4-54
Assembly
Access
Power Supply Assembly
WARNING
ENSURE
THAT POWER SWITCH
IS
OFF
AND THAT COMPUTER
POWER CORD
IS
UNPLUGGED
FROM
AC
OUTLET
BEFORE
RE-
MOVING POWER SUPPLY.
1.
UNPLUG COMPUTER POWER CORD FROM AC OUTLET.
2.
Remove
front
and
rear covers from
computer
as previously described.
WARNING
WHEN POWER SUPPLY
IS
REMOVED
FROM
COMPUTER YOU
ARE
EXPOSED TO LETHAL VOLTAGE
FROM
POWER
SUPPLY
CAPACITORS.
DISCHARGE POWER SUPPLY CAPACITORS
ACCORDING TO THE FOLLOWING
STEPS.
FAILURE TO FOL-
LOW
THESE PROCEDURES COULD RESULT IN INJURY
OR
DEATH.
3. Familiarize yourself with the
power
supply discharge tooL
HP
PN
09855-67004,
if
you
have
not
previously
used
it.
The
discharge tool consists of a
meter
and
a switch-operated dischar-
ger.
The
meter
indicates the approximate voltage across the energy storage capacitors
in
the
power
supply.
WARNING
WHEN PERFORMING THE NEXT
STEP.
ENSURE
THAT NO MET-
AL
OBJECTS
ARE
IN YOUR HAND
OR
ON
THE
POWER
SUPPLY.
THE DISCHARGE
TOOL
PINS
WILL
HAVE
HIGH
VOLTAGE
ACROSS
THEM.
4. Carefully insert discharge tool pins directly into SAFETY DISCHARGE holes
on
top
of
power
supply until tool rests
on
power
supply
lid
(Figure 4-57). Little force
is
required
if
tool
is
straight
when
inserted.
The
meter
gives
an
approximate indication of voltage across
capacitors.
WARNING
ALTHOUGH THE DISCHARGE TOOL SWITCH CAN
BE
MOVED
IN EITHER DIRECTION, THE TOOL DISCHARGES THE SUPPLY
ONLY
WHEN THE SWITCH
IS
PUSHED DOWN.
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