Screen G2; Focus - Sony KV-28DS20U 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
permalloys.
a
a-d: screen-corner
convergence defect
c
Permalloy Assy
X-4387-214-1
Convergence adjustment with permalloy.
Purity magnet
BMC (Hexaploe) magnet
V STAT convergence magnet
Y-splitting axis correction magnet
Fig 3-6
b
d
3-3. SCREEN (G2)
SCREEN G2 ADJUSTMENT
1. Input a dot signal from the pattern generator.
2. Set the Picture, Brightness and Colour to minimum.
3. Apply 175V DC from an external power supply to the
R, G and B cathodes of the CRT.
4. Whilst watching the picture, adjust [SCREEN G2] located on
the FBT [flyback transformer] to the point just before the
flyback return lines disappear.

3-4. FOCUS

1. Receive a television broadcast signal.
2. Normalise the picture setting.
3 Adjust the focus control located on the FBT [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.
25
FOCUS
SCREEN (G2)