Specifications

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.
After
every
five rolls of
paper,
the
stylus
belt and the wheels
it rides
on should be
wiped
clean with a
soft, rag
moistened with alcohol
to
remove
carbon dust.
Strong
sol-
vents or abrasive cleaners should
not
be used.
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.
Periodically,
the rubber roller on
the
paper
drive
should be
cleaned with a cloth
dampened
with
alcohol,
to
improve
the fric-
tion on
the drive shaft.
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
case or behind the
viewing
win-
dow.
(Except
for small
pieces
of
tape.)
Don't
forget
to
tape
the
paper
to
Q p.r
r
I
per speed may
also be slowed
when not
looking
for fish or
to
simply
conserve
paper.
GRAYLINE CONTROL
The GRAYLINE
function can be
used to outline the bottom
con-
tour which
might
otherwise
be
hidden beneath trees and
brush;
it can also
give
clues to the com-
position
of the bottom. A hard
bottom returns a
very strong sig-
nal
causing
a wide
gray
line. A
soft, muddy,
or
weedy
bottom re-
turns a
weaker
signal
which is
emphasized
with a
narrow
gray
line. Do not
advance the control
too far or it will
gray
line on the
target completely, showing
no
black,
which makes the
target
dif-
ficult to see.
There are
12
ranges:
0-10 feet
0-20
0-40
0-60
0-80
0-100
0-140
0-200
0-300
0-40 0
0-600
Figure
13
0-1000
This control determines the
depth
scale
displayed
on the chart
paper.
(See Figure 13)
BOTtOM
ZOOM
By pulling
out the
knob,
the fea-
ture allows
you
to "Zoom in" on
the lower half of the
range being
displayed
on the
graph.
In other
words,
with the
Range
control set
to the 60 foot
range,
and the Bot-
tom Zoom control
pushed
in
(OFF),
the scale
printed
on the
chart
paper
will be 0 to 60 feet.
(See Figure 14.)
With the Bottom
Zoom control
pulled
out
(ON),
the scale will be 30 to 60 feet.
This allows
you
to double
the
size
of
any target
or feature in the
lower half of
any depth range.
(Figure 15.)
ZERO ADJUST
@ERANGE
IOU
-.
.
140
60
—p
—2O0
60
—....
&___300
40
---e
20
r—60O
10
—
—1000
r
GRAYLINER
'<_PAPER SPEED
4 4
0
Figure
11 GRAYLINE "OFF"
Figure
12
GRAYLINE "ON"
RANGE
14
7
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