Extron Electronics MTP 1500RL 15HD A SEQ User Guide - Manual (Page 16)

Skew Delay Compensation
CAT 5, 5e and CAT 6 cable can lead to registration errors between the red, green, and
blue video signals. Pair skew can be measured with test equipment or identified by viewing
a crosshatch test pattern to determine if either the red, green, or blue video image leads
(appears to the left of) the other two video images.
NOTE: Unless the TP cable is changed, the skew adjustment should need to be
made only once, during installation
SEQ receiver skew compensation
The SEQ receivers have built-in skew compensation capabilities. Adjust the equalization as
follows:
1. Set the skew delay to zero for red, green, and blue as follows:
a. Use a Tweeker or other small screwdriver to press and hold the Select button for
3 seconds. The Red, Green, and Blue LEDS all go out.
b. Release the Select button.
2. Use UTP cable test equipment or examine the displayed video image with a critical eye
to determine which video signal (red, green, or blue) is shifted furthest to the right.
NOTE: A crosshatch test pattern or a black background with vertical white lines is
ideal for determining skew.
3. Adjust the furthest left video signal as follows:
NOTE: The SEQ receiver cannot shift the furthest right video image to the left.
a. Use a Tweeker or other small screwdriver to press and release the Select button until
the LED for the left-shifted color (red, green, or blue) lights.
b. Slowly rotate the Adjust control clockwise while monitoring the display. Continue to
rotate the control until that color is properly converged.
NOTE: A 2ns adjustment is very fine. Up to 10ns of delay may be necessary before
a change in the display is detectable. The maximum delay possible is 62ns.
c. Use a Tweeker or other small screwdriver to press the Select button one more time
to save the most recent adjustment or allow the 10-second timeout to elapse.
4. If the remaining color is left shifted, repeat step 3.
MTP 1500RL 15HD A SEQ • Operation 10