2.
Lift
the
circuit board from
the
all-keys assem-
bly, and place
the
circuit board on its base
in
a
clean area.
3. Handle
the
all-keys assembly by
the
sides.
Be
careful
not
to
press any keys. Lift
the
all-keys
assembly
off
the
base,
turn
it
over,
and
place it
on
the
base_
Note:
Swap
the key module
if
the flyplate comes
off.
Do
not
attempt
to repair the mOdule.
Re-
paired modules
can
cause
intermittent
failures.
4. Press down on
the
key module until it
is
free
of
the
holding plate.
5.
Lift
the
edge
of
the
all-keys assembly nearest
the
key module
that
has just been removed.
Remove
the
bad module.
6. Lift
the
all-keys assembly by
the
edges, and
invert it on its base.
6.7.6.2 Key Module Replacement
1. Ensure
that
the
alignment
tab
and
the
angled key-
stem are
in
the
same position
as
those
of
the
other
modules
in
the
all-keys assembly.
2.
Install
the
new module
(PN
1748131) by press-
ing
the
key module into
the
holding plate by
hand.
3.
Clean
the
printed circuit board by carefully
wiping it with a lint-free
cloth
moistened with
isopropyl alcohol. Inspect
all key module fly-
plates for any foreign matter, and carefully
clean if needed.
4. Align
the
holding screw holes through
the
base-
plate, circuit board, insulator, and
top
insulator
(if used). Lower
the
circuit board assembly
on
the
all-keys assembly. Secure
the
circuit
board
to
the
all-keys assembly with
the
holding
screws.
5. Reinstall
the
keyboard assembly on
the
base,
maintaining its original alignment.
6.
Reinstall
the
key
button
in
the
correct location.
SY27-2510-6
(1/81)
6-13
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