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Lowrance X-70A Manual

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SHOOT-THRU-HULL
INSTALLATION
The
transducer installation
inside a
fiberglass
hull
must be in an
area
that does
not have air
bubbles in the resin
or
separated fiberglass
layers.
The sonar
signal
must
pass
through
solid
fiberglass.
A success-
ful
transducer installation
can be made on hulls
with flotation
materials
(such
as
plywood,
balsa
wood,
or
foam)
between
layers
of
fiberglass
if
the material is removed
from the chosen
area. For
example,
some
manufacturers use a
layer
of
fiberglass,
then a core of balsa
wood,
finishing
with an outer
layer
of
fiberglass.
Removing
the inner
layer
of
fiberglass
and the balsa
wood core
exposes
the outer
layer
of
fiberglass.
The transducer can then be
epoxied
directly
to the outer
layer
of
fiber-
glass.
After the
epoxy cures,
the hull is
watertight
and
structurally
sound.
Remember,
the
sonar
signal
must
pass through
solid
fiberglass. Any
air
bubbles in the
fiberglass
or the
epoxy
will reduce
or eliminate the
sonar
signals.
To choose the
proper
location for thru-hull
mounting,
anchor the
boat in
60 feet of water.
Add a little water to
the
sump
of the boat.
Plug
the
transducer into the sonar
unit,
turn it
on,
then hold the
transducer over
0
FILL WITH EPOXY
a
________________________________________
aCika
EPOXY TO HULL FIR5T—
N.
OUTER HULL
the side of the boat.
Adjust
the
sensitivity
and
range
controls until a
second bottom echo is
seen on the
display. (you
will need to turn the
automatic and ASP features
oft)
Don't touch
the controls once
they've
been set.
Next,
take the
transducer out of the water
and
place
it in the
water in the
sump
of
the boat. Observe the
sonar
signal
to see if there is
a noticeable decrease in
sensitivity.
The second
bottom
signal may
disappear
and the
bottom
signal may
decrease in
intensity.
Move the
transducer around to find the
best location. If
the
sensitivity
control has
to be increased
greatly
to
compensate,
then
thetransducer should be
mounted on the outside of
the hull. If
not,
then mark
the location that
shot
through
the hull the best
and follow the
instructions on the next
pages
for a shoot-thru-hull
mounting.
INNER HULL
/
etc.,
the
sensitivity
sometimes
cannot be increased
enough
to
get
fish
arches.
One of the
best
ways
to
get
fish
arches is to
expand
or "zoom" a
segment
of the
water. For
example, using
the 2X or 4X zoom feature.
The smaller
the
segment,
the better the screen
resolution will be. The
zoom feature
expandsthe echoes,
making
it easierto see detail. Forthe best
results,
turn
the
sensitivity up
as
high
as
possible
without
getting
too
much noise on the
screen.
In medium to
deep water,
this method should
work to
display
fish
arches.
If
you
see fish
signals
when the
unit is in the manual
mode,
but don't
get
fish
symbols
when the Fish I.D.
feature is
on,
try increasing
the
sensitivity.
TROUBLESHOOTING
If
your
unit is not
working,
or if
you
need technical
help,
please
use the
following
troubleshooting
section before
contacting
the
factory
customer
service
department.
It
may
save
you
the trouble of
returning your
unit.
Unit won't turn on:
1. Check the
power
cable's connection at the unit.
Also check the
wiring.
2. Make certain the
power
cable is wired
properly.
The
red wire connects
to the
positive battery terminal,
black to
negative
or
ground.
3. Check the fuse.
4.
Measure the
battery
voltage
at the unit's
power
connector.
It should be
at least 11 volts. If it
isn't,
the
wiring
to the unit is
defective,
the
battery
terminals or
wiring
on the
terminals
are
corroded,
or the
battery
needs
charging.
Unit
freezes,
locks
up,
or
operates erratically:
1. Electrical noise from
the boat's
motor,
trolling motor,
or an
accessory
may
be
interfering
with the sonar unit.
Re-routing
the
power
and
transducer cables
away
from
other electrical
wiring
on
the boat
may
help.
Route the sonar
unit's
power
cable
directly
to the
battery
instead
of
through
a fuse block or
ignition
switch
2.
Inspect
the
transducer cable for
breaks, cuts,
or
pinched
wires.
3. Check
both the transducer and
power
connectors. Make
certain both
are
securely plugged
in to the
unit.
9
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