Sharp 25WF30, Руководство по обслуживанию

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9
9-1
9-2
25WF30
No.
Adjustment point
Adjustment Condition / Procedure
W
aveform or others
1
CONVER- GENCE ADJUSTMENT (T
o be done
after the purity adjustment.)
1.
Receive the Crosshatch Pattern signal.
2
.
Using the remote controller
, call NORMAL
mode.
Static convergence 1.
T
urn the 4 - pole magnet to a proper opening
angle in order to superpose the blue and red colours.
2.
T
urn the 6 - pole magnet to a proper opening
angle in order to superpose the green colour over the blue and red colours.
Dynamic convergence 1.
Adjust the convergence on the fringes of the screen in the following steps. a)
Fig. 5-1: Drive the wedge at point "a" and swing the deflection coil upward.
b)
Fig. 5-2: Drive the wedge at point "b" and "c" and swing the deflection coil downward.
c)
Fig. 5-3: Drive the "c" wedge deeper and swing the deflection coil rightward.
d)
Fig. 5-4: Drive the "b" wedge deeper and swing the deflection coil leftward.
2.
Fix all the wedges on the CR
T
and apply glass
tape over them.
3
.
Apply lacquer to the deflection yoke lock screw
,
magnet unit (purity
, 4 - pole, 6 - pole magnets)
and magnet unit lock screw
.
Finally received the Red - only and Blue - only signals to make sure there is no other colours on the screen.
CONVERGENT ADJUSTMENT
Fig.
5-1
Fig.
5-2
Fig.
5-3
Fig.
5-4
Fig.
5-5
Fig.
5-6
R G B
R G B
CR
T
Neck
Lacquer
Purity Magnet
4-Pole Magnet
6-Pole Magnet.
26
±
0.5mm
B G R
B G R
R G B
B G R
B G R
R G B
W
edge "a"
W
edge "b"
W
edge "c"
About
100 Deg.
About 100 Deg.
Lacquer
UNIFORMITY
ADJUSTMENT
No.
Adjustment point
Adjustment Condition / Procedure
W
aveform or others
Before adjustment begin, Horizontal magnetic field = V
ertical magnetic field = 0.1G
Make sure degauss it. (North direction Red uniformity) 1
.
Horizontal mf = Set to monocolour screen Red and adjust to + 0.25G.
2.
Pay attention to the edge of CR
T
, if the land-
ing is poor
, adjust by attaching the compen-
sation magnet at the back of the CR
T
. (Refer
to figure.)
(South direction Red uniformity) 1
.
Horizontal mf = Set to monocolour screen Red and adjust to - 0.25G.
2.
Pay attention to the edge of CR
T
, if the land-
ing is poor
, adjust by attaching the compen-
sation magnet at the back of the CR
T
.
(The same mothod is aplied for adjustment of
monocolour screen Blue for blue uniformity
,
and changing both the magnetic field for North and South direction.)
*
During the pasting of compensation magnet, use the crosshatch pattern. Make sure there is no blur or bend lines oc- cur
.
If the blur or bend lines are serious, adjust the location of compensation magnet to make it better
.
1
Uniformity adjustment (T
o perform
after the purity and conver- gence adjustment.)
(CR
T
surface)
(CR
T
back)
Miss landing
Compensation magnet