Samsung CHB5707L/5237L Service Manual page 25

6-4-3 Bow Convergence Adjustments
CONDITIONS
Orientation: Monitor facing east.
Display Image: Crosshatch pattern with mixed
RGB colors.
Required tools: Flat-head (Ð) screwdriver, 1.5 mm
Philips (+) screwdriver, 1.5 mm
Hexkey, 2.5 mm
PROCEDURE
Bow convergence adjustments are not available
for the CRTs used in the CHB5**7L/6**7L/7**7L
monitors. While all CRTs have bow convergence
magnets, they are sealed in the CRT factory and
are not user or service technician adjustable. Do
not touch these magnets (see Figures 6-12 and
6-13). If bow convergence adjustment is out of
alignment, replace the CRT.
Bow misconvergence should not exceed the values
listed in Table 6-5: Misconvergence Tolerances.
6-4-4 Balance Convergence Adjustments
Balance Convergence involves alignment of red
and blue lines when they are misaligned at one
end more so than at the other end. The Deflection
Yoke holds the balance coils which can correct
balance misconvergences.
HORIZONTAL
BALANCE COIL
Figure 6-15. SDD Deflection Yoke
Y
H
Figure 6-16. Toshiba Deflection Yoke
CHB5**7L/6**7L/7**7L
Y
H
Xv
Y
v
Y
V
X
V
6-4-4 (a) HORIZONTAL LINE RED AND BLUE
BALANCE CONVERGENCE
RED
Figure 6-17. Horizontal Line Balance Misconvergence
Use a 2.5 mm hexkey at the Horizontal Balance
Coil (X ). Turning it right raises the right end of
V
the blue line and lowers the left end. Turning the
VR to the left lowers the right end of the blue line
and raises the left end.
6-4-4 (b) VERTICAL RED AND BLUE BALANCE
CONVERGENCE
BLUE
Figure 6-18. Vertical Line Balance Misconvergence
Use a 1.5 mm screwdriver (flat-head [Ð] for SDD
DYs and phillips type [+] for Toshiba DYs) at the
Y variable register. Turning the VR left tilts the
H
blue line to the right. Turning it right tilts the blue
line to the left.
6-4-4 (c) UPPER AND LOWER HORIZONTAL LINE
CONVERGENCE
RED
BLUE
RED
BLUE
Figure 6-19. Upper and Lower Balance Misconvergence
Use a 1.5 mm screwdriver (flat-head [Ð] for SDD
DYs and phillips type [+] for Toshiba DYs) at the
Yv variable register. Turning the VR to the left
moves the blue line at the top upward and at the
bottom, the line moves downward. Turning it
right moves the blue line at the top downward
and at the bottom, the line moves upward.
6 Alignment and Adjustments
BLUE
RED
6-11