XOCECO TK2026, Service Manual

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4
b) adjust focus electrode potentiometer on FBT to optimize B area focus of screen.
4.7 White balance adjustment (color temperature 12000
°
K
±
8MPCD,X=0.270
±
0.008,Y=0.283
±
0.008)
a) receive full white signal, set color is 0
b) select factory menu3
c) on the basis of blue gun ”BD”, select and adjust “RD, GD” item to make white balance
respectively at brightness Y=6cd/m
2
, Y=80cd/m
2
meet standard (color temperature 12000
°
K
±
8MPCD,
x=0.270
±
0.008, y=0.283
±
0.008)
d)If at brightness Y=6cd/m
2,
white balance can not meet standard, you may adjust “RB, GB”item,
then repeat step C) until white balance meet standard.
4.8 Filed scanning adjustment (fig-2)
a) Receive NTSC of A12-PHILIPS test pattern signal.
b) select factory menu1
c) adjust V-SLOPE menu to let the horizontal center line of test pattern above blanking.
d) select V-SHIFT menu and adjust to let the vertical center of picture coincide with
vertical center of picture tube.
e) Select V-SIZE menu and adjust to let the vertical reproduction ratio of picture acceptable 8%.
f) Adjust V.SC to optimise the vertical S correction of picture.
Fig-2 field scan adjustment
4.9 Horizontal scanning adjustment (Fig-3)
a) Receive A12-PHILIPS(NTSC) signal
b) Select factory menu1
c) Select H.SHIFT menu and adjust to let the scanning horizontal center coincide with mechanical
center of picture tube
d) Exit factory menu
4.10 Sub-brightness adjustment
a) Receive A12-PHILIPS(NTSC) signal
b) Select “SB” of factory menu3
c) Adjust “SB” to let things between the sixth and seventh grey scale clear
4.11 OSD adjustment
a) Receive A12-PHILIPS(NTSC) signal
b) Select OSD H and OSD V of factory menu4. Adjust OSD H and OSD V to let OSD at a specified
a
Horizontal line
Under part banking
Fig-3 line scan adjustment