KP-53V100 - Sony TV Service Manual (repair manual). Page 16

1.  Display a dot pattern (see the details of using the internal test 

patterns at the end of the previous section).

2.  Enter the service mode.
3.  Cover the red and blue CRT lenses with lens caps to allow only green 

to show (or use the method shown in the note below for turning off 

the CRTs individually without using lens caps).

4.  Turn the green focus control on the focus block to the right and set 

it to overfocus to enlarge the spot (the dot).  See figure at the end of 

Section 2-3 for the location of the 2-pole magnet adjusting tabs.

5.  Adjust the green CRT’s 2-pole magnet so that the small bright spot is 

in the center of the large defocused spot.

6.  Adjust the green focus control on the focus block and set it for the 

best focus.

7.  Repeat steps 1 through 6 for the red CRT, except now you will cover 

the green and blue CRT lenses with lens caps to allow only red to 

show (or use the method shown in the note below  

for turning 

off the CRTs individually without using lens caps) and you will adjust 

the red focus control on the focus block.

Note: If lens caps are unavailable, you can cut off the unnecessary color 

beams in the service mode by individually changing the data from “1” to 

“0” in category VPNT, item 28 RON (red), item 29 GON (green), or item 

30 BON (blue).

Use the center dot

Large de-focused spot

Small focused spot

1.  Display a dot pattern (see the details of using the internal test 

patterns at the end of section 2-5, item 4).

2.  Enter the service mode.
3.  Cover the red and blue CRT lenses with lens caps to allow only green 

to show (or use the method shown in the note below for turning off 

the CRTs individually without using lens caps).

4.  Turn the green focus control on the focus block to the left and set it to 

under-focus to enlarge the  

spot.

5.  Adjust the 4-pole magnet so that the enlarged spot in the center of 

the screen becomes a perfect  

circle.

6.  Adjust the green focus control on the focus block and set it for the 

best focus. 

7.  Repeat steps 1 through 6 for the red CRT, except now you will cover 

the green and blue CRT lenses with lens caps to allow only red to 

show (or use the method shown in the note below  

for turning 

off the CRTs individually without using lens caps) and you will adjust 

the red focus control on the focus block.

8.  Repeat steps 1 through 6 for the blue CRT, except now cover the 

green and red CRT lenses with lens caps to allow only blue to show. 

Adjust the blue focus control on the focus block (or use the method 

shown in the note below for turning off the CRTs individually without 

using lens caps).   However, for the blue CRT do not make the 

enlarged spot a perfect circle as indicated in step 5; instead, adjust 

the 4-pole magnet so that the height of the enlarged blue spot in the 

center of the screen is approx. 1.5 times the width of the spot.

Note: If lens caps are unavailable, you can cut off the unnecessary color 

beams in the service mode by individually changing the data from “1” to 

“0” in category VPNT, item 28 RON (red), item 29 GON (green), or item 

30 BON (blue).

x

y

x : y = 1:1.5 (BIue)
x : y = 1:1 (Green, Red)

Use the center dot

 

Note: Adjust the blue dot to be slightly larger than red and green dots. 

This adjustment provides a more pleasing picture to the customer.

1. Select the video menu and set the picture mode to “VIVID”.
2. Enter service mode.
3. Change TV mode to the video-1 input mode.
4. Select adjustment category “PJE”, and press 6 as many times as 

necessary to display the dot pattern on the screen.

5. Adjust the blue focus control on the focus block to adjust the diameter 

of the dots in the center of the screen as shown in the figure below.

Dmm Max

Screen Size

Diameter

43"

6mm

53"

8mm

61"

9mm