Sharp 34N-WF5H, Service Manual

Page: 21 / 87

21
34N-WF5H
23 Purity adjustment Visual adjustment procedure
(1) Check the purity magnet assembly mounting position.
(2) Receive the crosshatch pattern signal.
(3) Adjust the raster tilt by turning the deflection yoke.
(Align the projections at both ends of CRT’s X axis with the screen’s X
axis.)
(4) Using the 4-pole and 6-pole magnets, adjust the static convergence at
the center of the raster.
(Refer to the convergence adjustment.)
(5) Check the standard mode, and receive the green-only (or white) signal
from the pattern generator.
(6) Keep the deflection yoke’s opening horizontal together with the neck.
Move the deflection yoke to and fro until the screen turns green only (or
white). If the red and blue (or yellow and cyan) colors at both sides are
not symmetrical, get them symmetrical by opening and closing the 2-
pole magnet in reference to its axis.
(7) Readjust the deflection yoke’s tilt while looking at the crosshatch
pattern. Tighten up the deflection yoke lock screw to secure the yoke in
position.
(8) Finally fix the deflection yoke opening with the wedge.
38mm
Rear end of purity magnet assembly
CRT neck
Mounting dimension
Crosshatch pattern
X axis
X axis
Crosshatch
Projection
Cabinet
2-pole magnet
No. AdjustingPoint Adjusting Procedure
Purity magnet assembly mounting position