DOWNLOAD Sony KV-G21MW3 Service Manual ↓ Size: 1.96 MB | Pages: 39 in PDF or view online for FREE

– 13 –

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

}

normal

•

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

•

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.

1. Input a white signal with the pattern generator.

Contrast

Brightness

2. Set the pattern generator raster signal to green.

3. 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.)

4. Move the deflection yoke forward and adjust so that entire

screen is green. (See Figure 3-1.)

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

condition.

6. When the position of the deflection yoke has been decided,

fasten the deflection yoke with the screws.

7. If the beam does not land correctly in all the corners, use a

magnet to adjust it. (See Figure 3-4.)

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

Purity control

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

b

a

c

d

GREEN

BLUE      RED

– 14 –

•

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.

•

Operation of BMC (Hexapole) magnet.

If the blue or red dot does not converge 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.

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.

•

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

and vertical size.

•

Minimize the brightness setting.

•

Provide dot pattern.

R     G     B

G

R

B

Center dot

C board

RV 701

SCREEN (G2)

V.STAT Magnet

V.STAT

Purity

B

R

B

R

a

b

b

b

a

b

a

b

a

R

G

B

b

B

G

R

b

b

a

a

1

2

3

G

G

B     G     R

R     G     B

a

BMC magnet

b

– 15 –

Adjust FOCUS control on the flyback transformer for the best

focus.

•

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.

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.

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     B

B     G     R

B     G     R

R     G     B

a-d : screen-corner
misconvergence

b

a

c

d

a

d

c

b

a to d : Permalloy assembly

Fix a Permalloy assy
corresponding to the
misconverged areas

Note: Screen VR is not used.

FOCUS

SCREEN
(NOT USED)

– 16 –

Set the standby condition (Press 

POWER

 button on the

commander) and then press 

POWER

 button again, hereupon it

becomes TV mode.

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.

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.

Note

WHITE POINT R

WHITE POINT G

WHITE POINT B

Initial DATA

28

20

20

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.

Item
number

09

0A

0B

Adjustment
Item

RDR

GDR

BDR

177 ± 2 V DC

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 25

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

RDR

09

60

00

V3.2C

058S/
060S

60

00

V3.2C

058S/
060S

OEM CODE

PAL or 
NTSC

German A2 Stereo

Software Version #

WRITE

1 F

RDR

09

0

Executes the writing

Green

WRITE

1 F

RDR

09

0

Executes the writing
(bottom line disappears)

0 V