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mounted on the transom should
be washed
periodically
with
mild
soapy
water to remove
any
ac-
cumulated road
grime
or
oily
film.
This is essential to have
good
contact between the transducer
and the water.
Periodically,
the rubber roller on
the
paper
drive
should
be cleaned
with a cloth
dampened
with al-
cohol,
to
improve
the friction on
the drive shaft.
(See page 16,
Figure 29).
DO SECTION
Do
carry
a
spare
fuse,
sty/us
belt,
and roll of
paper.
Do use the
tape
from a new roll
or
paper
to attach it to the
take-up
spool.
Do use the
empty
cardboard
core from the last roll of
paper
on
the
take-up post.
Do
carry
a
pencil
to make
notes
on the
paper.
Do
keep
the recorded
graphs
for future reference.
Do clean the
stylus
belt and
wheels with alcohol after
every
five rolls of
paper.
DON'T SECTION
DON'T OPEN
THE.CASE
WHEN THE UNIT IS ON.
Don't
pull
the
platen assembly
down when the
stylus
is at the
front.
Don't store
any objects
inside
the case or behind the
viewing
door.
Don't
forget
to
tape
the
paper
to
the
take-up
core.
Don't rotate the
stylus
belt
up.
Don't use
oily
cloths,
strong
sol-
vents or abrasive
cleansers.
TROUBLESHOOTING
Symptom
On/Off
switch is
ON",
but the
stylus
and
paper
don't move.
What To Do
Check
fuse;
check
connections
16
at
battery; tighten power
cord
connector,
Symptom
On/Off
switch is
'ON",
have
zero
mark,
but no echoes or bot-
tom
signals.
What To Do
Be sure the transducer is
plugged
into the unit and the
transducer is in contact with the
water.
Symptom
The unit is
ON,
but
paper
does
not move.
What To Do
Tape Paper
to cardboard
spool
on
take-up post.
Symptom
Recorder marks are faint or dim.
What To Do
Clean
viewing door; replace
the
stylus;
check
battery
connections.
Sympton
Recorded marks are
very
heavy; paper
is torn
by stylus.
What To Do
Bend the
stylus slightly
to re-
duce
pressure
on
paper.
VI ADVANCED OPERATION
Surface
Clarity
Control
(SCC)
The surface
markings
at the
top
of the chart
paper
can,
at
times,
extend
many
feet below the sur-
face. This often interferes with the
area that one is
trying
to
graph.
Surface clutter is caused
by algae
and
plankton,
air bubbles created
by
wave action or boat
wakes,
bait
fish,
or
temperature
inversions.
The
surface
clutter can be re-
duced or eliminated
by
using
the
MARK/SCC
key
on the control
panel.
To use the
SCC, control,
press
1
for minimum
effect,
2
for an inter-
mediate
control,
or 3 for maximum
elimination of surface
clutter,
and
then
press
MARK/SCC.
A
reduc-
tion of the surface clutter
will im-
When
high Sensitivity settings
are
used,
a second bottom echo
will
appear.
This is normal and is
caused
by
the
returning signal
re-
flecting
off the surface of
the wa-
ter,
making
a second
trip
to the
bottom and back.
When detailed information
about
brush
piles,
individual fish
or the
thermocline is
desired,
the Sen-
sitivity
knob
should be set at about
¾
point.
Refer to the illustration
below to see what effect the Sen-
sitivity setting
has on the recorded
information.
Recording
individual fish with an
"arched"
signature
can
usually
be
accomplished
at
trolling speed
with the
Sensitivity
knob at the 3/4
point,
or
higher.
Refer to the sec-
tion "Arched
Signatures,"
on
page
10 for more information about this
important
function of
your
recorder.
Suppression
Control
The
Suppression
Control is
used to reduce interference
from
noise.
Noise,
in electronic
terms,
is
any
undesired
signal.
It can be
caused
by
an electrical
source,
(such
as the
engine's
ignition sys-
tem),
or
by
air bubbles in dis-
turbed water which is called cavi-
tation noise. In both
cases,
the
noise could
produce
unwanted
marks on the
paper. (See Figure
44
&
45.) Fortunately,
noise
pulses
are
relatively
short in time com-
pared
to real sonar
signals.
Ad-
vancing
the
Suppression
knob will
cause the
system
to
reject
these
unwanted,
short
pulses
without
reducing
the
sensitivity
in
any way.
This
patented design
is exclu-
Figure
6
12
I
,
Figure
7 SENSITIVITY: TOO Low
Figure
8
SENSITIVITY:
PROPER SETTiNG
5
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