Sharp VC-780E Manuel utilisateur

VC-790ET

SHARP

SERVICE

MANUAL

S29X6VC-780E/

VIDEO

CASSETTE

RECORDER

VC-780E

moves

VC-790ET

the

interests

user-safety

(Required

safety

regulations

some

countries)

the

set

should

restored

its

original

condition

and

only

parts

identical

those

specified

should

used.

CONTENTS

SPECIFICATIONS

DISASSEMBLY

AND

REASSEMBLY

LOCATION

MECHANICAL

PARTS

ADJUSTMENT,

REPLACEMENT,

ASSEMBLING

AND

TOOLS

NECESSARY

FOR

MECHANICAL

ADJUSTMENT

ELECTRICAL

CIRCUITRY

TROUBLESHOOTING

GUIDE

OTHER

TROUBLESHOOTING

GUIDE

WAVE

FORMS

OVERALL

SEHEMATIC

DIAGRAM

SCHEMATIC

DIAGRAMS

WIRING

SIDE

PWBs

REPLACEMENT

PARTS

LIST

EXPLODE

VIEWS

PACKING

THE

SET

femmes

ees,

Aes

oie

wage

faery

SHARP

CORPORATION

VC-790ET

Format:

Video

recording

system:

Video

signal:

PAL:

SECAM:

NTSC:

Recording

playing

time:

Tape

width:

Tape

speed:

Antenna:

-Receiving

channel:

converter

output

signal:

Power

requirement:

Power

consumption:

Operating

temperture:

Storage

temperature:

Weight:

Dimensions:

VIDEO

Input:

Output:

AUDIO

Input:

Output:

AUDIO

Input:

Output:

Accessories

included:

Note:

SPECIFICATIONS

VHS

standard

Rotary

two-head

helical

scan

system

with

slant

double-azimuth

combination

video

head.

PAL

System-B/G

(

P.B/REC)

PAL

System-|

(P.B/REC)

PAL

System-D

(P.B/REC)

MESECAM

System

(P.B/REC)

SECAM

System-B/G

(

P.B/REC

)

SECAM

System-D/K

(

P.B/REC

)

NTSC

4.43

(

P.B/REC)

NTSC

3.58

(

P.B/REC)

240

min

max.with

SHARP

E-240

tape

(PAL/MESECAM/SECAM

mode)

hours

max.

with

SHARP

E-240

tape

(PAL/MESECAM/SECAM

mode)

160

min

max.with

SHARP

T-160

tape

(NTSC

mode)

320

min

max.with

SHARP

T-160

tape

(NTSC

mode)

hours

max.

with

SHARP

T-160

tape

(NTSC

mode)

12.7

23.39

mmisec.

(PALin

mode)

33.35mm/msec.

(NTSC

mode)

11.7mmisec.

(PALinLP

mode)

16.68mmi/sec.

(NTSC

made)

11.12

mm/sec.

(NTSC

made)

ohm

unbalanced

VHF

E2~

E12,

(44.25MHz

~294.25MHz)

UHF

E21~

E69,

(471.25MHz

~885.25MHz)

UHF

Channel!

E30

£39

(adjustable).

Preset

Channel

E36

UHF

Channel

US26~US38(adjustable).

Preset

Channe!

US34

UHF

Channel

J25~J37

(adjustable).

Preset

Channel

J33

100~240V,

AUTO

50/60

Approx.

23W

(at

220V

50Hz)

5°C

40°C

20°C

55°C

5.8kg

430

(W)

350

(D)

89mm

(H)

1.0

Vp-p,

ohm

1.0

Vp-p,

ohm

OdB

0.775

Vrms

Line: -8dB,

than

50k

ohm

RCA

terminal

Line:

dB,

less

than

ohm

0d8

0.775

Vrms

Line:

3.8

dB,

than

50k

ohm

terminal

Line:

3.8

dB,

less

than

ohm

Antenna

ohm

coaxial

connector

cable

(plug

provided)

Operation

Manual

infrared

Remote

contro!

part

our

policy

continuous

improvement,

reserve

the

right

alter

design

and

specifications

without

notice.

The

antenna

must

correspond

the

new

standard

DIN

45325

(IEC

169

for

combined

UHF/VHF

antenna

with

ohm

connector.

nnn

Soe

DISASSEMBLY

AND

REASSEMBLY

Remove

the

four

upper

cabinet

fastening

screws

q).

Remove

the

six

bottom

pane!

fastening

screws

@).

Remove

the

one

front

panel

fastening

screw

(3).

Release

the

three

clips

(4)

and

remove

the

front

panel.

Remove

the

two

antenna

terminal

cover

fastening

screws

the

tow

push

rivets

which

fasten

the

syscon

servo

unit

and

the

angle.

Remove

the

four

syscon

servo

unit

fastening

screws

(7)

Remove

the

Y/C

PWB

holder

@).

Remove

the

two

main

PWB

fastening

screws

(9)

‘

Remove

the

two

head

amp

PWB

fastening

screws

;

Remove

the

three

power

unit

fastening

screws

Remove

the

four

machanism

chassis

fastening

screws

Release

the

timer

PWB

43)

fastening

clips.

Release

the

operation

PWB

fastening

clips.

Vi-

#00)

VC-790ET

LOCATION.

LIST

MECHANICAL

PARTS

A/C

head

arm

Half-loading

lever

spring

inch

roller

lever

ass’y

elay

shifter

lever

etaining

guide

Capstan

0.D.motor

Main

take-up

brake

lever

eee

ee:

Cassette

LED

Reverse

guide

spring

nghrl

sere

bee

aeetcitl

Idler

gear

ass

Take-up

reel

disk

Reverse

guide

|Video

brake

lever

|Take-up

pole

base

slider

Tension

spring

hook

plate

—

Half-loading

lever

Reel

pulley

Reel

sensor

PWB

Brake

solenoid

Shifter

spring

Shifter

spring

cover

Connector

Tension

band

ass’y

Auxiliary

fast

forward

brake

lever

Reverse

guide

spring

Reel

belt

relay

gear

WwW

Supply

pole

base

ass’y

;

Slow

brake

fever

X-position

adjusting

nut

Half-loading

reciprocating

spring

Half-loading

reciprocating

lever

Slow

brake

spring

ive)

Relay

gear

drive

lever

Take-up

gear

Take-up

armass'y

—.

Drum

D.D.

motorass'y

Supply

gear

Supply

arm

ass‘y

reciprocating

spring

Supply

pole

base

slider

Reel

block

chassis

wal

Auxiliary

fast

forward

brake

spring

Full

flat

cable

holder

ull

flat

cable(

Drum

D.D.

motor)

tat

eed

“wan

Half-loading

drive

lever

—-

}jLoading

block

ass’y

Reel

sensor

motor

ain

brake

spring

Master

cam

sensor

sls

”

TOP

VIEW

™A®HO@OOMOMOPOOC

®@

BOTTOM

VIEW

[6—6MO®

O©®@

@™O®™

LOCATION

MECHANICAL

PARTS

C5)

@6) G7) 28)

@2)

SOS!)

G2)

65)

bod

ats

(‘S

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TAWA,

daa

porn

‘

alan

69)

60)

6!)

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Vo-/#0U

2-18)

VC-790ET

ADJUSTMENT,

REPLACEMENT,

ASSEMBLY

AND

CLEANING

MECHANICAL

UNITS

Here

will

describe

relatively

simple

service

work

are

sure

that

the

easy-to-handle

tools

listed

the

field,

not

referring

the

complicated

below

would

than

handy

for

periodical

repairs

which

would

require

the

use

special

maintenance

keep

the

machine

in,.its,original

equipment

and

tools

(drum

assembly

re-

efficient

condition.

placement,

for

example).

TOOLS

NECESSARY

FOR

ADJUSTING

THE

MECHANICAL

UNITS

The

following

tools

are

required

for

proper

service

and

satisfactory

repair.

[na[

item

ranno.

fou]

configuration

Reel

Disk

Height

AdjustingJig.”

Ss:

SiGRHOOO2

JiGACH-F18

Torque

Gauge

(90g)

JiGTGOOSO

Torque

Gauge

(1.2

kg)

JiGTG1200

Gauge

Head

Cassette

Torque

Meter

[we

Hex

Wrench

(1.5

VROCPSV

These

Jigs

are

used

for

checking

and

adjusting

the

reel

disk

height.

This

Jig

used

for

settimg

the

A/C

ASC

Head

Tilt

Adjusting

Jig

eine

ead

tilt.

—

These

Jigs

are

used

for

checking

and

adjusting

the

torque

take-up

and

supply

reel

disks.

This

cassette

torque

meteriis

Used

for

checking

and

adjusting

the

torque

take-up

and

supply

reel

and

for

measuring

tape

back

tension.

There

are

two

Gauges

used

for

the

tension

méasurements,

300

and

2.0

kg.

These

Jigs

are

used

for

loosening

tightening

special

Hexagon

type

screws.

This

tape

especially

used

for

electrical

fine

adjustment.

Alignment

Tape

(PAL}

This

used

for

replacement

the

VCR's

upper

drum.

Drum

Replacing

Jig

JiGDT-0001

This

Jig

used

for

the

tension

gauge.

Rotary

Transtormer

Clearance

Adjusting

Jig.

JiGADP003

Tension

Gauge

Adapter

¥,

VC-790ET

JIGDRIVER-6

Torque

Driver

JiGTD1200

JIGDRIVER1

10-7

This

Screwdriver

used

for

adjusting

the

guide

roller

height

and

X-position.

Special

Bladed

Screwdriver

JiGDRIVERH-4

This

Jig

used

for

adjusting

the

tension

band

and

tension

plate.

Tension

Band

and

Plate

Adjusting

Jig

This

used

screw

down

resin-

made

parts:

the

specified

torque

kg.

This

Jig

used

for

height

adjustment

the

A/C

head.

Box

Driver

This

Jig

used

for

height

adjustment

the

retaining

guide.

JiGDRIVER1

10-4

”

JiGRVGH-F1i8

Current

JiGMA0001

contains

Master

Plane

(JiGMP0001)

and

Disk

Height

Adjusting

Jig

ViGRHO001).

Even

though

new

Disk

Height

Adjusting

Jig

UiGRHO002)

covers

greater

height,

This

Jig

used

for

height

Retaining

Guide

Height

Adjusting

Jig

sdjustient

the

retaining

guide

This

Jig

used

for

height

adjustment

the

reverse

guide.

Reverse

Guide

Height

Adjusting

Jig

this

new

Jig

JiGRHO002)

can

used

for

current

JiGRHO001,

but

current

Jig

(JiGRHO001)

cannot

used

JiGHROO02.Master

Plane

(JiGMPO001)can

used

with

JiGRHO001

and

JiGRHOOO2

well.

Vier

FOUL

VC-790EF

MECHANICAL

PARTS

REQUIRING

PERIODICAL

INSPECTION

Use

the

following

table‘as

guide

maintain

the

mechanical

parts

in-good

operating

condition.

Remarks

Abnormal

rotation

significant

vibration

requires

replacement.

Clean

with pure

high

quality

—-

isopropy!

alcohol.

conan

tetetete

ROS

Clean

tape

contact

area

with

the

specified

cleaning

liquid.

Clean

tape

contact

area

with

the

specified

cleaning

liquid.

Clean

rubber

and

rubber

contact

area

with

the

specified

cleaning

NOTE:

©:

Part

replacement.

OC):

Cleaning

(For

cleaning,

use

lint-free

cloth

dampened

with

pure

isopropyl

alcohol).

Oil

refilling

(The

indicated

point

should

lubricated

with

high

quality

spindle

oil

every

1000

hrs).

This

model

has

adjusting

parts

for

torques,

tension,

etc.

the

reading

outside

the

specified

range,

clean

replace

the

part.

REMOVAL

AND

REASSEMBLY

CASSETTE

HOUSING

CONTROL

ASSEMBLY

Notes:

During

removal

and

reassembly,

careful

not

strike

the

nearby

guide

pin,

drum,

etc.

Before

removal

reassembly,

sure

unplug

the

recorder

from

the

outlet.

When

removing

and

attaching

the

cassette

belt,

careful

keep

free

from

grease.

Removal

Put

the

unit

the

cassette

eject

position.

Remove

the

cassette

belt

©.

Disconnect

the

FFC

(Full

Flat

Cable)

the

right

side

the

cassette

housing

control

assembly.

Note:

careful!

not

break

the

FFC.

Remove

the

two

cassette

housing

installation

screws.

Move

the

cassette

housing

control

assembly

(Fig.

1-1)

the

direction

arrow

®,

and

pull

out

straight

upward.

wn—

e®

Reassembly

Insert

the

tabs

the

cassette

housing

contro!

assembly

into

the

mechanism

chassis,

move

the

direction

arrow

and

secure

tem-

porarily.

Check

see

the

cassette

housing

control

assembly

the

correct

position,

and

then

tighten

the

two

screws

(XHPS330PO06WSO)

Attach

the

cassette

belt

©.

Connect

the

FFC

the

right

side

the

cassette

housing

control

assembly.

Cassette

belt

FFC

ball

—

bed

For

—

HELE

Insert

the

tabs

the

cassette

housing

into

the

GL,

mechanism

chassis.

Figure

1-1.

(Full

flat

cable}

V¥U-

760

VC-790ET

REPLACEMENT

WORM

WHEEL

ASSEMBLY

Removal

(Fig.

Unsolder

the

cassette

switch

connector

from

the

start

sensor

PWB

Release

the

two

catches

@on

the

cassette

housing

frame

(R),

and

remove

the

PWB.

Unscrew

one

tight

screw

detach

the

worm

bracket

Note:

The

bearing

can

come

off

position

too.

careful

not

let

the

bearing

fall.

Remove

the

worm

shaft

assembly

©,

pulley

and

cassette

belt

all

from

the

cassette

housing

frame

(R).

Finally

pull

the

worm

wheel

assembly

out

the

boss

the

cassette

housing

frame

(R).

Reassembly

(Fig.

1-2)

Turn

the

phase

gear

clockwise

until

the

slider

comes

halt

the

cassette

insertion

direction.

Set

the

worm

wheel

gear

assembly

onto

the

boss

the

cassette

housing

frame

(R),

matching

the

mark

the

phase

gear

with

the

mark

the

worm

wheel

gear.

Note:

Make

sure

that

the

slider

the

groove

the

drive

gear

arm.

Install!

the

pulley

and

apply

the

cassette

belt

both

the

worm

shaft

assembly

©.

Couple

the

clutch

the

clutch

lever

©.

And

mount

them

together

the

cassette

housing

frame

(R)

Attach

the

worm

bracket

the

worm

shaft

assembly

Place

them

onto

the

boss

on the

cassette

housing

frame

(R).

Tighten

one

tight

screw

Note:

Make

sure

that

the

parts

and

the

cassette

housing

frame

(R)

are

properly

engaged

with

the

parts

and

the

worm

bracket

Hook

the

start

sensor

PWB®@

the

two

positions

the

cassette

housing

frame

(R).

Note:

Check

that

the

switch

connector

right

the

cassette

switch

mounting

hole

©.

Finally

resolder

the

cassette

switch

connector

the

start

sensor

PWB.

Notes:

not

overtighten

the

tight

screw

(no

than

5.0+0.5

kg.

cm),

because

otherwise

the

lower

threads

the

screw

hole

the

resin-

made

boss

may

broken.

Keep

mind

that

the

clutch

switching

lever

should

the

correct

positional

relation.

The

mechanism

might

malfunction

even

the

lever

‘comes

slightly

out

position.

Vie

VC-790ET

Figure

1-2

{a).

Cassette

housing

frame

(R)

“

Sie

Connector

Pulley

‘Le

sigs

“DY

Sarg

“RAY

nae

;

Clutch

“i

Worm

shaft

ass‘y

(8)

Cassette

eee

mounting

hole

Mes

(1)

Start

sensor

PWB

©)

Drive

gear

arm

;

groove

Bearing

ot,

(3)

Worm

bracket

(2)

tight

screw

{LX-HZ3046GEFD)

Worm

wheel

gear

Phase

gear

Figure

1-2

(b).

Reassembly

drive

gear

(Fig.1-

Pass

the

tip

the

drive

gear

spring

(R}

through

the

square

hole

the

drive

gear

(R)

the

hook

the

spring

position.

Hook

one

end

the

reciprocating

spring

the

catch

the

drive

gear

(R)

Hook

the

other

end

the

reciprocating

spring

the

catch

the

worm

wheel

Fit

the

drive

gear

(R)

the

worm

wheel

that

the

catch

and

boss

the

drive

gear

(R)

are

exactly

the

square

hole

and

round

hole

Respectively,

the

worm

wheel.

(1)

Drive

gear

{R}

Drive

gear

spring

(R)

REPLACEMENT

CASSETTE

BELT

Replacement

(Fig.

1-4)

Remove

the

start

sensor

PWB

and

worm

bracket

from

the

cassette

housing

frame

(R).

Remove

the

worm

shaft

assembly,

pulley

and

cassette

belt

from

the

cassette

housing

frame

(R).

Replace

the

cassette

belt

with

new

one.

Notes:

not

overtighten

the

tight

screw

which

holds

the

worm

bracket

position.

The

specified

tightening

torque

5.0

0.5kg.

cm.

Make

sure

that

the

cassette

belt,

being

applied

the

cassette

housing

frame

(R),

free

from

grease.

stained

with

grease,

clean

the

belt

with

the

specific

cleaning

liquid.

Finally

check

the

clutch

switching

lever

for

its

specified

points.

Cassette

belt

Worm

shaft

ass‘y

Figure

1-4.

Ce manuel convient aux modèles suivants

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