CTX EX951F, Service Manual

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3. White Balance, Luminance adjustment:
A. Bias (Low Luminance) adjustment:
(a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern.
(b) To make the adjustment condition is under the Factory preset window.
Same as step 2-C.
(c) Warm up more than 30 minutes.
(d) Brightness set to maximum. Contrast set to min. full white pattern, then adjust FBT screen
VR to make Y= 4.0 ± 0.5cd/m
2
.
(e) Adjust G-Bias , B-Bias , R-Bias , to make the setting value is(20), then adjust the
R.G.B Bias individual to the color temperature x= 265 ± 10, y= 290 ± 10, Y= 4.0 ± 0.5cd/m
2
.
B. Gain (High light) adjustment:
(a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern.
(b) Brightness set to raster just cut off and set the contrast to max.
(c) Adjust
G-Gain , B-Gain , R-Gain , to make color temperature x=283
±
10, y=297
±
10, Y=140~150 cd/m
2
.
C. Recheck item A&B to make sure both of them in spec. Finally select OSD function to the 9300°K function,
then press the MENU Key. To make the setting data saved in the memory.
D. The adjustment of 6500°K white Balance, May follow step A ~ C , with the x=313
±
10, y=329
±
10,
Y=140~150 cd/m
2
.
E. Full white luminance:
(a) Set mode 5 1024 x 768 Fh: 68.7KHz full white pattern.
(b) Image Size : H:346
±
4mm V:260
±
4mm.
(c) Brightness set to raster just cut off and set the contrast to max.
(d) Adjust VR701 to the luminance at 90~95 cd/m
2
.
4. Focus Adjustment:
A. Set mode 5 1024 x 768 Fh: 68.7KHz with character full page.
B. Brightness to cut off and contrast to max.
C. Then adjust focus VR1 to a fine vertical line.
D. Adjust focus VR2 to a fine horizontal line.
E. Repeat step C & D..
5. Purity Adjustment
A. Be sure that the display is not being exposed to any external magnetic fields.
B. Ensure that the spacing between the Purity, Convergence, Magnet, (PCM), assembly and the CRT stem is
29mm .(See below diagram)
C. Produce a complete, red pattern on the display. Adjust the purity magnet rings on the PCM assembly to
obtain a complete field of the color red. This is done by moving the two tabs in such a manner that they
advance in an opposite direction but at the same time to obtain the same angle between the two tabs, which
should be approximately 180'.
D. Check the complete blue and complete green patterns to observe their respective color purity. Make minor
adjustments if needed.