2–6
Troubleshooting
NOTE
Make sure the monitor has warmed up for at least 20 minutes
before you use Table 2–3.
Table 2–3
Poor Display Quality
Symptom
Possible Cause
Suggested Solution
Poor geometry,
centering, height,
width, and/or
linearity.
Controls on top of the
monitor are out of
adjustment.
See section 4.1.
Local magnetic fields.
Remove any electro-
mechanical devices from
the vicinity of the monitor, or
move the monitor to another
location.
Monitor is out of
adjustment.
Perform the alignment
procedure. Refer to Chapter
4.
Deflection module is
faulty.
Replace the deflection module
(Section 3.2.4).
CRT/chassis assembly
is faulty.
Replace the CRT/chassis
assembly (Section 3.2.6) only
after trying the previous
solutions.
Poor light output
(using the all-white
diagnostic pattern).
The Display is not
bright enough.
The brightness or
contrast control is set
incorrectly.
Adjust the brightness and
contrast controls.
Host system is not
supplying correct
signal levels.
Repair the host system.
GAIN and Cutoff
adjustments may be
incorrect.
Perform the GAIN
adjustment (Section 4.6)
and the Cutoff adjustment
(Section 4.5).
Video casting
assembly is faulty.
Replace the video casting
assembly (Section 3.2.5).
Deflection module is
faulty.
Replace the deflection module
(Section 3.2.4).
