IBM 4851 514 Service Guide - Page 73

Control, removal, replacement, shield, button, protector

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Updated October, 2008 Removing and replacing FRUs To replace, reverse this procedure. Control card - removal and replacement 1. Remove the tablet as described in "Display tablet - removing and replacing" on page 55. 2. Remove the tablet rear as described in "Display tablet back cover" on page 55. 3. Remove the screws securing the control (button) card ( B in Figure 42). 4. Carefully lift the card from beneath the tab and lift it from the button post. 5. Disconnect the cable from the control card. Figure 42. Removing the control card 6. To replace, reverse these procedures, noting to position the card on the alignment pin and align with metal EMC shield. Control card EMC shield - removal and replacement 1. Remove the control card as described in "Control card - removal and replacement." 2. Remove the screw holding the control card EMC shield ( A in Figure 42). 3. Slide the control card EMC shield to the right and lift to remove. 4. To replace, reverse these procedures. Control card button protector - removal and replacement 1. Remove the tablet rear as described in "Display tablet back cover" on page 55. 2. Using a flat-bladed screwdriver, press inward on one end-button and lift outward to remove. 3. To replace, reverse these procedures, noting to angle the assembly such that the control buttons match the button holes. Chapter 5. Removing and replacing FRUs 57

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To
replace,
reverse
this
procedure.
Control
card
-
removal
and
replacement
1.
Remove
the
tablet
as
described
in
“Display
tablet
–
removing
and
replacing”
on
page
55.
2.
Remove
the
tablet
rear
as
described
in
“Display
tablet
back
cover”
on
page
55.
3.
Remove
the
screws
securing
the
control
(button)
card
(
±B²
in
Figure
42).
4.
Carefully
lift
the
card
from
beneath
the
tab
and
lift
it
from
the
button
post.
5.
Disconnect
the
cable
from
the
control
card.
6.
To
replace,
reverse
these
procedures,
noting
to
position
the
card
on
the
alignment
pin
and
align
with
metal
EMC
shield.
Control
card
EMC
shield
-
removal
and
replacement
1.
Remove
the
control
card
as
described
in
“Control
card
-
removal
and
replacement.”
2.
Remove
the
screw
holding
the
control
card
EMC
shield
(
±A²
in
Figure
42).
3.
Slide
the
control
card
EMC
shield
to
the
right
and
lift
to
remove.
4.
To
replace,
reverse
these
procedures.
Control
card
button
protector
-
removal
and
replacement
1.
Remove
the
tablet
rear
as
described
in
“Display
tablet
back
cover”
on
page
55.
2.
Using
a
flat-bladed
screwdriver,
press
inward
on
one
end-button
and
lift
outward
to
remove.
3.
To
replace,
reverse
these
procedures,
noting
to
angle
the
assembly
such
that
the
control
buttons
match
the
button
holes.
Figure
42.
Removing
the
control
card
Removing
and
replacing
FRUs
Updated
October,
2008
Chapter
5.
Removing
and
replacing
FRUs
57