Samsung CHA4217L, Service Manual

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6-4-3 Bow Convergence Adjustments
CONDITIONS
Orientation: Monitor facing east.
Display Image: Crosshatch pattern with mixed
RGB colors.
Required tools: Philips (+) screwdriver, 1.5 mm
Hexkey, 2.5 mm
PROCEDURE
Bow convergence adjustments are not available
for the CRTs used in the CHA42*7L/5**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 Figure 6-11). 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.
6-4-4 (a) HORIZONTAL LINE RED AND BLUE
BALANCE CONVERGENCE
Figure 6-14. Horizontal Line Balance
Misconvergence
PROCEDURE
Use a 2.5 mm hexkey at the Horizontal Balance
Coil (Xv). Turning it right raises the right end of
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
Figure 6-15. Vertical Line Balance
Misconvergence
PROCEDURE
Use a 1.5 mm phillips (+) screwdriver at the YH
variable resistor. Turning the VR to the left tilts
the 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
Figure 6-16. Upper and Lower Balance
Misconvergence
PROCEDURE
Use a 1.5 mm phillips (+) screwdriver at theYv
variable resistor. 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
6-10 CHA42*7L/5**7L
BLUE
RED
RED BLUE
RED
BLUE
RED
BLUE
Yh
Yv
Xv
Y
H
Y
V
X
V
Figure 6-13. Deflection Yoke Caps