HP Apollo 9000 400dl, Servicing Manual

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Fault Isolation 4-15
On a standalone system, you can run the Self Test diagnostics that reside on the Boot
ROM; if a disk exists, you can also run Loadable Tests (the part of Self Test that re-
sides in the /SAU directory), TSC, and SAX.
If a system is diskless, you can boot Loadable Tests, TSC, and SAX from another disk
on the network. If the diskless system is running Domain/OS, you can also run SAX by
logging onto a remote system (using the crp command).
If the system display is inoperative, you can access Self Test, TSC, and SAX by using
the serial line connected either to a terminal (TTY) or to a workstation that emulates a
terminal (EMT). Refer to Appendix D for information about using TTY and EMT.
Table 4-1 lists the primary methods to access diagnostics and where these diagnostics
are stored.
Table 4-1. Methods To Access Diagnostics
Method of Access Diagnostics Location
Standalone System, Diskless Self Test Boot ROM
Standalone System, Disk
or
Network (diskless booting, crp)
or
Serial Line (TTY, EMT)
Self Test
Loadable Self Tests
TSC
SAX Boot ROM
/SAU directory
/SAU directory
/systest directory
Figure 4-10 illustrates the relationships between diagnostics, with respect to their
physical locations, and shows the sequence in which they load.