Akai VS-2EGN Manuel utilisateur

Noz2-s;,

AKAT

Servite

manu

VIDEO

CASSETTE

RECORDER

move.

§=2EGN

system)

8S.

Koni

DER

ETRE

1000

BERLIN

‘wen.

area

Sana

Yosgad

VIDEO

CASSETTE

RECORDER

mopeLVS-2EGN(5

System)

SECTION

SERVICEMANUAL

.........---.+--++-

SECTION

PARTSLIST

........--.

20522202

eeeeee

141

SECTION

SCHEMATIC

DIAGRAM

............+++-

160

SAFETY

INSTRUCTIONS

SAFETY

CHECK AFTER

SERVICING

Confirm

the

specified

insulation

resistance

between

power

cord

plug

prongs

and

externally

exposed

parts

the

set

greater

than

Mohms,

but

for

equipment

with

external

antenna

terminals

(tuner,

receiver,

etc.)

and

intended

for

[C]

Specified

insulation

resistance

should

than

2.2

Mohms

(ground

terminals,

microphone

jacks,

headphone

jacks.

line-in-out

jacks

etc.)

PRECAUTIONS

DURING

SERVICING

ower

Parts

identified

the

symbol

parts

are

critical

for

safety.

Replace

only

with

parts

number

specified.

addition

safety,

other

parts

and

assemblies

are

specified

for

conformance

with

such

regulations

those

applying

spurious

radiation.

These

must

also

replaced

only

with

specified

replacements.

Examples:

converters,

tuner

units,

antenna

selector

switches,

cables,

noise

blocking

capacitors,

noise

blocking

filters,

etc.

Use

specified

internal

wiring.

Note

especially:

Wires

covered

with

PVC

tubing

Double

insulated

wires

High

voltage

leads

Use

specified

insulating

materials

for

hazardous

live

parts.

Note

especially:

Insulation

Tape

PVC

tubing

Spacers

(Insulating

Barriers)

Insulation

sheets

for

transistors

Plastic

screws

for

fixing

microswitch

(especially

turntable)

When

replacing

primary

side

components

(transformers,

power

cords,

noise

blocking

capacitors,

etc.),

wrap

ends

wires

securely

about

the

terminals

before

soldering.

Observe

that

wires

not

contact

heat

producing

parts

(heatsinks,

oxide

metal

film

resistors,

fusible

resistors,

etc.).

Check

that

replaced

wires

not

contact

sharp

edged

pointed

parts.

Also

check

areas

surrounding

repaired

locations.

Use

care

that

foreign

objects

(screws,

solder

droplets,

etc.)

not

remain

inside

the

set.

SECTION

SERVICE

MANUAL

TABLE

CONTENTS

SPECIFICATIONS

Ul.

OPERATING

PROCEDURE

RECORDING

9°

PLAVYBAGR

asic

ees

aici

Ill.

DISMANTLING

UNIT

.......

IV.

CONTROLS

............-.5-

PRINCIPAL

PARTS

LOCATION

VI.

VOLTAGE

CONVERSION

...........

VII,

CIRCUIT

DESCRIPTION

GENERAL

VS-2EGN

VIDEO

CIRCUIT

OPERATION

SERVO

CIRCUIT

OPERATION

MECHANISM

DRIVE

OPERATION

CIRCUIT

THE

POWER/SYSCON

CIRCUIT

AUDIO/VIDEO

PRE-AMP

CIRCUIT

BOOSTER

CIRCUIT

CONVERTER

FUNCTIONS

AND

CIRCUITS

10.

TUNER

(FRONT

END)

FUNCTIONS

AND

CIRCUITS

. .

11,

DEMODULATOR

FUNCTIONS

AND

CIRCUITS

VIII.

MECHANICAL

ADJUSTMENTS

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

TENSION

LEVER

POSITION

ADJUSTME

BACK

TENSION

ADJUSTMENT

...

Lara

pant

CHECK

THE

VARIOUS

TORQUES

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

IX.

REPLACEMENT

VIDEO

HEAD

ASSEMBLY

TAPE

TRANSPORT

ADJUSTMENT

TAPE

GUIDE

HEIGHT

ADJUSTMENT

GUIDE

ROLLER

HEIGHT

ADJUSTMENT

AUDIO/CONTROL

HEAD

HEIGHT,

TILT

AND

AZIMUTH

ADJUSTMENT

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

103

CONTROL

HEAD

POSITION

ADJUSTMENT

2...

6-6

eee

ADJUSTMENT

QUICK

FINDER

(REVIEW)

RUN

...

XI.

ELECTRICAL

ADJUSTMENT

SERVO

P.C

BOARD

ADJUSTMENT

VIDEO

(EGN)

P.C

BOARD

ADJUSTMENT

EGN

P.C

BOARD

ADJUSTMENT

AUDIO/PRE

P.C

BOARD

ADJUSTMENT

DEMODULATOR

P.C

BOARD

ADJUSTMENT

XII.

VARIOUS

WAVEFORMS

EACH

TEST

POINT

SERVO

P.C

BOARD

VIDEO

P.C

BOARD

EGNP.C

BOARD

....

XII.

P.C

BOARD

TITLES

AND

IDENTIFICATION

NUMBERS

XIV.

COMPOSITION.OF

VARIOUS

P.C

BOARDS

For

basic

adjustments,

measuring

methods,

and

operating

principles,

refer

GENERAL

TECHNICAL

MANUAL.

Service

Manual

VS-2EGN

SPECIFICATIONS

FORMAT

VHS

Standard

VIDEO

RECORDING

SYSTEM

Rotary,

slant

azimuth

two-head

helical

scan

system

INPUT

System

(PAL,

SECAM)

VHF

UHF

OUTPUT

System

type

modulation

UHF

adjustable

(preset

36)

RECORDING

(LINE

INPUT)

PAL,

System

G,I

SECAM,

System

NTSC,

4.43

MHz

NTSC,

3.58

MHz

PLAYBACK

(LINE

OUTPUT)

PAL,

System

B,G,1

SECAM,

System

SECAM,

System

NTSC,

4.43

MHz

NTSC,

3.58

MHz

VIDEO

LINE

INPUT

LEVEL

0.5

2.0

Vp-p/75

ohms

unbalanced

LINE

OUTPUT

LEVEL

1.0

Vp-p/75

ohms

unbalanced

S/N

than

HORIZONTAL

RESOLUTION

than

250

lines

(PAL)

than

220

lines

(SECAM)

than

220

lines

(NTSC)

AUDIO

LINE

INPUT

LEVEL

—20

dBs/50

kohms

unbalanced

LINE

OUTPUT

LEVEL

—6

dBs/1

kohm

unbalanced

S/N

than

FREQUENCY

RESPONSE

kHz

RECORDING

PLAYBACK

TIME

240

min.

with

E-240

cassette

(PAL,

SECAM)

168

min.

with

E-240

cassette

(NTSC)

160

min. with

T-160

cassette

(NTSC)

TAPE

SPEED

23.39

mm/sec.

(PAL,

SECAM)

33.35

mm/sec.

(NTSC,

“standard

play”

mode

only)

QUICK

FINDER

PAL/SECAM

Approx.

times

the

normal

speed

(noise

bars

fixed)

NTSC

Approx.

times

the

normal

speed

(noise

bars

fixed)

FF.,

RWD

TIME

min.

with

E-240

cassette

TIMER

PROGRAMS

Nine

4-week-one

time

memory

programs

and

one

shut-off

pro-

gram

CLOCK

REFERENCE

Locked

power

line

frequency

(50/60

Hz)

DISPLAY

screen

(Tape

counter,

Timer,

Clock

and

Calendar)

POWER

REQUIREMENTS

110

(100—120)/220

(200—240)V,

50/60

POWER

CONSUMPTION

watts

OPERATING

TEMPERATURE

5°C

40°C

DIMENSIONS

440(W)

133(H)

360(D)

WEIGHT

10.5

For

improvement

purposes,

design

and

specifications

are

subject

change

without

notice.

Service

Manual

VS-2EGN

it.

OPERATING

PROCEDURE

RECORDING

From

built-in

Tuner

(To

record

programs)

SIGNAL

FOR

RECORDED.

TAPE

PAL

B/G

ve_

position

VS~2EGN

RECORDING

NOTE

SECAM

B/G

SECAM

B/G

)

(Mice

East

SECAM

(aiaate

East

SECAM

NOTE

The

PAL

color

system

which

used

U.K

and

Hong

Kong

cannot

recorded

through

the

built-in

tuner.

From

source

connected

VIDEO

jack

SIGNAL

FOR

RECORDING

RECORDED

TAPE

PAL

B/G

B/G/H/1

POSITION

SECAM

B/G

(iicale

aie

SECAM

B/G

(Migate

East)

SECAM

(

Frenchy

SECAM

POSITION

NTSC

3.58

3.58MHz

POSITION

Service

Manual

VS-2EGN

———————————

esse

PLAYBACK

connected

OUT

jack

RECORDED

TAPE

PAL

B/G

POSITION

SECAM

B/G

(iiadle

East

SECAM

B/G

POSITION

NTSC

4.43

POSITION

SECAM

POSITION

NOTE

SECAM

POSITION

NTSC

4.43

POSITION

SECAM

POSITION

NOTE

Use

which

can

receive

the

PAL

B/G

color

system.

which

can

receive

the

PAL

color

system

used

sound

will

heard.

connected

VIDEO

OUT

jack

RECORDED

TAPE

SECAM

B/G

(Missle

East

SECAM

(Eeeneh.

SECAM

NTSC

B/G

POSITION

PAL

B/G

POSITION

SECAM

POSITION

NTSC

3.58

POSITION

4.43

POSITION

Service

Manual

VS-2EGN

PAL

POSITION

SECAM

B/G

POSITION

SECAM

POSITION

NTSC

3,58

5-WAY

POSITION

NTSC

4.43

SeWay.

POSITION

DISMANTLING

UNIT

case

trouble,

etc.

necessitating

dismantling,

please

dismantle

the

order

shown

the

photographs.

Reassemble

reverse

order,

FRONT

PANEL

—:

‘SCREWS

CASSETTE

LID

SCREW

2 5

UPPER

CASE

‘SCREWS

SCREWS

3 6

-_oo

Service

Manual

VS-2EGN

Iv.

CONTROLS

ONOINBHARONS|

10.

11.

Fig.

4-1

Controls

(Front

View)

FUNCTION

“OFF/TIMER”

BUTTON

FUNCTION

“ON”

BUTTON

PRESET

(PS)

STATION

DISPLAY

CASSETTE

HOLDER

PRESET

SELECT

(A)

BUTTON

DISPLAY

ON/OFF

(B)

BUTTON

TIMER/SLEEP

PROGRAM

NO.

BUTTON

}

CLOCK

BUTTON

PRESET

BUTTON

EJECT

BUTTON

TAPE

TRANSPORTING

BUTTON

REWIND

(44

REW),

STOP

(ml

STOP),

FAST

FORWARD

(F.F

PP),

QUICKFINDER

REVERSE

(@)

QUICK

FINDER),

PLAY

(

PLAY),

QUICKFINDER

FORWARD

(QUICK

FINDER(@®D)),

RECORDING

(

REC),

COUNTER

“0”

STOP,

PAUSE

(

PAUSE)

Service

Manual

VS-2EGN

Fig.

4-2

Controls

(Rear

View)

TRACKING

CONTROL

COMPARTMENT

FOR

THE

OPTIONAL

REMOTE

CONTROL

UNIT

RC-V202

COLOR

SYSTEM

SELECTOR

FINE

TUNING

(D)

BUTTON

COUNTER

RESET

(C)

BUTTON

INPUT

SELECTOR

POWER

ON/OFF

SWITCH

CONVERTER

CHANNEL

(CH.)

ADJUSTMENT

(ADJ.)

HOLE

ANTENNA

(ANT.)

JACK

OUT

JACK

AUDIO

JACK

VIDEO

JACK

VIDEO

OUT

JACK

REMOTE

PAUSE

JACK

INLET

TV/VIDEO

BUTTON

(EA

MODEL

ONLY)

PRINCIPAL

PARTS

LOCATION

10.

TAs

12.

13.

14,

15,

16.

17.

18.

19.

20.

21.

22.

23.

24.

25.

OPERATION

P.C

BOARD

V1009A5170

FUNCTION

SWITCH

FUNCTION

OFF/TIMER

SWITCH

DIGITAL

DISPLAY

PRESET

SELECTOR

(A)

SWITCH

DISPLAY

ON/OFF

(B)

SWITCH

TIMER/SLEEP/PROGRAM

NO.

SWITCH

CLOCK

SWITCH

PRESET

SWITCH

EJECT

SWITCH

QUICK

FINDER

REVERSE

SWITCH

REWIND

SWITCH

PLAY

SWITCH

STOP

SWITCH

QUICK

FINDER

FORWARD

SWITCH

FAST

FORWARD

SWITCH

PAUSE

SWITCH

TRACKING

VOLUME

COUNTER

AUTO

“0”

STOP

SWITCH

REC

SWITCH

LED

P.C

BOARD

V1009D5320

SYSTEM

SWITCH

FINE

TUNING

(D)

SWITCH

COUNTER

RESET

(C)

SWITCH

BACK

BATTERY

(6)

O®2®O®

OOMQO®Q

OOGL

|©

Bea)

BIg

Fig.

5-1

Parts

Location

(Front

View)

Service

Manual

VS-2EGN

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