Sony KV-28DX30U Service Manual ▷ View online
21
GREEN
BLUE
RED
(1) Screen centre convergence [Static convergence]
1.
Input a dot pattern signal from the pattern generator.
2.
Normalize the picture setting.
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.
3-2. Convergence
By opening or closing the V.STAT magnet, the red green and blue
dots move in the direction indicated below.
dots move in the direction indicated below.
Note:
Do not adjust the H.STAT by rotating the V.STAT
magnets as this can affect the focus setting.
magnets as this can affect the focus setting.
B
G
R
B
G
R
Fig.3-5
Purity magnets
Align pips on
each magnet
each magnet
Fig.3-4
Align both Purity magnets
to the vertical position
to the vertical position
Center dot
R
G
B
R
G
B
C Board
RV701 (H STAT)
H STAT Convergence
(on mount side)
H STAT Convergence
(on mount side)
H STAT
convergence
control
V.STAT Vertical Static Magnet
Purity control magnets
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
a
c
d
b
Disk Magnets
22
4.
Correction for HMC [Horizontal mis-convergence] and VMC
[Vertical mis-convergence] by using the BMC [Hexapole] magnet.
[Vertical mis-convergence] by using the BMC [Hexapole] magnet.
a). HMC correction by BMC [Hexapole] magnet and movement of
the electron beam.
b). VMC correction by BMC [Hexapole] magnet and movement of
the electron beam.
Adjust the HAMP using HAMPL and HAMPR registers in the
Dynamic Convergence section of the service menu.
Dynamic Convergence section of the service menu.
HTIL correction can be performed by adding a THL correction
assembly to the Deflection yoke.
assembly to the Deflection yoke.
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 )
THL Correction assy
HAMP Adjustment
HTIL Adjustment
YCH Adjustment
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
TLV Adjustment
H-TRAP Adjustment
The H-TRAP should not be adjusted unless absolutely necessary as it
affects the TLV settings.
affects the TLV settings.
+
+
+
YCH VR
Deflection Yoke
+
+
+
TLV VR
Deflection Yoke
HTRAP VR
+
+
+
Deflection Yoke
23
3-3. Focus, Screen (G2) Adjustment
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.
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. White Balance Adjustment
[Adjustment in the service mode using the remote
commander]
commander]
G2 adjustment [RV5376]
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.
cathodes of the CRT.
4.
Whilst watching the picture, adjust the G2 control RV5376
[SCREEN] located on the C Board to the point just before the
flyback return lines disappear.
[SCREEN] located on the C Board to the point just before the
flyback return lines disappear.
Layout of each control
Note : If you are unable to adjust the corner convergence properly,
this can be corrected with the use of permalloy magnets.
1.
Input an all-white signal from the pattern generator.
2.
Enter into the ‘Service Mode’ by pressing ‘TEST’, ‘TEST’ and
‘MENU’ on the Service Commander.
‘MENU’ on the Service Commander.
3.
Select ‘Picture Adjustment’ from the on screen menu display and
press the joystick to the right.
press the joystick to the right.
4.
The ‘Picture Adjustment’ menu will appear on the screen.
[See Page 24]
[See Page 24]
5.
Select ‘Sub Contrast’ and adjust to 7.
6.
Adjust the ‘G-Drive’ and the ‘B-Drive’ so that the white
balance becomes optimum.
balance becomes optimum.
7.
Press the ‘TV’ button on the remote commander to return to TV
operation.
operation.
White balance adjustment for TV mode
Focus
Control
Control
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
a
b
d
Permalloy Assy
X-4387-214-1
X-4387-214-1
c
Install the permalloy assembly
for the area that needs correcting.
for the area that needs correcting.
Convergence adjustment with permalloy
Screen
(G2)
(G2)
24
SECTION 4
CIRCUIT ADJUSTMENTS
5
+
+
(ON SCREEN
DISPLAY)
DISPLAY)
(DIGIT 5)
(VOLUME
+
)
(TV)
4-1. ELECTRICAL ADJUSTMENTS
Service adjustments to this model can be performed
using the supplied Remote Commander RM-888.
using the supplied Remote Commander RM-888.
1.
Turn on the main power switch and enter into the stand-by
mode.
mode.
2.
Press the following sequence of buttons on the Remote
Commander.
Commander.
•
‘TT--’ will appear in the upper right corner of the
screen.
Other status information will also be displayed.
screen.
Other status information will also be displayed.
3.
Press ‘MENU’ on the remote commander to obtain the
following menu on the screen.
following menu on the screen.
4.
Move to the corresponding adjustment using the button on the
remote commander.
remote commander.
5.
Press the + button to enter the selected adjustment.
6.
Turn off the power to quit the service mode when adjustments
have been completed.
have been completed.
HOW TO ENTER INTO SERVICE MODE
TEST MENU
> Picture Adjustment
Geometry
Wide
IC status
MSP
Dynamic Convergence
Current TV status
PICTURE ADJUSTMENT
AFC mode
1
REF position
3
SCP BGR
1
SCP BGF
1
Trap fo
9
Sub contrast
Adj
Sub colour
Adj
Sub brightness
Adj
Green drive
Adj
Blue drive
Adj
Green cutoff
Adj
Blue cutoff
Adj
Gamma
0
Pre / overshoot
0
Y delay
3
D Pic
ON/OFF
D Colour
ON/OFF
DC Transfer
ON/OFF
GEOMETRY ADJUSTMENT - 4:3
V size
Adj
V position
Adj
S Correction
Adj
V Linearity
Adj
H size
Adj
H position
Adj
Pin Amp
Adj
Pin Phase
Adj
AFC Bow
Adj
AFC Angle
Adj
EHT V
1
EHT H
0
Lo Corn Pin
Adj
Up Corn Pin
Adj
WIDE ADJUSTMENT - 4:3
V Aspect
0
V Scroll
25
Upper V Lin
0
Lower V Lin
0
Left Blanking
1
Right Blanking
11
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