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DP-4X LENS FOCUS ADJUSTMENT
Preparation for adjust-
ment
•
Receive the Cross-hatch
pattern signal.
•
The electrical focus ad-
justment should have
been completed.
•
Deflection Yoke tilt
should have been ad-
justed.
•
Brightness = 50%
•
Contrast = 60% to 70%
Adjustment procedure
1) Short the 2 pin sub-
miniature connector on
the CRT P.W.B. TS, to
produce only the color
being adjusted and ad-
just one at a time. (The
adjustment order of R,
G and B is just an ex-
ample.)
2) (See Figure 1) Loosen
the fixing screw on the
lens assembly so that
the lens cylinder can be
turned. (Be careful not
to loosen the screw too
much, as this may
cause movement of the
lens cylinder when tight-
ening.)
3) Rotate the cylinder back
and forth to obtain the
best focus point, while
observing the Cross-
Hatch. (Observe the
center of the screen).
• Hint: Located just below
the screen are the two
wooden panels. Re-
move the panels to al-
low access to the focus
rings on the Lenses.
FIXING SCREW
Or FIXING WING NUT
LENS ASSEMBLY R, G, B.
Figure 1
4) After completing optical
focus, tighten the fixing
screws for each lens.
5) When adjusting the
Green Optical focus, be
very careful. Green is
the most dominant of
the color guns and any
error will be easily seen.
6) Repeat Electrical Focus
if necessary.
PAGE 08-16
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