Sharp DV-1600 Series - Page 10

CRT ADJUSTMENT
Step
Adjust point
Connection
Procedure
1.
Focus control
(1) Receive monoscope pattern
t
signal.
1 (1) Adjust focus control to have best focus
at the central area of CRT.
, (2) Set contrast control at MAX ’
position.
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(3) Set brightness control at MAX /
position (with 1 .OmA of beam
1
current). /
(Instead of monoscope pattern
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2. Purity magnet
signal, it is allowed to use white /
pattern signal of 88% modulation.) i
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(1) Receive monoscope pattern
signal,
Figure 20.
(2) Degauss CRT shadow mask with 1
degaussing coil.
,
(3) Prior to the adjustment, operate
/
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the receiver for more than 10
1 (4) ~~~~ty magnets at the
horizontal position.
(5) Bring deflection yoke as near
purity magnet as possible.
j (6) Set R853 (R-bias) and R865.
/
(B-bias) at MIN position, then
turn R859 (G-bias) until green
raster appears.
Green
Figure 21.
(7) Adjust purity magnets for a
uniform green vertical band at I
/
the center of CRT screen.
For this adjustment, motion of
each magnet should be as slight I
as possible.
1 (8) Shift deflection yoke toward
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CRT to achieve uniform green ,
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purity on the entire of CRT
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screen.
I (9) Perform white balance opera-
/
/
tion, and see if white balance in
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picture is normal.
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3. ’ Convergence
/ (1) Receive crosshatch pattern Static (center) convergence:
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signal.
/ (2) Set contrast control at
(1) Rotate 4-pole magnet to converge red
and blue lines.
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CENTER position.
j (3) Set brightness control at
1 (2) After completing red and blue center
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convergence, rotate 6-pole magnet to
CENTER position.
;ly
converge the red and blue and green lines.
namic convergence:
.
: (3) Convergence of the three colour fields at
,
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the edges of CRT screen is accomplished
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by positioning of deflection yoke tilt
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adjustment wedges.
j (4) After the adjustment, secure deflection
yoke with wedges.
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