Line Cordi Line Filter Removal And Replacement; Power Supply Fan Removal And Relplacement; Removal; Replacement - IBM 5251 Series Maintenance Information Manual

185
LINE CORD/LINE FILTER REMOVAL AND
REPLACEMENT
1. Remove the power supply (181).
2. Repair or replace the line cord or the line filter.
Note:
For the location of the line filter, see 180.
3.
Replace the power supply (181).
186
NOT USED
187
POWER SUPPLY FAN REMOVAL AND
REPLACEMENT
Removal
1. Open the front and rear covers.
2. If a fan guard is present, remove the nuts holding
the fan guard to the power supply frame.
3. Remove the remaining nuts holding the fan
assembly to the power supply frame.
4. Remove the two wires that connect the fan to the
power supply.
5. Lift up the heat sink assembly and the fan
assembly.
6. Remove the four screws and four nuts that hold
the fan assembly to the heat sink assembly.
Replacement
CAUTION
Do not crimp or pinch the two voltage wires between
the fan and the power supply frame.
To replace the fan assembly, reverse the preceding
steps.
188
LIGHT PEN POWER SUPPLY CARD
REMOVAL AND REPLACEMENT
Removal
1. Open the front and rear covers.
2. Disconnect the ground wire from the power supply
frame.
3.
4.
Disconnect the power input wire from the power
supply printed circuit board.
Remove the light pen power supply card mounting
screws.
5. Disconnect the cable at the light pen card.
6. Remove the card and cable assembly.
Replacement
1. Replace the light pen power supply card in the
reverse order of the removal.
Maintenance Procedures 5251 MIM 1-103