DEC AlphaServer 2100, Owner'S Manual, Page: 144 / 192

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 Action
No AC power. as indicated
by AC OK light on the power
supply when the AC On/Off
switch is set to ‘‘on.’’
• 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).
AC power is present, but
system does not power on.
• 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)
Power supply shuts down
after approximately 5 seconds
(fan failure). 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.
4–10 Troubleshooting the System