NEC Express 5800/120Lg, Service Manual, Page: 8 / 204

vi Contents
Preparing the System for Diagnosing Problems ....................................................5-8
Monitoring POST ..................................................................................................5-9
Verifying Proper Operation of Key System Indicators .......................................5-10
Confirming Loading of the Operating System ....................................................5-10
Specific Problems and Corrective Actions .......................................................................5-11
Power LED Does Not Light ........................................................................................5-11
Incorrect or No Beep Code..........................................................................................5-11
No Characters Appear on Screen ................................................................................5-12
Characters are Distorted or Incorrect ..........................................................................5-12
System Cooling Fans Do Not Rotate...........................................................................5-12
Diskette Drive Activity LED Does Not Light .............................................................5-13
CD-ROM Drive Activity Light Does Not Light .........................................................5-13
Problems with Application Software...........................................................................5-13
Bootable CD-ROM Is Not Detected............................................................................5-14
Problems with the Network ..............................................................................................5-14
Plug and Play Installation Tips .........................................................................................5-14
Error Messages .................................................................................................................5-15
POST Error Codes and Messages................................................................................5-15
POST Error Code Hardware References .....................................................................5-20
Beep Codes..................................................................................................................5-21
How to Identify BIOS and BMC Revision Levels ...........................................................5-22
Lamps ...............................................................................................................................5-23
LAN ACCESS Lamp ..................................................................................................5-23
STATUS Lamp............................................................................................................5-23
POWER/SLEEP Lamp................................................................................................5-25
DISK ACCESS Lamp .................................................................................................5-25
Access Lamps..............................................................................................................5-25
Hard Disk Drive Lamp ................................................................................................5-26
Power Supply Lamps...................................................................................................5-27
DC Power Lamp ..........................................................................................................5-27
Power Status Lamp......................................................................................................5-27
AC Power Lamp ..........................................................................................................5-27
LAN Connector Lamps ...............................................................................................5-28
6. Illustrated Parts Breakdown
Exploded View ...................................................................................................................6-2
Field Replaceable Units......................................................................................................6-3
Pentium Processors........................................................................................................6-5
Replaceable Parts...................................................................................................6-5
Hard Disk Drives...........................................................................................................6-5
Replaceable Parts...................................................................................................6-5
DVD Drives...................................................................................................................6-5
Replaceable Parts...................................................................................................6-5
DAT Tape Drives ..........................................................................................................6-5
Replaceable Parts...................................................................................................6-5
RAID Controllers and Cache ........................................................................................6-6
Replaceable Parts...................................................................................................6-6
SCSI Controllers............................................................................................................6-6
Replaceable Parts...................................................................................................6-6
Network Controllers ......................................................................................................6-6
Replaceable Parts...................................................................................................6-6
Memory Expansion .......................................................................................................6-6
Replaceable Parts...................................................................................................6-6