Diagnostic Flow For Power Problems; Diagnostic Flow For Problems Getting To Console Mode - DEC 4000 AXP Service Manual

Table 1–2 Diagnostic Flow for Power Problems
Symptom
No AC power at system
as indicated by AC
present LED.
AC power is present, but
system does not power
on.
Table 1–3 Diagnostic Flow for Problems Getting to Console Mode
Symptom
Power-up screens (or
console event log) are
not displayed.
Action
Check the power source and power cord.
Check the system AC circuit breaker
setting.
Check the DC on/off switch setting.
Examine power supply subsystem LEDs
to determine if a power supply unit
or fan has failed, or if the system has
shut down due to an overtemperature
condition.
Action
Check OCP LEDs for a failure during
self-tests. If two OCP LEDs remain lit,
either option could be at fault.
Check baud rate setting for console
terminal and system. The system default
baud rate setting is 9600.
Try connecting the console terminal to
the auxiliary console port.
Note: No console output is directed to
the auxiliary console port untill the
power-up self-tests have completed and
you press the Enter key or Ctrl/x.
For certain situations, power up under
robust mode to bypass the power-up
script and get to a low-level console.
From console mode, you can then edit the
nvram file, set and examine environment
variables, or initialize individual phases
of drivers.
Reference
Section 2.1.1
Reference
Section 2.1.2
Section 6.5
Section 2.2.3
System Maintenance Strategy 1–5