Computer Troubleshooting - Digital Equipment VENTURIS 575 Service Maintenance Manual

Troubleshooting
POST and Boot Messages
nnnn Shadow RAM passed
System battery is dead Replace
and run SETUP
System BIOS shadowed
System cache error - Cache
disabled
System CMOS checksum bad -
run SETUP
System RAM failed at offset:
nnnn
nnnn System RAM passed
System timer error
UMB upper limit segment
address: nnnn
Video BIOS shadowed

Computer Troubleshooting

Problem Possible Cause
No response Main logic board failure.
when the
computer is Main logic board jumpers
incorrectly set.
turned on
CPU has failed.
Did not rerun BIOS Setup utility.
Computer
operates
BIOS Setup utility changes not
incorrectly after
installing saved before exiting.
optional SIMMs
SIMMs have failed.
64
(continued)
Where nnnn is the amount of shadow RAM (in kilobytes) that tested
successfully.
Replace the battery and then run the BIOS Setup utility to restore
previous configuration information.
This indicates that the computers BIOS was successfully copied to
shadow RAM.
RAM cache failed.
Run the BIOS Setup Utility and restore all settings to original values.
If the problem persists replace the defective component.
Run the BIOS Setup Utility and ensure that all settings are correct.
Save the configuration even if no changes have been made. If the
problem persists replace the defective component.
System RAM failed.
Run the BIOS Setup Utility and restore all settings to original values.
If the problem persists replace the defective component.
Where nnnn is the amount of system RAM (in kilobytes) that tested
successfully.
The computers timer test failed.
Run the BIOS Setup Utility and restore all settings to original values.
If the problem persists replace the defective component.
Displays the address of the upper limit of UMB. This indicates the
released segments of the BIOS that can be reclaimed by a virtual
memory manager.
This indicates that the computers video BIOS was successfully copied
to shadow RAM.
Action
Replace main logic board.
Set all appropriate jumpers. Refer to "Main logic
board jumpers".
Replace CPU.
Rerun BIOS Setup utility.
Rerun BIOS Setup utility and save changes.
Remove SIMMs and reinstall
Make sure banks 1 and 2 are filled with the correct
SIMM size, speed and type.
Replace SIMMs.
Digital VENTURIS Pentium PC
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