User guide
3.2 Adjusting Bengal To Its Source
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3.2.2 Adjusting Frequency and Phase
The automatic adjustment for Frequency and Phase is usually good enough. (See 3.2.1 “Adjusting to
Computer Sources” on page 28) If automatic adjustment is not good enough, this is how to do it man-
ually.
Frequency and Phase is adjusted only for computer
sources and must be made using the computer that
has, or will have, program content. It doesn’t work to
make these adjustments using a laptop, then switch
to the ‘real’ computer later for program material.
Making a checkerboard pattern with Paint
You will need to display a checkerboard pattern from
the source computer. You can make one with Win-
dows Paint program.
1. Choose Image > Attributes to open a dialog box.
2. In the Units section, choose pixels. In the Color
section, choose Black and White.
3. Set the Width and Height in pixels to match the
native resolution of the Bengal display.
4. When you click OK, the program gives you a
warning about losing color. Click Yes.
5. At the bottom of the window, click on the check-
erboard pattern. This is the 9th box from the left
on the bottom row.
6. Choose the paint bucket icon and click
in the picture area. It will fill with a
checkerboard pattern.
7. Save this picture as a bit map (.BMP) file
to some location on the hard drive so you
can use it again.
Adjusting frequency manually
1. Press
PICTURE on the remote. This opens the PIC-
TURE menu. See that the Source is Analog 1 or
Analog 2.
2. Display a checkerboard pattern from the com-
puter.
3. Select
FREQUENCY in the menu and use the +/–
arrows to change the frequency. Don’t worry
about the number that appears in the menu. Look
at the screen. As the frequency is moved away
from the ideal setting, more and more vertical
bands will appear in the picture. Adjust Frequency
so there are no vertical bands.
Be sure there are no zoom adjustments in effect when
adjusting frequency. If there are, you will not be able to
get rid of all the vertical bands.
Adjusting phase manually
4. With the checkerboard pattern still on the screen,
select
PHASE in the menu.
5. Adjust the phase with the +/– arrows on the
remote. As the phase changes, at some points you
will notice more horizontal streaking. Find a
point that has no streaking or minimal streaking.
There is usually a fairly broad range of no streak-
ing, so settle for the point in the middle of this
range.