Acer AF715 Series Service Manual page 11

3. White Balance, Luminance adjustment:
A. Bias (Low Luminance) adjustment:
(a) Set mode 5 1024×768 Fh: 68.6KHz 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 center. Contrast
Y= 0.18 ± 0.03cd/m
(e) Make the setting value of B-Bias
50DAC, then adjust FBT screen G2 VR and the R.B. Bias individual to the color temperature x= 260 ± 10, y=
290 ± 10,Y=0.18±0.03cd/m
(f) Select OSD function to the 9300°K and 6500°K function individually, then press the MENU Key to make the
setting data saved in the memory.
B. Gain (High light) adjustment:
(a) Set mode 5 1024×768 Fh: 68.6KHz 1/3 white area(100mmX100mm Window).
(b) Brightness set to 50DAC and set the contrast to max.
(c) Adjust G-Gain
10,Y=140 ±10cd/m
C. 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 B ~ C , with the x=313 ± 10, y=329 ± 10,
2
.
±10cd/m
E. Selet "SB" Function to ON.
F. The adjustment of 9300°K(SBQ) white blance may follow B~C with the x=283±10, y=297±10,Y≥280cd/m
G. The adjustment of 6500
H. Select "SB" function to OFF and Exit factory preset model.
I. Full white luminance:
(a) Set mode 2 640×480 Fh: 68.6KHz full white pattern.
(b) Image Size : H:310±4mm V:232.5±4mm.
(c) Brightness set to 50 DAC and set the contrast to max.
(d) Adjust VR701 to the luminance at 105±5cd/m
4. Focus Adjustment:
A. Set mode5 1024×768 Fh: 68.6KHz with character full page.
B. Adjust brightness to center 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.
All manuals and user guides at all-guides.com
set to max. raster pattern, then adjust FBT screen G2 VR to make
2
.
and R-Bias
2
.
, B-Gain , R-Gain
2
.
o
K (SBQ) white Balance, May follow B~C with the x=313±10,y=329±10，Y≥260cd/m
2
.
10
to 20DAC, keep the value of G-BIAS
, to make color temperature x=283 ± 10,
to
y=297 ±
Y=140
2
.
2
.