Sharp 21N52E1 Schematic

SHARP

SERVICE MANUAL

S90M621 N52E11

21 SYSTEM

COLOUR TELEVISION

Chassis No. 2IA- M

MODEL

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.

21N52-E1

ELECTRICAL SPECIFICATIONS

Power Input
Power Consumption

Convergence

......

Focus
Sweep Deflection

Intermediate Frequencies

Picture IF Carrier
Sound IF Carrier

6.5MHz .........................................

6.0MHz .........................................

5.5MHz .........................................

4.5MHz .........................................

Colour Sub-Carrier

PAL/NTSC
SECAM

NTSC
Audio Power Output Rating
Speaker

Size .............................

Voice Coil Impedance

................................ 110-240VAC

50/60Hz (Auto)

................................. 107w

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

Bi-Potential, Uni-Potential Electrostatic

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

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

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

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

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

Self Converging System

Magnetic

38.9M Hz

32.4MHz

. 32.9MHz
.

33.4MHz
.

34.4MHz

34.47M Hz

34.494/34.65MHz

35.32MHz

2.5W x 2 (Max.)

........

.

8cm x 4cm Oval x 2 pcs

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

8 ohms at 400 Hz

Specifications are subject to change without prior

notice.

Aerial Input Impedance ,......, 75 ohm Unbalanced

Receiving Channels

PAL-B/G, SECAM-B/G

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

VHF

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

UHF

.......................,...............

CATV

PAL-D/K, SECAM-D/K

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

VHF

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

UHF

PAL-l

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

VHF

UHF ..................

NTSC-M

VHF

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

UHF

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

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

CATV

Receiving Frequency

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

VHF

UHF . . . . . . . . . . . . . . . . . . . . . . . . .

(IRELAND):

(U.K., H.K.): 21 thru 69

(US):

(JAPAN):

(US): 14 thru 83

(JAPAN): 13 thru 62

48.25 thru 301.25 MHz

471.25 thru 885.25 MHz

E2 thru
21 thru 69
S1 thru S3,

M1 thru M10

U1 thru U10

R1 thru
21 thru 69

B thru J

2 thru 13

1 thru 12

A-6 thru A-1,

A thru W,

El2

R12

AA

WARNING

The chassis in this receiver is partially hot. Use an isolation transformer between the line cord plug and

power receptacle, when servicing this chassis.
To prevent electric shock, do not remove cover. No user ­qualified service personnel.

serviceable parts inside. Refer servicing to

SHARP CORPORATION

CONTENTS

h

Page

15

20

1

2

3

l

PRINTED WIRING BOARD ASSEMBLIES

l

SCHEMATIC DIAGRAMS

AND WAVEFORMS

@BLOCK

.

DIAGRAM

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

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

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

l

ELECTRICAL SPECIFICATIONS

l

IMPORTANT SERVICE NOTES

l SERVICE ADJUSTMENT

@TROUBLE

@CHASSIS

SHOOTING TABLE

LAYOUT DIAGRAM

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

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

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

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

........................ REPLACEMENT PARTS LIST

IMPORTANT SERVICE NOTES

Maintenance and

service personnel on

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

When servicing the high voltage system,

connecting a 10 kohm Resistor in series with an insulated wire (such as a test
probe) between picture tube

disconnected from AC outlet.)

1.

Picture tube in this receiver employs integral implosion protection.
Replace with tube of the same type number for continued safety.

2.
Do not lift picture tube by the neck.

3.
Handle the picture tube only when wearing shatterproof goggles and after discharging the

4.
high voltage completely.

re

air of this receiver should be done by qualified

r

y.

remove static charge from it by

dag

and

2nd

anode lead. (AC line cord should be

........

Page

21

26

.

33
37

X-RAY

This receiver is designed so that any X-Ray radiation is kept to an absolute

minimum.

Since certain malfunctions or servicing may produce potentially
hazardous radiation with prolonged exposure at close range, the following
precautions should be observed:

When repairing the circuit, be sure not to increase the high voltage to more than 27.3kV, (at

1.

cut-off) for the set.
To keep the set in a normal operation, be sure to make it function on

2.

1 .I

mA)

in the case of the set.

The set has been factory

.I

If there is a possibility that the high voltage fluctuates as a result of the repairs, never
forget to check for such high voltage after the work,

DO not substitute a picture tube with unauthorized types and/or brands which may cause

3.

excess X-ray radiation.

-Adjusted to the above-mentioned high voltage.

25.3kV + 15kV

(at beam

BEFORE RETURNING THE RECEIVER

Before returning the receiver to the user, perform the

1. Inspect all

lodged between the chassis and other metal parts in the receiver.

2. Inspect all protective devices such as non-metallic control knobs, insulating fishpapers,

cabinet backs, adjustment and compartment covers or shields, isolation resistor-capacity

networks, mechanical insulators etc.

lead dress to make certain that leads are not pinched or that hardware is not

following

safety

checks.

2

SERVICE ADJUSTMENT

PIF/AFT/SIF/AGC

TUNER
The tuner has been factory preset (no

adjustment is needed).

1.

2.

* NOTE:

3.

4.

To
test

IFT

COILS

Set Vr voltage at 5V in VH band.
Connect sweep generator’s output to the test
point of tuner, by using a

I

Connection Diagram of

The sweep generator’s probe should be
grounded closely to the tuner test point.

Output level of sweep generator: 80
Connect response lead (low impedance probe

with detector) to the collector of
unit).

1

OOOpF

4-l

A

lN60

I ? U- ;:

7552

DC cut probe.

w

75G

DC Cut

To

*

Probe.

dB

Q1201

(in IF

osci I loscope

ADJUSTMENT

5.

PIF AGC:

Apply DC

6.

RF

AGC:

Apply DC

AGC

7.

Connect

4203

8.

Adjust the tuner IF coils to obtain the
waveform as shown figure below.

NOTE:
For the adjustment, keep the tuner covered
with its lid.

C=P-4.43MHz

4.5V

4.OV

terminal.

10k

and

12V

cLx&

to pin

ohm resistor between base of

line.

(1)

(about,

of

IC1201

-2OdB)

P = 38.9 MHz

(in IF unit).

to the tuner

-

l.O+O.SdB

4

Connection Diagram of Low Impedance Probe
(with Detector).

P-DETECTOR COIL:

A A A

T1202

This coil (in IF unit) has been factory

preset (no adjustment is needed).

1.

Connect sweep generator’s output to pin
of

IC1201.

l

Probe in use:

l

Sweep output level:

2.

PI F AGC:
Apply 4.5V DC to pin

3.

Have AFT muted.

AFT is muted if pin

4.

Connect response lead to
The response lead in use should be a direct
probe with a resistor of

(2)

1

758

DC cut probe

90 dB

(1)

of

IC1201.

of IF unit is grounded.

TP401.

10k

ohms included.

Oks2

To

*

test point

(5)

Adjust so that “Plland

5.

Adjust T1202 so that 38.9 MHz signal is at

maximum (? 50

* Adjust

waveform is of

PIF AGC

“C”

are at the same /eve/.

kHz).

P

(38.9

MHz)

voltage so that the output

approx.

1

Vp-p.

IO kQ

Direct Probe.

-

3

PIF/AFT/SIF/AGC

ADJUSTMENT

(Continued)

AFT COIL ROUOGH ADJUSTMENT:

1.

Connect sweep generator’s output to pin

of IF unit.

l

Probe in use:

l

Sweep output level:

Connection Diagram of

2.

Apply

IC201).

3.

Connect response lead to pin
(The response lead should be a direct probe
with a 1 Ok ohm resistor included.)

l

4.5V

DC

(PIF AGC)

Tune off AFT Mute.

750 DC cut probe
70 dB

75Q

DC Cut Probe.

to TP1203 (pin

(1)

of IF unit.

T1201

(14)

(1)

of

4.

Adjust T1201 to align the marker with the

base line.

,ker

t

1VP-P

/fil!!!A

Align the IF marker with the

base line.

To

osci

I

loscope

*

To pin

(15)

AFT COIL: T1201
Before this adjustment, the AFT coil

(rough adjustment) must have been
completed.

1.

Receive “PAL COLOUR BAR” signal with

bar generator.

e

Signal strength: Over

2.

Connect oscilloscope to

l

Oscilloscope range:

l

Sweep time:

l

Synchronization:

3.

Connect the output of

Generator) to the tuner IF output terminal
across a capacitor of 1

l

SSG

output frequency:

l

SSG

output level:

4.

Adjustment error:

* When the preset switch is set at U or V

position, AFT is turned off.

pF.

55dB,

Below

TP401.

0.5 V/DIV
20 PsedDlV

Horizontal sync.

SSG

(Standard Signal

38.9

MHz

(CW)

38.9

MHz + 5 kHz

approx. 50 dB

38.900

MHz + 25 kHz.

colour

80dB

l

Adjust the sweep generator’s sweep range
to obtain normal S-curve on the oscilloscope
screen.

l Adjust the IF

curve’s amplitude be approx.‘lVp-p.

5.

Set the preset switch at V position and adjust

FINE button (Up or Down) of tuning control so

that the output waveform suffers no beating.

6.

Set the preset switch at NORMAL position.

7.

Adjust

T1201

the output waveform.

Finely adjust to make zero the beating

AGC

voltage so that the

so that no beating is caused at

S-

/

.

PIF/AFT/SIF/AGC

PIF

OVERALL WAVEFORM

1.

Set VT voltage at 5V in VH band.

2.

Connect sweep generator’s output to the test
point of tuner.

l

Probe in use:

l

Sweep output level:

Connect response lead to

3.

The response lead in use should be a direct
probe with a resistor of 1 Ok ohms included.

4.

RF

AGC:

Apply
terminal.
PI F

5.

Apply
unit.
Connect a

6.

parallel to

NOTE:
Cut the resistor’s leads as short as possible.

7.

Turn off AFT:
AFT is turned off if pin
grounded.

approx. 4.OV

AGC:

approx. 4.5V

R1213

120

ohm damping resistor in

(in IF unit).

758

DC cut probe

70dB

TP401.

DC to the tuner

DC to pin

(4)

of

(1)

of

IC1201

IC1201

in IF unit is

ADJUSTMENT (Continued)

8.

AGC

in IF

Adjust IF

waveform is of

9.

Check that the overall waveform is as shown in

Figure below.

AGC

voltage so that the output

approx. lVp-p.

I

Adj-S

RF-AGC

1.

Receive “PAL COLOUR BAR” signal with

2.

Connect DC voltmeter to the tuner

3.

Turn

4 Slowly turn

“NTSC” 4.5MHz

1.

2.

3.

CUT-IN CONTROL: R218

bar generator.

l

Signal strength:

terminal

(Full scale:

maximum output.

until the voltmeter begins to decrease its
reading; then stop turning of

Receive “NTSC COLOUR BAR” signal with

colour

l

Connect

l
l

l Synchronization: Horizontal sync.

Adjust
waveform’s

(TP201).

1OV)

R218

so that the voltmeter reads the

R218

bar generator.

Signal strength:

osci

I

loscope

Voltage range:
Sweep time:

T201

920kHz

53dB ,+ 1dB

(with

75Q

terminated)

in the opposite direction

R218.

TRAP:

so that the oscilloscope

T201

Over 55dB, Below
to

TP40 1.
O.SV/div.
20psecYdiv.

beat be minimum.

80dB.

colour

AGC

5.

Set the signal strength at

check that no noise appears.

6.

Receive “MONOSCOPE PATTERN” signal, and

check that no noise appears.

l

Signal strength:

7.

Set the signal strength at

check that there appears no crossmodulation
beating.

l

AGC

control value:

65dB +, 2dB

53dB ?

(with

65dB f 2dB,

90dB

to

95dB

1

dB.

75fi

terminated)

and

and

5

PIF/AFT/SIF/AGC

ADJUSTMENT (Continued)

SOUND DETECTOR

COIL: T1301

This coil (in IF unit) has been factory

preset (no adjustment is basically
needed).

1.

Connect

l The probe in use should be a

probe.

l

2. IFAGC:

Apply 4.5V DC to pin

3.

Connect DC voltmeter to pin

(Full scale:

AUDIO MUTE CHECKING

1.

Receive “PAL COLOUR BAR” signal.

2.

Set the Sound control at maximum position.

3.

Stop reception of “PAL COLOUR BAR” signal.
(Pull out the antenna)

4.

Check that no output of

from the speaker.

SSG

SSG

output level:

output to pin

80dB (5.5

(1)

of

1OV)

400

(16)

of

IC1201.

75Q

DC cut

MHz

CW)

IC1201.

(9)

of

IC1201.

Hz signal is heard

4.

AUDIO-MUTE ON:

Have pin

value then available on the voltmeter

It should be approx. 4.5V.

5.

AUDIO-MUTE OFF:

Remove the grounding at pin

6.

Adjust T301 so that the voltmeter indicates the
same value as in step 4 above.

(4)

of IF unit grounded, and read the

(VTVM).

(4)

of IF unit.

6

VIDEO CIRCUIT ADJUSTMENT

CRT CUT-OFF ADJUSTMENT

l

R853:

Red Bias control

l

R859:

Green Bias control

l

R865: Blue Bias control

l

Screen control (a part of

l

R857:

Green Drive control

l

R863: Blue Drive control

*

Note:

Prior to this adjustment, warm up the unit
with the beam current of more than 700uA for
more than 30 minutes.

1.

Receive “MONOSCOPE PATTERN” signal with

pattern generator.

2.

Set Red Bias control at

Set Green Bias control at
Set Blue Bias control at MIN position.
Set Green Drive control at CENTER position.

Set Blue Drive control at CENTER position.
Turn the

3.

Set the Screen control at MIN position.

4.

5.

Connect the oscilloscope to

cathode).

6.

Turn

line position.

“N”

key on the remote controller.

5401

(service switch) at the horizontal

MIN

MIN

T602)

position.

position.

TP852

(red

7.

Adjust Sub-Brightness control

blanking pulse level of 10 +

n

nqvpmp

R425

lVp-p

to obtain a

at

TP852.

I-1H-I

8.

Disconnect the oscilloscope

9.

Slowly turn the Screen control clockwise until

the horizontal raster appears slightly, and
stop it.

IO-Here,

11 .Turn

one of the three

green) appears first as the Screen control is

turned. So, touching off the Bias control

belonging to the first

the other two controls so that the horizontal

raster becomes white.

the Screen control counterclockwise until

the horizontal raster disappears, and stop it.

fromTP852.

colours

colour,

(red, blue,

use and move

WHITE BALANCE AND BACK GROUND

l

R857:

Green Drive control

l

R863: Blue Drive control

l

R436: Sub Contrast control

* Note:

Prior to this adjustment, warm up the unit

with the beam current of more than 700pA for

more than 30 minutes.

I. Receive “MONOSCOPE PATTERN” signal with

pattern generator..

2.

Set the Contrast control and Brightness

control at MAX position.

3.

Connect ammeter to TP601 and
(Full scale: 3

mA)

TP602.

SUB-CONTRAST CONTROL: R436

* Note:

Prior to this adjustment, warm up the unit
with the beam current of more than 700uA for

more than 30 minutes.

1.

Receive “MONOSCOPE PATTERN” signal with

pattern generator..

2.

Set the Contrast and Brightness controls at

MAX position.

.

4.

Adjust Sub-Contrast control so that the beam

current becomes

5.

Adjust Green Drive control and Blue Drive

control so that the

9300°K.

6.

Adjust the Contrast control and Brightness

control so that the beam current is

200pA, and check that the colour temperature

is at 9300°K. If the temperature is not at

9300”K,

ADJUSTMENT” and repeat the adjustment.

(X = 0.285, Y = 0.292)

3.

Connect beam ammeter to TP601

TP602 ( +).

(Full scale: 3

4.

Adjust Sub-Contrast control so that the beam

current becomes

(High beam:

go back to “CRT CUT-OFF

mA)

1.1 mA

(rough adjustment).

colour

temperature is at

1.1 mA).

1.1 mA.

approx.

(-)

and

7

PAL

CHROMA

CHROMA

ADJUSTMENT

CIRCUIT ADJUSTMENT “PAL”

l

R806:

. T801:
Note: PIFIAFTIAGC adjustments should have
been completed before starting this adjustment.

1.

Receive the “PAL COLOUR BAR” signal with

colour

2.

Connect the following resistance matrix to pins

3 and 4 of the connector (K), to which an

osci I loscope

(Q-4

3.

Set service switch

position to cut-off the Y-signal.

4.

Turn on the “N” key the remote controller.

5.

Adjust the

controller so that the output waveform of

colour

6.

Adjust IH-delay amp. control

delay phase control (T801) so that the output
waveform shown in Fig. a is corrected to that
shown in Fig.

7.

Return

1 H-delay amp. control
1 H-delay phase control

bar generator.

is connected.

22

ka

Ahh

Resistance Matrix

S401

at the Video Cut

Colour

difference signal becomes Z.SVp-p.

5401

to CENTER position.

control key of the remote

(R806)

and 1

6.

H-

W Y

Figure a. Waveform before the adjustment

c

Figure b.Waveform after the adjustment

Cy

G Mq R B

-

PAL SUB-COLOUR ADJUSTMENT:

1.

Receive the “PAL COLOUR BAR” signal with

colour

bar generator.

2.

Turn on the

3.

Connect oscilloscope to the

cathode).

l

Voltage Range:

l

Sweep time: 20psec/div.

4.

Adjust

red signal have the same level.

“N”

key on the remote controller.

ZOV/div.

R802

so that the white signal (75%) and

R802

TP852

(red

E

-

W

CY G W

T

Same level for the white and red outputs.

8

CHROMA

CIRCUIT ADJUSTMENT

“SECAM”

BELL FILTER ADJUSTMENT:

I. Receive

colour

2.

Connect the oscilloscope to TP901 with the

following settings.

l

Voltage Range: 0.05 Wdiv., AC

l

Sweep Time:

l

Probe:

3.

Adjust the Bell Filter (T903) so that the Red and

Blue portions of the
have the same amplitude.

SECAM

I. Receive

colour

2.

Connect the oscilloscope to

following settings.

l

Voltage Range: IV/div., DC

(Adjust vertical position properly.)

l

“SECAM

bar generator.

COLOUR BAR” signal with

2Ovseddiv.

I/I 0

(3OpF,

colour

KILLER ADJUSTMENT:

“SECAM

bar generator.

Sweep Time:

COLOUR BAR” signal with

20 psec/div.

T903

I

OMQ

or more)

bar signal should

T904

TP902

with the

W

Y Cy G Mg R

-

3.

Adjust T904 to obtain maximum DC voltage

(approx. 7.5V)

Same amplitude

at TP902.

y

6

B-Y

(T901),

Note: Connect a

TP853

respectively to filter out interference

noise.

I.

Receive

colour

2.

Connect the oscilloscope (with two channels)
to TP851 (R-Y) and the
located on the CRT Socket Unit
set.

l

Voltage Range:

l

Sweep Time:

3.

Set service switch
position to cut-off the Y-signal.

4.

Set both the Contrast and Brightness controls
to their maximum positions.

5.

Adjust
levels obtained when the
to minimum (black and white level) and those
when set to
the same.

6.

Return

R-Y

(T902)

O.OOlvF

“SECAM

generator.

T901

and T902 so that the DC output

100% colour

5401

to CENTER position.

DISCRIMINATOR ADJUSTMENT

capacitor to

COLOUR BAR” signal with

TP853

(B-Y), both

(PWB-B)

ZV/div.,

IO

DC

pseddiv.
5401

at the Video Cut

colour

control is set

saturation become

TP851

of the

and

TP851

rl

DC

OV

9

CHROMA CIRCUIT ADJUSTMENT

“NTSC”

SUB-HUE:

I. Receive

colour generator..

2. Connect the oscilloscope to

3. Turn on the “N” key on the remote controller.

4. Set service switch
position to cut-off the Y-signal.

5. Operating the Colour control key on the
remote controller, adjust the B-Y waveform to

approx. 3Vp-p.

6. Adjust Sub-Hue control R835 so that the

waveform is obtained.

7. Return

R835

“NTSC COLOUR BAR” signal with

TP853

(B-Y).

5401

at the Video Cut

5401

to CENTER (normal) position.

Same level

.*-

.-

W

Y Cy G Mg R B

.*-

.-

-

y

-

.--

.-

-

-

.-

d**-=

.*

-

B-Y

IO

ADJUSTMENT OF DEFLECTION LOOP

Note; During the adjustment, keep the unit facing the east.

FOCUS ADJUSTMENT

1.

Receive “MONO SCOPE PATTERN” signal.

2.

Set Contrast and Brightness controls at

CENTER position.

3.

Adjust Focus control to have best focus at the

central area of CRT.

Adjust point

HORIZONTAL CENTERING CONTROL:

R602

This adjustment should be performed

after the purity and convergence
adjustments.

1.

Receive “MONO SCOPE PATTERN” signal.

2.

Adjust

picture is at the position which gives the
relation of A = B .

R602

so that the horizontal center of

VERTICAL LINEARITY CONTROL: R526

1.

Receive “MONO SCOPE PATTERN” signal.

2.

Adjust

picture is at best point.

VERTICAL SIZE CONTROL:

1.

Receive “MONO SCOPE PATTERN” signal.

2.

Set the Brightness and Contrast controls at

maximum position.

R526

so that the vertical linearity of

R503

3.

Adjust

R503

is at best point.

l Vertical size:

so that the vertical size of picture

8% TYP

(Max. 10%)

VERTICAL CENTERING CONTROL:

S501

This adjustment should be performed
after the purity and convergence
adjustments.

1.

Receive “MONO SCOPE PATTERN” signal.

2.

Adjust

picture is at the geometrical center of screen.

5501

so that the vertical center of

11

PURITY ADJUSTMENT

Note: During the adjustment, keep the unit facing the east.

PURITY ADJUSTMENT

1.

I

a

..:.::.::.:..

.>>:.:.:.:.x.

.

..‘.‘..i.........

.

‘::~.>.y::~.~.:

‘.‘.:.:A’

I

..-a.

+

I

Figure A.

Left

.._. :.:.:.:.: .,..
,l ~,~~Li.~ii~..

,

~ii::.:.:.::.:‘:‘:‘:‘:‘:‘:‘:”

. . . . . . . .

:.>:.:.:.:.:.:.:.

.:.:::::::::::::i:i:i:i:i:i:i:i

,

in::::::‘:‘.:.:.:.“:.

.

. . . .

:.:.:.:.:.‘:.:.:.:.~:

. . . .( . . . . . .

,

,

1 iljiiiiiiiiiiiiiiijiiiiiijiiiii
I

I

I

,

\ iijiiiiiiiii~:~~.~

The beam landing is shifted outwards.

: : : : :.

:.::::.::::::::~:..:.:.:.:.:..

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

ii:i~~~:~~:

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

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Prior to the purity adjustment, warm up the

unit with beam current of more than
for

rnore

than 30 minutes.

2.

Receive the green signal alone and adjust the

beam current to

3.

Fully

4.

5.

Set the purity magnet at the position which

degauss

coil.
Before the purity adjustment, it is needed to

roughly adjust the static convergence.

gives zero

Adjustment

6.

Observe the green spots (“a” and
microscope as shown Fig. A, and adjust the
purity magnet so that they are at the
specified landing position.

7.

If the right and left green spots are both

deviated outwards from their landing

positions as shown in Fig. B,’ push the
deflection yoke forwards until their positions
are corrected.

8.

If the beam landing is shifted to

as shown in Figs.

degree of the purity magnet so that the beam

landing is correctly positioned.

9.

Adjust the purity magnet so that the beam

landing is correct at either of the central part,

right and left parts of screen, then check that

the green beams at four corners of screen are

all correctly positioned.

Finally, check that the beam landing at any
pat of screen is satisfactory with the Rank “B”

specifications.

IO. If the green beam is positioned to mix with

the other

backward.

l

Outside of the specified landing:

To front of the deflection yoke.

l

inside of the specified landing:

To back of the deflection yoke.

Il.

Set the raster rotation at

the unit facing the east).

12.

Tighten the screws of the deflection coil.

Tightening torque:

approx.

the CRT with the

(0)

magnetic field.

colour,

770

Cand D,

pull the deflection yoke

adjust the opening

“0”

11

kg

+

2 kg.

700

PA.

degaussing

“b”)

with a

*right

position (with

PA,

or left

Figure

D.

12

CONVERGENCE ADJUSTMENT

Note: During the adjustment, keep the unit facing the east.

CONVERGENCE ADJUSTMENT

This adjustment should be performed

Wedge “a”

4-pole

magnet

6-pole

f

/Wedge

magnet

“c“

after the purity magnet adjustment.

1.

Receive “CROSSHATCH PATTERN” signal.

2.

Set. the Brightness control and Contrast control

at MAX position.

STATIC CONVERGENCE

3.

Adjust the opening degree of the 4-pole

magnet and rotate the magnet to converge
red and blue lines.

4.

Adjust the opening degree of the 6-pole

magnet and rotate the magnet to converge
red, blue and green lines.

DYNAMIC CONVERGENCE

5.

Dynamic convergence (convergence of the

three

colour

is accomplished in the following manner.

Convergence in Fig. a:

insert

wedge”a”

and CRT, and tilt the deflection yoke upward

until the

corrected.

mis-convergence

fields) at the edges of CRT screen

between the deflection yoke

shown in Fig. a is

-

Purity magnet

--*a.....

-4-l

Figurea.

l

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RGB

. . . . . . .

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I .

I ;

r i

i ;
’

:

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

.

Figurec.

Lacqer

RGB

I

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Figureb.

..-....-.

Figured.

*- R

a-...

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: -f- R

, G

.,..

i-1

:

I

: f
:

I

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I

.

:

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f

G
B

B

Convergence in Fig.

Insert wedges

b:

“b”

and

“c”

between the
deflection yoke and CRT, and tilt the

defllection

yoke until the

mis-convergence

shown in Fig. b is corrected.

Convergence in Fig.

Insert wedge

c:

“c”

deeply between the
deflection yoke and CRT, and tilt the
deflection yoke to right until the

mis-

convergence shown in Fig. c is corrected.

Convergence in Fig.

Insert wedge

d:

“b” deeply between the

deflection yoke and CRT, and tilt the
deflection yoke to left until the

mis-

convergence shown in Fig. d is corrected.

6.

Stick the three wedges onto the CRT, and

apply glass tapes thereon.

7.

Apply lacquer to the deflection yoke screw,

magnet unit (made of purity,

4-pole

and

pole magnets) and magnet unit screw.

After the adjustment,

receive either the Red or
the Blue signal and check that there is no mixture
with the other

colour

signal.

6-

13

CRT DISPLAY ADJUSTMENT

Note; During the adjustment, keep the unit facing the east.
SIGN POSITION CONTROL: RI 017

1.

Set the channel number at

2.

Display the channel sign by means of the

channel call of remote control on the screen.

3.

Adjust the sign position by

set 50 mm away from the CRT edge.

2.

R1017

so that it is

CRT edge

1

14