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5.3.5.7
Type A Spacebar Assemblies
Type A spacebar assemblies consist of the spacebar group
(PN 5995544) and the spacebar switch module (identical to
other switch modules). The spacebar group comprises the
spacebar, the torsion bar, and the two spacebar guide
modules. Replacement of any spacebar part requires
removal of the spacebar and torsion bar. Perform the
removals in paragraphs 5.3.5.1 through 5.3.5.3 for access to
the keyboard assembly.
A.
Spacebar Removal:
1. Grasp torsion bar near one end with thumb and
forefinger (Diagram 5-7) and flex it upward, snapping
it forward out of retaining lugs on spacebar guide
module.
2. Swing loose end of torsion bar upward, and disengage
it from other spacebar guide module.
3.
Lift
spacebar straight up out of spacebar guide
modules. This exposes spacebar guide modules and
spacebar switch module.
Diagram 5-7. Torsion Bar Removal
(Type
A)
4. If spacebar group is to
be
replaced, remove spacebar
guide modules as explained in paragraph 5.3.5.6A,
step 2. (See Diagram 5-8).
Lift
module straight out
with thumb and forefinger.
8ernoval
Toot
Diagram 5-8. Spacebar Guide Module Removal
(Type
A)
5. If spacebar switch module is
to
be replaced, remove
switch module as described in paragraph 5.3.5.6A,
steps 2 through 4.
B.
Spacebar Replacement:
1. If spacebar switch module is to
be
replaced, use
procedure described in paragraph 5.3.5.68, steps 1
through 3.
2. If spacebar group is to
be
replaced, insert new
spacebar guide modules into mounting frame;
be
careful to have torsion bar retaining lugs positioned
to the front. Be sure that D brackets lock gu ide
modules firmly in place.
3. Insert spacebar guides in spacebar guide modules, and
drop spacebar in place.
4. Holding torsion bar at a suitable angle and position,
insert end of torsion bar in the hole in one spacebar
guide (Diagram 5-8). At the same time, engage torsion
bar with retaining lugs on guide module. Lower
torsion bar to horizontal. Flex it as during removal,
and insert other end simultaneously into hole in other
spacebar guide and into retaining lugs on other guide
module.
5. Operate spacebar to see that switch module operates
freely and that torsion bar and spacebar guides do not
bind.
6. Replace keyboard top cover and reconnect keyboard
to display station.
5.3.5.8 Keybutton Support Modules - Type A Keyboards
Only
The longer keybuttons, 1-3/4 and 2-3/4 units long, ·on Type
A keyboard utilize support modules PN 5995543 and PN
5995547, respectively.
A. Support Module Removal:
1. Remove keybutton(s) to provide adequate work
space.
2. Take the two small, flat, pointed tools from box
containing new module, and slip one down inside face
of each D bracket (retainer)
to
force brackets away
from locking channels on plastic case of old module.
3. With flat tools in this position, grip shouldered
portion of support module plunger with pliers, and
pull old module straight out.
B.Support Module Replacement:
1. Check that return spring is firmly seated on spring
boss on bottom of plunger of nfi!W support module. If
it is not, invert module, place spring on boss, and
compress and rotate spring until last coil expands
around boss.
2. Insert new module into keyboard switch mounting
frame, with orientation arrow on top of module
housing pointed in same direction as arrows on other
modules. As module is inserted,
be
sure plunger
Checks, Adjustments, and Removals
5-17
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