AT&T PC 6300 - Page 186

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If jagged lines appear on the display; —
• Make sure jumper A on the VDC is correctly installed.
• Make sure jumper C is set correctly. The correct setting m
depends on the type of personal computer (Figure 3-51). For
the PC 6300, the jumper should be from 1 to 2.
If garbled display:
• Make sure jumper A on the VDC is correctly installed.
If application software indicates a wrong monitor is connected
(monochrome instead of color or vice versa):
• Make sure jumper A on the DEB is set correctly. Run the
"Customer" diagnostic, and it will show whether the system
is identifying the monitor as color or monochrome. If
"Customer" shows a monochrome system when a color
monitor is attached, then the monitor may be at fault.
If color bar pattern is not correct:
• Adjust the contrast and/or brightness controls on the
monitor. As on a color TV, these controls can seriously
affect the color displayed.
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