For
HP
Internal Use Only
Troubleshooting the Power System
If
none
of
the
front panel LEDs are
lit,
DC power is absent
and
AC power is possibly absent.
Note
•
The
system uses
an
auto-ranging power supply.
If
a severe line
transient
occurs when
the
system is being powered up,
the
power supply
may
attempt
to
operate
in
the
220 VAC range.
If
this occurs
and
the
line voltage is 110
VAC,
the
system will
not
power up correctly. Do
the
following:
1.
Place
the
power switch
in
the
OFF
position.
2.
Unplug
the
system line cord for one minute.
3.
Plug
in
the
system line cord
and
power
up
the
system.
Check for AC power
and
then
DC power source by following
the
procedure below
until
the
problem is solved.
Note
•
If
the
system
appears
to
function correctly, e.g.,
Operating
System
prompts
are
returned
on a user
terminal
if
(Return) is pressed,
and
there
are no front
panel LEDs on,
the
LEDs
on
the
backplane have probably failed.
The
backplane should
be
replaced
at
a convenient time.
Table 5-3. Power System Troubleshooting Procedure
CAUSE/SYMPTOM
ACTION
1.
System powered on?
Depress
the
power switch
and
check
the
front panel LEDs.
2.
PowerTrust UPS installed? No. Skip
to
Step
3.
Yes. Continue with this step.
a. Check
that
the
power
output
cable is connected from
the
PowerTrust UPS
output
receptacle
to
the
system
AC
input
receptacle.
Check
that
the
AC
power cord from
the
PowerTrust UPS is
plugged into
the
AC
power source receptacle. Set
the
PowerTrust
UPS
output
switch
to
the
ON position.
b. Connect
the
power cable
to
a different
output
receptacle on
the
PowerTrust UPS. Try each PowerTrust UPS
output
receptacle.
c.
Disconnect
the
power cable from
the
system
AC
input
receptacle. Disconnect
the
AC
power cord from
the
PowerTrust
UPS,
connect
it
to
the
system
AC
input
receptacle,
and
then
plug
it
into
the
AC
power source.
If
the
front panel LEDs are lit, replace
the
PowerTrust UPS.
Otherwise,
continue
to
Step 3.
3.
Tripped circuit breaker?
Check for
AC
power
at
the
power source. Plug another device
into
the
receptacle.
Check
the
circuit breaker or breaker panel. Reset
the
circuit
j breaker if necessary.
Troubleshooting 5-5
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