Troubleshooting Procedures - Sun Microsystems SPARC classic Service Manual

4
C H A P T E R

Troubleshooting Procedures

This chapter describes how to troubleshoot SPARCclassic and SPARCstation LX
system problems. Each problem is described, and a set of procedures is provided for
a solution to the problem.
Section 4.1 "No Video Output on the System Monitor"
Section 4.2 "Power-On Does Not Succeed"
Section 4.3 "Disk Drive Errors"
Section 4.4 "Determining Faulty DSIMM Locations"
TABLE 4-1
solving them.
TABLE 4-1
Problem
LED on front of system is not lit.
Disk drive fails to boot or does not
respond.
Operating system does not
recognize disk drive at boot up.
No video output on monitor.
describes commonly encountered troubleshooting problems, and tips for
Troubleshooting Tips
Action
Verify that the power switch is turned on and that the power cord is
connected. If both the power switch and the power cord are connected,
shut down the system and verify that the LED cable is connected. If the
LED cable is connected, the power supply is defective. Replace the power
supply. See Chapter 8 "Major Subassemblies."
Shut down the system. The SCSI controller may be defective. See
Section 4.3.1 "Verifying the Built-In SCSI Controller." If the SCSI
controller is OK, verify that SCSI ID jumpers are set correctly and that
every disk drive on the SCSI bus is set to a different SCSI address. Verify
that the configuration jumpers on the disk drive are set correctly. See
Chapter 9 "Storage Devices."
Shut down the system. Verify that SCSI ID jumpers are set correctly and
that every disk drive on the SCSI bus is set to a different SCSI address.
Verify that the configuration jumpers on the disk drive are set correctly.
See Chapter 9 "Storage Devices."
Verify that the power cord is connected. Use a Volt Ohmmeter (VOM) to
check voltages. See Section 4.1 "No Video Output on the System
Monitor."
4-1