Motorola SYSTEMS SABER SECURENET Handie-Talkie Service Manual - Page 15
Browse online or download pdf Service Manual for Portable Radio Motorola SYSTEMS SABER SECURENET Handie-Talkie. Motorola SYSTEMS SABER SECURENET Handie-Talkie 30 pages.
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Replacing
the
LCD Assembly
(SYSTEMS
SABER
Iil
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
unpiug 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