Runco Video Xtreme VX-40d Owner's Operating Manual page 53

AUTO INPUT LEVEL – Keep off for virtually all sources (default). Temporarily enter a
checkmark only if you are an experienced user and you have an unusual source that
you feel needs further color temperature and/or input level adjustment. After entering a
checkmark, wait for the six slidebar values to stabilize, then delete the checkmark and
exit. This compensates for incoming out-of-range drives (white) and blacklevels (black)
that would cause "crushing" of light and dark colors in the image.
BLACK LEVELS AND DRIVES - To check your image and adjust these controls:
1. Make sure overall "Contrast" and "Brightness" settings are both set to near 50.
NOTE: Not required for "Auto" adjustment.
• Contrast = 50 (approx.)
• Bright = 50 (approx.)
2. Check the color temperature setup using an internal grayscale test pattern,
making sure to obtain a neutral grayscale. NOTE: Not required for "Auto"
adjustment.
3. Confirm that you are using an analog source not connected to INPUT 3 or INPUT
4, as Input Levels are not applicable for digital sources or sources going through
the decoder. A grayscale is recommended.
4. If the blacks and/or whites appear OK, input levels do not need adjustment. If
black levels are too high (and/or whites are too low, which is rare), you likely have
a noisy source that is producing skewed input levels. Continue with Step 5.
5. Temporarily enable "Auto" in the Input Levels submenu. Wait for all 6 values to
stabilize. Alternatively, do not use "Auto"—reduce blacklevels manually instead.
Judge by eye and change one or more of the six levels as necessary to obtain
proper blacks and whites. You may want to see only a certain color while
adjusting—use the "Color Enable" option (described below).
6. Delete the "Auto" checkmark and leave the Input Levels menu.
AUTO COLOR ENABLE – When a checkmark is present, selecting a specific blacklevel
or drive to adjust will automatically enable the corresponding color in the display. Delete
the checkmark to see all colors.
CLAMP LOCATION – This option (formerly known as sync tip
clamping) can brighten the image produced from certain high-
resolution, high-frequency graphic sources. For almost all sources,
the best clamp location is automatically selected by the projector.
Use the normal Back Porch location if the image is either sufficiently bright or overly
bright. Select Sync Tip if the image appears unusually dim, if there are horizontal streaks
across the image, or if there is significant color drift. This moves the clamping pulse from
the normal back porch location (which is likely too short) to the tip of the horizontal sync
pulse. Tri Level is typically recommended for an HDTV source where the back porch is
also short.
NOTE: Clamp Location is not used for video sources or any RGB source with sync
information included on the video (e.g., sync-on-green). Use Tri Level instead.
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Section 3: Operation