Troubleshooting
91369 Service Manual
5-6
Power-ON Diagnostics
Power-ON diagnostic tests verify system hardware integrity during power-ON and can often help isolate and
troubleshoot a problem. Most of these tests can also be initiated using the Extended Diagnostic Mode.
The diagnostics initiated at power-ON are:
• CPU (reads and writes control registers and does an internal wrap-around of one serial communication
controller channel)
• DRAM read/write (reads and writes DRAM above 1 MB)
• Real-time clock (verifies that the clock is running)
• GDS SRAM (reads and writes all of the SRAM, nondestructively)
• PCI bridge (reads and writes control registers)
• ISA bridge (reads and writes control registers)
• Video (tests the video memory, video controller, Hsync, and blue video signals)
• Ethernet (reads and writes control registers)
• Flash checksum (checksums all flash memory)
• Touchscreen (tests the touchscreen controller)
• Audio (reads and writes control registers in the CODEC)
Power-ON diagnostic failures are reported in the upper portion of the
System Startup
screen. Refer to
on page 5-2 for additional information
Any error that occurs during one of these tests is logged in the non-volatile configuration memory. Refer to
on page 5-10 to retrieve the log
Extended Diagnostics
Extended diagnostic tests, like the power-ON diagnostics, can be used to troubleshoot and isolate many
system failures.
The types of tests and features available in the extended diagnostics are:
• Power-ON diagnostics.
• Interactive tests and read/write memory tests that are not appropriate during power-ON diagnostics.
• Touchscreen calibration and data dump utilities.
• System data dump and system reset utilities.
The diagnostic menus allow most of these tests to be run individually or all at once. If Loop mode is activated,
a test(s) can be executed in a continuous loop. If Halt On Error mode is activated, the looping stops when a
diagnostic failure is detected. To avoid false failures, do not use the touchscreen, mouse, or keyboard while
the diagnostic tests are executing.
Extended diagnostics failures are reported in the upper left corner of the
System Startup
screen. Refer to
on page 5-2 for more information.
