Service manual

6. ADJUSTMENT
Service Manual CNS-9701 6.1
When a CRT display unit is used with a personal computer, adjustment of the CRT
display unit is not required. However, when an LCD display unit is used with a
personal computer, adjustment at the LCD display unit is usually required for clear
screen display.
Newer LCD display units have automatic screen adjustment which handles the
RGB output signals from most personal computers within an acceptable range. To
more clearly display the screen, the LCD display units also have manual screen
adjustment. The VL-971R display unit has both automatic and manual screen
adjustments.
This display unit accepts the analog RGB signals. The red, green and blue primary
color signals are individually input to the display unit. The combination of
primary colors makes the different colors as shown below.
According to the above table, you can judge which primary color has something
wrong when a color problem occurs.
For example, if the display color which should be white is yellow, the blue color
signal has a problem. However, to specify which part, i.e. display unit, main unit or
cable between them, has a problem, you have to replace the unit or cable with a
known good compatible unit or cable one at a time.
When the screen display is not normal, do the following procedure so that the
screen display settings are automatically adjusted. Refer to “LCD Unit VL-971R/
RK” of the “Panel Descriptions” in Section 1.
1. Check that the RGB signals are input to the display unit.
2. Press the S (Video Source) button on the rear of the display unit. The
adjustment window appears on the screen.
3. Check that “Computer” is selected in the window and highlighted in yellow.
4. Press the Down/Left button twice. The screen display settings such as the
horizontal and vertical synchronization settings are automatically adjusted.
If the RGB signals are poor or the RGB output signals from the main unit are
not appropriate for the display unit, manual adjustment is also required.
Adjusting the VL-971R Display Unit
Code Display Color Combination of Primary Color(s)
1 Blue Blue
2Red Red
3 Purple Blue and red
4 Green Green
5 Light blue Blue and green
6 Yellow Red and green
7 White Blue, red and green
Automatic Adjustment