Key Module; Removal; Installation - IBM 5251 Series Maintenance Information Manual

133
KEY MODULE
Removal
1. Use the key top removal tool (part 9900373) to lift
the key tops from the keys to be removed.
CAUTION
To prevent loosening a flyplate, ensure that no keys are
pressed.
2. Disassemble the keyboard (131).
3. Reach under the key unit and push up the failing
key module until it is free.
Note: The module retaining ears must clear the frame
. . as shown.
Notch
~
131-133
•••••
.
..
Installation
1.
2.
3.
Insert the key module. Align the opening in the
key module with the location lug in the mounting
hole. The key stem must be positioned, so the
notch is facing the Spacebar edge of the
keyboard.
Reinstall the pad printed circuit board.
Turn the key unit over and, if necessary, place the
dust shield in the correct position.
4. Put the key top on the key unit.
5. Reinstall the logic printed circuit board and cover.
Maintenance Procedures 5251 MIM 1-49