Sony KV-28FQ70B Service Manual ▷ View online
- 21 -
3-3. Focus 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. Screen (G2), White Balance
[Adjustment in the service mode using the remote
commander]
commander]
G2 adjustment
1.
Input a dot signal from the pattern generator.
2.
Set the Picture, Brightness and Colour to minimum.
3.
Apply 165V DC from an external power supply to the R, G
and B cathodes of the CRT.
and B cathodes of the CRT.
4.
Whilst watching the picture, adjust the G2 control [SCREEN]
located on the flyback transformer to the point just before the
flyback return lines disappear.
located on the flyback transformer 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.
Program the Remote Commander for operation in Service Mode.
[ See Page 22 ].
[ See Page 22 ].
3.
Enter into the ‘Service Mode’ by pressing ‘VIDEO’ button twice
and ‘MENU’ on the Service Commander.
and ‘MENU’ on the Service Commander.
4.
Select ‘Service’ from the on screen menu display and press
‘Right Arrow’.
‘Right Arrow’.
5.
The ‘Service’ menu will appear on the screen.[See Page 23]
6.
Set the ‘Contrast’ to MAX.
7.
Set the ‘R-Drive’ to 50.
8.
Adjust the ‘G-Drive’ and the ‘B-Drive’ so that the white
balance becomes optimum.
balance becomes optimum.
9.
Press the ‘OK’ button to write the data for each item.
10. Set the ‘Contrast’ to MIN.
11. Set the ‘R-Cutoff’ to 29.
12. Adjust the ‘G-Cutoff’, and the ‘B-Cutoff’ with the left and
11. Set the ‘R-Cutoff’ to 29.
12. Adjust the ‘G-Cutoff’, and the ‘B-Cutoff’ with the left and
right buttons on the remote commander so that the white
balance becomes optimum.
balance becomes optimum.
13. Press the ‘OK’ button to write the data for each item.
White balance adjustment for TV mode
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
Focus
Screen
- 22 -
4-1. Electrical Adjustments
Service adjustments to this model can be performed using the
supplied remote Commander RM-938.
supplied remote Commander RM-938.
SECTION 4 CIRCUIT ADJUSTMENTS
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3.
Press 99999. All three LED’s should light.
The remote commander is now set to Service Mode.
The remote commander is now set to Service Mode.
4.
To return the remote commander to normal operation mode
repeat steps 1. and 2. then press 00000. All three LED’s
should light.
The remote commander is now set to normal mode.
repeat steps 1. and 2. then press 00000. All three LED’s
should light.
The remote commander is now set to normal mode.
Programming the Remote Commander for
Operation in Service Mode
Operation in Service Mode
Setting the TV into Service Mode
1.
Program the remote commander for operation in Service
Mode as described above.
Mode as described above.
2.
Turn on the TV main power switch.
3.
Press the video standby button
on the remote
commander twice.
‘TT ’ will appear in the upper right corner of the screen.
Other status information will also be displayed.
‘TT ’ will appear in the upper right corner of the screen.
Other status information will also be displayed.
4.
Press ‘MENU’ on the remote commander to obtain the
following menu on the screen.
5.
Move to the corresponding adjustment item using the
up or down arrow buttons on the Remote Commander.
up or down arrow buttons on the Remote Commander.
6.
Press the right arrow button to enter into the required menu item.
7.
Press the ‘Menu’ button on the Remote Commander to quit the
Service Mode when all adjustments have been completed.
Service Mode when all adjustments have been completed.
Note :
·
After carrying out the service adjustments, to prevent the
customer accessing the ‘Service Menu’ switch the TV set
OFF and then ON.
customer accessing the ‘Service Menu’ switch the TV set
OFF and then ON.
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1.
Press the VCR/TV/DVD button until the
TV LED lights.
TV LED lights.
2.
Press and hold the yellow button for
approx. 5 seconds until the TV LED
flashes quickly.
approx. 5 seconds until the TV LED
flashes quickly.
- 23 -
Sub Colour Adjustment
1.
Receive a PAL colour bar signal.
2.
Connect an oscilloscope to Pin 6 of CN7001 [A Board].
3.
Program the Remote Commander for operation in Service Mode.
[ See Page 22 ].
[ See Page 22 ].
4.
Adjust the ‘Sub Colour’ [ Using ‘VIDEO’ ‘VIDEO’ ‘12’ ] so
that the Cyan, Magenta and Blue colour bars are of equal levels
as indicated below.
that the Cyan, Magenta and Blue colour bars are of equal levels
as indicated below.
Same Level
B-Out Waveform
Sub Brightness Adjustment
1.
Input a Monoscope pattern.
2.
Program the Remote Commander for operation in Service Mode.
[ See Page 22 ].
[ See Page 22 ].
3.
Press ‘VIDEO’ ‘VIDEO’ 13 on the Remote Commander.
4.
Adjust the ‘Sub-Brightness’ data so that there is barely a
difference between the 0 IRE and 10 IRE signal levels.
difference between the 0 IRE and 10 IRE signal levels.
1.
Input a video signal that contains a small 100% white area on a
black background.
black background.
2.
Connect an digital voltmeter to Pin 10 of J7376 [C Board].
3.
Program the Remote Commander for operation in Service Mode.
[ See Page 22 ].
[ See Page 22 ].
4.
Adjust the Sub-Contrast [ Using ‘VIDEO’ ‘VIDEO’ ‘11’ ] to
obtain a voltage of 105 +/- 5V.
obtain a voltage of 105 +/- 5V.
Sub Contrast Adjustment
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- 24 -
1.
Program the Remote Commander for operation in Service Mode.
[ See Page 22 ] and enter into the ‘Geometry’ service menu.
[ See Page 22 ] and enter into the ‘Geometry’ service menu.
2.
Select and adjust each item in order to obtain the optimum image.
Deflection System Adjustment
V SIZE
V LIN
AFC BOW
V POSITION
H POSITION
H SIZE
PIN AMP
TRAPEZIUM
UP CORNER PIN
AFC ANGLE
LO CORNER PIN
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Test Mode 2 is available by rogramming the Remote Commander for
operation in Service Mode [ As shown on Page 22 ] then pressing the
‘VIDEO’ button twice, OSD ‘TT’ appears. The functions described
below are available by selecting the two numbers. To release the ‘Test
mode 2’, press 00, 10, 20 ... or switch the TV set into Stand-by
mode.
operation in Service Mode [ As shown on Page 22 ] then pressing the
‘VIDEO’ button twice, OSD ‘TT’ appears. The functions described
below are available by selecting the two numbers. To release the ‘Test
mode 2’, press 00, 10, 20 ... or switch the TV set into Stand-by
mode.
4-2. TEST MODE 2:
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