Control Data Corporation CYBER 180 810 Maintenance And Parts Manual page 119

REPLACEMENT
1. Replace battery pack by reversing removal procedure steps 2 through 8.
2. Apply power to computer cabinet following Computer Cabinet Power Up
procedure.
SWITCHING POWER SUPPLY
Refer to figures
4-5,
and
4-6,
find numbers
19, 20,
and
21
to identify power
supply.
TOOL REQUIRED
Set of wrenches, voltmeter.
REMOVAL
1. Remove power from computer cabinet following Computer Cabinet Power
Down procedure.
WARNING
If backup battery option is installed,
make sure three cable connectors to the
battery packs are disconnected.
2. Disconnect 15 position plug from the power supply.
3. Measure the input V de to the power supply at terminals marked
+
and -. Make sure voltage level equals zero or below
20
V de.
4. Disconnect two wires from the terminals and label them for replacement.
5. Remove four bolts connecting power supply and power bus.
6. Open the back doors of the computer cabinet.
7. Detach the back cover of the power module by removing three holding
screws.
8. Remove two frame holding screws from the faulty power supply securing
plate.
9. Go to the front of the power module and push the power supply out far
enough so that you can remove it from the back.
10. Remove power supply from the back of the power module.
60469500 A 6-25