Ghost - NEC VT440 Service Manual

METHOD OF ADJUSTMENTS

4-4. Ghost

<Ghost R/G/B>
This function is used for the adjustment of Ghost.
The present PJ data are acquired and displayed on the screen.
The data acquired firstly (at the time of starting of the adjusting software) are stored as the initial value and
displayed on the left of the arrow mark. The present value is displayed on the right of the arrow.
When writing of the ADJ data is conducted with [Data], however, the written data are regarded as the initial
value.
The data come in 4 types for each color. During the adjustment, the increment and decrement actions are
carried out simultaneously for these 4 types.
Display the Test Pattern, and make adjustments with the use of the scroll bar so that Ghost becomes mini-
mum in the half-tone area on the right of the pattern, for R/G/B, respectively.
Adjusting range: "VT540" 00H - 2FH
"VT440" 00H - 17H
<Test Pattern>
This function is used when an internal Test Pattern is displayed for ghost adjustment.
When the [ON] button is clicked, an adjusting signal of Ghost is displayed on the projected screen.
When the [CLS] button is clicked, the Test Pattern is cleared (input changeover to RGB1).
<Data>
When the [Set] button is clicked, the adjusting signal of Ghost adjusted with the scroll bar is written in the
Flash ROM.
When the [Reset] button is clicked, the adjusted ghost value is restored to the initial value (at the time of
starting of the adjusting software) and written in the Flash ROM.
Note 1: The data adjusted with the scroll bar are the temporary ones. They are not sustained in the PJ without
taking any measures. Execute [Set] and write the data in the Flash ROM.
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