JVC TM-R14U Manual de usuario

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NOT

FOR

SALE

SERVICE

MANUAL

COLOR

VIDEO

MONITOR

MODEL

CONTENTS

Safety

Precaution

. .

Features

Outline

Functions

How

Remove

for

Service

Adjustment

Replacement

Parts

List

Packing

Diagram

With

SCHEMATIC

DIAGRAM

SPECIFICATIONS

Dimensions

36.0

(

)

41.0

(

)

32.4

(

)

Weight

18.4

Color

System

Resolution

Signal

(

analog

)

0.7

Positive

Bridge

Connected

INPUT

(

BNC

Connector

)

NTSC

400

Lines

(

the

center

)

OUTPUT

(

BNC

Connector

)

Video

INPUT

(

)

Comp

Video

(

BNC

Connector

)

120

Power

Input

Power

Consumption

(

max

)

(

avg

)

deflection

Viewable

Picture

Size

28.5

(

)

21.3

(

)

(

zero

beam

current

)

Cannon

Connector

Type

(

See

page

)

Positive

(

Nega

Sync

)

Picture

Tube

•

Video

0.7

Positive

Video

OUTPUT

(

)

Bridge

Connected

Video

INPUT

(

BNC

Connector

)

High

Voltage

Remote

Tally

Sync

INPUT

(

ext

)

Comp

Video

(

BNC

Connector

)

Tube

Transistor

Positive

(

Nega

Sync

)

Sync

GND

System

GND

System

(

LIVE

EARTH

NEUTRAL

ihr

)

(

Design

and

specifications

subject

change

without

notice

)

—

Negative

Bridge

Connected

Sync

INPUT

Sync

OUTPUT

5741

Aug

1985

SAFETY

PRECAUTION

(

}

Dielectric

Strength

Test

The

isolation

between

the

primary

circuit

and

all

metal

parts

exposed

the

user

particularly

any

exposed

metal

part

having

return

path

the

chassis

should

withstand

voltage

100

(

)

for

period

one

second

Withstand

voltage

100

(

)

appliance

rated

120

and

000

(

)

appliance

rated

200

for

period

one

second

This

method

test

requires

test

equipment

not

generally

found

the

service

trade

(

)

Leakage

Current

Check

Plug

the

line

cord

directly

into

the

outlet

(

not

use

line

isolation

transformer

during

this

check

)

Using

“

Leakage

Current

Tester

measure

the

leakage

current

from

each

exposed

metal

part

the

cabinet

particularly

any

exposed

metal

part

having

return

path

the

chassis

known

good

earth

ground

(

water

pipe

etc

)

Any

leakage

current

must

not

exceed

0.5

(

)

Alternate

Check

Method

Plug

the

line

cord

directly

into

the

outlet

(

not

use

line

isolation

transformer

during

this

check

)

Use

voltmeter

having

000

ohms

per

volt

sensitivity

the

following

manner

Connect

50012

resistor

paralleled

0.15

juF

type

capacitor

between

exposed

metal

part

and

known

good

earth

ground

(

water

pipe

etc

)

Measure

the

voltage

across

the

resistor

with

the

voltmeter

Move

the

resistor

connection

each

exposed

metal

part

particularly

any

exposed

metal

part

having

return

path

the

chassis

and

measure

the

voltage

across

the

resistor

Now

reverse

the

plug

the

outlet

and

repeat

each

measurement

Any

voltage

measured

must

not

exceed

0.35

(

)

This

corresponds

0.5

(

)

The

design

this

product

contains

special

hardware

many

circuits

and

components

specially

for

safety

purposes

For

continued

protection

changes

should

made

the

original

design

unless

authorized

writing

the

manufacturer

Replacement

parts

must

identical

those

used

the

original

circuits

Service

should

performed

qualified

personnel

only

Alterations

the

design

circuitry

receiver

should

‘

not

made

Any

design

alterations

additions

will

void

the

manu

facturer

warranty

and

will

further

relieve

the

manufacturer

responsibility

for

personal

injury

property

damage

resulting

therefrom

Many

electrical

and

mechanical

parts

television

sets

have

special

safety

characteristics

These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

the

protection

afforded

them

necessarily

obtained

using

replacement

components

rated

for

higher

voltage

wattage

etc

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

the

parts

list

Service

manual

Electrical

components

having

such

features

are

identified

shading

the

schematics

and

(

)

the

parts

list

Service

manual

The

use

sub

stitute

replacement

which

does

not

have

the

same

safety

char

acteristics

the

recommended

replacement

part

shown

the

parts

list

Service

manual

many

create

shock

fire

other

hazards

Use

isolation

transformer

when

hot

chassis

The

chassis

and

any

sub

chassis

contrained

some

product

are

connected

one

side

the

power

line

isolation

trans

former

adequate

capacity

should

inserted

between

the

pro

duct

and

the

power

supply

point

while

performing

any

service

some

product

when

the

HOT

chassis

exposed

Don

short

between

the

LIVE

side

ground

and

NEUTRAL

side

grounding

EARTH

side

ground

when

repairing

Some

model

power

circuit

partly

different

the

GND

The

difference

the

GND

shown

the

LIVE

(

)

side

GND

the

NEUTRAL

(

)

side

GND

and

EARTH

(

)

side

GND

Don

short

between

the

LIVE

side

GND

and

NEUTRAL

side

GND

EARTH

side

GND

and

never

measure

with

measuring

apparatus

(

oscilloscope

etc

)

the

LIVE

side

GND

and

NEUTRAL

side

GND

EARTH

side

GND

the

same

time

above

note

will

not

kept

fuse

any

parts

will

broken

any

repair

has

been

made

the

chassis

recommended

that

the

setting

should

checked

adjusted

(

See

ADJUST

MENT

VOLTAGE

)

The

high

voltage

applied

the

picture

tube

must

conform

with

that

specified

Service

manual

Excessive

high

voltage

can

cause

increase

Ray

emission

arcing

and

possible

component

damage

therefore

operation

under

excessive

high

voltage

condi

tions

should

kept

minimum

should

prevented

severe

arcing

occurs

remove

the

power

immediately

and

determine

the

cause

visual

inspection

(

incorrect

installation

cracked

melted

high

voltage

harness

poor

soldering

etc

)

maintain

the

proper

minimum

level

soft

Ray

emission

components

the

high

voltage

circuitry

including

the

picture

tube

must

the

exact

replacements

alternatives

approvided

the

manufacturer

the

complete

product

not

check

high

voltage

drawing

arc

Use

high

voltage

meter

high

voltage

probe

with

VTVM

Discharge

the

picture

tube

before

attempting

meter

connection

connecting

clip

lead

the

ground

frame

and

connecting

the

other

end

the

lead

through

resistor

the

anode

button

When

service

required

observe

the

original

lead

dress

Extra

precaution

should

given

assure

correct

lead

dress

the

high

voltage

circuit

area

Where

short

circuit

has

occurred

those

components

that

indicate

evidence

overheating

should

replaced

Always

use

the

manufacturer

replacement

com

ponents

Isolation

Check

(

Safety

for

Electrical

Shock

Hazard

)

After

assembling

the

product

always

perform

isolation

check

the

exposed

metal

parts

the

cabinet

(

antenna

terminals

channel

selector

knobs

metal

cabinet

screwheads

earphone

jack

control

shafts

etc

)

sure

the

product

safe

operate

without

danger

electrical

shock

VOLTMETER

(

HAVING

1000

SENSITIVITY

)

0.15

TYPE

PLACE

THIS

PROBE

EACH

EXPOSED

METAL

PART

—

1500

GOOD

EARTH

GROUND

High

voltage

hold

down

circuit

check

After

repair

the

high

voltage

hold

down

circuit

this

circuit

shall

checked

operate

correctly

See

item

“

How

check

the

high

voltage

hold

down

circuit

(

5741

)

FEATURES

With

two

way

VIDEO

INPUT

terminals

(

Bridge

Termination

)

Two

video

input

terminals

are

equipped

and

bridged

respectively

Change

over

the

two

input

terminals

performed

the

front

input

switch

for

changing

With

EXT

SYNC

INPUT

terminal

(

Bridge

Termination

)

Ext

sync

input

terminal

equipped

and

bridged

that

this

set

can

monitor

sync

video

signal

When

choosing

int

sync

ext

sync

change

over

the

front

sync

switch

With

REMOTE

TALLY

terminal

Tally

lamp

sync

(

INT

EXT

)

scan

(

WIDE

NARR

)

color

(

OFF

)

input

(

)

possible

operation

COMB

FILTER

equipped

for

reproducing

the

high

resolution

screen

UNDER

SCAN

circuit

equipped

Switch

for

overscan

screen

underscan

screen

changeover

used

check

screen

frame

screen

square

Use

metal

cabinet

unaffected

magnetism

other

appliance

Blue

check

switch

equipped

for

producing

blue

signal

color

the

screen

Use

SEMI

HIGH

RESOLUTION

PICTURE

TUBE

functioning

monitor

With

terminals

(

analog

)

Adopts

terminals

power

supply

cord

Adopts

GND

System

(

LIVE

NEUTRAL

jbr

EARTH

)

OUTLINE

BLUE

CHECK

SWITCH

Switching

the

front

Blue

Check

switch

increases

col

lector

voltage

output

transistor

respectively

and

causes

the

CRT

cut

off

that

the

screen

becomes

blue

single

color

Color

and

tint

adjustments

can

performed

correctly

inputting

color

bar

signal

(

order

brightness

)

and

displaying

blue

signal

REMOTE

TALLY

(

CANNON

TYPE

)

The

change

over

TALLY

LAMP

(

OFF

)

SYNC

(

INT

EXT

)

SCAN

(

WIDE

NARR

)

COLOR

(

OFF

)

and

INPUT

(

)

possible

remote

control

When

lighting

tally

lamp

with

external

power

source

change

tally

lamp

switch

within

control

Board

from

INT

side

into

EXT

side

EXAMPLE

CIRCUIT

SCAN

CIRCUIT

Setting

the

front

SCAN

switch

NARR

side

causes

the

Height

Relay

changes

OFF

coils

are

connected

series

and

inductance

increases

Accordingly

electric

current

which

flows

through

deflection

coil

decreases

and

amplitude

becomes

smaller

Height

Switching

transistor

OFF

NARR

HEIGHT

connected

HEIGHT

series

negative

feedback

amount

increases

and

Height

becomes

smaller

Rotating

clockwise

decreases

negative

feedback

amount

and

makes

Height

larger

Rotating

counter

clockwise

makes

Height

smaller

EXT

INT

Tally

Switch

EXT

TALLY

INT

Tally

Lamp

TALLY

SYNC

INT

—

EXT

TALLY

REMOTE

TERMINAL

ACC

(

OFF

)

SWITCH

OFF

Switch

for

ACC

circuit

This

switch

has

been

turned

the

factory

(

ACC

circuit

functions

)

but

turn

this

switch

off

when

ACC

circuit

need

not

actuated

For

reproducing

input

video

signals

faithfully

ACC

circuit

can

switched

off

for

the

location

ACC

(

OFF

)

switch

refer

ALIGNMENT

LOCATION

schematic

diagram

WIDE

—

NARR

SCAN

SWITCH

COLOR

—

OFF

INPUT

—

OPEN

GND

(

5741

)

BLOCK

DIAGRAM

(

COMB

FILTER

CIRCUIT

INPUT

—

WAVE

FORMER

SYNC

SEPA

CIRCUIT

BUFFER

CHROMA

VIDEO

AMP

CIRCUIT

AMP

CIRCUIT

OUTPUT

CIRCUIT

CRT

SWITCH

DRIVE

(

)

AMP

CIRCUIT

(

)

AMP

CIRCUIT

AMP

TRANSFORMER

SWITCHING

RECT

501

ADJ

POWER

CONTROL

POWER

DRIVE

POWER

OUT

POWER

TRANSF

POWER

SOURCE

(

5741

)

FUNCTIONS

FRONT

VIEW

(

)

(

)

(

)

INPUT

SELECT

BUTTON

When

exercising

remote

control

with

the

rear

remote

terminal

set

INPUT

SYNC

SELECT

(

INT

EXT

)

BUTTON

Switch

for

INT

SYNC

EXT

SYNC

Change

over

When

exercising

remote

control

with

the

rear

remote

terminal

set

(

)

NOTCH

(

OFF

)

BUTTON

OFF

switch

for

NOTCH

circuit

functions

crease

dot

obstacles

the

top

and

button

outline

part

picture

This

switch

however

decreases

resolution

and

switch

OFF

unnecessary

COLOR

(

OFF

)

BUTTON

Switch

for

color

screen

monochrome

screen

change

over

used

check

white

balance

adjustment

HOLD

CONTROL

KNOB

(

)

TINT

CONTROL

KNOB

(

)

COLOR

CONTROL

KNOB

(

)

BRIGHT

CONTROL

KNOB

(

)

CONTRAST

CONTROL

KNOB

(

APERTURE

CONTROL

KNOB

Turn

APERTURE

control

knob

that

the

picture

turns

soft

and

clear

(

)

(

)

SUB

CONTROL

The

standard

state

each

control

knob

can

preset

with

each

SUB

VRs

First

set

each

control

knob

the

click

position

rotate

each

SUB

VRs

with

thin

screw

driver

and

adjust

obtain

the

most

suitable

state

(

)

SUB

TINT

CONTROL

(

)

SUB

COLOR

CONTROL

(

)

SUB

BRIGHT

CONTROL

SUB

CONTRAST

CONTROL

(

)

SUB

APERTURE

CONTROL

(

5741

)

(

)

DEGAUSS

BUTTON

Switch

for

degaussing

picture

tube

deguss

push

this

switch

for

ten

seconds

when

degaussing

over

again

push

intervals

ten

minutes

POWER

BUTTON

POWER

IND

Switch

for

power

this

set

Power

switched

and

then

power

indicator

lamp

lighted

TALLY

LAMP

SWITCH

Lighting

internal

power

source

(

when

shipping

)

short

between

(

)

and

(

)

TALLY

terminal

Lighting

External

power

source

(

)

First

set

TALLY

switch

within

the

set

EXT

side

(

)

Give

between

(

)

and

(

)

TALLY

terminal

BLUE

CHECK

BUTTON

Switch

for

ordinary

screen

blue

monochrome

screen

changeover

used

adjust

TINT

and

COLOR

easily

(

How

adjust

)

(

)

First

input

color

bar

signal

and

make

blue

mono

chrome

screen

(

)

Adjust

TINT

and

COLOR

control

knob

alter

nately

that

each

blue

band

same

density

and

brightness

;

and

then

TINT

and

COLOR

adjusted

correctly

SCAN

(

WIDE

NARR

)

BUTTON

Switch

for

overscan

screen

underscan

screen

change

over

used

check

screen

frame

screen

square

(

5741

)

(

)

VIDEO

(

)

TERMINALS

SWITCH

The

Terminals

for

monitoring

connecting

the

video

output

from

video

camera

VCR

other

equipment

OPEN

When

the

bridge

output

NOT

required

obtain

the

bridge

output

See

—

Page

Fig

(

SYNC

TERMINALS

SWITCH

INPUT

terminal

(

)

Comp

sync

signal

Comp

video

signal

OUTPUT

terminal

Bridge

output

terminal

(

SKEW

SWITCH

Switch

for

the

changeover

the

fixed

number

during

AFC

horizontal

deflection

circuit

Compensates

skewed

display

the

upper

part

the

screen

caused

VCR

play

back

tape

deterioration

other

factors

)

(

)

REMOTE

TALLY

TERMINAL

This

terminal

performs

INPUT

COLOR

SCAN

SYNC

switch

changeover

and

controlling

turning

OFF

TALLY

lamp

from

the

outside

)

POWER

SOURCE

INLET

(

)

FOCUS

(

)

SCREEN

(

)

ACC

SWITCH

OFF

switch

for

ACC

circuit

This

switch

has

been

turned

the

factory

(

ACC

circuit

functions

)

but

turn

this

switch

OFF

when

ACC

circuit

need

not

actuated

(

)

SET

SWITCH

NORMAL

side

SET

side

(

DECODE

RGB

SWITCH

DECODE

side

RGB

side

Normal

picture

horizontal

line

will

appear

Use

Input

terminals

Use

terminal

OUT

TERMINAL

SWITCH

INPUT

signal

input

sync

signal

into

sync

terminal

switch

changeover

side

For

inputting

only

INPUT

terminal

•

OPEN

side

For

taking

bridge

output

through

out

terminal

(

5741

)

HOW

REMOVE

FOR

SERVICE

REAR

PANEL

REMOVAL

Unscrew

the

sixteen

screws

shown

Fig

TOP

PANEL

REMOVAL

Unscrew

the

seven

screws

shown

Fig

after

moving

the

four

screws

the

top

the

rear

panel

FRONT

PANEL

REMOVAL

Unscrew

the

seven

screws

(

)

shown

Fig

FRONT

CONTROL

BOARD

REMOVAL

After

removing

the

front

panel

and

wire

clamp

Front

control

Board

can

drawn

forward

MAIN

CHASSIS

REMOVAL

Unscrew

the

two

screws

(

)

shown

Fig

Then

remove

the

anode

wire

and

other

wires

(

neces

sary

)

from

the

wire

clamp

Withdraw

the

chassis

backward

along

the

rail

When

conducting

check

with

power

supplied

sure

confirm

that

the

CRT

earth

wire

connected

the

CRT

socket

board

and

chassis

Fig

WIRE

CLAMPING

AND

TYING

BAND

sure

clamp

the

wire

Never

remove

the

tying

band

used

for

wire

clamping

Should

removed

sure

reclamp

the

wire

its

original

position

(

sure

use

insulating

material

)

Fig

(

5741

)

SERVICE

ADJUSTMENT

PURITY

Display

monochrome

pattern

viewed

from

the

back

(

See

Fig

)

turn

the

magnet

lock

counter

clockwise

loosen

Turn

the

green

cutoff

(

717

)

fully

clockwise

and

the

red

and

blue

cutoff

VRs

(

718

716

)

fully

counter

clockwise

(

Fig

)

Adjust

the

screen

that

the

green

band

becomes

easy

see

Loosen

the

deflection

yoke

securing

screw

and

slide

the

yoke

fully

rearward

obtain

color

shading

the

green

band

Overlap

the

two

purity

magnet

tabs

and

set

them

clock

position

Open

and

the

two

purity

magnets

(

scissor

fashion

)

and

adjust

that

the

green

band

positioned

the

center

the

picture

green

band

not

obtained

adjust

for

uniform

overall

coloration

Slide

the

deflection

yoke

forward

and

adjust

its

position

that

the

green

color

completely

fills

the

picture

area

Confirm

that

uniform

overall

rasters

both

red

and

blue

single

color

can

also

obtained

the

same

manner

Secure

the

deflection

yoke

retaining

screw

moderately

that

the

deflection

yoke

does

not

move

back

and

forth

Fig

[

Rear

View

]

DRIVE

CUTOFF

STATIC

CONVERGENCE

(

CENTER

)

Employ

crosshatch

pattern

and

adjust

the

brightness

that

the

image

clear

but

slightly

darkened

Turn

the

red

and

blue

cutoff

VRs

fully

clockwise

and

the

green

cutoff

fully

counter

clockwise

(

Fig

)

Adjust

the

screen

for

easily

seen

image

Adjust

convergence

roughly

the

corner

tilting

the

deflection

yoke

vertically

horizontally

Turn

the

two

pole

convergence

magnets

and

adjust

that

red

and

blue

become

overlapped

throughout

the

picture

area

yield

magenta

(

Fig

)

Turn

the

green

cutoff

full

clockwise

and

adjust

the

two

pole

convergence

magnets

that

the

green

and

magenta

become

overlapped

throughout

the

picture

area

yield

white

(

Fig

)

Repeat

steps

and

CRT

SOCKET

ASS

Fig

Green

band

Center

Adjust

center

green

band

Fig

Green

—

Magenta

(

Fig

(

5741

)

WHITE

BALANCE

[

FRONT

VIEW

]

Display

monochrome

pattern

Select

the

SET

switch

from

normal

set

and

horizontal

line

will

appear

(

Fig

)

Turn

the

red

blue

and

green

cutoff

VRs

(

718

716

717

)

and

the

screen

fully

counterclockwise

eliminate

luminance

Gradually

turn

the

screen

clockwise

where

single

line

one

the

colors

appears

Turn

the

cutoff

this

color

clockwise

about

degrees

Again

turn

the

screen

that

this

color

appears

only

faintly

Adjust

the

other

cutoff

VRs

that

the

horizontal

line

becomes

white

Return

the

SET

switch

from

set

normal

and

then

display

monochrome

pattern

With

dark

picture

perform

fine adjustment

obtain

optimum

white

balance

With

bright

picture

adjust

the

red

and

green

drive

VRs

for

optimum

white

balance

HORIZONTAL

LINE

VERTICAL

CENTER

(

identified

with

white

notch

)

Bring

the

horizontal

line

nearest

the

white

notches

shown

the

dotted

circles

Fig

HORIZONTAL

LINE

Set

the

rear

SET

switch

from

NORMAL

side

SET

side

VOLTAGE

Cut

off

the

picture

the

bright

control

and

sub

bright

Measure

the

voltage

between

the

main

Board

ass

and

(

yfrr

)

Adjust

adjustment

obtain

110

HEIGHT

CENTER

Inputting

cross

hatch

pattern

Set

the

SCAN

switch

WIDE

and

adjust

HEIGHT

that

raster

becomes

viewable

picture

size

Adjust

LIN

that

the

top

and

bottom

screen

become

symmetrical

set

SCAN

switch

NARR

and

adjust

NARR

HEIGHT

that

raster

the

inside

(

about

from

top

and

bottom

respectively

)

the

end

view

able

picture

size

(

Fig

)

When

raster

position

not

located

correctly

adjust

CENTER

the

optimum

vertical

picture

position

Repeat

items

•

The

tester

used

should

periodically

calibrated

BRIGHT

CONTRAST

Display

signal

Set

the

contrast

control

and

bright

control

the

center

position

Adjust

the

sub

contrast

sub

bright

for

opti

mum

display

GAIN

Input

video

signals

(

rectangular

waves

sinusoidal

waves

)

(

set

switch

the

7512

side

)

into

the

(

red

)

terminal

among

the

INPUT

terminals

Connect

oscilloscope

the

and

adjust

the

GAIN

that

its

output

becomes

0.7

Similarly

adjust

the

(

green

)

and

(

blue

)

GAIN

WIDTH

COIL

CENTER

Set

the

SCAN

switch

WIDE

and

adjust

WIDTH

coil

(

503

)

that

raster

become

viewable

picture

size

(

Fig

)

SUB

APERTURE

Set

the

aperture

control

the

center

position

Adjust

the

sub

aperture

for

optimum

display

turning

the

APERTURE

KNOB

confirm

that

changes

occur

from

soft

screen

clear

screen

(

5741

)

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