Tektronix TLA 704, Service Manual

Page: 107 / 144

Troubleshooting
6–52
TLA 704 Color Portable Mainframe Service Manual
Table 6–6: BIOS error codes and explanations (Cont.)
Error code Action to be taken Explanation
Parity Check 1 A parity error was found on the communications bus. The
BIOS will return the address of the error or display ???? if it
cannot. Replace the controller board.
Parity Check 2 A parity error was found on the I/O bus. The BIOS will return
the address of the error, or display ???? if it cannot. Replace the controller board.
Press <F1> to resume,
<F2> to Setup This message is displayed after a recoverable error
message. Press the F1 key to restart the boot process, or
press the F2 key to enter the CMOS setup and make
changes to the definitions. This is an informational message. Press the
F1 key to restart the boot process, or press the
F2 key to enter the CMOS setup and make
changes to the definitions. Verify that the CMOS
setup is configured correctly.
Press and hold CTRL-
ALT-F2 to enter SET-
UP This is an optional message that can be turned on and off in
CMOS setup. It is only displayed during a power-on self-test. This is an informational message.
Previous boot incom-
plete - Default configu-
ration used The previous power-on self- test was not successful. If the
power-on self-test fails, it loads default values and displays a
message to run the CMOS setup. If incorrect values are
loaded, future boot attempts may fail. This is an informational message. Verify that the
CMOS setup is configured correctly.
Real time clock error The real time clock may be defective. Replace the controller board.
Shadow Ram Failed at
offset: nnnn The shadow RAM has failed at HEX location nnnn. The system will run without shadow RAM, but it
will run slowly. Exchange the SIMMs; if one of
the SIMMs is defective, the error address
should change.
System battery is dead
- Replace and run
SETUP The CMOS clock may be dead or disconnected. The CMOS
setup may have to be reset. The system battery is internal to the RAM/Cal-
endar component. To replace the system
battery, replace the RAM/Calendar component.
Note:
After replacing the RAM/Calendar component,
you must reflash the BIOS. Refer to Update the
BIOS on page 6–53 and perform the procedures
to reflash the BIOS.
System BIOS shad-
owed 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 check-
sum 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 SIMMs; if one of the SIMMs 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.