Acer V551 Service Manual page 3

Acer V551 (new) CRT Monitor Service Guide
3. Background Adjustment
a. Enter factory area -- Press "SELECT +" and "ADJUST -" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with raster only pattern.
c. Adjust external brightness key to maximum.
d. Check the bias VRs of VR101, 102, 103 at counterclockwise maximum position.
e. Adjust screen VR of FBT to obtain twilight raster about 0.7 to 1.2 Ft-L.
f. See which gun appears first, then adjust the two bias VRs of the other two non-appearing guns to
achieve the color temperature meet specification x=0.281 +/- 0.005
g. Adjust screen VR of FBT again to let the raster about 0.7 to 1.2 Ft-L.
4. Foreground Adjustment
a. Input mode 53.6KHz (SVGA5) with 3-inch block pattern.
b. Check the drive VRs of VR104, 105 at center position.
c. Adjust external brightness key to cut-off and external contrast key to let the light output be 15
Ft-L,
d. Adjust VR103, 104 to let the color temperature meet the specification x=0.281 +/- 0.003
e. Adjust external contrast key to let light output be 45 3 Ft-L.
f. Press "SELECT +" and "ADJUST -" to save the adjustment data.
g. Adjust VR301 to let light output be 31 0.5 Ft-L.
h. Turn power switch off.
5. Final Check
a. Enter final check area -- press "SELECT +" and "ADJUST +" at the same time then turn power
switch on.
b. Input mode 53.6KHz (SVGA5) with full white pattern.
c. Press "SELECT +" and "ADJUST -" keys at a same time.
d. Check the light output is greater than 30Ft.L.
e. Adjust external contrast and brightness keys to minimum, the video and raster should be
disappear.
f. Check the performance of all modes can meet spec.
Chapter 3 Alignment Procedure
y=0.311 +/- 0.005
Confidence and Property
y=0.311 +/- 0.003
3