User Manual

13: Checker
Description: Alternating picture areas of black and white in a checkerboard pattern.
Pattern Usage: Checks the regulation of CRT video drive power supply circuits. The pattern produces
abrupt, maximum changes in CRT video drive current. Ideally, this should not cause the voltage supplied
to the video drive circuits to change (good voltage regulation). If the power supply does not have good
regulation, it will cause softening or ringing of the vertical line pattern transitions.
Examples of Uncalibrated Displays: The following 2 images indicate a TV having insufficient power
supply regulation. This effect occurs on CRT type monitors. The corners of each block do not touch each
other as they should. You can sometimes reduce this effect by reducing the Brightness or Contrast
settings.