Tektronix TLA 704, Service Manual

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Troubleshooting
TLA 704 Color Portable Mainframe Service Manual
6–51
BIOS Setup Error Messages
The portable mainframe runs a BIOS test when it boots up. If the BIOS test
encounters a problem, the program displays the error on the display. Table 6–6
lists the error codes, an explanation of each error code, and actions that can be
taken. Refer to the TLA 700 Series Installation Manual for information on BIOS
setup parameters and feature settings.
Table 6–6: BIOS error codes and explanations
Error code Explanation Action to be taken
Diskette drive A error The BIOS test recognizes the presence of the floppy disk
drive, but the floppy disk drive fails the power-on self-test.
The floppy disk drive may be defined incorrectly in the
CMOS setup. The floppy disk drive may not be connected
correctly on the adapter board. Verify the floppy disk drive is configured
correctly in the CMOS setup.
Verify that the floppy disk drive cable is
connected on the floppy disk drive and the
adapter board.
Extended RAM Failed
at offset: nnnn The extended memory may not be configured correctly or
the extended memory is defective at HEX address nnnn. Verify that the extended memory is configured
correctly in the CMOS setup.
Exchange the SIMMs; if one of the SIMMs is
defective the error address should change.
Failing Bits: nnnn The RAM address mapped to HEX nnnn in the system,
shadow, or extended memory has failed. A 1 in the map
indicates a failed bit. Exchange the SIMMs; if one of the SIMMs is
defective the error address should change.
Fixed Disk 0 Failure
(or)
Fixed Disk Controller
Failure The hard disk drive may not be defined correctly in the
CMOS setup. The hard disk drive may not be connected
correctly. The hard disk drive may be defective. Verify the hard disk drive is configured correctly
in the CMOS setup.
Verify that the hard disk drive cable is con-
nected on the hard disk drive and on the
adapter board.
Replace the hard disk drive and reinstall the
TLA 700 Series software.
Incorrect Drive A Type
- run Setup The floppy disk drive may not be defined correctly in the
CMOS setup. Verify the floppy disk drive is configured
correctly in the CMOS setup.
Invalid NVRAM media
type The BIOS cannot access the NVRAM. Replace the controller board.
Keyboard controller
error The keyboard controller may be defective. Swap keyboard with a known good keyboard.
Keyboard error The keyboard may be missing or defective. Swap keyboard with a known good keyboard.
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. Insert a bootable disk into the floppy disk drive
and try to reboot.
Reload the Windows 95 operating system.