Sony KV-28DS65U Service Manual ▷ View online
25
Fig.3-4
Fig. 3-5
3-2. CONVERGENCE
(1)
Screen centre convergence
[Static convergence]
[Static convergence]
1.
Input a dot signal from the pattern generator.
Normalize the picture setting.
Normalize the picture setting.
2.
[Moving horizontally], adjust the H.STAT control so that the
horizontal red, green and blue dots coincide at the centre of
the screen.
horizontal red, green and blue dots coincide at the centre of
the screen.
3.
[Moving vertically], adjust the V.STAT magnet so that the
vertical red, green and blue dots coincide at the centre of the
screen.
vertical red, green and blue dots coincide at the centre of the
screen.
•
If the horizontal dots are unable to coincide with the variable
range of the H.STAT convergence, adjust together with the
V.STAT convergence while tracking.
[Adjust the convergence by tilting the V.STAT convergence
or by opening and closing the V.STAT convergence.]
range of the H.STAT convergence, adjust together with the
V.STAT convergence while tracking.
[Adjust the convergence by tilting the V.STAT convergence
or by opening and closing the V.STAT convergence.]
4.
Movement of the red, green and blue dots by tilting the
V.STAT magnet and by opening or closing the V.STAT
magnet.
V.STAT magnet and by opening or closing the V.STAT
magnet.
a).
By opening or closing the V.STAT magnet, the red, green
and blue dots move as indicated below.
and blue dots move as indicated below.
b).
By rotating the V.STAT magnet counter clockwise, the red,
green and blue dots move as indicated below.
green and blue dots move as indicated below.
Purity control corrects
this area.
this area.
Disk magnets or
rotatable disk
magnets correct
these areas (a-d).
rotatable disk
magnets correct
these areas (a-d).
Deflection yoke positioning
corrects these areas
corrects these areas
H.STAT
convergence
control
V.STAT
vertical static magnet
Centre dot
H.STAT VR on
mount side
RV5376
Screen (G2)
Screen (G2)
H.STAT convergence
(Open)
(Close)
B
G
R
B
G
R
B
G
R
GREEN
BLUE
RED
26
B
G
R
B
G
R
B
G
R
H M C c o r r e c t i o n ( A )
H M C c o r r e c t i o n ( B )
A < B
A = B
R G
B
R G B
A > B
A = B
R
G B
R G B
C < D
C = D
C > D
C = D
R
G
G
B
C
D
C
D
R
G
B
R
G
B
R
G
B
V M C c o r r e c t i o n ( A )
V M C c o r r e c t i o n ( B )
D1
H-TILT
CBH
RV1502
RV1503
c).
By rotating the V.STAT magnet clockwise, the red, green and
blue dots move in the direction indicated below.
blue dots move in the direction indicated below.
d).
By opening or closing the V.STAT magnet, the red, green
and blue dots move in the direction indicated below.
and blue dots move in the direction indicated below.
Note :
If the blue dot does not coincide with the red and
green points correct the points by using the BMC
[Hexapole] magnet.
green points correct the points by using the BMC
[Hexapole] magnet.
5.
Correction for HMC [horizontal mis-convergence] and
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
VMC [vertical mis-convergence] by using the BMC
[Hexapole] magnet.
a).
HMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
b).
VMC correction by BMC [Hexapole] magnet and movement
of the electron beam.
of the electron beam.
(2)
Dynamic convergence
HTIL
1.
HTIL correction can be performed by adjusting RV1502 on
the D1 board.
the D1 board.
COR.BOW
2.
COR.BOW correction can be performed by adjusting
RV1503 on the D1 board.
RV1503 on the D1 board.
27
FOCUS
Layout of each control
Note :
If you are unable to adjust the corner convergence
properly, this can be corrected with the use of
permalloys.
properly, this can be corrected with the use of
permalloys.
3-3. FOCUS
1.
Receive a television broadcast signal.
2.
Normalize the picture setting.
3.
Adjust the focus control located on the flyback transformer
to obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
to obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
3-4. SCREEN (G2), WHITE BALANCE
[Adjustment in the service mode using the remote
commander]
commander]
G2 adjustment (RV701)
1.
Input a dot signal from the pattern generator.
2.
Set the Picture, Brightness and Colour to minimum.
3.
Apply 170V DC from an external power supply to the
R, G and B cathodes of the CRT.
R, G and B cathodes of the CRT.
4.
Whilst watching the picture, adjust RV701 [SCREEN]
located on the C Board to the point just before the flyback
return lines disappear.
located on the C Board to the point just before the flyback
return lines disappear.
Y-splitting axis correction magnet
V STAT convergence magnet
BMC (Hexaploe) magnet
Purity magnet
a-d: screen-corner
convergence defect
convergence defect
a
b
c
d
Convergence adjustment with permalloy
Permalloy Assy
X-4387-214-1
X-4387-214-1
28
White balance adjustment
1.
Input an all-white signal.
2.
Enter into the Service Mode by pressing ‘TEST’, ‘TEST’
and ‘MENU’ ‘MENU’on the Service Commander.
and ‘MENU’ ‘MENU’on the Service Commander.
3.
Move the OK button down until ‘MCP CXA2101’is selected
then move the OK button to the right.The ‘MCP CXA2101’
menu will appear on the screen.
then move the OK button to the right.The ‘MCP CXA2101’
menu will appear on the screen.
4.
Select ‘19 R DRIVE’ by moving the OK button down until
‘19 R DRIVE’ is selected then move the OK button to the
right and adjust to 41 by pushing the OK button up or down.
‘19 R DRIVE’ is selected then move the OK button to the
right and adjust to 41 by pushing the OK button up or down.
5.
Press the OK button to write the data.
6.
Adjust the ‘21 G DRIVE’ and ‘23 B DRIVE’ so that the
white
balance becomes optimum.
white
balance becomes optimum.
7.
Press the OK button to write the data.
8.
Input a 5 - 10 NIT all-white signal.
9.
Select ‘25 R CUT-OFF’ by moving the OK button down
until ‘25 R CUT-OFF’ is selected then move the OK button
to the right and adjust to 41 by pushing the OK button up or
down.
until ‘25 R CUT-OFF’ is selected then move the OK button
to the right and adjust to 41 by pushing the OK button up or
down.
10.
Adjust the ‘27 G CUT-OFF’, and ‘29 B CUT-OFF’ so that
the white balancebecomes optimum.
the white balancebecomes optimum.
11.
Press the OK button to write the data.
Item
No
Adjustment menu
Data Amount
1
RED
ON
2
GREEN
ON
3
BLUE
ON
4
CBLK
OFF
5
AKB T
OFF
6
BLK SW
OFF
7
DA TEST
OFF
8
HY SW
0
9
PICTURE
57
10
LIMIT LEVEL
1
11
HUE
31
12
SYSTEM
1
13
COLOR
31
14
AGE WHT
OFF
15
AGE BLK
OFF
16
BRIGHT
31
17
YS/YM SW
0
18
YM/VM
0
19
SHARPNESS
35
20
D COL
0
21
G DRIVE
ADJ
22
CLP SW
1
23
B DRIVE
ADJ
24
CLP MSK
0
25
R CUT OFF
32
26
ABL MODE
2
27
G CUT OFF
ADJ
28
ABL TH
1
29
B CUT OFF
ADJ
30
SUB BRT
ADJ
31
H SEP SEL
1
32
FIX SEL
0
33
V - TC
2
34
H WIDTH
0
35
HD TC
1
36
HS MASK
1
37
CB OFF SET 1
7
38
CR OFF SET 1
7
39
CB OFF SET 2
7
40
CR OFF SET 2
7
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