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Display system troubleshooting

The 810/820 system display control is mainly composed of CRT, video board and other components. The function of the CRT is to convert video signals into images for display; the function of the video board is to convert characters and image lattice into video signals for output.

When a CRT fails, the following phenomena generally occur:

1) There is no display on the screen and the system cannot be started. When you press and hold the diagnostic key on the system panel (the key with the “eye” mark) to power on the system, the four indicators above the panel flash when the system starts:

2) The screen displays a horizontal or vertical bright line;

3) The left and right images of the screen are deformed;

4) The upper and lower lines of the screen are inconsistent, either compressed or expanded;

5) The screen image is tilted or shaken.

The above faults are generally caused by defects in the display drive circuit. During maintenance, the display drive circuit should focus on inspection.

When the video board fails, the following phenomena generally occur:

1) There is no display on the screen and the system cannot be started. When you press and hold the diagnostic key on the system panel (the key with the “eye” mark) to power on the system, the four indicators above the panel will flash when the system starts up;

2) The screen image is incomplete;

3) The monitor has raster, but there is no image on the screen.

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