Power Supply Removal And Replacement; Removal - IBM 5251 Series Maintenance Information Manual

181
POWER SUPPLY REMOVAL AND
REPLACEMENT
Removal
CAUTION
Place the display station away from the edge of the
table to prevent it from falling, and do not tip the
machine on its back or side when removing the power
supply.
1 . Power off.
2. Disconnect the line cord from the wall outlet.
3. Open the front and rear covers.
4. Disconnect the cables to the display assembly, the
Power switch, and the main planar board.
5. Disconnect the low voltage connector from the
power supply PC board (180).
6. Disconnect the display AC power cable (150).
7. Remove the ground wire that connects the rear of
the power supply to the base.
8. Disconnect the top two wires from the Power
switch (remember the position of the wires for
reassem bly).
9. Remove the Power switch bracket (two screws)
and the rear cover strain relief cable from the
power supply.
10. Using a socket tool, remove the six mounting
screws from the power supply.
11. Lift the power supply from the display station
housing.
12. Place the used power supply in the shipping
container, so it can be returned to the branch
office.
180-181
Replacement
1. Set the new power supply in the display station.
2.
3.
4.
Fasten the mounting screws on the power supply.
Reconnect the cables.
Align the Power switch with the hole in the front
bezel.
5. Check the World Trade transformer connections
(184).
Maintenance Procedures 5251 MIM 1-99