Specifications

COMPAQ PORTABLE 286 Personal Computers will operate properly at a speed
within plus or minus 2 percent of the specified value. However, it is good
practice to adjust the speed to within plus or minus 1 percent of the
specified value.
6. After you adjust the diskette drive speed, press any key to exit from the
test program.
7. Turn off the system power, remove the diskette drive power and signal
extension cables, and reinstall the diskette drive.
Chapter 8.11 Video Display Unit Adjustment Procedure
The video display unit adjustment (also referred to as CRT adjustment)
provides the method for performing any required video display adjustment. To
complete the adjustment procedure, the following equipment is required.
o All tools required to service a COMPAQ Portable, COMPAQ PLUS, or COMPAQ
PORTABLE 286 Personal Computer. For a listing of these tools, see the
"Foreword" of this guide.
o COMPAQ DIAGNOSTICS Diskette latest version.
o Set of standard television adjustment tools.
o Personal Computer Display Template (PN 100686-001 (No longer available)).
Read the entire procedure carefully and completely before starting any work.
Be sure to complete each step before continuing to the next step.
1. Remove the outer access cover. See Chapter 7, "Removal and Replacement
Procedures."
2. Place your computer in a standard working position with the outer access
cover removed.
3. Insert the DIAGNOSTICS diskette in the computer and load the DIAGNOSTICS
program. (See Chapter 4, "DIAGNOSTIC Procedures," for more information
on the Advanced Diagnostics program.)
4. Select the video display alignment procedure from the video display unit
test menu and press ENTER.
After you select the video display adjustment procedure, the screen will
appear completely blank. This is normal program operation.
5. Turn the external BRIGHTNESS knob (located on the front bezel) fully
clockwise.
6. Before making any adjustments, become familiar with Figure 8.11-1, which
shows the locations of controls on the high voltage access plate.