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VC-790ET

SHARP

SERVICE

MANUAL

|

S29X6VC-780E/

|

VIDEO

CASSETTE

RECORDER

VC-780E

moves

VC-790ET

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

DISASSEMBLY

AND

REASSEMBLY

LOCATION

OF

MECHANICAL

PARTS

ADJUSTMENT,

REPLACEMENT,

ASSEMBLING

AND

|

TOOLS

NECESSARY

FOR

MECHANICAL

ADJUSTMENT

ADJUSTMENT

OF

ELECTRICAL

CIRCUITRY

TROUBLESHOOTING

GUIDE

OTHER

TROUBLESHOOTING

GUIDE

WAVE

FORMS

OVERALL

SEHEMATIC

DIAGRAM

SCHEMATIC

DIAGRAMS

WIRING

SIDE

PWBs

REPLACEMENT

PARTS

LIST

EXPLODE

VIEWS

PACKING

OF

THE

SET

femmes

ge

ees,

Aes

oie

a

wage

faery

SHARP

CORPORATION

a

=

in

VC-790ET

Format:

Video

recording

system:

Video

signal:

PAL:

PAL:

PAL:

SECAM:

SECAM:

SECAM:

NTSC:

.

NTSC:

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:

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

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)

320

min

max.with

SHARP

T-160

tape

(NTSC

in

LP

mode)

8

hours

max.

with

SHARP

T-160

tape

(NTSC

in

EP

mode)

12.7

mm

23.39

mmisec.

(PALin

SP

mode)

33.35mm/msec.

(NTSC

in

SP

mode)

11.7mmisec.

(PALinLP

mode)

16.68mmi/sec.

(NTSC

in

LP

made)

11.12

mm/sec.

(NTSC

in

EP

made)

75

ohm

unbalanced

VHF

E2~

E12,

(44.25MHz

~294.25MHz)

UHF

E21~

E69,

(471.25MHz

~885.25MHz)

UHF

Channel!

E30

~

£39

(adjustable).

Preset

to

Channel

E36

UHF

Channel

US26~US38(adjustable).

Preset

to

Channe!

US34

UHF

Channel

J25~J37

(adjustable).

Preset

to

Channel

J33

AC

100~240V,

AUTO

50/60

Hz

Approx.

23W

(at

AC

220V

50Hz)

5°C

to

40°C

-

20°C

to

55°C

5.8kg

430

mm

(W)

x

350

mm

(D)

x

89mm

(H)

1.0

Vp-p,

75

ohm

1.0

Vp-p,

75

ohm

OdB

=

0.775

Vrms

Line: -8dB,

more

than

50k

ohm

at

RCA

terminal

Line:

-

5

dB,

less

than

1k

ohm

0d8

=

0.775

Vrms

Line:

-

3.8

dB,

more

than

50k

ohm

\

at

Pin

21

terminal

Line:

-

3.8

dB,

less

than

1k

ohm

Antenna

75

ohm

coaxial

connector

cable

(plug

provided)

Operation

Manual

infrared

Remote

contro!

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.

a

ye

ee

rs

nnn

a

Soe

PS

Po

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

on

the

tow

push

rivets

which

fasten

the

syscon

servo

unit

and

the

angle.

Remove

the

four

syscon

servo

unit

fastening

screws

(7)

F

Remove

the

Y/C

PWB

holder

@).

9,

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

a

LOCATION.

LIST

OF

MECHANICAL

PARTS

|

A/C

head

arm

-

os

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

7

Idler

gear

ass

y

Take-up

reel

disk

.

Reverse

guide

|Video

search

brake

lever

7

|Take-up

pole

base

slider

Tension

spring

hook

plate

-

.

—

LL

Half-loading

lever

Reel

pulley

Reel

sensor

PWB

Brake

solenoid

Shifter

spring

Shifter

spring

cover

.

ut

Connector

Tension

band

ass’y

17

|

Auxiliary

fast

forward

brake

lever

Reverse

guide

spring

Reel

belt

Loading

relay

gear

>

an

:

WwW

Supply

pole

base

ass’y

;

5

wi

nn

Slow

brake

fever

ee

X-position

adjusting

nut

Half-loading

reciprocating

spring

Half-loading

reciprocating

lever

Slow

brake

spring

ive)

Relay

gear

drive

lever

~

Take-up

loading

gear

NS

Take-up

loading

armass'y

—.

Drum

D.D.

motorass'y

__

Supply

loading

gear

:

Supply

loading

arm

ass‘y

|

Loading

reciprocating

spring

Supply

pole

base

slider

oS

67

|

Reel

block

chassis

wal

uw

~

Auxiliary

fast

forward

brake

spring

Full

flat

cable

holder

ull

flat

cable(

Drum

D.D.

motor)

tat

mw

Wi

wi

Ww

as

mT

NO

eed

Ww

“wan

>

0

3.

|

Half-loading

drive

lever

AJ

—-

4

}jLoading

block

ass’y

Reel

sensor

on

Loading

motor

ain

brake

spring

Master

cam

ew

sensor

=

w

|

w

sls

BE

fj

Ww

Oo

>

oy

ea

a

”

e@

TOP

VIEW

™A®HO@OOMOMOPOOC

®@

BOTTOM

VIEW

[6—6MO®

O©®@

OF

@™O®™

EO

LOCATION

OF

MECHANICAL

PARTS

C5)

@6) G7) 28)

@2)

SOS!)

G2)

G3

3

65)

\

bod

a

ats

(‘S

\_\

7)

fe

TAWA,

daa

TT

oe

ou

7

°

porn

AE

‘

SE

ie

ry

ma

:

|

A

alan

il

a:

69)

GO

60)

6!)

HQ0OOOM

|—6

OO

@@OOCO@O@OOAMO®D

®

@®@@@O®

@

Vo-/#0U

Ad

Oe

2-18)

=a

I

|

VC-790ET

ADJUSTMENT,

REPLACEMENT,

ASSEMBLY

AND

CLEANING

OF

MECHANICAL

UNITS

Here

we

will

describe

a

relatively

simple

service

work

We

are

sure

that

the

easy-to-handle

tools

listed

in

the

field,

not

referring

to

the

more

complicated

below

would

be

more

than

handy

for

periodical

repairs

which

would

require

the

use

of

special

maintenance

to

keep

the

machine

in,.its,original

equipment

and

tools

(drum

assembly

or

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:

Ss

SiGRHOOO2

?

JiGACH-F18

Torque

Gauge

(90g)

JiGTGOOSO

Torque

Gauge

(1.2

kg)

JiGTG1200

5

Gauge

Head

Cassette

Torque

Meter

ne

[we

wm

[|

SA

ae

Hex

Wrench

(1.5

a

VROCPSV

These

Jigs

are

used

for

checking

and

adjusting

the

reel

disk

height.

This

Jig

is

used

for

settimg

the

A/C

ASC

Head

Tilt

Adjusting

Jig

eine

ead

tilt.

—

These

Jigs

are

used

for

checking

and

adjusting

the

torque

of

take-up

and

supply

reel

disks.

This

cassette

torque

meteriis

Used

for

checking

and

adjusting

the

torque

of

take-up

and

supply

reel

and

for

measuring

tape

back

tension.

There

are

two

Gauges

used

for

the

tension

méasurements,

300

g

and

2.0

kg.

6

7

These

Jigs

are

used

for

loosening

or

tightening

special

Hexagon

type

screws.

This

tape

ts

especially

used

for

electrical

fine

adjustment.

Alignment

Tape

(PAL}

This

is

used

for

replacement

of

the

VCR's

upper

drum.

Drum

Replacing

Jig

JiGDT-0001

This

Jig

is

used

for

the

tension

gauge.

Rotary

Transtormer

Clearance

Adjusting

Jig.

JiGADP003

BK

GN

SB

Tension

Gauge

Adapter

¥,

VC-790ET

2]

aw

|

JIGDRIVER-6

a

Torque

Driver

JiGTD1200

JIGDRIVER1

10-7

This

Screwdriver

is

used

for

adjusting

the

guide

roller

height

and

X-position.

Special

Bladed

Screwdriver

JiGDRIVERH-4

This

Jig

is

used

for

adjusting

the

tension

band

and

tension

plate.

Tension

Band

and

Plate

Adjusting

Jig

This

is

used

to

screw

down

resin-

made

parts:

the

specified

torque

is

5

kg.

This

Jig

is

used

for

height

adjustment

of

the

A/C

head.

Box

Driver

This

Jig

is

used

for

height

adjustment

of

the

retaining

guide.

JiGDRIVER1

10-4

”

a

JiGRVGH-F1i8

=|

BU

ar

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

is

used

for

height

Retaining

Guide

Height

Adjusting

Jig

sdjustient

Gt

the

retaining

guide

This

Jig

is

used

for

height

adjustment

of

the

reverse

guide.

Reverse

Guide

Height

Adjusting

Jig

this

new

Jig

JiGRHO002)

can

be

used

for

current

JiGRHO001,

but

current

Jig

(JiGRHO001)

cannot

be

used

as

JiGHROO02.Master

Plane

(JiGMPO001)can

be

used

with

JiGRHO001

and

JiGRHOOO2

as

well.

Vier

FOUL

VC-790EF

:

MECHANICAL

PARTS

REQUIRING

PERIODICAL

INSPECTION

~

Use

the

following

table‘as

a

guide

to

maintain

the

mechanical

parts

in-good

operating

condition.

ee

=

nt

Remarks

Abnormal

rotation

or

significant

vibration

requires

replacement.

-.

Clean

with pure

high

quality

—-

~-

isopropy!

alcohol.

conan

tetetete

Cc

i

ee

ROS

Ee

oe

Clean

tape

contact

area

with

the

PS

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

a

lint-free

cloth

dampened

with

pure

isopropyl

alcohol).

A:

Oil

refilling

(The

indicated

point

should

be

lubricated

with

high

quality

spindle

oil

every

1000

hrs).

This

model

has

no

adjusting

parts

for

torques,

tension,

etc.

If

the

reading

is

outside

the

specified

range,

clean

or

replace

the

part.

REMOVAL

AND

REASSEMBLY

OF

CASSETTE

HOUSING

CONTROL

ASSEMBLY

Notes:

1.

During

removal

and

reassembly,

be

careful

not

to

strike

the

nearby

guide

pin,

drum,

etc.

2:

Before

removal

or

reassembly,

be

sure

to

unplug

the

recorder

from

the

AC

outlet.

3.

When

removing

and

attaching

the

cassette

loading

belt,

be

careful

to

keep

it

free

from

grease.

Removal

_

Put

the

unit

in

the

cassette

eject

position.

_

Remove

the

cassette

loading

belt

©.

Disconnect

the

FFC

(Full

Flat

Cable)

@

at

the

right

side

of

the

cassette

housing

control

assembly.

Note:

Be

careful!

not

to

break

the

FFC.

4.

Remove

the

two

cassette

housing

installation

screws.

_

Move

the

cassette

housing

control

assembly

(Fig.

1-1)

in

the

direction

of

arrow

=>

®,

and

pull

it

out

straight

upward.

wn—

@

wi

e®

Reassembly

1.

Insert

the

tabs

of

the

cassette

housing

contro!

assembly

into

the

mechanism

chassis,

move

it

in

the

direction

of

arrow

>

@,

and

secure

tem-

porarily.

Check

to

see

if

the

cassette

housing

control

assembly

is

in

the

correct

position,

and

then

tighten

the

two

screws

(XHPS330PO06WSO)

.

_

Attach

the

cassette

loading

belt

©.

|

Connect

the

FFC

@

at

the

right

side

of

the

cassette

housing

control

assembly.

Ww

A

(D

Cassette

loading

belt

@

FFC

ball

1

—

bed

For

~

HM

—

1

=f

HELE

+

i

Insert

the

tabs

of

the

cassette

housing

into

the

GL,

mechanism

chassis.

Figure

1-1.

(Full

flat

cable}

V¥U-

760

VC-790ET

REPLACEMENT

OF

WORM

WHEEL

ASSEMBLY

e

Removal

(Fig.

1

-

2)

1.

Unsolder

the

cassette

switch

connector

from

the

start

sensor

PWB

@

2?

Release

the

two

catches

@on

the

cassette

housing

frame

(R),

and

remove

the

PWB.

3.

Unscrew

one

B

tight

screw

@

to

detach

the

worm

bracket

@.

Note:

The

bearing

@

can

come

off

position

too.

So

be

careful

not

to

let

the

bearing

fall.

4.

Remove

the

worm

shaft

assembly

©,

pulley

©

and

cassette

loading

belt

@

all

from

the

cassette

housing

frame

(R).

5.

Finally

pull

the

worm

wheel

assembly

out

of

the

boss

of

the

cassette

housing

frame

(R).

e

Reassembly

(Fig.

1-2)

1.

Turn

the

phase

gear

@

clockwise

until

the

slider

comes

to

a

halt

in

the

cassette

insertion

direction.

2.

Set

up

the

worm

wheel

gear

assembly

onto

the

boss

on

the

cassette

housing

frame

(R),

matching

the

mark

©

on

the

phase

gear

@

with

the

mark

®

on

the

worm

wheel

gear.

Note:

Make

sure

that

the

slider

pin

is

in

the

groove

of

the

drive

gear

arm.

3.

Install!

the

pulley

©

and

apply

the

cassette

loading

belt

@

both

on

the

worm

shaft

assembly

©.

Couple

the

clutch

@

to

the

clutch

lever

©.

|

And

mount

them

together

in

the

cassette

housing

frame

(R)

.

4.

Attach

the

worm

bracket

@

to

the

worm

shaft

assembly

@.

Place

them

onto

the

boss

on the

cassette

housing

frame

(R).

5.

Tighten

one

B

tight

screw

@.

Note:

Make

sure

that

the

parts

©

and

©

of

the

cassette

housing

frame

(R)

are

properly

engaged

with

the

parts

©

and

©

of

the

worm

bracket

@.

6.

Hook

the

start

sensor

PWB®@

on

the

two

positions

®

on

the

cassette

housing

frame

(R).

Note:

Check

that

the

switch

connector

is

right

in

the

cassette

switch

mounting

hole

©.

7.

Finally

resolder

the

cassette

switch

connector

to

the

start

sensor

PWB.

Notes:

1.

Do

not

overtighten

the

B

tight

screw

(no

more

than

5.0+0.5

kg.

cm),

because

otherwise

the

lower

threads

of

the

screw

hole

at

the

resin-

made

boss

may

be

broken.

2.

Keep

in

mind

that

the

clutch

switching

lever

should

be

in

the

correct

positional

relation.

The

mechanism

might

malfunction

even

if

the

lever

‘comes

slightly

out

of

position.

Vie

OV

\

VC-790ET

Figure

1-2

{a).

Cassette

housing

frame

(R)

“

Sie

Connector

op

@

é

2

x

8)

Pulley

‘Le

:

wS

sigs

|

“DY

Sarg

e

2h

“RAY

SN

at

~.

nae

;

.

4

Clutch

PS

a

“i

wr

é

5)

Worm

shaft

ass‘y

ee

x

(8)

Cassette

SW

eee

mounting

hole

Mes

(1)

Start

sensor

PWB

~

s

©)

a.

>

>

2)

Drive

gear

arm

~

;

ee

a

groove

@)

Bearing

|

ot,

(3)

Worm

bracket

(2)

B

tight

screw

{LX-HZ3046GEFD)

Worm

wheel

gear

8)

Phase

gear

Figure

1-2

(b).

@

Reassembly

of

drive

gear

(Fig.1-

3)

1.

Pass

the

tip

of

the

drive

gear

spring

(R}

@

through

the

square

hole

@

of

the

drive

gear

(R)

@

to

the

hook

the

spring

in

position.

2.

Hook

one

end

©

of

the

reciprocating

spring

@

to

the

catch

©

of

the

drive

gear

(R)

@.

3.

Hook

the

other

end

©

of

the

reciprocating

spring

@

to

the

catch

©

of

the

worm

wheel

@.

4.

Fit

the

drive

gear

(R)

M

to

the

worm

wheel

@

so

that

the

catch

@

and

boss

@

on

the

drive

gear

(R)

are

exactly

in

the

square

hole

@

and

round

hole

(,

Respectively,

in

the

worm

wheel.

(1)

Drive

gear

{R}

2

Drive

gear

spring

(R)

/.

REPLACEMENT

OF

CASSETTE

LOADING

_

BELT

®

Replacement

(Fig.

1-4)

1.

Remove

the

start

sensor

PWB

and

worm

bracket

from

the

cassette

housing

frame

(R).

2:

Remove

the

worm

shaft

assembly,

pulley

and

cassette

loading

belt

from

the

cassette

housing

frame

(R).

.

3.

Replace

the

cassette

loading

belt

with

a

new

one.

Notes:

1.

Do

not

overtighten

the

B

tight

screw

which

holds

the

worm

bracket

in

position.

The

specified

tightening

torque

is

5.0

+

0.5kg.

cm.

2.

Make

sure

that

the

cassette

loading

belt,

being

applied

in

the

cassette

housing

frame

(R),

is

free

from

grease.

if

stained

with

grease,

clean

the

belt

with

the

specific

cleaning

liquid.

3.

Finally

check

the

clutch

switching

lever

for

its

specified

points.

Cassette

loading

belt

Worm

shaft

ass‘y

Figure

1-4.