Agilent Technologies 8753ES Option 011 Service Manual page 304

Service Key Menus and Error Messages
Service Key Menus
Test Patterns Test patterns are used in the factory for display adjustments, diagnostics,
and troubleshooting, but they are not used for field service. Test patterns are executed by
entering the test number (66 through 80), then pressing
The test pattern will be displayed and the softkey labels blanked. To increment to the next
pattern, press softkey 1; to go back to a previous pattern, press softkey 2. To exit the test
pattern and return the softkey labels, press softkey 8 (bottom softkey). The following is a
description of the test patterns.
Table 10-10 Test-Patterns
Test Test Name
Number
66 Test Pat 1
67–69 Test Pat 2–4
70 Test Pat 5
71 Test Pat 6
72 Test Pat 7
73 Test Pat 8
74 Test Pat 9
75 Test Pat 10
76 Test Pat 11
10-14
Displays an all white screen for verifying the light output of the A18 display
and checks for color purity.
Displays a red, green, and blue pattern for verifying the color purity of the
display and also the ability to independently control each color.
Displays an all black screen. This is used to check for stuck pixels.
Displays a 16-step gray scale for verifying that the A19 GSP board can produce
16 different amplitudes of color (in this case, white). The output comes from the
RAM on the GSP board, it is then split. The signal goes through a video DAC
and then to an external monitor or through some buffer amplifiers and then to
the internal LCD display. If the external display looks good but the internal
display is bad, then the problem may be with the display or the cable connecting
it to the GSP board. This pattern is also very useful when using an oscilloscope
for troubleshooting. The staircase pattern it produces will quickly show missing
or stuck data bits.
Displays the following seven colors: Red, Yellow, Green, Cyan, Blue, Magenta
and White.
This pattern is intended for use with an external display. The pattern displays a
color rainbow pattern for showing the ability of the A19 GSP board to display 15
colors plus white. The numbers written below each bar indicate the tint number
used to produce that bar (0 &100=pure red, 33=pure green, 67=pure blue).
Displays the three primary colors Red, Green, and Blue at four different
intensity levels. You should see 16 color bands across the screen. Starting at the
left side of the display the pattern is; Black four bands of Red (each band
increasing in intensity) Black four bands of Green (each band increasing in
intensity) Black four bands of Blue (each band increasing in intensity) Black If
any one of the four bits for each color is missing the display will not look as
described.
Displays a character set for showing the user all 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).
Displays a bandwidth pattern for verifying the bandwidth 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.
EXECUTE TEST
Description
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CONTINUE
Chapter 10