Power Problems; Power Supply Lights; Diagnostic Flow For Power Problems - DEC 4000 600 series Owner's Manual

Power Problems

Power This section describes how to troubleshoot the system when
Problems there is no power at the system enclosure or the power supply
subsystem lights indicate power trouble.
Table 9–4 describes possible power problems and their solutions.
The next section, Power Supply Lights, explains how to interpret
the lights.
Table 9–4 Diagnostic Flow for Power Problems
Symptom
No AC power at system. AC
present light is off.
AC power is present, but
system does not power on.
Power Supply The power supply lights on the rear of the system (Figure 9–1)
are used to indicate the status of the components that make up
Lights
the power supply subsystem. Refer to Table 9–5 for information
on interpreting the lights and determining what actions to take
when a failure is indicated.
Action
Check the power source and power cord.
Check the AC circuit breaker setting.
Check the DC on/off switch setting.
Examine power supply subsystem lights to
determine if a power supply unit or fan has
failed, or if the system has shut down due to an
overtemperature condition.
Power Problems
Reference
Figure 9–1,
Table 9–5
Troubleshooting the System 9–5