Tektronix 070-9778-03, Service Manual

Page: 88 / 119

Troubleshooting
6–36
TLA 711 Color Benchtop Controller Service Manual
Table 6–9: BIOS error codes and explanations (cont.)
Error code Action to be taken Error code 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. There may be a bad connection between the
benchtop controller and the Benchtop Chassis,
or the benchtop controller is not installed at slot
zero and one.
Turn the power off, remove the benchtop
controller. Inspect the connectors on the rear of
the benchtop controller. Install the benchtop
controller into slot zero and one.
Apply power and re-test.
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. The controller board may be defective.
Replace the benchtop controller.
Press <F1> to resume,
<F2> to Setup This message is displayed after a recoverable error
message. This is a information 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 <F2> to enter
SETUP This is an optional message that can be turned on and off in
CMOS setup. It is only displayed during a POST test. This is a information message.
Previous boot incom-
plete – Default config-
uration used The previous POST test was not successful. If the POST test
fails, POST will load default values then display a message
to run the CMOS setup. If incorrect values are loaded, future
boot attempts may fail. This is an information message.
Verify that the CMOS setup is configured
correctly.
Real time clock error The real time clock may be defective. The controller board may be defective. Replace
the benchtop controller.
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 slow.
Exchange the SIMMs, if one of the SIMMs are
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-
ender component. To replace the system
battery, replace the RAM/Calender component.
Note:
After replacing the RAM/Calendar component,
you must reflash the BIOS. Refer to Update the
BIOS on page 6–37 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 slow.
Reboot 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 redefined. This is an information message.
Reboot the system first, then verify that the
CMOS setup is configured correctly.