JVC TM-R14U User manual

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TM

-

R

14

U

8

CS

SHOP

copy

NOT

FOR

SALE

W

*

SERVICE

MANUAL

14

"

COLOR

VIDEO

MONITOR

TM

-

R

14

U

MODEL

CONTENTS

Safety

Precaution

.

.

.

. .

.

Features

Outline

Functions

How

to

Remove

for

Service

Service

Adjustment

Replacement

Parts

List

.

.

Packing

Diagram

2

3

3

-

4

5

-

7

8

9

-

11

12

-

23

24

With

SCHEMATIC

DIAGRAM

SPECIFICATIONS

Dimensions

:

36.0

cm

(

W

)

x

41.0

(

D

)

x

32.4

cm

(

H

)

Weight

:

18.4

kg

Color

System

Resolution

.

R

.

G

.

B

Signal

(

analog

)

0.7

Vp

-

p

,

75

12

,

Positive

Bridge

-

Connected

to

R

.

G

.

B

INPUT

.

R

.

G

.

B

INPUT

.

(

BNC

Connector

)

NTSC

400

Lines

or

more

(

at

the

center

)

R

.

G

.

B

OUTPUT

(

BNC

Connector

)

Video

INPUT

(

A

&

B

)

.

.

Comp

.

Video

(

BNC

Connector

)

AC

120

V

,

60

Hz

Power

Input

Power

Consumption

.

.

60

W

(

max

,

)

,

45

W

(

avg

.

)

14

'

,

90

°

deflection

Viewable

Picture

Size

.

28.5

cm

(

W

)

x

21.3

cm

(

H

)

.

.

24

kV

±

1

kV

(

at

zero

beam

current

)

.

7

Pin

Cannon

Connector

Type

(

See

page

3

.

)

,

1

Vp

-

p

,

75

12

,

Positive

,

(

Nega

.

Sync

.

)

Picture

Tube

•

Video

0.7

Vp

-

p

,

75

12

,

Positive

,

Video

OUTPUT

(

A

/

B

)

.

Bridge

-

Connected

to

Video

INPUT

.

(

BNC

Connector

)

High

Voltage

Remote

Tally

Sync

.

INPUT

(

ext

.

)

.

.

.

Comp

.

Video

(

BNC

Connector

)

Tube

..

.

Transistor

1

1

Vp

-

p

,

75

12

,

Positive

(

Nega

.

Sync

.

)

73

1

C

8

.

.

Sync

.

GND

System

3

-

GND

System

(

LIVE

:

-

L

,

EARTH

:

i

&

NEUTRAL

:

ihr

)

(

Design

and

specifications

subject

to

change

without

notice

)

1

—

4

Vp

-

p

,

75

12

,

Negative

Bridge

Connected

to

Sync

.

INPUT

Sync

.

OUTPUT

No

.

5741

Aug

.

1985

TM

-

R

14

U

SAFETY

PRECAUTION

(

1

}

Dielectric

Strength

Test

The

isolation

between

the

AC

primary

circuit

and

all

metal

parts

exposed

to

the

user

,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis

should

withstand

a

voltage

of

1

,

100

V

AC

(

r

.

m

.

s

.

)

for

a

period

of

one

second

.

Withstand

a

voltage

of

1

,

100

V

AC

(

r

.

m

.

s

.

)

to

an

appliance

rated

up

to

120

V

,

and

3

,

000

V

AC

(

r

.

m

.

s

.

)

to

an

appliance

rated

200

V

or

more

,

for

a

period

of

one

second

.

This

method

of

test

requires

a

test

equipment

not

generally

found

in

the

service

trade

.

(

2

)

Leakage

Current

Check

Plug

the

AC

line

cord

directly

into

the

AC

outlet

(

do

not

use

a

line

isolation

transformer

during

this

check

.

)

.

Using

a

“

Leakage

Current

Tester

"

,

measure

the

leakage

current

from

each

exposed

metal

part

of

the

cabinet

,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis

,

to

a

known

good

earth

ground

(

water

pipe

,

etc

.

)

.

Any

leakage

current

must

not

exceed

0.5

mA

AC

(

r

.

m

.

s

.

)

.

Alternate

Check

Method

Plug

the

AC

line

cord

directly

into

the

AC

outlet

(

do

not

use

a

line

isolation

transformer

during

this

check

.

)

.

Use

an

AC

voltmeter

having

,

1

,

000

ohms

per

volt

or

more

sensitivity

in

the

following

manner

.

Connect

a

1

,

50012

10

W

resistor

paralleled

by

a

0.15

juF

AC

-

type

capacitor

between

an

exposed

metal

part

and

a

known

good

earth

ground

(

water

pipe

,

etc

.

)

.

Measure

the

AC

voltage

across

the

resistor

with

the

AC

voltmeter

.

Move

the

resistor

connection

to

each

exposed

metal

part

,

particularly

any

exposed

metal

part

having

a

return

path

to

the

chassis

,

and

measure

the

AC

voltage

across

the

resistor

.

Now

,

reverse

the

plug

in

the

AC

outlet

and

repeat

each

measurement

.

Any

voltage

measured

must

not

exceed

0.35

V

AC

(

r

.

m

.

s

.

)

.

This

corresponds

to

0.5

mA

AC

(

r

.

m

.

s

.

)

.

1

.

The

design

of

this

product

contains

special

hardware

,

many

circuits

and

components

specially

for

safety

purposes

.

For

continued

protection

,

no

changes

should

be

made

to

the

original

design

unless

authorized

in

writing

by

the

manufacturer

.

Replacement

parts

must

be

identical

to

those

used

in

the

original

circuits

.

Service

should

be

performed

by

qualified

personnel

only

.

2

.

Alterations

of

the

design

or

circuitry

of

receiver

should

‘

not

be

made

.

Any

design

alterations

or

additions

will

void

the

manu

-

facturer

'

s

warranty

and

will

further

relieve

the

manufacturer

of

responsibility

for

personal

injury

or

property

damage

resulting

therefrom

.

3

.

Many

electrical

and

mechanical

parts

in

television

sets

have

special

safety

-

related

characteristics

.

These

characteristics

are

often

not

evident

from

visual

inspection

nor

can

*

the

protection

afforded

by

them

necessarily

be

obtained

by

using

replacement

components

rated

for

higher

voltage

,

wattage

,

etc

.

Replacement

parts

which

have

these

special

safety

characteristics

are

identified

in

the

parts

list

of

Service

manual

.

Electrical

components

having

such

features

are

identified

by

shading

on

the

schematics

and

by

(

A

)

on

the

parts

list

in

Service

manual

.

The

use

of

a

sub

-

stitute

replacement

which

does

not

have

the

same

safety

char

-

acteristics

as

the

recommended

replacement

part

shown

in

the

parts

list

in

Service

manual

many

create

shock

,

fire

,

or

other

hazards

.

4

.

Use

isolation

transformer

when

hot

chassis

.

The

chassis

and

any

sub

-

chassis

contrained

in

some

product

are

connected

to

one

side

of

the

AC

power

line

.

An

isolation

trans

-

former

of

adequate

capacity

should

be

inserted

between

the

pro

-

duct

and

the

AC

power

supply

point

while

performing

any

service

on

some

product

when

the

HOT

chassis

is

exposed

.

5

.

Don

'

t

short

between

the

LIVE

side

ground

and

NEUTRAL

side

grounding

or

EARTH

side

ground

when

repairing

.

Some

model

'

s

power

circuit

is

partly

different

in

the

GND

.

The

difference

of

the

GND

is

shown

by

the

LIVE

(

_

L

.

)

side

GND

,

the

NEUTRAL

(

73

Ip

)

side

GND

and

EARTH

(

^

)

side

GND

.

Don

'

t

short

between

the

LIVE

side

GND

and

NEUTRAL

side

GND

or

EARTH

side

GND

and

never

measure

with

a

measuring

apparatus

(

oscilloscope

etc

.

)

the

LIVE

side

GND

and

NEUTRAL

side

GND

or

EARTH

side

GND

at

the

same

time

.

If

above

note

will

not

be

kept

,

a

fuse

or

any

parts

will

be

broken

.

6

.

If

any

repair

has

been

made

to

the

chassis

,

it

is

recommended

that

the

B

*

setting

should

be

checked

or

adjusted

(

See

ADJUST

-

MENT

OF

Bj

VOLTAGE

)

.

7

.

The

high

voltage

applied

to

the

picture

tube

must

conform

with

that

specified

in

Service

manual

.

Excessive

high

voltage

can

cause

an

increase

in

X

-

Ray

emission

,

arcing

and

possible

component

damage

,

therefore

operation

under

excessive

high

voltage

condi

-

tions

should

be

kept

to

a

minimum

,

or

should

be

prevented

.

If

severe

arcing

occurs

,

remove

the

AC

power

immediately

and

determine

the

cause

by

visual

inspection

(

incorrect

installation

,

cracked

or

melted

high

voltage

harness

,

poor

soldering

,

etc

.

)

.

To

maintain

the

proper

minimum

level

of

soft

X

-

Ray

emission

,

components

in

the

high

voltage

circuitry

including

the

picture

tube

must

be

the

exact

replacements

or

alternatives

approvided

by

the

manufacturer

of

the

complete

product

.

8

.

Do

not

check

high

voltage

by

drawing

an

arc

.

Use

a

high

voltage

meter

or

a

high

voltage

probe

with

a

VTVM

.

Discharge

the

picture

tube

before

attempting

meter

connection

,

by

connecting

a

clip

lead

to

the

ground

frame

and

connecting

the

other

end

of

the

lead

through

a

I

0

kl

2

2

W

resistor

to

the

anode

button

.

9

.

When

service

is

required

,

observe

the

original

lead

dress

.

Extra

precaution

should

be

given

to

assure

correct

lead

dress

in

the

high

voltage

circuit

area

.

Where

a

short

circuit

has

occurred

,

those

components

that

indicate

evidence

of

overheating

should

be

replaced

.

Always

use

the

manufacturer

'

s

replacement

com

-

ponents

.

10

.

Isolation

Check

(

Safety

for

Electrical

Shock

Hazard

)

After

re

-

assembling

the

product

,

always

perform

an

isolation

check

on

the

exposed

metal

parts

of

the

cabinet

(

antenna

terminals

,

channel

selector

knobs

,

metal

cabinet

,

screwheads

,

earphone

jack

,

control

shafts

,

etc

.

)

to

be

sure

the

product

is

safe

to

operate

without

danger

of

electrical

shock

.

AC

VOLTMETER

(

HAVING

1000

H

/

V

,

OR

MORE

SENSITIVITY

)

CQ

0.15

/

uF

AC

-

TYPE

O

^

PLACE

THIS

PROBE

ON

EACH

EXPOSED

METAL

PART

—

wv

—

*

1500

S

2

10

W

GOOD

EARTH

GROUND

11

.

High

voltage

hold

down

circuit

check

.

After

repair

of

the

high

voltage

hold

down

circuit

,

this

circuit

shall

be

checked

to

operate

correctly

.

See

item

“

How

to

check

the

high

voltage

hold

down

circuit

"

.

2

(

No

.

5741

)

TM

-

R

14

U

FEATURES

With

two

way

VIDEO

INPUT

terminals

(

Bridge

Termination

)

Two

video

input

terminals

are

equipped

and

bridged

respectively

.

Change

-

over

of

the

two

input

terminals

is

performed

by

the

front

input

switch

for

changing

IC

.

With

EXT

.

SYNC

.

INPUT

terminal

(

Bridge

Termination

)

Ext

.

sync

,

input

terminal

is

equipped

and

bridged

so

that

this

set

can

monitor

a

no

-

sync

,

video

signal

.

When

choosing

int

.

sync

,

or

ext

.

sync

.

,

change

-

over

IC

by

the

front

sync

,

switch

.

With

REMOTE

/

TALLY

terminal

Tally

lamp

,

sync

.

(

INT

/

EXT

.

)

,

scan

(

WIDE

/

NARR

)

,

color

(

ON

/

OFF

)

,

input

(

A

/

B

)

possible

operation

COMB

FILTER

equipped

for

reproducing

the

high

-

resolution

screen

.

UNDER

SCAN

circuit

equipped

Switch

for

overscan

screen

or

underscan

screen

changeover

is

used

to

check

screen

frame

or

screen

square

.

Use

of

a

metal

cabinet

unaffected

by

magnetism

or

other

appliance

.

Blue

check

switch

equipped

for

producing

a

blue

signal

color

on

the

screen

.

Use

of

a

SEMI

-

HIGH

RESOLUTION

PICTURE

TUBE

functioning

or

monitor

.

With

R

/

G

/

B

terminals

(

analog

)

.

Adopts

3

-

terminals

power

supply

cord

.

Adopts

3

-

GND

System

(

LIVE

:

_

L

,

NEUTRAL

:

-

jbr

&

EARTH

:

)

.

OUTLINE

BLUE

CHECK

SWITCH

Switching

on

the

front

Blue

Check

switch

increases

col

-

lector

voltage

of

R

.

or

G

.

output

transistor

respectively

and

causes

the

CRT

to

cut

off

so

that

the

screen

becomes

a

blue

single

color

.

Color

and

tint

adjustments

can

be

performed

correctly

by

inputting

a

color

-

bar

signal

(

in

order

of

brightness

)

and

displaying

a

blue

signal

.

REMOTE

/

TALLY

(

7

P

CANNON

TYPE

)

The

change

-

over

of

TALLY

LAMP

(

ON

/

OFF

)

,

SYNC

(

INT

/

EXT

)

,

SCAN

(

WIDE

/

NARR

)

,

COLOR

(

ON

/

OFF

)

and

INPUT

(

A

/

B

)

is

possible

by

a

remote

control

.

*

When

lighting

a

tally

lamp

with

an

external

power

source

,

change

a

tally

lamp

switch

within

control

PC

Board

from

INT

side

into

EXT

side

.

EXAMPLE

CIRCUIT

SCAN

CIRCUIT

Setting

the

front

SCAN

switch

to

NARR

side

causes

the

H

.

Height

:

Relay

changes

to

OFF

,

coils

are

connected

in

series

,

and

so

inductance

increases

.

Accordingly

,

electric

current

which

flows

through

a

deflection

coil

decreases

and

amplitude

becomes

smaller

.

V

.

Height

:

Switching

transistor

is

OFF

,

NARR

V

.

HEIGHT

VR

is

connected

to

V

.

HEIGHT

VR

in

series

,

negative

feedback

amount

increases

,

and

V

.

Height

becomes

smaller

.

Rotating

VR

clockwise

decreases

negative

feedback

amount

and

makes

V

.

Height

larger

.

Rotating

VR

counter

-

clockwise

makes

V

.

Height

smaller

.

f

B

r

-

_

1

EXT

INT

o

1

Tally

Switch

EXT

24

V

TALLY

o

INT

Tally

Lamp

TALLY

O

.

SYNC

INT

—

EXT

TALLY

/

REMOTE

TERMINAL

ACC

(

ON

/

OFF

)

SWITCH

ON

/

OFF

Switch

for

ACC

circuit

.

This

switch

has

been

turned

ON

at

the

factory

(

ACC

circuit

functions

)

,

but

turn

this

switch

off

when

ACC

circuit

need

not

be

actuated

.

For

reproducing

input

video

signals

more

faithfully

,

ACC

circuit

can

be

switched

off

.

*

As

for

the

location

of

ACC

(

ON

/

OFF

)

switch

,

refer

to

ALIGNMENT

LOCATION

on

schematic

diagram

.

WIDE

-

—

*

NARR

O

SCAN

>

to

SWITCH

Ol

COLOR

ON

-

—

OFF

0

^

0

|

-

~

Oj

INPUT

>

A

-

—

B

OPEN

GND

(

No

.

5741

)

3

TM

-

R

14

U

BLOCK

DIAGRAM

i

(

D

®

COMB

FILTER

CIRCUIT

INPUT

SW

IC

0

—

9

®

®

i

—

fr

WAVE

FORMER

SYNC

.

SEPA

.

CIRCUIT

11

&

BUFFER

CHROMA

&

VIDEO

AMP

I

.

C

'

r

I

'

H

.

&

V

CIRCUIT

*

R

.

AMP

CIRCUIT

i

R

.

G

.

B

OUTPUT

CIRCUIT

®

CRT

SWITCH

DRIVE

R

.

G

.

B

(

7

)

1

AMP

®

®

G

.

AMP

CIRCUIT

&

(

Y

)

@

®

*

B

.

AMP

CIRCUIT

AMP

.

©

I

.

C

©

TRANSFORMER

SWITCHING

RECT

*

i

*

§

IC

501

n

B

ADJ

*

IC

POWER

CONTROL

POWER

DRIVE

POWER

OUT

DR

L

POWER

TRANSF

AC

POWER

SOURCE

4

(

No

.

5741

)

TM

-

R

14

U

FUNCTIONS

FRONT

VIEW

(

Z

)

(

D

(

D

(

S

)

(

Q

)

®

©

@

©

©

@

©

©

®

INPUT

A

/

B

SELECT

BUTTON

*

When

exercising

remote

control

with

the

rear

remote

terminal

,

set

to

INPUT

A

.

®

SYNC

.

,

SELECT

(

INT

/

EXT

)

BUTTON

Switch

for

INT

-

SYNC

.

or

EXT

.

-

SYNC

.

Change

-

over

.

*

When

exercising

remote

control

with

the

rear

remote

terminal

,

set

to

I

NT

.

(

0

)

NOTCH

(

ON

/

OFF

)

BUTTON

ON

/

OFF

switch

for

NOTCH

circuit

functions

to

de

-

crease

dot

obstacles

on

the

top

and

button

outline

part

of

picture

.

This

switch

,

however

,

decreases

resolution

,

and

so

switch

OFF

if

unnecessary

.

@

COLOR

(

ON

/

OFF

)

BUTTON

Switch

for

color

screen

or

monochrome

screen

change

-

over

is

used

to

check

white

balance

or

adjustment

.

®

V

.

HOLD

CONTROL

KNOB

(

2

)

TINT

CONTROL

KNOB

(

3

)

COLOR

CONTROL

KNOB

(

4

)

BRIGHT

CONTROL

KNOB

(

5

)

CONTRAST

CONTROL

KNOB

(

D

APERTURE

CONTROL

KNOB

Turn

APERTURE

control

knob

that

the

picture

turns

soft

and

clear

.

(

7

)

~

(

Q

)

SUB

CONTROL

VR

The

standard

state

of

each

control

knob

can

be

preset

with

each

SUB

-

VRs

.

First

,

set

each

control

knob

to

the

click

position

.

Next

,

rotate

each

SUB

-

VRs

with

a

thin

screw

driver

and

adjust

it

to

obtain

the

most

suitable

state

.

(

7

)

SUB

-

TINT

CONTROL

VR

(

8

)

SUB

-

COLOR

CONTROL

VR

(

4

)

SUB

-

BRIGHT

CONTROL

VR

©

SUB

-

CONTRAST

CONTROL

VR

(

Q

)

SUB

-

APERTURE

CONTROL

VR

\

(

J

(

No

.

5741

)

5

TM

-

R

14

U

(

Q

)

DEGAUSS

BUTTON

Switch

for

degaussing

picture

tube

.

To

deguss

,

push

this

switch

for

ten

seconds

,

when

degaussing

over

again

,

push

it

at

intervals

'

of

ten

minutes

.

®

POWER

BUTTON

/

POWER

IND

.

Switch

for

power

of

this

set

.

Power

is

switched

ON

,

and

then

power

indicator

lamp

is

lighted

.

@

TALLY

LAMP

SWITCH

Lighting

by

internal

power

source

(

when

shipping

)

short

between

pin

(

2

)

and

pin

(

3

)

of

TALLY

terminal

.

Lighting

by

External

power

source

.

(

1

)

First

,

set

TALLY

switch

within

the

set

to

EXT

.

side

.

(

2

)

Give

DC

24

V

between

pin

(

T

)

and

pin

(

5

)

of

TALLY

terminal

.

#

BLUE

CHECK

BUTTON

Switch

for

ordinary

screen

or

blue

monochrome

screen

changeover

is

used

to

adjust

TINT

and

COLOR

easily

.

(

How

to

adjust

)

(

1

)

First

,

input

color

bar

signal

and

make

blue

mono

-

chrome

screen

.

(

2

)

Adjust

TINT

and

COLOR

control

knob

alter

-

nately

so

that

each

blue

band

is

same

in

density

and

brightness

;

and

then

TINT

and

COLOR

is

adjusted

correctly

.

@

SCAN

(

WIDE

/

NARR

)

BUTTON

Switch

for

overscan

screen

or

underscan

screen

change

-

over

is

used

to

check

screen

frame

or

screen

square

.

6

(

No

.

5741

)

TM

-

R

14

U

(

T

)

VIDEO

(

A

/

B

)

TERMINALS

&

75

£

2

SWITCH

The

Terminals

for

monitoring

by

connecting

the

video

output

from

a

video

camera

,

VCR

or

other

equipment

.

A

>

75

n

OPEN

When

the

bridge

output

is

NOT

required

.

To

obtain

the

bridge

output

See

:

—

Page

9

Fig

.

F

.

(

D

SYNC

.

TERMINALS

75

S

2

SWITCH

INPUT

terminal

(

?

)

:

Comp

.

sync

,

signal

or

Comp

,

video

signal

OUTPUT

terminal

:

Bridge

output

terminal

(

D

SKEW

SWITCH

Switch

for

the

changeover

in

the

fixed

number

during

AFC

of

horizontal

deflection

circuit

.

Compensates

skewed

display

of

the

upper

part

on

the

screen

,

caused

by

VCR

play

back

tape

deterioration

or

other

factors

.

<

D

)

(

7

)

REMOTE

/

TALLY

TERMINAL

This

terminal

performs

INPUT

/

COLOR

/

SCAN

/

SYNC

,

switch

changeover

and

controlling

turning

ON

/

OFF

of

TALLY

lamp

from

the

outside

.

d

)

AC

POWER

SOURCE

INLET

(

9

)

FOCUS

VR

(

0

)

SCREEN

VR

(

Q

)

ACC

SWITCH

ON

/

OFF

switch

for

ACC

circuit

.

This

switch

has

been

turned

ON

at

the

factory

(

ACC

circuit

functions

)

,

but

turn

this

switch

OFF

when

ACC

circuit

need

not

be

actuated

.

(

4

)

SET

UP

SWITCH

NORMAL

side

SET

UP

side

(

D

DECODE

/

RGB

SWITCH

DECODE

side

RGB

side

:

Normal

picture

:

A

horizontal

line

will

appear

.

:

Use

Input

A

or

B

terminals

:

Use

R

.

G

.

B

.

terminal

©

R

.

G

.

B

.

IN

/

OUT

TERMINAL

&

75

fi

SWITCH

To

INPUT

R

.

G

.

B

.

signal

,

input

sync

,

signal

into

sync

,

terminal

.

75

£

2

switch

changeover

*

75

£

2

side

:

For

inputting

only

in

INPUT

terminal

•

OPEN

side

:

For

taking

bridge

output

through

out

terminal

.

(

No

.

5741

)

7

TM

-

R

14

U

HOW

TO

REMOVE

FOR

SERVICE

REAR

PANEL

REMOVAL

Unscrew

the

sixteen

screws

@

shown

in

Fig

.

A

.

TOP

PANEL

REMOVAL

Unscrew

the

seven

screws

®

shown

in

Fig

.

B

after

re

-

moving

the

four

screws

at

the

top

of

the

rear

panel

.

FRONT

PANEL

REMOVAL

Unscrew

the

seven

screws

(

§

)

shown

in

Fig

.

B

.

FRONT

CONTROL

P

.

C

.

BOARD

REMOVAL

After

removing

the

front

panel

and

wire

clamp

.

Front

control

P

.

C

.

Board

can

be

drawn

forward

.

MAIN

CHASSIS

REMOVAL

1

.

Unscrew

the

two

screws

(

A

)

shown

in

Fig

.

C

.

2

.

Then

remove

the

anode

wire

and

other

wires

(

if

neces

-

sary

)

from

the

wire

clamp

.

3

.

Withdraw

the

chassis

backward

along

the

rail

.

*

When

conducting

a

check

with

power

supplied

,

be

sure

to

confirm

that

the

CRT

earth

wire

is

connected

to

the

CRT

socket

board

and

chassis

.

Fig

.

A

WIRE

CLAMPING

AND

TYING

BAND

1

.

Be

sure

to

clamp

the

wire

.

2

.

Never

remove

the

tying

band

used

for

wire

clamping

.

Should

it

be

removed

,

be

sure

to

reclamp

the

wire

in

its

original

position

.

(

Be

sure

to

use

insulating

material

.

)

Fig

.

B

Fig

.

C

8

(

No

.

5741

)

TM

-

R

14

U

SERVICE

ADJUSTMENT

PURITY

1

.

Display

a

monochrome

pattern

.

2

.

As

viewed

from

the

back

(

See

Fig

.

E

)

,

turn

the

magnet

lock

counter

-

clockwise

to

loosen

it

.

3

.

Turn

the

green

cutoff

VR

(

R

717

)

fully

clockwise

and

the

red

and

blue

cutoff

VRs

(

R

718

,

R

716

)

fully

counter

-

clockwise

.

(

Fig

.

F

)

Adjust

the

screen

VR

so

that

the

green

band

becomes

easy

to

see

.

4

.

Loosen

the

deflection

yoke

securing

screw

and

slide

the

yoke

fully

rearward

to

obtain

color

shading

in

the

green

band

.

5

.

Overlap

the

two

purity

magnet

tabs

and

set

them

to

12

o

'

clock

position

.

6

.

Open

and

close

the

two

purity

magnets

(

scissor

fashion

)

and

adjust

so

that

the

green

band

is

positioned

at

the

center

of

the

picture

.

If

green

band

is

not

obtained

,

adjust

for

uniform

overall

coloration

.

7

.

Slide

the

deflection

yoke

forward

and

adjust

its

position

so

that

the

green

color

completely

fills

the

picture

area

.

8

.

Confirm

that

uniform

overall

rasters

of

both

red

and

blue

single

color

can

also

be

obtained

in

the

same

manner

.

9

.

Secure

the

deflection

yoke

retaining

screw

moderately

so

that

the

deflection

yoke

does

not

move

back

and

forth

.

Fig

.

E

[

Rear

View

]

G

.

DRIVE

VR

l

r

in

R

.

DRIVE

VR

G

.

CUTOFF

VR

l

\

I

/

R

.

CUTOFF

VR

B

.

CUTOFF

VR

STATIC

CONVERGENCE

(

CENTER

)

1

.

Employ

a

crosshatch

pattern

and

adjust

the

brightness

so

that

the

image

is

clear

,

but

slightly

darkened

.

2

.

Turn

the

red

and

blue

cutoff

VRs

fully

clockwise

and

the

green

cutoff

VR

fully

counter

-

clockwise

(

Fig

.

F

)

.

Adjust

the

screen

VR

for

an

easily

seen

image

.

3

.

Adjust

convergence

roughly

in

the

corner

-

by

tilting

the

deflection

yoke

vertically

or

horizontally

.

4

.

Turn

the

two

4

pole

convergence

magnets

and

adjust

so

that

red

and

blue

become

overlapped

throughout

the

picture

area

to

yield

magenta

.

(

Fig

.

I

)

5

.

-

Turn

the

green

cutoff

VR

full

clockwise

and

adjust

the

two

6

pole

convergence

magnets

so

that

the

green

and

magenta

become

overlapped

throughout

the

picture

area

to

yield

white

.

(

Fig

.

H

)

6

.

Repeat

steps

4

and

5

.

CRT

SOCKET

PB

ASS

'

Y

Fig

.

F

Green

band

Center

Adjust

to

center

green

band

.

Fig

.

G

I

Green

—

l

i

Magenta

(

Fig

.

I

Fig

.

H

(

No

.

5741

)

9

TM

-

R

14

U

WHITE

BALANCE

[

FRONT

VIEW

]

1

.

Display

a

monochrome

pattern

.

2

.

Select

the

SET

UP

switch

from

normal

to

set

up

,

and

a

horizontal

line

will

appear

(

Fig

.

J

)

!

.

3

.

Turn

the

red

,

blue

and

green

cutoff

VRs

(

R

718

,

R

716

&

R

717

)

and

the

screen

VR

fully

counterclockwise

to

eliminate

luminance

.

4

.

Gradually

turn

the

screen

VR

clockwise

to

where

single

line

of

one

of

the

colors

appears

.

5

.

Turn

the

cutoff

VR

of

this

color

clockwise

about

10

degrees

.

6

.

Again

turn

the

screen

VR

so

that

this

color

appears

only

faintly

.

7

.

Adjust

the

other

cutoff

VRs

so

that

the

horizontal

line

becomes

white

.

8

.

Return

the

SET

UP

switch

from

set

up

to

normal

and

then

display

a

monochrome

pattern

.

9

.

With

a

dark

picture

,

perform

fine adjustment

to

obtain

optimum

white

balance

.

10

.

With

a

bright

picture

,

adjust

the

red

and

green

drive

VRs

for

optimum

white

balance

.

HORIZONTAL

LINE

w

/

\

-

,

VERTICAL

CENTER

(

identified

with

a

white

notch

)

Bring

the

horizontal

line

nearest

to

the

white

notches

shown

in

the

dotted

circles

.

Fig

.

J

HORIZONTAL

LINE

Set

the

rear

SET

UP

switch

from

NORMAL

side

to

SET

UP

side

.

B

1

VOLTAGE

Cut

off

the

picture

by

the

bright

control

and

sub

-

bright

VR

.

Measure

the

voltage

between

TP

-

91

of

the

main

P

.

C

.

Board

ass

'

y

and

TP

-

E

(

yfrr

)

.

Adjust

Bx

adjustment

VR

to

obtain

110

V

.

V

.

HEIGHT

&

V

.

CENTER

*

Inputting

cross

-

hatch

pattern

.

1

.

Set

the

SCAN

switch

to

WIDE

and

adjust

V

.

HEIGHT

VR

so

that

raster

becomes

95

%

of

viewable

picture

size

.

2

.

Adjust

V

.

LIN

.

VR

so

that

the

top

and

bottom

of

screen

become

symmetrical

.

3

.

Next

,

set

SCAN

switch

to

NARR

and

adjust

NARR

V

.

HEIGHT

VR

so

that

raster

is

on

the

inside

(

about

9

mm

from

top

and

bottom

respectively

)

of

the

end

of

view

-

able

picture

size

.

(

Fig

.

K

)

4

.

When

raster

position

is

not

located

correctly

,

adjust

V

.

CENTER

VR

to

the

optimum

vertical

picture

position

.

5

.

Repeat

items

1

~

3

.

•

The

tester

used

should

be

periodically

calibrated

at

20

kl

2

/

V

.

R

.

G

.

B

.

BRIGHT

&

R

.

G

.

B

.

CONTRAST

1

.

Display

a

R

.

G

.

B

.

signal

.

2

.

Set

the

contrast

control

and

bright

control

to

the

center

position

.

3

.

Adjust

the

sub

-

contrast

VR

&

sub

-

bright

VR

for

opti

-

mum

display

.

R

.

G

.

B

.

GAIN

1

.

Input

video

signals

(

rectangular

waves

or

sinusoidal

waves

)

of

1

Vp

-

p

(

set

75

£

2

switch

to

the

7512

side

)

into

the

R

(

red

)

terminal

among

the

R

.

G

.

B

.

INPUT

terminals

.

2

.

Connect

an

oscilloscope

to

the

TP

-

R

,

and

adjust

the

R

,

GAIN

VR

so

that

its

output

becomes

0.7

Vp

-

p

.

3

.

Similarly

adjust

the

G

(

green

)

and

B

(

blue

)

GAIN

VR

'

s

.

H

.

WIDTH

COIL

&

H

.

CENTER

1

.

Set

the

SCAN

switch

to

WIDE

and

adjust

WIDTH

coil

(

L

503

)

so

that

raster

become

95

%

of

viewable

picture

size

.

(

Fig

.

L

)

SUB

-

APERTURE

1

.

Set

the

aperture

control

to

the

center

position

.

2

.

Adjust

the

sub

-

aperture

VR

for

optimum

display

.

3

.

By

turning

the

APERTURE

KNOB

,

confirm

that

changes

occur

from

a

soft

screen

to

a

clear

screen

.

10

(

No

.

5741

)