Sony TRINITRON KV-J21MF1AK, TRINITRON KV-J21MF3, TRINITRON KV-J21MN1AK, TRINITRON KV-J21PF1 Service Manual

MODEL COMMANDER DEST. CHASSIS NO.

KV-J21MF1AK

RM-883 India SCC-K67K-A

KV-J21MF3

RM-883 India SCC-K76F-A

KV-J21MN1AK

RM-883 India SCC-K67L-A

KV-J21PF1

RM-883 India SCC-K67G-A

SERVICE MANUAL

MODEL COMMANDER DEST. CHASSIS NO.

CHASSIS

TRINITRON

®

COLOR TV

BG-1S (D)

– 2 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

SPECIFICATIONS

CAUTION

SHORT CIRCUIT THE ANODE OF THE PICTURE TUBE AND
THE ANODE CAP T O THE METAL CHASSIS, CRT SHIELD, OR
CARBON PAINTED ON THE CRT, AFTER REMOVING THE
ANODE.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY SHADING AND MARK ! ON
THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE
PARTS LIST ARE CRITICAL T O SAFE OPERATION. REPLACE
THESE COMPONENTS WITH SONY PARTS WHOSE PART
NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUP­PLEMENTS PUBLISHED BY SONY.

Note
Power requirements 110-240 V AC, 50/60 Hz
Power consumption (W) Indicated on the rear of the TV
Television system B/G, I, D/K, M Except for KV-J21PF1

B/G KV-J21PF1

Color system PAL, PAL 60, SECAM, NTSC4.43, NTSC3.58 Except for KV-J21PF1

PAL, PAL 60,NTSC4.43, NTSC3.58 (AV IN) KV-J21PF1

Stereo system NICAM Stereo B/G, I; A2 Stereo (German) B/G KV-J21MN1AK only
Channel coverage

B/G VHF: E2 to E12/UHF: E21 to E69/CATV: S01 to S03, S1 to S41
I UHF: B21 to B68/CATV: S01 to S03, S1 to S41 Except for KV-J21PF1
D/K VHF: C1 to C12, R1 to R12/UHF: C13 to C57, R21 to R60/

CATV: S01 to S03, S1 to S41, Z1 to Z39 Except for KV-J21PF1

M VHF: A2 to A13/UHF: A14 to A79/

CATV: A-8 to A-2, A to W+ 4, W+ 6 to W+ 84 Except for KV-J21PF1

Audio output (speaker) 3W + 3W KV-J21MF3/J21PF1

3W + 3W + 7W (3D WOOFER) KV-J21MF1AK/J21MN1AK

Inputs Antenna: 75 ohms

VIDEO IN jacks: phono jacks

Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms, high impedance

Outputs Headphone jack: minijack

MONITOR OUT jacks: phono jacks

Video: 1 Vp-p, 75 ohms
Audio: 500 mVrms

Picture tube 21 in.

Tube size (cm) 54 Measured diagonally
Screen size (cm) 51 Measured diagonally

Dimensions (w/h/d, mm) 610 × 470 × 488 KV-J21MF3/J21PF1

610 × 510 × 488 KV-J21MF1AK/J21MN1AK

Mass (kg) 23 KV-J21MF3/J21PF1

25 KV-J21MF1AK/J21MN1AK

Design and specifications are subject to change without notice.

– 3 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

TABLE OF CONTENTS

1. GENERAL.................................................................... 4

2. DISASSEMBLY

2-1. Rear Cover Removal............................................ 11

2-2. A Board Removal ................................................ 11

2-3. Service Position ................................................... 11

2-4. Replacement of Parts ........................................... 12

2-5. Demagnetization Coil Removal .......................... 12

2-6. Picture Tube Removal.......................................... 13

3. SET-UP ADJUSTMENTS

3-1. Beam Landing ...................................................... 14

3-2. Convergence......................................................... 15

3-3. Focus Adjustment ................................................ 17

3-4. G2 (Screen) and White Balance Adjustments..... 17

4. SELF DIAGNOSIS FUNCTION............................ 18

5. CIRCUIT ADJUSTMENTS

5-1. Adjustments with Commander ............................ 19

5-2. Adjustment Method ............................................. 20

5-3. A Board Adjustment after IC003 (Memory)

Replacement......................................................... 25

5-4. Picture Distortion Adjustment ............................. 25

6. DIAGRAMS

6-1. Block Diagram ...................................................... 27

6-2. Circuit Boards Location ....................................... 31

6-3. Schematic Diagrams and Printed Wiring Boards. 31

(1) Schematic Diagrams of A3, C and K1 Boards..... 35

(2) Schematic Diagram of A Board............................ 43

(3) Schematic Diagrams of A11, A12, K and

VM Boards............................................................ 48

6-4. Semiconductors..................................................... 57

7. EXPLODED VIEW

7-1. Chassis .................................................................. 59

7-2. 3D Speaker (KV-J21MF1AK/J21MN1AK only) 61

8. ELECTRICAL PARTS LIST.................................... 62

Section Title Page Section Title Page

– 4 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

SECTION 1

GENERAL

The operating instructions mentioned here are partial abstracts from the
Operating Instructions Manual. The page numbers of the Operating
Instruction Manual remain as in this manual.

2

3

p KV-J21MF1AK/J21MN1AK

B/G I D/K M

TV SYSTEM

AUTO PROGR

TV SYSTEM

AUTO PROGR

p KV-J21MF1AK/J21MN1AK/

J21MF3

2

1

– 5 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Getting Started

5

Connecting audio/video equipment using MONITOR OUT jacks

When using the video input jacks

Do not connect video equipment to the video input jacks at the front and the rear of your TV simultaneously; otherwise the picture will
not be displayed properly on the screen.

to antenna
output

or

MONITOR OUT

Rear of TV

When recording through the MONITOR OUT jacks

If you change the channel or video input while recording with a VCR, the channel or video input you are recording also will be changed.

to antenna socket

Audio system

Connecting optional equipment

You can connect optional audio/video equipment to your TV such as a VCR, multi disc player, camcorder, video
game or stereo system.

Connecting video equipment using video input jacks

VIDEO IN

Rear of TV

Front of TV

VIDEO

L

(

MONO

)

VIDEO INPUT

AUDIO

R

VIDEO

IN

MONITOR

OUT

VIDEO

L

(

MONO

)

AUDIO

R

to video
and audio
outputs

: Signal flow

: Signal flow

to video and
audio outputs

Camcorder

to antenna
output

VCR

to antenna socket

VIDEO

IN

MONITOR

OUT

VIDEO

L

(

MONO

)

AUDIO

R

: Signal flow

to video
and audio
inputs

VCR

Getting Started

4

Connections

Connecting a VHF antenna or a combination VHF/UHF antenna
— 75-ohm coaxial cable (round)

Attach an optional IEC antenna connector to the 75-ohm coaxial cable.
Plug the connector into the

(antenna) socket at the rear of the TV.

Getting Started

Connecting the 3D WOOFER

p KV-J21MF1AK/J21MN1AK only

1

Attach the 3D WOOFER into the foothold on the top of the TV.

2

Connect the wires to the 3D WOOFER (8Ω) terminals at the rear of the TV.

The red wire should be connected to the ‘ red terminal and the black wire to the ’ black terminal.

Notes

• Connect only the supplied 3D WOOFER; otherwise the TV may malfunction.

• Unplug the TV from the wall outlet when connecting the 3D WOOFER.

• To prevent a malfunction caused by a short circuit of the terminals, make sure that none of the 3D WOOFER wire strands stick out,
making contact with the neighbouring speaker terminal.

1

2

3D WOOFER

Black wire

Red wire

On a wall

or

Rear of TV

Rear of TV

– 6 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Getting Started

6

Presetting channels

Presetting channels manually using the
buttons on the TV

1

Press MANUAL PROGR.

2

Press PROGR +/– on the remote commander
until the required program position
appears on the screen.

3

Press TV SYSTEM until your local TV system
appears (KV-J21MF1AK/J21MN1AK/J21MF3
only).

4

Press VOLUME +/– until the required channel
picture appears on the screen.

5

Press MANUAL PROGR.

If the TV system is not properly selected
(KV-J21MF1AK/J21MN1AK/J21MF3 only)

The color of the picture may be poor and/or the sound
may be noisy. In this case, select the appropriate TV
system.

1 Press PROGR +/– on the remote commander to

select the program position.

2 Press TV SYSTEM until the picture and sound

become normal.

Notes (KV-J21MF1AK/J21MN1AK/J21MF3 only)

• If you do not know your local TV system, consult your nearest

authorized service center or dealer.

• The setting of the TV SYSTEM is memorized for each program

position.

Disabling program positions using the
buttons on the TV

By disabling unused or unwanted program positions,
you can skip those positions when you press
PROGR +/– on the remote commander.

1

Press PROGR +/– on the remote commander
until the unused or unwanted program
position appears on the screen.

2

Press MANUAL PROGR.

3

Press PIC MODE on the remote commander.

4

Press MANUAL PROGR.

To cancel the skip setting

Preset the channel manually or automatically again.

You can preset up to 100 TV channels in numerical
sequence from program position 1 automatically.

To change the channel for a particular program
position or to receive a channel with a weak signal,
you can preset the channel manually. You can also
disable program position.

You can preset TV channels using the buttons on the
TV or the remote commander.

Presetting channels automatically
using the buttons on the TV

Front of TV

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

Press TV SYSTEM until your local TV system
appears

(KV-J21MF1AK/J21MN1AK/J21MF3 only)

3

Press AUTO PROGR.

To start presetting channels automatically
from the specified program position
1 Press MANUAL PROGR.
2 Press TV SYSTEM to select your local TV system

(KV-J21MF1AK/J21MN1AK/J21MF3 only).

3 Press PROGR +/– to select the program position.
4 Press AUTO PROGR.

2

3

1

TV SYSTEM

B/G I D/K

M

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

POWER

AUTO PROGR

1 2 3

1

POWER

Getting Started

7

POWER

B/G I D/K M

Presetting channels automatically
using the remote commander

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

Press SELECT until “TV SYSTEM” appears
(KV-J21MF1AK/J21MN1AK/J21MF3 only).

3

Press + or – to select your local TV system
(KV-J21MF1AK/J21MN1AK/J21MF3 only).

4

Press SELECT until “AUTO PROGRAM”
appears.

5

Press + or – .

6

Press + or – .

Presetting channels manually using the
remote commander

1

Press SELECT until “TV SYSTEM” appears
(KV-J21MF1AK/J21MN1AK/J21MF3 only).

2

Press + or – to select your local TV system
(KV-J21MF1AK/J21MN1AK/J21MF3 only).

3

Press PROGR +/– or a number button until
the required program appears on the
screen.

4

Press SELECT until “MANUAL PROGRAM”
appears.

5

Press + or – .

6

Press + or – .

The selected channel appears on the screen.

7

Press SELECT to return to normal screen.

SELECT

TV SYSTEM : B/G

SELECT

TV SYSTEM : B/G

B/G I D/K M

or

1

2

3

4

6

7

8

9

÷

0

5

PROGR

JUMP

SELECT

MANUAL PROGRAM

1 2 3

1

VHF LOW B/G

SELECT

AUTO PROGRAM

VHF LOW B/G

1

SELECT

+ or –

SELECT

– 7 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Getting Started

8

If you are not satisfied with the picture
and sound quality

You may be able to further improve the picture and
sound quality by using fine tuning as below:

1

Select the program position you want to
adjust.

2

Press SELECT until “MANUAL PROGRAM”
appears on the screen.

3

Press + or – on the remote commander
once.

4

Press DISP until “FINE” appears on the
screen.

5

Press + or – continuously until you are
satisfied with the picture and sound
quality.

6

Press SELECT to return to normal screen.

9

Operations

VIDEO
HOLD

1

2

3

4

6

7

8

9

÷

0

5

JUMP

Watching the TV

1

Press POWER to turn on the TV.

When the TV is turned on in standby mode, press
POWER on the remote commander.

2

Select the TV program you want to watch.

To select a program position directly

Press the number button.

To select a two-digit program position, press “-/--”
before pressing the number buttons.
For example: to select program position 25, press
“-/--,” and then “2” and “5.”

To scan through program positions

Press PROGR +/– until the program position you
want appears.

3

Press VOL +/– to adjust the volume.

Turning off the TV

To turn off the TV temporarily

Press POWER on the remote commander. The
STANDBY indicator on the TV lights up.

To turn off the TV completely

Press POWER on the TV.

If the power on the TV is turned off in standby mode,
the STANDBY indicator on the TV may remain alight for
a while.

Watching the video input

Press VIDEO/HOLD.

To watch TV

Press TV.

Switching back quickly to the previous
channel

Press JUMP.

Muting the sound

Press MUTING.

÷

2 5

PROGR

Operations

VIDEO

1

POWER

JUMP

POWER

VOL

POWER

MUTING

MUTING

TV

– 8 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Operations

10

DISP

REVEAL

Setting the Sleep Timer

You can set the TV to automatically turn off as you
have programmed.

Press SLEEP/TEXT CLR.

To cancel the Sleep Timer, press SLEEP/TEXT CLR
repeatedly until “SLEEP TIMER: OFF” appears, or turn
off the TV.

Changing the on-screen display
language

You can use buttons on the remote commander or the
TV to change the on-screen display language.

1

Press SELECT until the screen appears as
follows:

2

Press + or – to select “

” or “ ”.

Note

• You can also use SELECT and VOLUME +/– on the TV to

select the on-screen display language.

• The last TV program position or video input just before the TV

turns into standby mode will appear when the TV is turned on
using the Wake Up Timer.

• If no buttons or controls are pressed for more than two hours

after the TV is turned on using the Wake Up Timer, the TV
automatically turns into standby mode. If you want to
continue watching the TV, press any button or control on the
remote commander or the TV.

1

AUTO B/G
DYNAMIC MUSIC

Displaying on-screen information

Press DISP/REVEAL.

The program position, local system, and TV settings are
displayed on the screen.

No sleep timer

After 90 minutes

After 60 minutes

After 30 minutes

SELECT

LANGUAGE

/

: ENGLISH

LANGUAGE /

: ENGLISH

or

(KV-J21MN1AK)

(KV-J21MN1AK)

(KV-J21MF1AK/J21PF1/
J21MF3)

(KV-J21MF1AK/J21PF1/
J21MF3)

/

LANGUAGE

:

or

: LANGUAGE /

SLEEP TIMER:30M SLEEP TIMER:60M

SLEEP TIMER:OFF

SLEEP TIMER:90M

Setting the Wake Up Timer

You can set the TV to automatically turn on as you have
programmed.

1

Press WAKE UP/INDEX repeatedly to set the
timer.

The on-screen display appears and the WAKE UP
indicator on the TV lights up.

2

If you want a particular TV program or
video input to be displayed using the Wake
Up Timer, select the TV program or video
input.

3

Press POWER on the remote commander or
set the Sleep Timer to turn off the TV in
standby mode.

To cancel the Wake Up Timer, press WAKE UP/INDEX
repeatedly until “WAKE UP TIMER: OFF” appears, or
turn off the main power of the TV.

Notes

• The Wake Up Timer starts immediately after the on-screen
display disappears.

SLEEP

TEXT CLR

WAKE UP

INDEX

After 10 minutes

WAKE UP TIMER:10M

WAKE UP TIMER:OFF

WAKE UP TIMER:12H00M

No wake up timer

After 12 hours

+ or –
SELECT

11

Operations

Using the Child Lock
feature

Watching the picture
in wide mode

You can prevent a child from watching certain program
positions by using the buttons on the remote
commander.

1

Select the TV program you want to lock.

2

Press SELECT until “CHILD LOCK” appears
on the screen.

3

Press + or – until “LOCKED” appears on the
screen.

Notes

• To unlock the program position, repeat steps 1 to 3 as above
until “LOCKED” disappears from the screen.

• To prevent your child from unlocking the program position,
keep the remote commander away from your child.

÷

0

+ or –
SELECT

SELECT

CHILD LOCK

LOCKED

You can adjust the display mode accordingly to fit the
programs to your TV screen size.

Press WIDE/V-ZOOM repeatedly until the wide
display mode you want appears on the screen.

TV

WIDE/

V-ZOOM

Good-bye,Jane
Good-bye.

Good-bye,Jane
Good-bye.

WIDE

V-ZOOM

NORMAL

Normal display
mode “WIDE” mode

“V-ZOOM” mode

– 9 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Operations

12

Adjusting the
picture

Adjusting the sound and picture settings

1

Press SELECT until the item you want to
adjust appears.

Each time you press SELECT, the screen changes
as follows:

2

Press + or – to adjust the item.

3

To adjust other items, repeat steps 1 and 2.

Notes

• You can also use SELECT and VOLUME +/– on the TV to

adjust the sound and picture settings.

• SURROUND is only applicable to a stereo signal. When

receiving a monaural signal, please turn off SURROUND for
the best sound.

If the picture color is abnormal when receiving
programs through the ˘ (antenna) terminal

Change the “TV SYSTEM” (for KV-J21MF1AK/J21MN1AK/
J21MF3 only) or “COLOR SYSTEM” setting or adjust the “COLOR”
level in the on-screen display until the color becomes normal.

If the picture color is abnormal when receiving
programs through the video input jack

Change the “COLOR SYSTEM” setting or adjust the “COLOR”
level in the on-screen display until the color becomes normal.

Note

• Normally set “COLOR SYSTEM” to “AUTO”.

If the sound is distorted or noisy when receiving
programs through the ˘ (antenna) terminal

Change the “TV SYSTEM” setting (for KV-J21MF1AK/
J21MN1AK/J21MF3 only) in the on-screen display until the
sound becomes clear.

Adjusting the sound
and picture

÷

0

SOUND

MODE

SELECT
PIC MODE

Selecting the sound mode

Press SOUND MODE until the mode you want
appears.

Each time you press SOUND MODE, the screen
changes as follows:

Selecting the picture mode

Press PIC MODE until the mode you want
appears.

Each time you press PIC MODE, the screen changes as
follows:

Note

• If you change the picture and sound mode after the following
adjustments, the adjustment changes in accordance with the
picture and sound mode.

MUSIC

DRAMA SPORTS

SOFT

Emphasize
low and high
sound effect

Emphasize
huge
audience
atmosphere

Emphasize
vocals and
background
music

Emphasize
soft sound

Front of TV

SOUND

MODE

High contrast
picture

DYNAMIC

STANDARDSOFT

Normal
picture

PIC MODE

Soft picture

PICTURE

COLOR BRIGHT

HUE

SHARPNESS

BASS

BALANCE

SURROUND

TREBLE

SELECT

MANUAL PROGR

COLOR SYSTEM

SELECT

TV SYSTEM

AUTO PROGR

+ or –

(Operative for
NTSC signal only)

13

Operations

A/B

ENLARGE

Selecting a stereo or
bilingual program

p KV-J21MN1AK only

Press A/B/ENLARGE repeatedly until you
receive the sound you want.

The on-screen display changes corresponding to the
selected sound and the WAKE UP/STEREO indicator
also lights up.

When receiving a NICAM program

Broadcasting

NICAM stereo

NICAM bilingual

NICAM monaural

When receiving an A2 (German) program

Broadcasting

A2 (German)
stereo

A2 (German)
bilingual

Notes

• If the signal is very weak, the sound becomes monaural

automatically.

• If the stereo sound is noisy when receiving a NICAM program,

select “MONO”. The sound becomes monaural, however, the
noise will be reduced.

If the sound is distorted or noisy when
receiving a monaural program through the

˘

(antenna) terminal

Press A/B/ENLARGE repeatedly until “MONO”
appears on the screen.

To cancel the monaural sound setting, press
A/B/ENLARGE again until “AUTO” appears on the
screen.

Notes

• The “MONO” or “AUTO” setting is memorized for each

program position.

• You cannot receive stereo signal when the TV is in the

“MONO” setting.

On-screen display

(Selected sound)

NICAM

z(Stereo sound)

MONO

z (Regular sound)

NICAM

z MAIN

(Main sound)

NICAM

z SUB

(Sub sound)

NICAM

z MAIN

(Main sound)

MONO

z (Regular sound)

MONO

z (Regular

sound)

On-screen display
(Selected sound)

STEREO

(Stereo sound)

z MAIN

(Main sound)

z SUB

(Sub sound)

z MONO

z AUTO

– 10 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

Additional Information

14

Troubleshooting

Additional Information

If you have any problems, read this manual again and
check the countermeasure for each of the symptoms
listed below.
If the problem persists, contact your nearest authorized
service center or dealer.

Snowy picture
Noisy sound

/Check the antenna.
/Check the antenna connection on the TV

and on the wall.

/Check the TV SYSTEM setting

(KV-J21MF1AK/J21MN1AK/J21MF3 only).

Dotted lines or stripes

/This may be caused by local interference

(e.g. cars, neon signs and hair dryers). Adjust
the antenna for minimum interference.

Double images or “ghosts”

/This may be caused by reflections from

nearby mountains or buildings. A highly
directional antenna may improve the picture.

No picture
No sound

/Press POWER.
/Check the antenna connection.
/Check the VCR connections.
/Check the power cord connection.
/Check the standby mode.

Good picture
Noisy sound

/Check the TV SYSTEM setting (KV-

J21MF1AK/J21MN1AK/J21MF3 only).

/Reduce the TREBLE level or select the

“SOFT” sound mode.

Good picture
No sound

/Press VOLUME +.
/Press MUTING.
/Press A/B/ENLARGE

(KV-J21MN1AK).

No color

/Adjust the COLOR level in the on-screen

display.

/Check the COLOR SYSTEM setting.

TV cannot receive stereo signal

/Press A/B/ENLARGE until “AUTO”

appears

on the screen (KV-J21MN1AK).

TV cabinet creaks

/Even if the picture or the sound is normal,

changes in the room temperature
sometimes make the TV cabinet expand or
contract, making a noise. This does not
indicate a malfunction.

Note on the remote commander

• The supplied remote commander is used on several models of

the TV. If you do not find instructions for some controls that
are on the remote commander, that means your TV does not
employ the features of those controls, e.g. TEXT.

Note on the TV SYSTEM button

• The TV SYSTEM button is not used on your TV (KV-J21PF1

only).

Notes

• When you switch on the TV, you may hear the “boon” sound

that is caused by the demagnetization of the TV. This does not
indicate a malfunction.

• The picture color may become abnormal if you change the

direction of your TV. To obtain the normal picture color, press
POWER on the TV to switch off the TV for five minutes and
then switch it on again.

WARNING

Do not install the appliance in a confined space, such as
a bookcase or built-in cabinet.

– 11 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

2-1. REAR COVER REMOVAL

2-2. A BOARD REMOVAL

2-3. SERVICE POSITION

SECTION 2

DISASSEMBLY

A board

Lever

Lever

A board

2

Two screws

(BVTP 4×16)

3

One screw

(BVTP 3×16)

1

Two screws
(BVTP 4×16)

– 12 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

2-4. REPLACEMENT OF PARTS

For replacement of the Multi Button, Power Button and Light Guide, cut the welded portions
from them, exchange with the new parts, and fix them with screws (+BVTP) respectively.

2-4-1. REPLACEMENT OF MULTI BUTTON

2-4-2. REPLACEMENT OF LIGHT GUIDE

2-5. DEMAGNETIZATION COIL REMOVAL

1

Demagnetization coil

2

Tension spring

Picture tube

Cut

Multi button

Two screws
(BVTP 3×12)

Light guide

Cut

One screw
(BVTP 3×12)

– 13 –

KV-J21MF1AK/J21MF3

KV-J21MN1AK/J21PF1

RM-883

2-6. PICTURE TUBE REMOVAL

2 Using a thumb press down, then pull up the rubber cap firmly in the direction

indicated by the arrow b.

3 When one side of the rubber cap is separated from the anode button, the anode-

cap can be removed by turning up the rubber cap and pulling it up in the direc­tion of the arrow c.

• HOW TO HANDLE AN ANODE-CAP

1 Do not damage the surface of anode-cap with sharp shaped objects.
2 Do not press the rubber too hard so as not to damage the inside of anode-cap.

A metal fitting called the shatter-hook terminal is built into the rubber.

3 Do not turn the foot of rubber over too hard.

The shatter-hook terminal will stick out or damage the rubber.

•REMOVAL OF ANODE-CAP

NOTE : After removing the anode, short circuit the anode of the picture tube and the an-

ode cap to the metal chassis, CRT shield or carbon paint on the CRT.

•REMOVING PROCEDURES

1 Turn up one side of the rubber cap in the direction indicated by the arrow a.

2 A board

3 C board

4 Deflection yoke

Cushion

5 Four screws
(Tapping screws)

1 Anode cap

6 VM board

(Except for KV-J21PF1)

a

a

b

b

c

Anode button

– 14 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

• The following adjustments should be made when a complete

realignment is required or a new picture tube is installed.

• These adjustments should be performed with rated power

supply voltage unless otherwise noted.

Controls and switch should be set as follows unless otherwise noted:

PICTURE control........................................................... normal

BRIGHTNESS control................................................... normal

Perform the adjustments in the following order:

1. Beam Landing

2. Convergence

3. Focus

4. White Balance

Note : Test Equipment Required:

1. Color-bar/Pattern Generator

2. Degausser

3. Oscilloscope

SECTION 3

SET-UP ADJUSTMENTS

.................................................................................................................................................................................................................................

Fig. 3-4

Fig. 3-3

GREEN

BLUE RED

Fig. 3-2

Purity control

}

normal

Preparation :

• In order to reduce the influence of geomagnetism on the set's

picture tube, face it east or west.

• Switch on the power and degauss with the degausser.

3-1. BEAM LANDING

1. Input a white signal with the pattern generator.
Contrast
Brightness

2. Position neck assy as shown in Figure 3-1. (Except for KV­J21PF1)

3. Set the pattern generator raster signal to green.

4. Move the deflection yoke to the rear and adjust with the purity
control so that the green is at the center and the blue and the red
take up equally sized areas on each side.
(See Figures 3-1 through 3-3.)

5. Move the deflection yoke forward and adjust so that entire
screen is green. (See Figure 3-1.)

6. Switch the raster signal to blue, then to red and verify the
condition.

7. When the position of the deflection yoke has been decided,
fasten the deflection yoke with the screws.

8. If the beam does not land correctly in all the corners, use a
magnet to adjust it. (See Figure 3-4.)

Deflection yoke positioning
corrects these areas.

Purity control corrects
this area.

Disk magnets or rotatable
disk magnets correct
these areas (a-d).

b

c

a

d

ba

c

d

Neck assy

G1 G2 G3

Fig. 3-1

– 15 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

3-2. CONVERGENCE

Preparation :

• Before starting this adjustment, adjust the focus, horizontal size,

and vertical size.

• Minimize the brightness setting.

• Provide dot pattern.

(1) Horizontal and Vertical Static Convergence

1. (Moving vertically), adjust the V.STAT magnet so that the red,
green and blue dots are on top of each other at the center of the
screen.

2. (Moving horizontally), adjust the H.STAT VR so that the red,
green and blue dots are on top of each other at the center of the
screen.

• Operation of V.STAT magnet.

If the V.STAT magnet is moved in the direction of the a and
b arrows, the red, green and blue dots move as shown below.

B

R

B

R

ab

bb

a

b

a

b

a

R

G

B

b

B

G

R

b

b

a

a

1

2

3

GG

B G R

R G B

R G B

G

R

B

Center dot

V.STAT Magnet

C board

RV 701

SCREEN (G2)

V.STAT

Purity

• Operation of BMC (Hexapole) magnet.

If the blue or red dot does not conver ge with the other two dots,
perform following steps.
Move BMC magnet (a) to correct insufficient H.static
convergence.
Rotate BMC magnet (b) to correct insufficient V.static
convergence.
In either case, repeat Beam Landing Adjustment.

a

BMC magnet

b

– 16 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

3. Move the deflection yoke as shown in the figure below and
optimize the convergence.

4. Tighten the deflection yoke screws.

5. Install the deflection yoke spacer.

(3) Screen-corner Convergence

a-d : screen-corner
misconvergence

b

a

c

d

(2) Dynamic Convergence Adjustment
Preparation :

• Before starting this adjustment, adjust the horizontal static

convergence and the vertical static convergence.

1. Slightly loosen the deflection yoke screws.

2. Remove the deflection yoke spacer.

B G R

B
G
R

R
G
B

R G B

R G B

R
G
B

B
G
R

B G R

R G BB G R

B G RR G B

a

d

c

b

Fix a Permalloy assy
corresponding to the
misconverged areas

Permalloy assembly

– 17 –

KV-J21MF1AK/J21MF3
KV-J21MN1AK/J21PF1

RM-883

3-3. FOCUS ADJUSTMENT

Adjust FOCUS control on the flyback transformer for the best
focus.

Note: Screen VR is not use.

a. AN ITEM OF ADJUSTMENT

b. METHOD OF CANCELLATION FROM SERVICE

MODE

Set the standby condition (Press POWER button on the
commander) and then press POWER button again, hereupon it
becomes TV mode.

c. METHOD OF WRITE FOR MEMORY

1) Set to Service Mode.

2) Press 1 (UP) and 4 (DOWN) to select an item of adjust­ments.

3) Press MUTING button and it will indicate WRITE on screen.

4) Press - button to write into memory.

d. MEMORY WRITE CONFIRMATION METHOD

1) After adjustment, pull out the plug from AC outlet, and then
plug into AC outlet again.

2) Turn the power switch ON and set to Service Mode.

3) Call the adjusted items again, confirm they were adjusted.

NoteInitial DATA

09 RDR 28 WHITE POINT R

0A GDR 20 WHITE POINT G
0B BDR 20 WHITE POINT B

3-4. G2 (SCREEN) AND WHITE BALANCE

ADJUSTMENTS

1. G2 (SCREEN) ADJUSTMENT (RV701)

1) Set the PICTURE and BRIGHTNESS to normal.

2) Put to VIDEO input mode without signals.

3) Connect R, G and B of the C board cathode to the oscilloscope.

4) Adjust G2 (RV701) volume to the value below.

2. WHITE BALANCE ADJUSTMENTS

1) Set to Service Mode.

2) Input an entire white signal.

3) Set the PICTURE to maximum.

4) Select RDR(09) with 1 and 4 , and then set the level to 28
with 3 and 6 .

5) Select GDR(0A) and BDR(0B) with 1 and 4 and adjust
the level with 3 and 6 for the best white balance.

6) Write into the memory by pressing MUTING , then - .

SERVICE

MUTING

1 F

DATA

RDR

Adjustment Item

09

Item number

WRITE1 FRDR09

0

Executes the writing

Item
number

Adjustment
item

FOCUS

SCREEN
(NOT USED)

0 V

177 ± 2 V DC