Filter
Top Products
Figure
20
END-OF-PAPER MARKER
The
graph paper
in
the X-1SA
has a red line
printed
at the bot-
tom of the
paper
to
signify
when
there is
only
2 to 3 feet before the
end of the
paper.
ZERO ADJUST
Occasionally,
when
changing
the
stylus
or
stylus
belt,
the zero
line does not
print
at the same
place
near the
top
of the chart
paper.
A zero
adjust
control has been
placed
on the back inside wall of
the X-15A near the
upper
left
hand corner so that the zero line's
position may
be
adjusted
on
the
paper.
Open
the case front and look
for the decal
marked 'ZERO AD-
JUST". You
may
have to
pull
the
paper transport assembly
down to
see the decal for the first time.
Push the
transport
closed and turn
on the unit.
(Caution
—
Keep
hands
away
from the
stylus
belt
and
stylus. High voltage
is
present.)
Insert a 6"-8"
long
screwdriver
with a 1/s" blade into the zero ad-
just
hole and rotate the control on
the circuit board until the zero line
is at the desired
position. (Note:
This
may
also be
adjusted
with
the unit turned OFF.
Adjust
the
control,
then remove the screw-
driver and turn
power
back ON.
Repeat
until
the zero line is in
the desired
position.)
IV HOW TO READ GRAPHS
"Arched
Signatures"
A remarkable
advantage
of
the
X-15A is that it can record indi-
vidual fish with a characteristic
arched mark that
separates
them
from their
stationary surroundings.
The
reason for this is shown be-
low.
The
distance to a fish when it
moves into the sonar's cone of
sound is shown as
"A".
When the fish has moved to
the center of the
cone,
the
dis-
tance to it will be
shorter,
(line
"B"),
and as it
moves out of the
cone,
the distance will increase
again
as shown in line "C".
50
—
so
—
Figure
22
If
a
partial
arch occurs most of
the time on
your
unit,
(the
mark
curves
up,
but not back
down,
or
vice-versa)
it is
because the trans-
ducer is
not
pointed
straight
down.
If
your
transducer is
mounted on
the
transom, adjust
the
transducer
until the fish show the
distinctive
arched
signature.
This
may
take
some trial and error until the cor-
rect
mounting
is achieved.
Sharp,
well defined
signatures
will occur most often when the
Sensitivity
knob is set at the ¾
point,
or
higher.
Remember,
that
there must be some movement
between the boat and the fish to
develop
the arched mark.
Usually
this means
trolling
at
very
slow
speeds
with the main
engine
in
gear
at minimum throttle
setting.
THERMOCLINES
The
temperature
of
water
in the
lake is seldom constant from
top
to bottom.
Layers
of different tem-
peratures
form,
and the
junction
of
a warm and cool
layer
of water is
called a thermocline. The
depth
and thickness of the thermocline
can
vary
with the season or time
of
day.
In
deep
lakes there
may
be two or
more,
at different
depths.
Thermoclines are
import-
ant to the fisherman because
they
are areas where fish are active.
Many
times bait fish will be above
the thermocline while
larger game
fish
suspend just
below it.
Your Lowrance X-15A can de-
tect this invisible
layer
in the
water,
but the
Sensitivity
knob will
probably
have to be set at the 1/2
point,
or
higher.
PAPER LOADING
CAUTION
—
High voltage
is
pre-
sent in the electronic section
when the unit is turned on.
-
1. TURN THE UNIT OFF.
2. Release both catches on the
top
of the case. Pull out and
down on the
top
of the case
front to
expose
the
platen
as-
sembly. (See Figure 23.)
3. Move the
stylus
belt
DOWN,
to
position
the
marking stylus
on
the back side of the
pla-
ten. NEVER move the belt
up
—
the
stylus may
be
damaged. (See Figure 24.)
SPECIAL NOTE: The
stylus
may
be
damaged
if the
platen
assembly
is
pulled
down un-
less the
stylus
has been
moved to
the back side of the
platen.
0—
10
—
20
—
30
—
40—
-4
-v-,
Figure
21
10 11
PDF compression, OCR, web-optimization with CVISION's PdfCompressor