.

CURRENT

Adj

cel

BIAS

CUT

7]

BIAS

FREQUENCY

Adj

Fig.

7-1

ot:

e)

RIO?

1

ch

PB

LEVEL

Adj

DECK

A

rs

R

s

ae

202

pop

,

PB

LEVEL

Adj

VRIOI

ich

PB

LEVEL

Adj

DECK

8

a

;

WF

ov

ich

~1d8

448

20!

Rech

PB

LEVEL

Adj

VRIO3

Lch

REC

LEVEL

Adj

DECK

B

oe

03

Leh

REC

LEVEL

Adj