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wheels
by reversing
the
proce-
dure used to remove the old
one. BE SURE the
fingers
of
the new
stylus
are
pointed
UP.
6. Close the front of the case.
Latch both catches at the
top
of the unit.
MAINTENANCE
NOTE:
The
stylus may
be
damaged
if it is in front of the
pla-
ten when the
platen assembly
is
pulled
down.
Always
move the
stylus
to the back side of the
pla-
ten when
changing
the
paper
rolls. Remember to move the belt
down to remove the
stylus.
Black carbon dust is created dur-
ing
the
recording process.
Use a
soft,
oil-free
rag
to clean the
viewing
door and metal
platen
be-
hind the
paper.
Low
pressure
compressed
air
may
be used to
blow dust out of the case and
away
from
moving parts
if the air
is
dry
and free of oil.
All mechanical
connections
should
be checked
periodically
to
be sure
they
haven't worked
loose.
HIGH VOLTAGE is
present
in the
transmitter section when the unit
is ON. No
attempt
should
be
made
by any
unauthorized
per-
son to
modify
or
repair
the elec-
tronic
section.
All electrical connections should
be checked
periodically
and
cleaned as
necessary.
The face of the
transducer,
if
mounted on
the transom should
be washed
periodically
with mild
soapy
water to remove
any
ac-
cumulated rod
grime
or
oily
film.
This
is essential to have
good
contact between the transducer
and the water.
DO SECTION
Do
carry
a
spare fuse, stylus belt,
and roll of
paper.
Do use the
empty
cardboard core
from the last roll of
paper
on the
take-up post.
Do
keep
the recorded
graphs
for
future reference.
-Do clean the
stylus belt, wheels,
and the rubber roller 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
F
case or behind the
viewing
win-
dow.
(Except
for small
pieces
of
tape.)
Don't
forget
to
tape
the
papeito
the
take-up
core.
Don't rotate the
stylus
belt
up.
Don't use
oily cloths, strong
sol-
vents,
or abrasive cleansers.
TROUBLESHOOTING SECTION
Symptom
On/Off switch Is
"ON",
but the
stylus
and
paper
don't move.
What To Do
Check
fuse;
check connections
at
battery
for
tightness
and
corrosion.
Symptom
On/Off switch is
"ON",
have zero
mark,
but no echoes or bottom
signal.
What To Do
Be sure the transducer is
plugged
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
water,
making
a second
trip
to the
bottom and back.
If detailed information about
brush
piles,
individual
fish,
or the
thermocline is
desired,
the Sen-
sitivity
knob should be rotatedto
approximately
the
3/4
point.
Refer
to the illustration
below to see
ft
-'
,7't
I
SENSITIVITY: TOO LOW
U
what
effect
the
Sensitivity
control
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 ¾
point,
or
higher.
Refer to the
§ec-
tion "Arched
Signatures"
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 disturbed
water which is call cavitation. In
both
cases,
the noise could
pro-
duce uhwanted marks
on the
paper.
(See
Figures
7
&
8.)
Fortunately,
noise
pulses
are rela-
tively
short in time
compared
to
real sonar
signals.
Advancing
the
Suppression
knob will cause
the
system
to
reject
these
unwanted,
short
pulses
without
reducing
the
2
Figure
4
Figure
5
SENSITIVITY: PROPER SETrING
16
5
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