NEC VT440 Service Manual page 63

METHOD OF ADJUSTMENTS
4-6. Option
<Power>
Used for Power ON/OFF.
When ON/OFF is selected, the power supply is turned ON and OFF.
<Input Select>
Used for input changeover.
The input line is changed over to the selected input.
<Test Pattern>
Used to display the various internal test patterns.
[Flicker]: Horizontal line signal for flicker adjustment
[Ghost]: Signal for ghost adjustment
[Scale]: 16-gradation horizontal gray scale
[Cross]: Cross hatch
[100% Raster]: All-white raster
[50% Raster]: 50% brightness raster
[25% Raster]: 25% brightness raster
[0% Raster]: All-black raster
[CLS]: Test Pattern clear (Changed over to RGB1 input)
[R]/[G]/[B]: Test Patterns appearing in checked color except for [Ghost]
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