Compaq Portable II Maintenance And Service Manual page 118

o If the vertical linearity control does not exist on your video display
unit, it is preset and controlled by the video display unit.
o Step 13 and 14 should be repeated after each adjustment until the
character height are equal.
17. If your display is shifted to the right or left, a horizontal display
centering adjustment is necessary.
centering of the display.
which shifts the display in both a high and low resolution mode.
other one is the high scan video center potentiometer, which affects the
display in high resolution mode.
of both the master video center and high scan video center control
potentiometers.)
NOTE: Do not use excessive force when making adjustments on the video
display unit.
18. Use the CTRL + ALT + < command to place the display in the low
resolution graphics mode.
video center control potentiometer so that the display is in the center
of the screen.
19. Use the CTRL + ALT + > command to place the display in the high
resolution mode.
center control potentiometer so that the display is in the center of the
screen.
If your display experiences a problem other than those covered in the
previous 19 steps, replace the video display unit.
For video display unit removal and replacement procedures, refer to Chapter 7
in this guide.
Two potentiometers control the
One is the master video center potentiometer,
(Refer to Figure 8-26 for the locations
Use the adjustment tool, and adjust the master
Using the adjustment tool, adjust the high scan video
The