Agilent Technologies 8753ES Option 011 Service Manual page 303

Display Tests These tests return a PASS/FAIL condition. All six amber front panel
LEDs will turn off if the test passes. Press
remain on, the test has failed.
Table 10-9 Display Tests
Test Test Name
Number
59 Disp/cpu com
60 DRAM cell
61 Main VRAM
62 VRAM bank
63 VRAM/video
64 RGB outputs
65 Inten DAC
Chapter 10
Preset
Checks to confirm that the CPU can communicate with the A19 GSP board. The
CPU writes all zeros, all ones, and then a walking one pattern to the GSP and
reads them back. If the test fails, the CPU repeats the walking 1 pattern until
Preset
is pressed.
Tests the DRAM on A19 by writing a test pattern to the DRAM and then
verifying that it can be read back.
Tests the VRAM by writing all zeros to one location in each bank and then
writing all ones to one location in each bank. Finally a walking one pattern is
written to one location in each bank.
Tests all the cells in each of the 4 VRAM banks.
Verifies that the GSP is able to successfully perform both write and read shift
register transfers. It also checks the video signals LHSYNC, LVSYNC, and
LBLANK to verify that they are active and toggling.
Confirms that the analog video signals are correct and it verifies their
functionality.
Verifies that the intensity DAC can be set both low and high.
Service Key Menus and Error Messages
to exit the test. If any of the six LEDs
Description
Service Key Menus
10-13