Power Problems; Troubleshooting Power Problems - DEC AlphaServer 2100 Owner's Manual

Power Problems

Power Problems
This section describes how to troubleshoot the system when
there is no power at the system enclosure or when the power
supply subsystem lights indicate power trouble.
Table 4–5 Troubleshooting Power Problems
Symptom
No AC power. as indicated
by AC OK light on the power
supply when the AC On/Off
switch is set to ''on.''
AC power is present, but
system does not power on.
Power supply shuts down
after approximately 5 seconds
(fan failure).
4–10 Troubleshooting the System
Action
• Check the power source and power cord.
• Check that the left panel is properly secured.
A safety interlock switch shuts off power to the
system if the panel is open.
• If there are two power supplies, make sure both
have the AC On/Off switch set to ''on'', or that both
power supplies are plugged in (systems with no AC
On/Off switches).
• Check the DC On/Off button setting on the operator
control panel.
• Check that the ambient room temperature is within
environmental specifications (10–35°C, 50–95°F)
Using a flashlight, look through the front (to the left
of the internal StorageWorks shelf) to determine if the
6.75-inch fan is spinning at power-up. A failure of the
6.75-inch fan causes the system to shut down after
approximately 5 seconds.