Focus, Screen [G2] Adjustment; White Balance - Sony FD Trinitron KV-28FX65B Service Manual

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.
a
a-d: screen-corner
convergence defect
c
Install the permalloy assembly
for the area that needs correcting.
b
Permalloy Assy
X-4387-214-1
d
Convergence adjustment with permalloy
Purity magnet
BMC (Hexaploe) magnet
V STAT convergence magnet
Y-splitting axis correction magnet
b
d
a
c
24
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.
Focus
Control
No
Function
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.
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.
3-4. White Balance Adjustment
[Adjustment in the service mode using the remote
commander]
White balance adjustment for TV mode
1. Input an all-white signal from the pattern generator.
2. Enter into the 'Service Mode' by pressing 'TEST', 'TEST' and
'MENU' 'MENU' on the Service Commander.
3. Select 'Backend' from the on screen menu display and press
'OK'.
4. The 'Backend' menu will appear on the screen.[See Page 26]
5. Set the 'Contrast' to MAX.
6. Set the 'R-Drive' to 41.
7. Adjust the 'G-Drive' and the 'B-Drive' so that the white
balance becomes optimum.
8. Press the 'OK' button to write the data for each item.
9. Set the 'Contrast' to MIN.
10. Set the 'R-Cutoff' to 31.
11. 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.
12. Press the 'OK' button to write the data for each item.