Tektronix TLA 714, Service Manual

Page: 113 / 159

Troubleshooting
4–66
TLA 714 Color Portable Mainframe Service Manual
Table 4–6: BIOS error codes and explanations (Cont.)
Error code Action to be taken Explanation
Keyboard error nn There may be a stuck or defective key.
The BIOS returns the address of the key where HEX nn is
the address of the key.
Swap keyboard with a known good
keyboard.
Monitor type does not match
CMOS - Run SETUP The monitor type may be defined incorrectly in SETUP. Verify that the monitor type is defined
correctly in the CMOS setup.
Operating system not found The operating system cannot be found.
The replaceable hard disk drive is not present.
The replaceable hard disk drive is jumpered as a slave
drive, and a fixed (master) hard disk drive is not present.
Insert a bootable disk into the floppy disk
drive and try to reboot.
Reload the Windows operating system.
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 SETUP 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 incomplete -
Default configuration 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 SO
DIMMs; if one of the SO DIMMs is defec-
tive, 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/Calendar component. To replace the
system battery, replace the RAM/Calendar
component.
Note:
After replacing the RAM/Calendar compo-
nent, you must reflash the BIOS. Refer to
Update the BIOS on page 4–67 and perform
the procedures to reflash the BIOS.