JVC RC-W410 User manual

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RC-W410

wesaavvvx

JVC

ERVICE

MANUAL

Area

suffix

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oad

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hak

&

UK

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Continental

Europe

Gee

RN

a

A

eR

as

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Germany

Glo

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G28

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Italy

VINX:

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Eastern

Europe

Contents

Page

[1]

Safety

Precautions...........

0.0000

eee

eee

2

(9!

Wiring

Connections

.....-......0.00

00000005

15

1D)

“Features:

uci

bed

an

goa

eae

ke

be

4

10,

Standard

Schematic

Diagram

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

16

(3)

Specifications

.......

0.000.000

eee

eee

4

(11)

Location

of

P.C.

Board

and

Parts

List

..........

18

[4]

Names

of

Control

and

Their

Functions.

......---

5

12]

Exploded

View

of

Enclosure

Assembly

.........--

25

{5]

Location

of

Main

Parts

...........0+00000

00

6

13)

Exploded

View

of

Mechanism

Assembly

.......

-

27

(6!

Removal

of

Main

Parts...........-0000

000005

8

14)

Packing

Illustration

and

Parts

List

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

30

(7)

Main

Adjustment

........0....0.20222

0000s

10

(5|

Accessories...

0.0.0.0

ee

eee

31

8]

Block

Diagrams.

342-40

cae

eet

ee

RE

14

No.

1768

February

1989

RC-W410

sevcavvvx

|

'1|

Safety

Precautions

1.

OhWNH

Warning

.

This

equipment

has

been

designed

and

manufactured

to

meet

international

safety

standards.

.

It

is

the

legal

responsibility

of

the

repairer

to

ensure

that

thése

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.

The

design

of

this

product

contains

special

hardware

and

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.

.

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

Piug

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.ms.).

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.

i

(Having

1000

ohms/volt,

:

F

or

more

sensitivity.)

Move

the

resistor

connection

to

each

exposed

metal

part,

particularly

any

exposed

metal

part

having

a

SS

ee

AP

return

path

to

the

chassis,

and

measure

the

AC

volt-

Out

Sah

GT

PE

age

across

the

resistor.

Now,

reverse

the

plug

in

the

biageahiepiewe

AC

outlet

and

repeat

each

measurement.

Any

voltage

on

each

exposed

measured

must

not

exceed

0.75

V

AC

(r.m.s.).

This

15009

10W

metal

part.

corresponds

to

0.5

mA

AC

(r.m.s.).

4h

—--

Good

earth

ground

2

(No.

1768)

RC-W410

B/E/G/GI/V/VX

|

SAFETY

PRECAUTIONS

ABOUT

RC-W410

|

1.

Since

diodes

D901, D902,

D903

and

D904

are

heating

units,

wires

are

arranged

not

to

touch

them

as

shown

in

Fig.

1-1

©.

Confirm

that

those

parts

are

set

vertically.

Power

Supply

Board

2.

Check

up

wires

connected

to

the

power

transformer,

which

must

be

bound

together

with

as

shown

in

Fig.

1-1

O.

4PIN

Connector

to

Power

Amplifier

Board

3.

Check

up

that

single

wires

coming

from

a

P.C.

board

are

bound

together

with

at

the

collective

root

near

the

board

as

shown

in

Fig,

1-1

Q).

Power

Trans

4.

Check

up

that

all

wires

of

motors

and

leaf

switches

are

bound

and

secured

with

spacers

at

specific

points

respec-

tively.

(See

Fig.

1-2

@

and

©)

Mechanism

Fig.

1-2

5.

Make

sure

of

speaker

wires

which

should

be

soldered

as

they

are

twisted

with

each

other

as

shown

in

Fig.

1-3

©.

Speaker

00

(ey

6

FT

6

Fig.

1-3

(No.

1768)

3

RC-W410

B/E/G/GI/V/VX

|

[2]

Features

Hyper-Bass

Sound

System

with

3D

on/off

switch

Three-band

(FM/MW/LW)

synthesizer

tuner

with

Five-stations

in

each

band

(FM1,

FM2,

MW

and

LW)

preset

capability

4-element

S.E.A.

graphic

equalizer

Full

auto-stop

mechanism

Synchro-start

high-speed

dubbing

Relay

play

between

two

decks

'3]

Specifications

Tuner

section

Frequency

rranges

:

FM

87.5—108

MHz

MW

522-1629

kHz

LW

144-290

kHz

Antennas

:

Telescopic

antenna

for

FM

Ferrite

core

antenna

for

MW

&

LW

Tape

Recorder

section

Track

system

:

4-track

2-channel

stereo

Frequency

response

:

80—12,500

Hz

Wow

&

flutter

:

0.15

%

(WRMS)

Fast

wind

time

:

Approx.

120

sec

(C-60

cassette)

General

3D

system

:

ASW

(Acoustic

Super

Woofer)

Speakers

:

10cm

x

2

Power

output

:

7.0

W

(3.5

W

+

3.5

W)

at

8

Q

and

8.0

W

for

3D

at

12

22

(Max.)

4.0

W

(2.0

W

+

2.0

W)

at

8

Q

and

6.0

W

for

3D

at

12

2

(10%

THD)

S.E.A.

characteristics

S.E.A.

center

frequencies

:

100

Hz/330

Hz/2

kHz/10

kHz

S.E.A.

control

range

:£8

dB

Input

jack

:

MIX

MIC

x

1

(3

mV/—50

dBV,

200

2

—

2

kQ)

Output

jack

:

Headphones

x

1

(20

mW/32

Q,

8Q—1kQ)

Power

supply

:DC

12

V

(8

“R20”

cells)

AC

220—240

V/110—120

V,

50/60

Hz

(RC-W410E

only)

Ext.

DC

IN

12

V

(car

battery

via

optional

CN-332

car

adapter)

Power

consumption

:

18

W

Dimensions

:

560(W)

x

167(H)

x

153(D)

mm

(including

knobs)

Weight

:

Approx.

3.9

kg

(without

batteries)

Design

and

specifications

are

subject

to

change

without

notice.

4

(No.

1768)

|

RC-W410

B/E/G/GI/V/VX

4)

Names

of

Controls

and

Their

Functions

1

bo

©

Gg

OGOdG

Z

a,

__|

Pe

|

h

y

/

am

Cen

en

Ta

EY

NN

we

[jee

Wr

Ic

51

Farce

rae

Cp

tr

tt

Jit

eee

SISO

Rare,

CMR

OL

WOO

RESO

estes

KK

Seeeeees

Fig.

4-2

@

Cassette

operation

buttons

(Deck

A)

@

LCD

digital

display

@/4

STOP/EJECT

button

Band

indicator

(FM1-FM2-MW-LW)

44

FF

button

Radio

frequency

display

PP

REW

button

Preset

station

indicator

“4

PLAY

button

FM

stereo

(STEREO)

indicator

@

Cassette

operation

buttons

(Deck

B)

@

BAND

button

§8

PAUSE

button

®

TUNING

control

@/&

STOP/EJECT

button

¥

DOWN

frequency

44

FF

button

A

UP

frequency

PP

REW

button

g

Cassette

holder

(Deck

B)

“@

PLAY

button

PHONES

jack

(3.5

mm

dia.

stereo

mini)

OREC

button

@

MIX

MIC

jack

(3.5

mm

dia.

mini)

8

TAPE/FM

MODE

switch

@

Telescopic

antenna

FUNCTION

switch

@

BEAT

CUT

switch

@

3D

(HYPER-BASS

SOUND)

switch

@

VOLTAGE

SELECTOR/AC

IN

(AC

input)

jack

@

4-BAND

GRAPHIC

EQUALIZER

(S.E.A.)

controls

@

DC

IN

12

V

jack

(©-2-@

)

(RC-W410E

only)

g

VOLUME

control

@

Battery

compartment

cover

Preset

station

button

°

PRESET

SCAN

button

Cassette

holder

(Deck

A)

(No.

1768)

5

RC-W410

B/E/G/GI/V/VX

|

[5|

Location

of

Main

Parts

Amplifier

Board

Tuner Board

Power

Amplifier

Mechnism

Ass’y

‘Speaker

Board

Fig.

5-1

Battery

Contact

Board

Rod

Antenna

GHEE

TAT

PELL

Battery

Contact

Board

Bilt

in

Subwoofer

IRedmSide

AC

Socket

Power

Supply

Board

Power

Transformer

Fig.

5-2

6

(No.

1768)

@

Mechanism

Ass’y

PB

HEAD

Bottom

View

[A]

Mecha

Button

FF

PLAY

STOP/

EJECT

|

REW

Reel

Disk

Ass'y

Motor

Ass’y

Fig.

5-3

RC-W410

B/E/G/GI/V/VX

[B}

Mecha

Button

STOP/

REW

REC

EJECT

R/P

HEAD

Reel

Disk

Ass‘y

RF

Cam

Gear

Flywheel

Ass’y

Fig.

5-4

RF

Cam

Gear

Flywheel

Ass'y

(No.

1768)

7

RC-W410

B/E/G/GI/V/VX

©

|

6)

Removal

of

Main

Parts

Rear

Cabinet

Ass’y

‘

Remove

six

screws

(1)

(M3

x

20)

and

@)

(M3

x

44)

which

secure

the

rear

cabinet

ass’y

at

the

points

indicated

by

A

marks.

2.

In

the

course

of

detaching

the

rear

cabinet

ass’y,

dis-

connect

the

antenna

lead

which

is

wired

to

the

tuner

board

from

TP1.

3.

Disconnect

a

connector

CN901

from

the

power

amplifier

board,

M3x

20

Fig. 6-1

B®

Speaker

Unit

for

Hyper-Bass

Sound

1.

Release

the

wire

between

the

battery

contact

board

and

the

power

supply

board

from

the

guide

for

wire

arrange-

ment.

2,

Release

the

wire

from

three

wire

clamps

located

by

the

right

speaker.

3.

Remove

five

screws

)

(M3

x

16)

and

six

screws

@

(m3

x

16)

securing

the

hyper-bass

sound

box.

Therefore,

the

speaker

unit

can

be

seen.

4.

By

removing

eight

screws

®

(M3

x

16)

from

the

hyper-

bass

sound

box,

the

speaker

unit

can

be

taken

offm3

x

16

Guide

for

wire

arrangement

(3)

M3

x

16

Fig.

6-2b

AB

8

(No.

1768)

=

Tuner

Board

Draw

out

the

tuner

board

along

the

groove

of

the

front

cabinet

ass’y.

Main

Board

and

Power

Amplifier

Board

.

Remove

three

knobs

of

the

slide

switches:

TAPE/FM

MODE,

FUNCTION

and

3D

selectors.

.

Release

the

wire

from

three

wire

clamps

located

by

the

right

speaker.

.

Remove

adhesive

tape

securing

the

wire

to

the

main

board.

.

Remove

two

screws

©

(M3

x

45)

and

®

(M3

x

45,

black)

securing

the

main

board

and

power

amplifier.

.

Detach

the

PHONES

jack

first,

then

the

volume

control

and

SEA

switch,

etc.

one

after

another,

and

lastly

take

off

the

boards.

.

Disconnect

connectors

CN103,

CN902,

CN101,

CN102

and

CN401

from

the

Main

board.

Mechanism

Ass’y

.

Remove

the

tuner

board

and

amplifier

board.

.

Remove

nine

screws

(M3

x

10)

and

@)

(M3

x

25)

securing

the

mechanism

ass’y.

.

Draw

out

the

Rec.

lever.

Operation

Buttons

Remove

ten

screws

(M2

x

4)

securing

operation

buttons

to

the

mechanism.

Synthesizer/LCD

Board

Remove

two

screws

@

(M3

x

8)

securing

the

Synthesizer/

LCD

board.

Power

Transformer

and

Power

Supply

Board

(Fig.

6-2b)

.

Remove

three

screws

®

retaining

the

power

transformer

and

power

supply

board.

.

Remove

two

screws

from

transformer

bracket.

(When

re-assembling,

make

sure

of

the

correct

direction

to

set

the

transformer

bracket.)

RC-W410.

secon

M3x25

M3x10

(No.

1768)

9

RC-W410

secon

|

Main

Adjustments

(1)

Equipment

and

Measuring

Instrument

used

for

Adjustments

e

Electronic

voltmeter

e

Wow-flutter

meter

e

Torque

testing

cassette

gauge

CTG-N

e

Audio

frequency

oscillator

e

Frequency

counter

e

Alignment

tape

e

Attenuator

e

Standard

signal

generator

e

Measuring

tape

:

TS-8

(UR)

(2)

Function

of

Cassette

®

Condition

for

Measurement

Power

supply

......

AC

220—240

V/110—120

V

(50/60

Hz)

Function

position

..TAPE/FM

MODE:

TAPE

NORMAL

DC12V

FUNCTION

:

NORMAL

SPEED

Reference

output

...

Speaker

:

OdBs

(0.775

V)/8

2

SEA

:

Center

Headphone

:

—13

dBs

(0.173

V)/32

Q

3D

:

OFF

3D

2120

BEAT

CUT

>:

NORMAL

Reference

Input

....

Ext.MIC

:

—46dBs

e

Routine

of

Check

and

Adjustment

No.

Item

bi

aay

Check

and

Adjustment

Adjusting

Point

1

|

Tape

speed

and

VTT712

Play

back

the

end

portion

of

the

VTT712

test

tape

and

check

Wow-fiutter

(3

kHz)

up

the

following

standards.

check

-

adjustment

e

B

Deck

:

at

Normal

speed

3000

Hz

+

30

Hz

VR331

at

Normal

speed

Less

than

0.38%

(JIS

UNWTD)

Check

e

A

Deck

:

at

Normal

speed

+80

Hz

against

B

Deck

Check

at

Normal

speed

Less

than

0.38%

(JIS

UNWTD)

Check

C

2

|

High-speed

and

VTT712

1)

Loading

VTT712

on

A

Deck

and

Blank

tape

TS-8(UR)

on

B

Synchro

dubbing

|

(3

kHz)

deck.

check

TS-8

(UR)

2)

Function

position

:

HIGH

SPEED

3)

B

Deck

:

REC/PAUSE

4)

B

Deck

pause

to

be

released

when

playing

A

Deck,

then

start

High-speed

dubbing.

5)

High

speed

:

Within

5600

Hz

+

400

Hz

to

be

check

Check

3

VTT703L

1)

Play

back

VTT703L,

both

A

and

B

Deck.

Head

azimuth

Left

side

screw

adjustment

(10

kHz)

2)

Obtain

maximum

Playback

output

for

this

adjustment.

of

PB

or

R/P

3)

Phase

difference

to

be

minimized.

head

4)

Screw

lock

to

be

applied

after

adjustment.

4

|

Playback

out-

VTT724

Play

back

the

VTT724

tape

on

B

Deck

and

confirm

that

level

Check

put

level

(1

kHz)

difference

between

R

and

L

channels

is

within

4

dB.

check

(Measuring

point

:

Headphone

output)

5

|

Playback

VTT736

1)

Play

back

VTT736

difference

level

against

1

kHz.

frequency

(1kHz/125Hz,

A

Deck,

BDeck.....

Measuring

point

:

Headphone

output

Check

characteristics

1kHz/8

kHz)

1kHz/125

Hz:

O0dB+4dB

1kHz/8kHz

:

1dB+4dB

2)

Tape

mode

switched

to

Metal/CrO,

Play

back

VTT736

and

check

the

difference

between

1

kHz

and

8

kHz

at

Headphone

output.

B

Deck

:

within

—1

dB

+3

dB

Check

_|

6

|

Bias

frequency

1)

B

Deck

:

REC

mode,

Beat

Cut

:

Position

1

2)

Leakage

of

Bias

at

Headphone

to

be

checked

with

frequency

counter.

72

kHz

+

3

kHz

to

be

adjusted

with

L321

L321

3)

Bias

frequency

to

be

checked

for

beat

cut

position

2

and

position

3.

Position

2

:

70

kHz

+3

kHz

Position

3

:

68

kHz

+

3

kHz

7

|

Rec/Playback

TS-8

(UR)

Reference

signal

—20

dB

to

be

applied

to

Mic,

and

difference

frequency

level

between

125

Hz

and

8

kHz

against

1

kHz

to

be

checked.

characteristics

1kHz/125

Hz:

—2dB+4dB

Check

1kHz/8kHz

:

+2

dB*§

dB

—_______+

8

|

Maximum

output

|

VTT722

Play

back

VTT722.

Measuring

point

:

Headphone

output

&

Output

more

than

28

mW

(0.95

V)

at

SEA

max.

_|_

Check

10

(No.

1768)