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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. IF THE POWER SUP-
PLY DISCHARGE TOOL IS NOT AVAILABLE, WAIT AT LEAST 15
MINUTES AFTER REMOVING POWER FROM COMPUTER AND
CONTINUE WITH STEP 8.
Assembly Access
4-7
4. 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.
5. Carefully insert discharge tool pins directly into SAFETY DISCHARGE holes on top of
power supply until tool rests on power supply lid. 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.
CAUTION
DO NOT USE DISCHARGE TOOL FOR MORE THAN TWO DIS-
CHARGES IMMEDIATELY FOLLOWING ONE ANOTHER.
6. Push discharge tool switch down and hold down to discharge capacitors. Discharging takes a
few seconds. Observe meter movement as switch is held down until capacitors are complete-
ly discharged.
7. Carefully remove discharge tool by pulling straight out of power supply.
8. Disconnect power supply cable from power supply.
9. Disconnect safety ground cable from lug on chassis.
10. Loosen four #2 Pozidriv captive screws that attach power supply to chassis.
11. Pull power supply straight out of chassis.
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