Agilent Technologies HP 8719D Service Manual page 280

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the different types and sizes of characters available. Three sets
of characters are drawn in each of the three character sizes. 125
characters of each size are displayed. Characters 0 and 3 cannot be
drawn and several others are really control characters (such as carriage
return and line feed).
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of the EXTERNAL display. It consists of multiple alternating white and
black vertical stripes. Each stripe should be clearly visible. A limited
bandwidth would smear these lines together. This is used to test the
quality of the external monitor.
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an oscilloscope. It is similar to the 16 step gray scale but is repeated 32
times across the screen. Each of the 3 outputs of the video palette will
then show 32 ramps (instead of one staircase) between each horizontal
sync pulse. This pattern is used to troubleshoot the pixel processing
circuit of the A19 GSP board.
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accuracy of the color convergence of the external monitor.
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for testing color convergence, linearity,and alignment. This is useful
when aligning the LCD display in the bezel.
10. Displays a character set for showing the user all
11.
Displays a bandwidth pattern for verifying the bandwidth
Displays a repeating gray scale for troubleshooting, using
Displays a convergence pattern for measuring the
Displays crosshatch and inverse crosshatch patterns
Service KeyMenusandErrorMeseages lo-21