Tektronix TLA 714, Service Manual

Page: 114 / 159

Troubleshooting
TLA 714 Color Portable Mainframe Service Manual
4–67
Table 4–6: BIOS error codes and explanations (Cont.)
Error code Action to be taken Explanation
System BIOS shadowed The system BIOS was copied to shadow RAM. This is an informational message. No action
needs to be performed.
System cache error - Cache
disabled When the system BIOS failed the cache test, the cache
was disabled. The system will run without cache RAM, but
it will run slowly. Try rebooting the system.
System CMOS checksum
bad - run SETUP The system CMOS settings may be incorrect or modified
incorrectly by some application.
The CMOS setup may have to be re-defined.
This is an informational message. Reboot
the system, and then verify that the CMOS
setup is configured correctly.
System RAM Failed at
offset: nnnn The system RAM at HEX address nnnn may be defective. Exchange the SO DIMMs; if one of the
SO DIMMs is defective the error address
should change.
System timer error The BIOS failed the timer test. The controller board may be
defective. Try rebooting the system first. If this
message keeps reappearing, replace the
controller board.
Update the BIOS Version
On rare occasions it may be necessary to update the controller BIOS version. In
most cases this is only necessary to activate enhancements to the product.
To update the BIOS, you will need the latest version of BIOS available on floppy
disk. Refer to your TLA 714 and TLA 720 Installation Manual.
The BIOS version is briefly displayed on boot up of the portable mainframe. To
verify the BIOS version number, power on the portable mainframe and watch the
upper left hand section of the screen. A message will be displayed as below:
Copyright 1996 By RadiSys Corporation. Version 2.xx.xx.
RadiSys boot block version 2.xx.xx
Before continuing, verify that the BIOS version that is displayed is an older
version than the version you are installing. The version number is listed on the
software floppy diskette.
Run the QA+Win32 diagnostic software to verify that all of the functions of the
controller are functioning correctly.
After running the QA/Plus/WIN diagnostics, quit the application by selecting
Restart MS Windows
, and clicking the
OK
button. This guarantees that the
TLA 700 returns to a stable state for normal operation.
Verify the BIOS Version
Verify Operation