ViewSonic Q51 series Service Manual page 9

B. Gain (window white luminance) adjustment:
(a) Set mode 5 800×600 Fh: 53KHz window white pattern (100mm*100mm window).
(b) Brightness set to raster just cutoff and set the contrast to max.
(c) Adjust G-Gain
5, y=297 ± 5. then save to 9300
(d) Adjust G-Gain
5, y=329 ± 5. then save to 6500.
C. Recheck item A&B to make sure both of them in spec. Finally select OSD function to the 9300°K function, then
press to make the setting data saved in the memory.
D.ABL(Full white luminance) adjustment:
(a) Set mode 5 800×600 Fh: 53KHz full white pattern.
(b) Image Size: H: 270±3mm V: 202±3mm.
(c) Brightness set to raster just cut off and set the contrast to max.
(d) Adjust AB icon to the luminance at 103 ±1cd/m².
Focus Adjustment:
A. Set mode 5 800×600 Fh: 53KHz with character full page.
B. Adjust brightness to center and contrast to max.
C. Then adjust focus VR to a fine vertical and horizontal line.
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.
, B-Gain , R-Gain
, B-Gain , R-Gain
9
, to make color temperaturem Y=140±2 cd/m². x=283 ±
, to make color temperaturem Y=140±2 cd/m². x=313 ±