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LBr37072
MAINTENANCE
PREVENTIVB
I{A
INTENANCE
To insure- bigh operating efficiency and to prevent mechanical and electrical
fail"ures
from interrrlpting
system
operations, routine checks should be
made
of all mechanical
and
electrlcal
parts at regular intervals,
This preventive maintenance should include
the
checks
as listed in the table of
Maintenance Checks.
DI
SA SS
EI4BLY
To
service
the
transmi tler/
receiver (Tx-Rx) board, loosen
the
tvzo screws securing the bottom
cover at the rear of the radio.
Then sl ide the cover out
from
under tbe edge of
the front
control panel and lift
off.
To service the
IOC
board,
loosen
the two
screws
at the rear of
the
radio
and sl
ide the cover out
from
the edge of the front
control
panel and lift
off
.
To
remove
the
Tx-Rx board:
Remove the
top and
bottom
covers.
Remove
the four
screws securing
the front
panel to the
,,H,r
frame
a
nd remove the front
panel.
MAINTENANCE
CHECKS
lNTERVAL
o
Mon
t
hs
AS
Requi
red
CONNECTIONS
-
Ground
connections and connections to the voltage
source
should be periodically checked for tightness.
Loose
or poor
connec-
tions to the
power source
will
cause
excessive voltage drops and faulty
operation.
When
ground connections
are not
made
directly to the bat-
tery, the connection from the battery to vehicle chassis
must
be
checked
for low impedance. A high
impedance may
cause excessive
volt-
age drops and
alternator noise
problems.
x
ELECTPTCAL
sYsrEM
- check the voltage regulator
and
alternator or
gen-
erator periodically to
keep
the electrical
system
within safe
and
economical
operating limits.
over-voltage is indicated
when
the bat-
tery loses water rapidly.
usage
of 1 or 2
ounces
of water per ce1l
per
week
is acceptable for batteries in continuous operation.
A weak
bal-
tery will often
cause
excessive noise or faulty operation.
X
I4ECHANICAL
INSPECTION
- Since
mobile
shock
a
nd
vi
bra
t
i
on
, check for
1
oose
to
mal<e
sure that nothing is
working
units are subject to
constant
p1ugs, nuts, screws and parts
I
oose
.
x
ANTENNA
-
The
antenna, antenna
base
and
clean and free from dirt or corrosion.
should
become
coated or poorly
grounded,
signal will result.
all contacts should be
kept
If the
antennas
or its
base
loss of radiation
and
a
weak
X
ALIGNMENT
-
The
transmitter and receiver meter readings should
be
checked
periodically,
and
the alignment "touched up"
when
necessary.
Refer to the applicable
ALIGNI{ENT
PROCEDURE
and troubleshooting
sheet
for
typica
I voltage
readings.
x
FREQUENCY
CHECK
quired hy
FCC.
-
Check
transmitter frequency
and
deviation as re-
Normally, these
ehecks
are
made
when
the unit is first
put into operation, after the first
six
months and once
a year there-
after.
x
Be careful
when removi.ng the
top cover as the
speaker
leads are connected to
the
boa
rd
.
10
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