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4.12.7 Key Unit Removals
Separate the keyboard into its major units as shown in
Figure 4-56. Be careful when sliding the key unit out of
permutation unit: the Y-pull-bar may hook on the center
support screw. It is not necessary to remove any wiresif the
removal is merely for inspection. Untie the nylon retaining
wire at the end whereit is fastened to the permutation unit.
Note: Do not oil or grease the hook ends of the latch
pull-bars. Qn reassembly, check clearance of latch to
pull-bar (Figure 4-53).
4.12.7.1 Keytop
Remove keyboard cover.
Insert a straightened paper clip through slot in lower
portion of keystem below lower guide plate. (This
prevents the nylon retainer from being severed.)
. Reset the keyboard in the reading table opening.
4. Grasp the keytop by the sides with the keybutton
removal tool (part 9900373).
5. Remove keytop by pulling upward and working to the
front and rear of keyboard. Sideward motion may cause
keystem breakage.
6. To replace keytop, insert a follower rod (typewriter
service tool, part 1012444) through the keystems above
upper guide plate and rubber bumpers. (Thestraight
portion of a wire coat hanger may be used as a follower
rod.)
7. Press the new keytop onto the keystem until fully
seated. The keytop will then be at the properlevel in
relation to the adjacent keytops.
k.
2
4.12.7.2 Keystem
1. Remove the nylon retaining wire to free the desired
keystem. (Use a follower rod to aid reassembly.)
2. Lift the key from the unit while the end of the latch
pull-rod is held up and clear of latch. Be careful that the
keystem spring does not drop into the unit. Refer to
Figure 4-53,
3. Reassemble the unit. Hold the latch pull-rod free of the
latch and allow the keystem bellcrank to rotate into the
keystem. Be sure the spring is assembled on the keystem.
4. Test the position for binds.
4.12.7.3 Contact Bails
1. Remove the two bail contact assemblies shown in Figure
4-54. Each assembly is held by two screws and may be
shimmed away from the side frame. Note the position of
these shims.
CAUTION
As each bail contact assembly is removed, cover pivot
end of contact bails with cellulose acetate tape to
keep bails from falling out.
2. Punch a hole in the tape and remove the desired contact
bail.
4.12.7.4 Latch Assembly
1. Separate the key and the premutation units.
2. Remove wires from all keystem contacts and the two
restoring magnets (Figure 4-56).
Figure 4-56. Keyboard Key Unit and Permutation Unit
4-40
(4/69)
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