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(2) Replacing the
LCD
Assembly
(SYSTEMS SABER
III
Only):
(a)
With the display facing downward, locate and
care-
fully straighten the
six bent-over
metal
tabs holding
the
LCD
assembly
to the
the controller board, then
separate the
LCD
assembly
from the board.
(b) Inspect the two rows of
LCD
contacts
on the
con-
troller board for
damage
and/or foreign material,
and clean
if
necessary.
(c) Using finger cots, inspect
the new
LCD
assembly
for
fingerprints or other foreign material.
Clean,
if
necessary, only
with
water-activated optical wipes.
(d) After first making sure that the lens shipping pro-
tection has been removed, insert the new
LCD
assembly so
that the viewing side of the
display
shows
through the window
in
the bezel, and the
seal
on
the
display
fits into the corresponding
recess
in
the bezel.
(e) Insert the
LCD
lightpipe
into
the
bezel
with the
clear side facing
the
back
of the display.
(f) Position the
elastomers along the top
and bottom
edges
of the
LCD
lightpipe
so that the
conductive.
black dots
on
the elastomers connect the
LCD
to
the
contacts
on
the controller board.
(g) Place the
controller board over the metal
tabs
on
the
LCD
bezel and, while applying
firm,
even pres-
-
sure-to-fully-seat
the
LCD-assembly into the-con-
troller board, bend all the
tabs
inward.
e.
Backshield.
Assembly
¢
Before removing the backshield, ensure that
all
static electricity safeguards are
in
place.
¢
For best results,
loosen/tighten all four
screws
light-
ly
before loosening/tightening any single screw
completely.
«
The backshield screws are
held
captive
in
the
shield after being loosened.
f.
Circuit Boards
and Modules
¢
All modules plug
into
sockets
on the main circuit
.
board.
Some
modules are fastened
to the main board
and
frame with
screws; remove these screws
before
attempting
to
unplug
a
module.
Never
substitute
any screw.
Several
of the
modules are designed
to be
removed with
a
standard DIP extractor
tool
(OK-1
or
equivalent).
Always use
the extractor tool when
removing these modules
to
avoid damaging their
leads.
Some
modules have guide pins
to
assist
in
inser-
tion or removal.
Pressure may be applied
to
these
guide pins
to aid removal of
a
module
if,
and only
if,
it
is distributed
evenly over
all
guide pins
on
the
module.
Applying all
the force to
a single guide
pin
will
cause severe damage
to
the module.
The secure
module
(U900) is
not
serviceable.
Before reinserting any module,
always check
its
leads
for
damage. Gently straighten any leads
that
may be bent; replace any modules with
severely
damaged leads.
Before reinserting reference oscillator module
U301 into the main circuit board, be
certain that its
squared
(pin 1)
corner is correctly oriented per the.
main circuit board component layout
diagram.
When electrically testing
and/or probing the main
circuit board with the
back shield removed, always
use the three finger screws
on
the
SYSTEMS
-
SABER-housing-eliminator service-aid-to
-
provide
--
grounding
to
VCO
synthesizer
module U300 (two
places),
and the
rf
ground clip (one
place).
When removing the
main
circuit board from the
frame assembly, do the following:
Remove
the
back shield assembly.
2.
Unplug the PTT/controls flexible circuit.
3.
Remove
the two power
amplifier module
(U202) screws
from
the frame.
4.
Remove secure
module U900.
5.
Remove
the two main compression connector
screws.
6.
Lift the board at the bottom and pull out from
under the control top panel.
1.
The
rf
and ground contacts at the top of the main
circuit
board are exposed when the board is
removed
from the frame.
Special care
must be taken
to
avoid accidental damage
to
these contacts.
7
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