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HP 3242lA Series III Power Supplies
The undervoltage
sensing circuits also provide power supply con-
trol signals
for use when mul tiple supplies are
"control paral-
leled"
in a computer system.
These signals are Power Supply Up
(PSU), Line Power Up (LPU), and control
common~.
PSU indicates
that the dc output voltages are above specified limits.
LPU in-
dicates
that the AC line voltage is above a specified limit, the
thermal switch
is closed and DCE enabled.
When the
PSU,
LPU,
DCE,
and control
common~signals
of multiple supplies are wired
in parallel,
any supply can provide the
PON and PFW
signals to
the system,
and all multiple supply outputs can be controlled by
a sing Ie DCE signal.
9-12. HP 30310A SERVICING INFORMATION
The HP 303l0A Power Supply is a nonrepairable unit
hinge-mounted
in
the cabinets as shown in figures 1-2 and 1-3.
The power sup-
ply swings out on hinges for servicing and is removable from
the
hinges for replacement.
I
WARNING
The HP 303l0A Power Supply weighs 50 pounds
(22.7 kilograms).
Two persons are required
to remove the unit from its mounting hinges.
If the power supply is found defective, it must be replaced.
Ex-
cept for replacing open fuses, no repair procedures are required.
However,
preventive maintenance procedures must be
performed on
the power
supply at scheduled
intervals to prevent
or minimize
equipment deterioration.
Preventive maintenance, adjustment, and
troubleshooting procedures for the power supply are contained
in
paragraphs 9-13 through 9-18.
WARNING
Death or serious injury may occur
if
the
following precautions are not observed.
While the input power
is
connected,
use
caution when working inside the power sup-
ply.
Many exposed conductors carry low dc
voltages which are
capable
of
supplying
heavy currents if short-circuited, result-
ing in high heat and
the
possibility
of
painful
burns.
Use caution when manipul-
ating metal tools or probes.
Wrist watch-
es, metal necklaces, bracelets,
or
rings
must
not
be worn.
Avoid dropping tools,
9-6
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Troubleshooting
