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Chapter 4—Setup Adjustments
4.8. Uniformity (Shading)
Uniformity adjustments correct inconsistencies and brightness differences in the
CRT and ILA
4.8.1. Sensitivity Uniformity
4-32
NOTE: Threshold Offset can be viewed as the fine adjustment for
Black Level (G2).
3. Repeat the Sensitivity and Threshold Offset adjustments to obtain a
Grey/Pluge pattern where the small, black and small, white square
are just barely visible inside their larger squares.
Repeat the above Black Level, Sensitivity Offset and Threshold Offset
adjustments for Green and Red.
®
assemblies.
Sensitivity sets the brightness at high (white) video levels. Performed
one color at a time, this adjustment gets a flat, uniform brightness in the
white areas.
To adjust the Sensitivity for Blue:
1. Darken the room as much as possible.
2. Use the RGB and H
S
H
HUTTERS ON
IDE
checked.
3. Toggle the RGB
KEY
4. Access V
ARIABLE
5. Use the arrow keys and select a Flat Field level of about 160.
6. Access the
CONVERGENCE MENU
Sensitivity cursor and a window are displayed. The sensitivity level's
data value for the entire screen is displayed—this value is the reset
value of 128 plus or minus the amount of offset from the previous
adjustment.
7. Observe the center of the Flat Field screen. This is the brightest area
of the screen—it is used as a reference to match the rest of the
screen. Avoid overlapping this reference area with the cursor when
adjusting or the reference brightness level could change.
8. Select a 12 X 12 cursor as shown in the cursor size window.
9. Toggle the M
ODE KEY
area of the screen that is not as bright as the reference area
observed in Step 7.
10. Press E
to display the A
NTER
11. Use the arrow keys to bring the darker areas of the screen up to
match the reference area. Avoid making adjustments at the edges of
the cursor. Move the center of the cursor over the area that needs to
be adjusted.
12. Obtain the best possible uniformity over the entire screen, then repeat
Steps 9 - 11 with an 8 X 8 cursor.
to hide R and G. Verify that the
IDE KEYS
box under the S
YSTEMS
to select B only.
F
from the T
P
LAT
EST
and select S
to the M
C
OVE
URSOR
DJUSTMENT
Hughes-JVC Technology Corporation
-P
REFERENCES MENU
.
ATTERN MENU
. The
ENSITIVITY
. Move the cursor to an
C
.
URSOR
is
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