Sharp VC-90ET Manuale utente

VC-90ET

SHARP

SERVICE

MANUAL

VIDEO

CASSETTE

RECORDER

move.

VC-90ET

In

the

interests

of

user-safety

(Required

by

safety

regulations

in

some

countries)

the

set

should

be

restored

to

its

original

condition

and

only

parts

identical

to

those

specified

should

be

used.

CONTENTS

SPECIFICATIONS.

........csccssecsecssecsseccenececssesensasnsssscneceeensaneasesssseanesacasonscsssussssaeeesanseeen

seers

DISASSEMBLY

AND

REASSEMBLY...........ccssesscsscsecsscrececeeneesneeseeserseeseserscsvenseeseneeesenenaes

FUNCTION

OF

MAJOR

MECHANICAL

ADJUSTMENT,

REPLACEMENT

AND

ASSEMBLY

OF

MECHANICAL

UNITS

.0.......ccssescsssessssecscssencensseresenneceessnesessoeecscesoneseesnssesenseaseensnsen

ses

ADJUSTMENT

OF

ELECTRICAL

CIRCUITRY

........ecsccsscessetscesceseceessessessscsncneseseceeseeeersteesseseeeseseqaaseenecseesscersssenenocecensasenaerees

TROUBLESHOOTING

GUIDE

BLOCK

DIAGRAM

WAVE

FORMS

..........sccsccccecsereesssessesnseceeseeasensssennecenssnscenecesnsceeseosecensosessassesaaraeesssnenereenans

SCHEMATIC

DIAGRAMS

WIRING

SIDE

PWBS

...........ccecccsceressecsssseesscsecssecnsenesenaeseeceanenserssceasnsesersnecausansaaceesseenaee

REPLACEMENT

ELECTRICAL

PARTS

LIST

uu...

esccsecssscsessccncseercesecsersccceesssescsusesceecesaeereceesssssensaeecsseeresessseesagesnsrssessesasnne

EXPLODED

VIEWS.

......ccececcecsceesscccsssensssecesersssseesseesesnaaeaenersoneassssensnestocsretenssenersensneesssentes

PACKING

OF

THE

SET

PPPPTPSTITITTITirrrrrrrrrrrietee

rier

PPPTITTTISTTITITITTTT

TTT)

SS

SS SS

SS

eS

SHARP

CORPORATION

VC-90ET

Format:

Video

recording

system:

Video

signal:

Recording

playing

time:

Tape

width:

Tape

speed:

Antenna:

Receiving

channel:

RF

converter

output

signal:

Power

requirement:

Power

consumption:

Operating

temperture:

Storage

temperature:

Weight:

Dimensions:

VIDEO

Input:

Output:

AUDIO

Input:

Output:

Accessories

included:

Note:

SPECIFICATIONS

VHS

PAL,

SECAM

MESECAM,

NTSC

standard

Rotary,

slant

azimuth

two

head

helical

scan

system

PAL,

SECAM,

NTSC

colour

or

monochrome

(CCIR

System

B/G,

I,

D/K,

M)

signal

240

min

max.

with

SHARP

E-240

tape

(PAUMESECAM/SECAM

in

SP

mode)

8

hours

max.

with

SHARP

E-240

tape

(PAL/MESECAM/SECAM

in

LP

mode)

160

min

max.

with

SHARP

T-160

tape

(NTSC

in

SP

mode)

8

hours

max.

with

SHARP

T-

160

tape

(NTSC

in

EP

mode)

12.7mm

23.39

mm/sec.

(PAL

in

SP

mode)

33.35mm/msec.

(NTSC

in

SP

mode)

11.7

mm/sec.

(PALin

LP

mode)

16.68mm/msec.

(NTSC

in

LP

mode)

(PB

only)

11.12

mm/sec.

(NTSC

in

EP

mode)

75

ohm

unbalanced

VHF

E2~E

12,

(44.25MHz~295.25MHz)

UHF

E21~E69,

(471.25MHz~885.25MHz)

UHF

Channel

E30~E39

(adjustable).

Preset

to

Channel

E36

AC110~240V,

AUTO

50/60

Hz

Approx.

24W

(at

AC220V

50Hz)

5°C

to

40°C

-

20°C

to

55°C

5.5kg

430

mm

(W)

x

348

mm

(D)

x

89

mm

(H)

0.5~2.0

Vp-p,

75

ohm

1.0

Vp-p,

75

ohm

Line:

-

8

dB,

more

than

47k

ohm

(with

-

4dB/-

8dB

ATT.

SW

)

Line:

-

8

dB,

less

than

1k

ohm

Antenna

75

ohm

coaxial

connector

cable

(plug

provided)

Operation

Manual

SHUTTLE

remote

contro!

Dry

Battery

AV

Cable

As

part

of

our

policy

of

continuous

improvement,

we

reserve

the

right

to

alter

design

and

specifications

without

notice.

The

antenna

must

correspond

to

the

new

standard

DIN

45325

(IEC

169-2)

for

combined

UHF/VHF

antenna

with

75

ohm

connector.

w

wn

VC-S0ET

DISASSEMBLY

AND

REASSEMBLY

Remove

the

four

upper

cabinet

fastening

screws

Remove

the

eight

bottom

panel

fastening

screws

@.

Remove

the

one

front

panel

fastening

screw

©.

Release

the

three

clips

@

and

remove

the

front

panel.

Remove

the

HiFi

PWB

holder

©.

Remove

the

one

SYSCON

SERVO

PWB

Holder

fastening

screw

©.

Remove

the

one

SUB

CHROMA

PWE

Holder

fastening

screw

@.

8.

10.

11.

12.

13.

Remove

the

one

RF

Converter

Holder

fastening

screw

@).

.

Remove

the

two

antenna

terminal

cover

fastening

screws

@.

Remove

the

two

main

PWB

fastening

screws

@.

Remove

the

two

head

amp

PWB

fastening

screws

(1)

.

Remove

the

two

power

unit

fastening

screws

(2,

Remove

the

four

mechanism

chassis

fastening

screws

(13).

.

Release

the

timer

PWB

(9

fastening

clips.

.

Release

the

operation

PWB

(5

fastening

clips.

Full

erase

head

ass'y

Kis

Supply

pole

base

ass'y(2)

"

V¥C-90ET

FUNCTION

OF

MAJOR

MECHANICAL

PARTS

(TOP

VIEW)

Take-up

pole

base

ass’y

21)

Drum

ass'y

Tension

arm

assy

(3)

Brake

shifter

(4)

Back

tension

lever

(5)

Supply

reel

disk

(6)

Main

supply

brake

lever

&

Full

erase

head

ass’y

;

Erase

the

whole

records

on

the

tape

in

the

recording

mode.

Tension

arm

ass'y

Detects

the

tension

of

tape

while

running,

and

brakes

the

supply

reel

disk

via

the

tension

bane.

Brake

shifter

Set

the

position

of

brake

or

the

like

in

accordance

with

the

modes

such

as

stop

and

playback.

Back

tension

lever.

Back

tension

lever

Bakes

the

supply

reel

disk

to

a

certain

degree

to

prevent

tape

slackening

during

“loading”

and

“shifting

from

playback

to

video

search

rewind”.

Main

supply

brake

Brakes

the

supply

reel

disk

to

prevent

tape

slackening

when

the

unit

is

stopped

in

fast

forward

or

rewind

mode.

Main

take-up

brake

Brakes

the

take-up

reel

disk

to

prevent

tape

slackening

when

the

unit

is

stopped

in

fast

forward

or

rewind

mode.

Half-loading

level

Bring

the

tape

in

contact

with

the

A/C

head,

putting

it

in

half-loading

state

in

the

fast

forward

orrewind

mode.

Video

search

brake

lever

It

is

in

contact

with

the

take-up

reel disk

normally,

and

brakes

it

to

a

certain

degree.

It

applies

larger

brake

in

the

video

search

rewind

mode.

24)

V.H

Cleaner

arm

ass’y

20)

A/C

head

ass'y

(19)

Cam

switch

(25)

Solenoid

ass’y

(23)

Dew

sensor

fo]

2

(18)

Loading

motor

Nate,

A|_—(16)

Pinch

roller

lever

ass'y

°

ie

(5)

Relay

shifter

lever

9

eYay

a

=

;

(14)

Capstan

D.D.motor

©)

3

(13)

Reverse

guide

(12)

Take-up

reel

disk

Sal

(GO)

(11)

Video

search

brake

lever

S

fi

(10)

Half-loading

lever

(9)

Main

take-up

brake

lever

(8)

Idler

gear

ass‘y

Reverse

guide

Pulls

out

the

tape

in

the

video

search

rewind

mode,

and

controls

the

tape

drive

train

height

with

the

upper

and

lower

guides.

Relay

shifter

lever

Transmits

the

operation

of

the

master

cam

to

the

brake

shifter,

and

operates

the

reverse

guide.

Pinch

roller

lever

ass’y

Press-fits

the

tape

to

the

capstan

during

tape

running.

The

right

protrusion

switches

the

clutch

of

the

cassette

housing

control

assembly

in

“

tape

eject”,

and

makes

the

mechanism

eject

the

tape.

Master

cam

Turns

clockwise

during

loading,

and

counterclockwise

during

unloading,

and

moves

the

shifter

or

the

like

in

accordance

with each

mode.

Loading

motor

A

motive

power

which

drives

the

mechanism.

It

transmits

the

power

to

the

master

cam

and

cassette

housing

control

assembly

via

the

belt.

Cam

switch

Rotates

synchronously

with

the

master

cam,

and

detects

the

position

of

each

mode

by

means

of

the

internal

switch.

Dew

sensor

Detects

the

generation

of

dew

in

the

set.

It

stops

the

mechanical

action

of

the

set

when

finding

any

dew

in

the

set.

VC-SOET

FUNCTION

OF

MAJOR

MECHANICAL

PARTS

(BOTTOM

VIEW)

Relay

gear

drive

lever

Reel

sensor

(9)

Take-up

loading

gear

(10)

Supply

loading

gear

(8)

Auxiliary

fast

forward

brake

lever

Brake

solenoid

(5)

(6)

Reel

pulley

Slow

brake

Gets

in

contact

with

the

capstan

D.D.

motor

linking

to

the

master

cam

in

the

slow

still

mode,

and

brakes

it

to

a

certain

degree.

Capstan

D.D.

motor

A

motive

power

which

runs

the

tape.

It

transmits

the

power

via

the

reel

belt.

Reel

belt

Transmits

the

power

to

run

the

tape

to

the

reel

Brake

solenoid

Adsorbs

and

holds

the

brake

shifter

in

the

fast

forward

and

rewind

modes,

and

releases

it

in

the

Reel

pulley

Transmits

the

power

of

the

capstan

D.D.

motor

to

the

reel

disk

via

the

reel

idler.

Reel

sensor

An

element

which

sheds

the

light

onto

the

reflection

plate

affixed

to

the

bottom

side

of

the

reel

disk,

and

detects

the

rotation

of

the

reel

disk

through

receiving

the

reflected

light.

Auxiliary

fast

forward

brake

lever

Brakes

the

supply

reel

disk

to

a

certain

degree

in

the

fast

forward

and

rewind

modes.

Take-up

loading

gear

Shifts

the

take-up

pole

base

and

guide

roller

via

the

loading

relay

gear,

and

applies

the

tape

around

the

durm

assembly,

as

well

as

transmits

the

power

to

the

supply

loading

gear.

Supply

loading

gear

Shifts

the

supply

pole

base

and

guide

roller

via

the

take-up

loading

gear,

and

applies

the

tape

around

the

drum

assembly.

Relay

gear

drive

lever

Transmits

the

movement

of

the

master

cam

to

the

take-up

loading

gear

via

the

loading

relay

gear.

VC-90ET

ADJUSTMENT,

REPLACEMENT

AND

ASSEMBLY

OF

MECHANICAL

UNITS

Here

we

will

describe

a

relatively

simple

service

work

in

the

field,

not

referring

to

the

more

complicated

repairs

which

would

require

the

use

of

We

are

sure

that

the

easy-to-handle

tools

listed

below

would

be

more

than

handy

for

periodical

maintenance

to

keep

the

machine

in

its

original

special

equipment

and

tools

(drum

assembly

working

condition.

replacement,

for

example).

TOOLS

NECESSARY

FOR

ADJUSTING

THE

MECHANICAL

UNITS

The

following

tools

are

required

for

proper

service

and

satisfactory

repair.

Jig

Item

Reel Disk

Height

Adjustment

Jig

JiGRHO002

JiGMP0001

JiGACH-F18

JiGTGOO90

JiGTG1200

JiGTHOO06

JiGVHT-063

JiGSG2000

JiGHWO0009

JiGHWO0015

ac

VROATFPS

CA

Master

Plane

AIC

Head

Tilt

Adjustment

Jig

Torque

Gauge

(90g)

Torque

Gauge

(1.2

kg)

Gauge

Head

Cassette

Torque

Meter

Tension

Gauge

(300g)

Tension

Gauge

(2.0kg)

_

Hex

Wrench

(0.9mm)

Hex

Wrench

(1.2mm)

Hex

Wrench

(1.5mm)

B

fa

c

A

CZ

Alignment

Tape

(NTSC)

a

c

Alignment

Tape

(PAL)

Hi-Fi

Alignment

Tape

(PAL)

Alignment

Tape

(SECAM)

HiFi

Alignment

Tape

(NTSC)

Code

Rep

ht

Y

U

M

N

Ww

D

cB

Configuration

These

jigs

are

used

for

checking

and

adjusting

the

reel

disk

height

This

Jig

is

used

for

setting

the

A/C

head

tilt.

These

jigs

are

used

for

checking

and

adjusting

the

torque

of

take-up

and

supply

reel

disks.

This

cassette

torque

meter

is

used

for

checking

and

adjusting

the

torque

of

take-up

for

measuring

tape

back

tension.

There

are

two

Gauges

used

for

the

tension

measurements,

300

g

and

2.0

kg.

These

Jigs

are

used

for

loosening

or

tightening

special

hexagon

type

screws.

These

Tapes

are

especially

used

for

electrical

fine

adjustment.

f

VC-90ET

Jig

Item

Configuration

JiGDT-0001

a

Tension

Gauge

Adapter

JiGADP003

a

Special

Bladed

Screwdriver

jens

|

B

Tension

Band

and

Plate

;

Adjustment

Jig

JiGDRiVER-6

C

B

This

is

used

for

replacement

of

the

Drum

Replacing

Jig

VCR's

upper

drum.

This

Jig

is

used

with

the

tension

gauge.

Rotary

Transformer

Clearance

Adjusting

Jig.

This

Screwdriver

is

used

for

adjusting

the

guide

roller

height.

This

Jig

is

used

for

adjusting

the

tension

band

and

tension

plate.

This

is

used

to

screw

down

resin-

made

parts:

the

specified

torque

is

5kg.

B

A

Torque

Driver

(5kq)

JiGTD1200

JiGDRIVER1

10-7

15

|

Box

Driver

JiGDRIVER110-4

Al

Retaining

Guide

Height

JiGGH-F18

ai

Adjustment

Jig

jewore

Jw

|

NOTE:

Current

JiGMA0001

contains

Master

Plane

(JiGMP0001)

and

Disk

Height

Adjusting

Jig

(JiGRHO001).

Even

though

new

Disk

Height

Adjusting

Jig

GiGRH0002)

covers

greater

height,

this

new

Jig

(JiGRH0002)

can

be

used

for

current

JiGRH0001,

but

current

Jig

JiGRH0001)

cannot

be

used

as

JiGRH0002.

Master

Plane

(JiGMP0001)

can

be

used

with

JiGRH0001

and

JiGRH0002

as

well.

This

Jig

is

used

for

height

adjustment

of

the

AVC

head.

This

Jig

is

used

for

height

adjustment

of

the

retaining

guide

and

X-position.

This

Jig

is

used

for

height

adjustment

of

the

retaining

guide.

G

K

p

8

V

U

This

Jig

is

used

for

height

Retaining

Guide

Height

adjustment

of

the

reverse

guide.

Adjustment

Jig

VC-90ET

MECHANICAL

PARTS

REQUIRING

PERIODICAL

INSPECTION

Use

the

following

table

as

a

guide

to

maintain

the

mechanical

parts

in

good

operating

condition.

Maintained

500

|

1000

Guide

roller

ass‘y

Abnormal

rotation

or

significant

vibration

requires

replacement.

Clean

with pure

high

quality

isopropyl

alcohol.

Supply

impedance

roller

ateral

noises

Head

occasionally

blocked

Supply

impedance

roller

(inner)

Supply

impedance

roller

flange

Retaining

guide

Slant

pole

Clean

tape

contact

area

with

the

specified

cleaning

liquid.

Video

head

Poor

color,

beating

Sound

too

small

or

distorted

No

tape

running,

uneven

color

No

tape

running,

tape

slack

No

tape

running,

tape

slack,

no

fast

forward/rewind

Full-erase

head

Clean

tape

contact

area

with

the

specified

cleaning

liquid.

A/C

head

Capstan

D.D.

Motor

fem

|

za

Poor

S/N

ratio,

no

El

eee

Pinch

roller

ar

ea

Clean

rubber

and

rubber

contact

area

with

the

specified

cleaning

liquid.

Reel

belt

Cassette

not

loaded

or

unloaded

.

Loading

belt/Cassette

loading

belt

Tension

band

ass'y

Cassette

not

loaded

or

unloaded

Loading

motor

Replace

the

roller

o

the

cleaner

when

it

wears

down.

Just

change

the

video

head

cleaner

arm

assembly

AHC

(Automatic

Head

Cleaner)

for

new

one.

ial

below

ae

le

[04

|

Reel

block*

*See

the

table

below

for

servicing

the

reel

block

parts.

Supply/Take-up

reel

disks

i

No

tape

running,

ean

with

pure

hig

;

tape

Sack

°

auallty

isopt

opyl

Main

supply/take-up

brake

levers

Tape

slack

Video

search

brake

lever

Idler

gear

ass'y

No

tape

running

Reel

Pulley

Saas

NOTE:

O:

Partreplacement.

O:

Cleaning

(For

cleaning,

use

a

lint-free

cloth

dampened

with

pure

isopropyl!

alcohol).

A:

Oilrefilling

(The

indicated

point

should

be

lubricated

with

high

quality

spindle

oil

every

1000

hrs).

This

model

has

no

adjusting

parts

for

torques,

tensions,

etc.

If

the

reading

is

outside

the

specified

range,

cleanor

replace

the

part.

REMOVAL

AND

REASSEMBLY

OF

CASSETTE

HOUSING

CONTROL

ASSEMBLY

e

1.

2.

3.

Supply

reel

disk

2.

Removal

Set

the

cassette

ejected

condition

in

the

cassette

eject

mode.

Unplug

the

recorder

from

the

main

source.

Follow

the

procedures

below

in

the

specified

order.

a)

Remove

the

cassette

loading

belt

©.

b)

Disconnect

the

FFC

(Full

Flat

Cable)

@.

©)

Remove

the

cassette

housing

installation

screws

@).

d)

Slide

and

pull

out

the

cassette

housing

control

assembly

upward

@.

Cassette

housing

installation

screw

ue

(Full

Flat

Cable)

ou

belt

When

the

belt

is

detached,

tuck

it

as

in

the

figure

so

that

it is

kept

free

from

grease.

the tab

in

to

the

hole.

Cassette

housing

(1)

Cassette

loading

When

reassembling,

insert

VC-SOET

5.

Place

the

unit

in

the

eject

mode

in

removal

or

reassembly

of

the

cassette

housing

control

assembly.

6.

Load

the

cassette

once

onto

the

cassette

housing

control

assembly

after

reassembly.

(If

the

cassette

housing

control

assembly

normally

operates

after

this,

the

phases

of

mechanism

and

the

cassette

controller

are

accurately

adjusted

after

ejection.)

MECHANICAL

OPERATION

CHECK

WITHOUT

CASSETTE

When

power

is

on,

the

general

operations

of

the

mechanism

can

be

checked

without

a

cassette.

Note

the

following

points.

1.

Check

video

search

rewind

and

rewind,

rotating

the

take-up

reel

disk

@

by

hand

(in

either

normal

or

reverse

direction).

If

it

is

not

rotated,

the

reel

sensor

works

to

shift

the

mechanism

to

the

eject

mode.

2.

When

the

stop

button

is

pressed,

the

mechanism

does

not

stop

at

a

normal

stop

position.

It

shifts

to

the

eject

mode

and

stops.

3.

When

the

stop

button

is

pressed

in

the

playback,

video

search

rewind,

and

video

search

forward

modes,

the

supply

reel

disk

©

keeps

on

rotating

for

several

seconds

for

elimination

of

tape

slack

in

the

course

of

shifting

to

the

eject

mode.

In

such

a

case,

rotate

the

take-up

reel

disk

©

somewhat

by

hand,

and

the

supply

reel disk

©

stops,

which

can

reduce

the

working

time.

REPLACEMENT

OF

WORM

WHEEL

ASSEMBLY

Figure

1-1.

frame

(L)

Reassembly

.

Before

installation

of

the

cassette

housing

control

assembly,

place

the

unit

in

the

stop

mode

with

the

power

on,

then

unplug

the

power

cord.

(The

main

body

is

placed

in

the

eject

mode.)

oe

the

procedures

for

removal

in

the

reverse

order.

Notes:

1.

2.

3.

Be

sure

to

unplug

the

power

cord

in

removal

and

reassembly.

Keep

the

cassette

loading

belt

free

from

grease.

In

case

of

its

adhesion,

clean

the

belt.

In

using

a

magnet

screw

driver,

be

sure

to

keep

it

away

from

the

A/C

head,

FE

(Full

Erase)

head,

or

the

drum.

-

In

removal

and

reassembly,

take

care

not

to

hit

the

cassette

housing

control

assembly

or

tools

against

the

guide

pin,

drum,

or

the

like

thereabout.

Start

sensor

PWB

Cassette

switch

connector

Worm

bracket

B

tight

screw

Phase

‘Worm

wheel

ass'y

Cassette

housing

frame

(R)

gear

Figure

1-2.

VC-90ET

®

Removal

1.

Unsolder

the

cassette

switch

connectors

from

the

start

sensor

PWB.

ui

Start

sensor

PWB

Start

sensor

PWB

|

fixing

hook

Cassete

switch

[-

Soldering

connector

Figure

1-3.

2.

Lift

the

start

sensor

PWB

pressing

the

two

start

sensor

PWB

fixing

hooks

inward.

—_>

\

Lift

hanes

sensor

PWB

Start

sensor

PWB

fixing

hook

Figure

1-4.

3.

Unscrew

one

B

tight

screw

to

detach

the

worm

bracket.

Note:

The

worm

shaft

bearing

can

easily

come

out

of

position.

So

be

careful

not

to

lose

it.

Worm

shaft

bearing

Worm

bracket

worm

wheel

assy

Figure

1-5.

4.

Remove

the

worm

shaft

assembly,

pulley,

and

cassette

loading

belt

all

from

the

cassette

housing

frame

(R).

Cassette

loading

belt

ie

Pulley

Cassette

housing

frame

(R)

%@

Phase

gear

Worm

wheel

ass'y

Figure

1-6.

10

Tally

mark

5.

Place

the

slider

just

above

the

worm

wheel

assembly

(Figure

1-7).

(The

retainer

of

the

slider

is

locked

at

two

positions

hen.

So

unlock

it

as

in

the

Figure

1-8.)

6.

Pull

out

the

worm

wheel

assembly

toward

you

pressing

the

switch

lever

upward.

(Figure

1-7)

Slider

|

is

lever

Worm

wheel

ass‘y

2)

I"

\—Phase

gear

!

Qo

Cut

washer

Figure

1-7.

Retainer

opening

{Also

provided

on

the

(L)}

side

of

cassette

housing

frame)

Cassette

housing

frame

{R)

Slider

Retainer

@

Press.

Cassette

housing

frame

(R)

{L)

side

Figure

1-8.

Reassembly

.

Turn

the

phase

gear

clockwise

until

the

slider

comes

to

a

halt

in

the

cassette

insertion

direction.

(See

the

Figure

1-9.)

.

Insert

the

set

up

worm

wheel

gear

assembly

into

the

cassette

housing

frame

(R),

matching

the

mark

on

the

phase

gear

with

the

mark

on

the

worm

wheel

gear.

Detach

the

cut

washer

on

the

phase

gear

assembly

and

the

phase

gear

for

easier

installation

of

worm

wheel

assembly.

Note:

Make

sure

that

the

slider

is

in

the

groove

of

the

drive

gear

arm.

Sharp VC-90ET Manuale utente

Manuali Sistema VCR popolari di altre marche