405SXSINGLEBEAM
fishfinder
OPERATIONS MANUAL
TABLE OF CONTENTS
Section 1: Installation preparation . . . . . . . . . . . . . . . . . . . 2
Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2
Alternative Transducers and Mounting Methods. . . . . . 4
Beginning Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 2: USING THE 405SX. . . . . . . . . . . . . . . . . . . . . . . 6
How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Simulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
What You See On Screen . . . . . . . . . . . . . . . . . . . 7–11
Control Functions . . . . . . . . . . . . . . . . . . . . . . . . 11–15
Menu Functions . . . . . . . . . . . . . . . . . . . . . . . . . 15–25
Section 3: ADVANCED FEATURES. . . . . . . . . . . . . . . . . . . 24
Using Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Section 5: MAINTENANCE/WARRANTY. . . . . . . . . . . . . . . 25
Maintenance and Troubleshooting . . . . . . . . . . . . 26–28
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Rev 10416E
INSTALLATION PREPARATION
PARTS SUPPLIED
PARTS SUPPLIED
Before installing your 405SX, please ensure the following parts are included in
the box:
• 405SX fishfinder
• Transducer with 20' of cable and mounting hardware kit
• Mounting system and mounting hardware kit
• 6' power cable
• Publications kit
+
Note: The 405SX includes a temperature sensor and the 405SX
includes speed and temperature sensors with appropriate
hardware and instructions for installation.
If any of these items is missing contact your local dealer.
ACCESSORIES
Humminbird offers a wide assortment of accessories that complement and
expand the capability of your new 405SX. These accessories are designed with
the same high standards. The Humminbird Accessory catalog included with
your unit contains descriptions of the many accessories available and ordering
information. All Humminbird accessories are available through your full-service
Humminbird dealer.
INSTALLATION OVERVIEW
The 405SX consists of two primary components to install: the control head and
the transducer.
The control head contains the sonar transmit and receive circuitry, as well as the
user controls and display. It should be installed in a location that provides access
to the controls and visibility while in use. The control head mounts on a quick
disconnect mounting system that swivels and tilts, providing flexibility for
viewing from almost anywhere on the boat.
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INSTALLATION PREPARATION
INSTALLATION OVERVIEW
The transducer converts electrical energy from the transmitter into mechanical
pulses or sound waves. The transducer also receives the reflected sound waves
and converts them back into electrical signals for display on the control head. It
should be installed in contact with the surface of the water in an area that has
smooth water flow - usually on the transom of the boat. There are several
mounting options for the transducer. Review the
following section to determine the method that
works for you and your boat.
Determining How to Mount the
Transducer
The 405SX includes a model XT-6-24 transducer.
This transducer can be mounted on the transom
of the boat, or bonded to the inside of a
fiberglass hull boat.
The transom installation, which is the most
widely used, places the transducer on the outside
of the boat hull. This technique produces the
Transom Mounted Transducer
least signal loss, and provides a way to adjust the
transducer after installation. The mounting
hardware included is designed to
protect both the boat and the
transducer should the boat strike
debris in the water or when trailering.
As an alternative to transom mounting,
it is possible on many fiberglass-hulled
boats to glue the transducer on the
inside of the boat hull. Since fiberglass
has similar sonar characteristics as
water, the sonar signal can pass
through the boat hull with minimal
loss. The hull of the boat must be single
layer construction (not double-hulled).
Inside the Hull Mounted Transducer
Also, any air trapped in the lamination
of the fiberglass would prevent the
sonar signal from passing through.
For additional details reference the
TRANSDUCER INSTALLATION section of
the enclosed Installation Sheet.
3
INSTALLATION PREPARATION
ALTERNATE TRANSDUCERS AND MOUNTING METHODS
Inside the hull installations require no holes to be drilled into the boat and
through experimentation, high-speed operation comparable to transom
mounting can be achieved. Two part, slow cure epoxy is required to glue the
transducer in place.
ALTERNATE TRANSDUCERS AND MOUNTING METHODS
The 405SX comes with everything necessary for installation and operation on
most boats. However, there are several situations which may require a different
type of transducer. Inboard boats, wood or metal hulls, and sail boats create
unique transducer mounting needs. Alternate transducers and mounting
methods are detailed below.
Portable Mounting
The standard transducer can be adapted for
portable installations using part number MHX-PT2.
This accessory adapts your transducer to a suction
cup mount for temporary installation on the boat
hull or other surface.
Trolling Motor Mounting
The standard transducer can also be adapted to
mount on most trolling motors using part number
AD-STM-7. This accessory includes a bracket and
hose clamp that allows mounting the transducer to
the body of most trolling motors.
TRANSDUCER EXCHANGE
Other transducers are available as replacements for
the standard transducer. You may exchange your
new and unassembled transducer for another type
by returning it to the address listed in Customer
Support. Some transducers may have additional costs. Refer to the Accessory
catalog or call Customer Support for information.
4
INSTALLATION PREPARATION
BEGINNING INSTALLATION
BEGINNING INSTALLATION
Now that you have determined the transducer mounting method, you can
begin installation of the 405SX. The fold out installation guide included
provides detailed step by step instructions for installation of the control head
and transducer. For transom mount transducer installations, you will need the
mounting template at the back of this manual.
In addition to the parts included you need the following for installation and
operation:
• A powered hand drill and various drill bits
• Phillips and flat-head screw drivers
• A ruler or measuring tape
• Pen or pencil
• 12 volt power source (your boat’s battery)
• A 1-amp fuse
• A fuse holder (if you are wiring directly to the boat’s battery)
• Silicone sealant (for sealing drilled holes)
• 2-part, slow-cure epoxy (for inside the hull transducer installations)
+
Note: If you have purchased the 405SX you will have in addition
to the parts and instructions above:
• Speed and Temperature sensors
• Instructions for installing speed and temperature sensors
• Appropriate hardware to mount sensors
5
USING THE 405SX
HOW SONAR WORKS
HOW SONAR WORKS
Your Humminbird unit uses sonar to
locate and define underwater objects,
define the bottom terrain, as well as
determine distance.
Sonar technology is based on sound
waves. Your Humminbird unit sends out
a sound wave signal. With this signal it
determines distance by measuring the
time between the transmission of the
sound wave and when the sound wave
is reflected off an object. Your
Humminbird uses the reflected signal to
interpret location, size and composition
of an object.
Sonar is very fast. A sound wave can travel from the surface to a depth of 600'
and back again in less than ¹⁄₄ of a second. It is unlikely that your boat can
"outrun" this sonar signal.
The 405SX is a 200 kHz, single-beam fishfinder. The 200 kHz frequency
provides excellent sonar resolution (the ability to distinguish small returns or
returns which are close to the bottom), while providing depth capabilities to
600’. The shape of the sonar beam is symmetrical and covers an area of
approximately 24 degrees side to side and front to rear.
Actual depth capability depends on factors such as bottom hardness, water
conditions, and transducer installation. Units will typically read to deeper
depths in fresh water than in salt water.
SIMULATOR OPERATION
The 405SX contains a simulator that allows you to use the unit as if you are on the
water. The simulator is invaluable for learning how to operate the 405SX.
There are two ways to start the simulator. If the unit is powered off, press and hold
the POWER button for approximately three seconds until you hear a continuous chirp.
The simulator can also be started by selecting the Simulator option on the start-
up screen after you power-up the unit. When this screen is shown, simply press
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USING THE 405SX
SIMULATOR OPERATION
the DOWN ARROW until “Simulator” is
highlighted. When the screen times out, the
unit will be in simulator mode.
When in simulator operation, the 405SX
responds to control inputs as if it is in actual
operation, so feel free to experiment, or to
customize the unit for your particular
operation.
To exit Simulator mode, power the unit off.
FEATURE MEMORY
If your 405SX is installed with a transducer connected, any changes you make
to the set-up or User Options (see Control Functions) while in Simulator are
retained in the unit’s memory. This allows you to use simulator to experiment
with the various set-up options, and retain your selected settings for normal
operation.
If you are using the 405SX in Simulator when no transducer is connected, any
selected options are lost when the unit is powered off. The 405SX will return
to Factory Settings, or options selected when last used with a transducer, if no
transducer is connected.
IMPORTANT: A transducer must be connected to the 405SX in
order to retain user settings selected when in simulator mode. If
no transducer is detected, the unit defaults to pre-selected
options when powered off.
What You See On-Screen
Your 405SX uses a 160 x 160 matrix FSTN LCD display. This display provides
outstanding viewability in all light conditions over a wide range of
temperatures.
At initial power-up, the 405SX uses settings that were set at the factory. After
initial use, the 405SX will remember the settings you enter.
There are several elements on-screen that are common to all modes of operation.
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USING THE 405SX
WHAT YOU SEE ON-SCREEN
Temperature/Speed. The initial screen layout takes one of two basic forms
depending on whether the optional Temp/Speed accessory is installed. Figure
A shows the default view when the Temp/Speed accessory is installed. Figure B
shows the default view when the Temp/Speed accessory is not installed.
Depth. The digital depth
Figure A
number shows the water depth
directly beneath the transducer
location.
Depth Range. The depth range
is shown to the right of the screen.
The upper number is 0 indicating
the surface of the water. The lower
number is one of the nine depth
ranges available that best match the
depth of the water. As the depth of
the water changes, the range
changes as necessary in order to
retain a bottom representation on-
Figure B
screen. When in Auto mode,
the horizontal line at the top
of the screen is the “zero
line,” representing the surface
of the water. Occasionally
there is a gap in this line. This
gap indicates the unit is up-
dating the display even if the
bottom is not visible on-
screen, or if the bottom
information is not changing.
Bottom Depiction
Zero Line
New sonar information appears
on the right side of the graphic
area of the display and moves
to the left as new information
is displayed. The 405SX
Water Depth
Depth Range
automatically
selects
the
appropriate depth range to show the depth of water beneath the transducer.
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USING THE 405SX
WHAT YOU SEE ON-SCREEN
This range is selected so the bottom representation is typically shown about ²⁄₃
down the display.
Bottom. The graphic depiction of the bottom provides the user with an
effective tool for understanding the composition of the bottom. The FSTN type
display uses 4 discrete levels of gray to indicate the intensity of the returned
sonar signal. The 405SX can display even the smallest sonar returns with light
gray pixels. Larger returns are displayed with darker shades of gray. If the
bottom is hard and smooth, the bottom depiction is narrow and dense. If the
bottom is soft mud or sand, the depiction will be thick and less dense. This
indicates that much of the signal is absorbed by the soft bottom. If the bottom
is rocky or rugged in composition, the depiction is of varying density and
textured in appearance.
Wave action also affects the bottom depiction. The information drawn is a
distance measurement, so if the boat is moving up and down over flat bottom,
the bottom depiction often appears in regular variations that match wave
timing.
Structure. Structure is defined as any object physically attached to the bottom.
The sonar configuration of the 405SX is optimized to give the most accurate
depiction of bottom structure possible. Grass, trees, stumps, wrecks or other
debris are accurately displayed, however the depiction of these objects varies
with boat speed and direction. The
best way to learn to interpret
Surface Clutter
Rocky Bottom
structure is to operate the 405SX
over a variety of known conditions
and experiment with user functions
to best represent those conditions
on-screen.
Surface Clutter. Surface clutter is
the layer of water near the surface
that is rich in algae and other
growth, and often is aerated by
wind or wave action. This area of
water interferes with sonar
transmission and often appears on-
screen as regular clusters of ind-
ividual dots near the “0” line.
Hard Bottom Soft Bottom
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USING THE 405SX
WHAT YOU SEE ON SCREEN
Thermoclines. Thermoclines are
sharp differences in water
temperature. These are easily
identified by the continuous
nature of the return.
Thermocline Second Return
Second Returns. When a sonar
signal is reflected off the bottom
back to the transducer, there is
often enough energy left in the
signal to be reflected off the
surface of the water back to the
bottom a second time. Second
returns appear as a slightly
weaker bottom representation
exactly twice the depth of the primary bottom return. The second return is most
likely to occur in shallow water and in areas of relatively hard bottom.
Fish Arches. With Fish ID off, schools of bait
fish as well as individual fish are clearly visible
on the 405SX display. Bait fish appear as
"clouds" having different shapes and sizes
depending on the number of fish and boat
speed. Individual fish appear as smaller black
Fish Arch Diagram
and gray lines often appearing as a "fish arch."
A fish arch forms as the boat move over the fish. Due to the transducer
beam angle the distance to the fish decreases as it moves into the beam,
and then increases as it moves out. When the window graphs this distance
change, an arch appears. The true depth of the fish is the top of the arch
when the boat is directly over the fish. Boat speed and movement of the
fish greatly affect the shape of the arch. When moving slowly, a fish creates
an elongated arch. With the boat moving fast the arch appears shorter. A
partial arch forms when the fish does not move through the entire cone angle.
The 405SX displays structure such as submerged grass, brush, trees and
wrecks on the bottom. Structure can be distinguished by comparing the
area just above and below the main bottom return. Usually structure shows
as areas of dark to light gray on top of a dark bottom contour. The
appearance of structure is greatly affected by boat speed and direction; to
10
USING THE 405SX
WHAT YOU SEE ON SCREEN
repeat the same image it is often necessary to travel the same speed and
direction over the location where the structure was originally located.
The 405SX is also capable of showing layers of water having different
temperatures. These temperature differences, called thermoclines, appear at
different depths, depending on current conditions. A thermocline typically
appears as a continuous band of light gray moving across the display at the
same depth. Thermoclines always appear above the bottom.
It is important to remember that sonar cannot distinguish between a fish
and some other object suspended in the water. Regardless of the object the
sonar detects, each will be drawn as an arch.
Fish ID. The 405SX uses
advanced signal processing
to further evaluate any
sonar return between the
surface and the bottom. For
instance, a small school of
bait fish usually appears as a
dense cluster of individual
dots. If the return meets
certain additional criteria, a
fish symbol will be assigned.
There are three different
size fish symbols used to
indicate the intensity of the
sonar return. While signal
ID+ Fish Depth
intensity is a good indicator of relative fish size, different species of fish have
different sonar characteristics, so it is not always possible to distinguish fish size
between varying species. The signal intensity is "normalized" for depth so that
a small fish close to the boat does not appear as a large fish symbol.
ID+ adds an additional piece of information to help the user locate fish. On selected
fish symbols, the digital depth of the designated fish is drawn to help locate the fish
vertically. This is especially helpful in setting bait depths or for downrigger
operation.
11
USING THE 405SX
CONTROL FUNCTIONS
CONTROL FUNCTIONS
The 405SX uses a simple six button keypad for all user input. Press any button
and an audible “chirp” confirms the control input. If a button has no function or
is inappropriate for the situation, an audible “error” is heard. The unit sounds
multiple chirps.
Power. The Power button powers the 405SX up for normal operation. When the
unit is on, POWER turns the unit off. POWER can also be used to go directly into
Simulator mode. To enter simulator, with the unit powered off, press and hold
POWER for several seconds until a continuous chirp is heard.
Light. LIGHT controls the unit’s display backlight. With the unit powered on,
press LIGHT once to turn the backlight on “low.” Press LIGHT a second time to
turn the backlight on “medium,” a third time to turn the backlight on “high”,
and a fourth time to turn the backlight off. The backlight is very effective for low-
light and nighttime operation. When the backlight is on, the 405SX will consume
more power than with the backlight off. This is important when using the 405SX
in a portable configuration powered by a separate battery, or when powering the
unit from a trolling motor battery.
When powering the unit from a battery such as in portable
applications, you can prolong the battery life by using the
backlight at a minimum.
The three lower buttons, MENU, UP ARROW and DOWN ARROW work together
to control the 405SX menu-controlled user functions.
View. VIEW selects one of several screen configurations or
“views” possible depending on the transducer in use. When using
the standard transducer, without the optional speed/temp sensor
connected, the VIEW button toggles the display between the full-
screen 2D View and the Large Digital Readout View.
The 2D View is the default view, and the view which is first seen
at power-up. Pressing VIEW again will select the Large Digital
Readout View, which increases the size of key digital information
so that it can be viewed from a great distance. Normal 2D
information is displayed on the right side of the display. Pressing
VIEW again will toggle the display back to the 2D view.
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USING THE 405SX
CONTROL FUNCTIONS
2D View
When using the standard
transducer, with the optional
speed/temp sensor connected,
the VIEW button toggles the
display between the full-screen
2D View, the Chart View and
the Large Digital Readout View.
The Chart View, shows only the
digital depth readout, leaving
more screen area for fish
location and bottom depiction.
Menu. MENU displays a menu
on-screen for adjustment. In
normal operation, pressing
Large Digit View
MENU
repeatedly
cycles
through all available menus. A
menu remains on-screen for
several seconds, and can be
adjusted by using the ARROW
keys. If no adjustment is made
in the allotted time, the menu
disappears. If you want the
menu to remain on-screen
longer press and hold MENU—
the menu will remain on-screen
indefinitely. Once you release
the menu button, the screen
will time out. Once a menu
times out, it is still considered
the active menu. Press MENU
to bring up the last menu used.
Chart View
Arrow Keys. The UP ARROW
and DOWN ARROW make
adjustments to menu functions.
On the left side of every menu
there are UP ARROW and
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USING THE 405SX
MENU FUNCTIONS
DOWN ARROW symbols. The symbols indicate which ARROW button has a
function in a particular situation. Either one or
Menu
both ARROW buttons can be used to adjust the
menu function. A hollow ARROW symbol means
the corresponding ARROW button has no
function. Pressing that button will result in no
adjustment and the “error” audible will be
heard. A solid ARROW symbol means the
corresponding ARROW button can be used to
affect the menu adjustment.
Abbreviated Menu. The ARROW buttons often can be
used when no menu is on-screen. In these situations,
pressing the ARROW button affects the function of the
active (last-used) menu. This is a short-cut to menu
Abbreviated Menu
operation. An abbreviated menu appears on-screen while
the adjustment is made and times out. A frequently used menu can be
adjusted very quickly using this technique.
After an adjustment is made to a menu function, the menu times out after a few
seconds and the unit returns to normal operation.
Heading
Up Arrow Option
Arrow Symbols
Selected Setting
Down Arrow Option
Range of Adjustment Indicator
Menu Layout. All menus use the same basic layout. The heading at the top
describes the menu function. The UP ARROW and DOWN ARROW symbols to
the left of the menu indicate which buttons are available for adjustment. In
menus that have several possible settings, a range of adjustment indicator shows
the total range available and the current setting.
Within the menu are the options available. The selected option or current
setting is highlighted in the black box. If no adjustment is made, this is the
selected setting. Press an ARROW button while the menu is displayed to select
another option.
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USING THE 405SX
MENU FUNCTIONS
Several of the menus are multi-step. In some situations if an adjustment is
made, additional options become available for further adjustment. Examples of
these multi-step menus are Depth Range, Depth Alarm and Zoom. See the
detailed description of each function for further explanation.
Menu Functions
Sensitivity. The Sensitivity function controls the
sensitivity of the sonar receiver. The 405SX
automatically adjusts the level of receiver
sensitivity based on a number of factors including
the depth of the water and the level of noise
present. Noise can be caused by other electronic
devices, engines, trolling motors, propeller cavitation and hydrodynamic flow
among others. The user has the option of adjusting the Sensitivity higher or
lower based on personal preference. You can select one of 11 sensitivity
settings from -5 to +5. A setting of 0 (factory setting) has no effect on the auto-
matic
sensitivity
control.
Increasing
the
sensitivity
(+1 through +5) enables the unit to display the information from progressively
smaller sonar returns. By decreasing the sensitivity (-1 through -5), the unit
effectively filters small sonar
returns.
High Sensitivity (+) Sensitivity at “0”
In murky or muddy water, it is
often helpful to reduce the
sensitivity. This prevents the
display from being cluttered
with sonar returns from debris
or suspended particles. In very
clear or very deep water, it may
be helpful to increase the
sensitivity since even the
smallest sonar return may be of
interest to the user.
Low Sensitivity (-)
To adjust Sensitivity, press MENU repeatedly until the Sensitivity heading is
displayed. When the Sensitivity menu appears, use the UP ARROW to increase the
sensitivity, or the DOWN ARROW to reduce sensitivity. To sequence through the
available settings, press and hold either ARROW button. Release the button at the
setting you want to select.
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USING THE 405SX
MENU FUNCTIONS
After an adjustment is made, the menu
disappears and the new sensitivity setting is in
affect. If additional time is needed to study a
menu, press and hold the MENU button and
the menu will remain on-screen indefinitely. If
you need to make an additional adjustment,
press the UP ARROW or DOWN ARROW
button.
Depth Range. The Depth Range function
controls the vertical distance displayed on the
graphic area of the display. There are nine
depth ranges available. The top of the range is
always 0, or the surface of the water. Ranges
of 0–15', 0–30', 0–60', 0–120', 0–180',
0–240', 0–360', 0–480', and 0–600'. The range
that positions the bottom depiction closest to
the bottom of the screen, will best utilize the
available display resolution.
Using the factory setting of AUTO the 405SX
can automatically adjust the depth range
depending on the depth of the water. The unit
tries to maintain the bottom depiction about ²⁄₃
down the total range (for example, in 20' of
water, the 0-30' range would be
selected). This provides the best
display resolution and therefore
the best target separation
possible.
The Depth Range can be
adjusted manually. Press MENU
repeatedly until the Depth
Range menu is visible. Two
options are available: Auto and
Manual.
The manual setting enables you
to adjust the current depth
Depth Range
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USING THE 405SX
MENU FUNCTIONS
range setting. The unit no longer adjusts the Depth Range to the most appropriate
range for bottom display. Often, the bottom may not be visible on-screen. The
digital depth readout always determines the depth of the bottom, even if it is not
visible on-screen.
Using manual Depth Range control, you can view sonar information from the area
near the surface in greater detail.
To return to automatic Depth Range control, press the MENU button until the
Depth Range menu appears on-screen and use the UP ARROW to select AUTO.
Zoom. The 405SX uses a greatly enhanced Zoom
capability called “TruZoom” which offers
expanded information on a select area of sonar
information. Zoom is similar to Depth Range
because it controls the range of information
displayed on screen. Zoom, however, allows for
selection of ranges beneath the surface so any
area of water between the surface and the bottom can be enlarged to provide
more detailed information. By using the full display to show a small area of
coverage, the effective display resolution is increased, and the unit’s ability to
separate close targets is enhanced.
The Zoom ranges available are dependent on the
current depth range. In the 15' depth range,
TruZoom displays a range equal to one half the
current depth range. In the 30', 60', 120', 180',
240', 360', 480' and 600' depth ranges,
TruZoom displays a range equal to one fourth the
current depth range. The box at the right side of
the screen outlines the area to be zoomed.
The 405SX shows Zoom range in conjunction
with the full depth range. The Zoom range is shown on the left side of the
screen and full range information is shown on the right side of the display. The
area which is being enlarged by Zoom is indicated by the square box. Zoom can
either operate automatically, in which the Zoom range is constantly adjusted to
show the bottom, or manually, in which the user controls the location of the
Zoom range.
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USING THE 405SX
MENU FUNCTIONS
“Automatic” Zoom is especially helpful when looking
for structure or bottom detail. The “Automatic” Zoom
keeps the bottom in view even in quickly changing
terrain. “Manual” Zoom provides detailed information
of any area from the surface to the bottom.
In “Manual” Zoom, the Zoom range does not move as
the terrain changes. To operate Zoom, press MENU
repeatedly until the Zoom menu is on-screen. Three
options are available: “Off” (Factory Setting), “Auto”
(Automatic bottom tracking Zoom), and “Manual” (User
controlled Zoom range). Press the DOWN ARROW once
to highlight Auto or twice to highlight Manual. If
Manual is selected a submenu will appear allowing
manual zoom range adjustment. When the menu
disappears, full range information is displayed on the
right as always. The square box indicates the Zoom
range. In Auto Zoom, the box will move vertically to
remain in the general area of
the bottom return. The left
Upper Zoom Limit
side of the screen is
a
magnified view of the
information seen inside the
Zoom range box. The upper
and lower depth limits of the
Zoom range are shown on the
right side of the Zoom view.
Note: It is not possible to
use Zoom in conjunction
with the Large Digital
View.
Lower Zoom Limit
To disable Zoom, press the MENU button until the Zoom menu is on-screen. Use
the UP ARROW to highlight Off, and let the menu time out.
When the unit is powered off, the Zoom menu returns to Zoom Off.
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USING THE 405SX
MENU FUNCTIONS
Depth Alarm. The 405SX contains an audible
alarm to warn you of shallow water depths. The
alarm is adjustable to depths of 2' to 99'. When
the alarm is enabled, an audible alarm sounds if
the water beneath the boat is equal to or less than
the selected alarm depth. The alarm sounds
continuously for about five seconds, and then
intermittently to remind you that you are still in
shallow water. Additionally, the 405SX can
anticipate quickly changing terrain and sound
the Depth Alarm before the bottom depth
actually reaches the preset alarm depth.
Fish Alarm. The Fish Alarm alerts you to the
presence of fish, or other targets not connected
to the bottom. The Fish Alarm has three different
settings that correspond to the three different
size fish symbols shown on-screen.
The default setting is “OFF.” With the “Large
fish only” setting, the 405SX alarms on only
those targets that are represented by the large
fish symbols. The 405SX can be set to alarm on
only large and medium fish, or set to alarm on
all fish.
Once the Fish Alarm is enabled, the 405SX emits
an audible beep when the selected size fish
symbol appears on-screen.
Fish Alarm settings are remembered when the
unit is powered off.
19
USING THE 405SX
MENU FUNCTIONS
Triplog. Triplog provides a running log of
information based on input from the Temp/Speed
sensor.
Since Triplog requires information from
the Temp/Speed sensor to operate, if this
sensor is not detected by the 405SX, the
Triplog menu will not appear as an
option.
Triplog
Triplog provides four pieces of
information: the total time
elapsed since power-up or
reset, the distance traveled
since the 405SX was powered
up or reset, the average speed,
and the input voltage from
your boat’s electrical system.
The time, speed and distance
calculations are useful for
tracking your progress on a
trip. The input voltage is useful for determining the condition of the charging
system of the boat. When used in a portable application or whenever the
405SX is operated from a battery source, the voltage number can be used to
determine battery life. The 405SX will operate at voltages from 10 to 20 VDC.
Voltages in excess of 20 or less than 10 VDC cause the unit to power off. The
Triplog resets at power off.
Options. The Options Menu is a series of linked menu functions used initially
to set your preferences. Once your preferences are selected, it is unlikely these
functions need to be accessed during the normal operation of the product.
There are eight Option menus: Contrast, Units, Fish ID, Numeral size,
Transducer, Display Speed, Bottom Black and Reset. Press the view key at any
time to exit options and return to normal operation.
20
USING THE 405SX
MENU FUNCTIONS
Contrast. The Contrast function allows the user to
control the level of contrast of the LCD display. The
405SX will automatically adjust the display contrast
to compensate for changing ambient temperatures;
however, some situations may occur where manual
adjustment will provide a higher level of contrast.
Eleven contrast settings, +5 to -5, are possible. The
display contrast will change as the adjustment is
made so the optimum level of contrast can easily be
adjusted. Use the ARROW buttons to highlight the
desired selection.
Display Speed. Display Speed controls the rate at
which the graphic information moves across the
display. There are 5 possible speeds; the fastest rate
(5) is the factory setting. If your boat is stationary
or moving very slowly for extended periods, it
may be desirable to update the display at a
slower rate. The closer the update rate matches
boat speed, the more accurate is the graphic
depiction of the terrain beneath your boat.
Use the UP and DOWN ARROWS to select the
desired update rate. (1) is the slowest, (5) is the
fastest. Use the MENU button to advance to the
next menu.
The Display Speed setting is remembered when the unit is powered off.
Battery Alarm. The Battery Alarm Option allows
you to select the voltage level at which the Battery
Alarm activates. At the Battery Alarm menu (under
options), you will note that the default setting is
OFF. Push the DOWN ARROW BUTTON to select
the feature ON. Push the DOWN ARROW BUTTON
again to move into the ADJUST BATTERY ALARM
setting. Using the UP and DOWN ARROW
BUTTONS, select a voltage between 9.0 and 12.0. When the voltage drops
below your selected voltage, an audible alarm will sound, and a battery alarm
icon will be displayed on screen with current voltage level.
21
USING THE 405SX
MENU FUNCTIONS
Bottom Black. There are two selections
available: Off and On. The factory setting is
Off. With this setting, the 405SX displays
the bottom using 4 level grayscale. This
allows you to determine the texture and
relative hardness of the bottom. Selecting
Bottom Black “ON” causes the unit to
blacken in the display below
the bottom. This gives the
user easiest recognition of the
bottom location, even from a
great distance.
The 405SX remembers the
Bottom Black setting when
powered off.
Fish ID. There are three
selections available: Off, ID+
ON, and Adjust. The factory
setting is ID+ OFF. With Fish ID
Off, sonar returns are
Bottom Black View
displayed as “raw” information. There is no interpretation made by the unit.
Selecting ID ON also enables the fish alarm.
ID+ On enables the to interpret the raw sonar data and,
using a variety of techniques, depict appropriate target
returns as one of three different size fish symbols. Further
identification shows which beam the fish is detected in.
The 405SX also displays the depth beneath the surface
with the corresponding fish symbol.
ID+ On Raw Sonar
Selecting Adjust and making incremental changes
enhances the fishfinder’s ability to identify sonar
returns as fish symbols.
Increasing the value to a number greater than zero
shows more fish symbols on-screen. In this case
smaller sonar returns will be depicted as fish
symbols. This is useful for identifying many smaller
sonar returns (such as bait fish) as fish symbols.
22
USING THE 405SX
MENU FUNCTIONS
Decreasing the value to a number less than zero shows
fewer fish symbols on-screen. In this case smaller sonar
returns are disregarded. This is useful for eliminating many
small sonar returns when seeking larger species of fish.
The 405SX remembers this selection even when the
unit is powered off.
Numeral Size. Two options are available: Big and
Small. The factory setting is Big. With this setting, the
digital depth and speed and temp numerals are drawn
large enough to be read from across the boat. The big
numerals occupy space on the display that could be
used for the graphics area. Hence, the small numerals
option. With small numerals selected, a greater amount
of the display area is available for the graphic view. This
effectively increases the display resolution of the unit.
Numeral Size settings are remembered when powered off.
Units Speed. Units of Speed allows the selection of
MPH (statute miles per hour), or KTS (nautical miles per
hour). Use the Arrow buttons to highlight the desired
selection.
Speed Offset. The Speed Offset option allows the user
to compensate for differences in hull design, and its
effect on the accuracy of the speed measurement. If
there is a discrepancy between the indicated speed and
another speed measurement device on the boat, the
speed measurement can be varied to improve accuracy.
Remember, the speed paddle wheel measures speed
through the water, not speed over ground.
Speed offset is remembered after power is disconnected.
Depth Offset. The Depth Offset allows the user to select
the point on the boat from which the depth measurement
is made. Selecting a positive value adds distance to the
measurement. If the transducer is mounted 1 metre
beneath the waterline, a positive 1 will show the correct
depth from the surface of the water.
23
USING THE 405SX
USING DIAGNOSTIC
Another frequent use of depth offset is to show the depth beneath the deepest point
of the hull. A negative value equal to the distance from the transducer location and
the deepest point of the hull will have the same effect as mounting the transducer at
the deepest point.
Depth offset is remembered after power is disconnected.
Reset. With the many User Options available to
customize the 405SX, it is easy to configure the unit
in such a way that it is detrimental to a particular use.
By using the Reset function, all variable or user-
controlled features of the 405SX are returned to the
factory settings.
The Reset function is an important first step in
troubleshooting problems to ensure that a user selected setting is not the cause for
the perceived problem.
USING THE DIAGNOSTIC FEATURE
The 405SX contains a powerful diagnostic
tool that can aid in determining the cause
of a problem.
To use the Diagnostic feature, select the
Diagnostic feature on the start-up menu of
the initial screen.
Self Test. Initially, the 405SX will
perform a self-test. This test confirms
the operation of all internal circuitry.
At the conclusion of the test, one of two messages will appear. PASSED
indicates the internal test discovered no failures, FAILED indicates a
significant internal problem was discovered and the unit requires factory
service. A code number appears that tells repair personnel where the
problem is.
Transducer Connection. The first connection tested is Transducer input. If a
transducer is detected, the message CONNECTED appears. If a series of dashed
lines is shown, no transducer is connected or there is a problem with the
transducer or cable.
24
MAINTENANCE
If you are using multiple transducers, switch between transducers to confirm
the connections for each.
Voltage Input. Another connection tested is the voltage input, and is
especially helpful in diagnosing input voltage problems. The current input
voltage is displayed. If voltage fluctuations or power supply in excess of 20
VDC or less than 10 VDC is suspected, use the diagnostic screen to confirm
input voltage. Often, small outboard motors do not effectively regulate
voltage when operated at high engine speeds.
Use Diagnostic while running the boat at high speeds to show the voltage
gain. Also, if you are using the 405SX in portable configuration or from the
trolling motor battery, Diagnostic can be used to evaluate the health of the
battery by showing the present voltage.
Total Time. The total time category indicates the total time the unit has
been in use since shipped from the factory. It is normal for some hours to
appear in the total time when the unit is new due to factory testing. While
this is often of interest to the user, it is primarily a diagnostic tool for the
repair technician should the unit need service.
MAINTENANCE
Your 405SX is designed to provide years of trouble free operation with virtually no
maintenance. Follow these simple procedures to ensure your 405SX continues to
deliver top performance.
• If the unit comes into contact with salt spray, simply wipe the affected
surfaces with a cloth dampened in fresh water. Do not use a chemical glass
cleaner on the lens. Chemicals in the solution may cause cracking in the lens
of the unit.
• When cleaning the LCD protective lens, use a chamois and non-abrasive,
mild cleaner. Do not wipe while dirt or grease is on the lens. Be careful to
avoid scratching the lens.
• If your boat remains in the water for long periods of time, algae and other
marine growth can reduce the effectiveness of the transducer. Periodically
clean the face of the transducer with liquid detergent. Pivoting the
transducer up in the bracket may allow better access for inspection or
cleaning.
25
MAINTENANCE
MAINTENANCE/TROUBLESHOOTING
• If your boat remains out of the water for a long period of time, it may take
some time to wet the transducer when returned to the water. Small air
bubbles can cling to the surface of the transducer and interfere with proper
operation. These bubbles dissipate with time, or you can wipe the face of the
transducer with your fingers after the transducer is in the water.
• Never leave the 405SX in a closed car or trunk—the extremely high
temperatures generated in hot weather can damage the electronics.
TROUBLESHOOTING
Do not attempt to repair the 405SX yourself. There are no user serviceable parts
inside, and special tools and techniques are required for reassembly to ensure the
waterproof integrity of the housing. Repairs should be performed only by
authorized Humminbird technicians.
Many requests for repair received by Humminbird involve units that do not
actually need repair. These units are returned “no problem found.” If you have a
problem with your 405SX, use the following troubleshooting guide before calling
your dealer or sending your unit in for repair. The 405SX contains several tools
that can aid in determining if there is a problem and how to isolate and repair the
problem in many cases.
1. Nothing happens when I turn the unit on.
Check the power cable connection at both ends. Be sure the cable is connected
correctly to a reliable power source—red lead to positive, black lead to negative
or ground. Ensure the power available at the mount is between 10 and 20 VDC.
If the unit is wired through a fuse panel, ensure the panel is powered. Often
accessory fuse panels are controlled by a separate switch or the ignition switch.
Also, often a fuse can appear to be good when in fact is not. Check the fuse with
a tester or replace it with a fuse known to be good.
Check the power connection to the 405SX. It is possible to force the power cable
connector into the cable holder incorrectly. If the connector is reversed, the unit
will not work. Examine the contacts on the back of the unit to ensure there is no
corrosion. Finally, ensure the unit is firmly seated on the mount. The electrical con-
tacts are not made until the unit is fully seated.
Ensure the metal cable retainer is properly installed in the mount. If not, the power
connection may push out when the unit is put on the mount.
26
MAINTENANCE
MAINTENANCE/TROUBLESHOOTING
2. There is no transducer detected.
The 405SX has the ability to detect and identify that a transducer is connected.
First, ensure that an appropriate transducer connector is positioned correctly in
the connector holder, and that the unit is fully seated on the mount.
Second, inspect the transducer cable from end to end for breaks, kinks, or cuts in
the outer casing of the cable. Also ensure the transducer is fully submerged in
water. If the transducer is connected to the unit through a switch, temporarily
connect it directly to the unit and try again. If none of these items identifies an
obvious problem, the transducer itself is probably the problem. Be sure to include
the transducer if returning the unit for repair.
3. There is no bottom reading visible on the display.
There are a number of possible causes for this condition. If the loss of bottom
information occurs only at high boat speeds, the transducer needs adjusting. If the
digital depth readout is working but there is no bottom visible on-screen, it is possible
the depth range has been adjusted manually to a range lower than what is needed
to display the bottom. Also, in very deep water, it may be necessary to manually
increase the sensitivity setting to maintain a graphic depiction of the bottom.
If you are using a transducer switch to connect two transducers to the 405SX,
ensure the switch is in the correct position to connect a transducer that is in water.
(If a trolling motor transducer is selected and the trolling motor is out of water, no
sonar information appears.)
If none of the above solve the problem, inspect the transducer cable from end to
end for breaks, kinks, or cuts in the outer casing of the cable. If the transducer is
connected to the unit through a switch, temporarily connect it directly to the unit
and try again. If none of these items identifies an obvious problem, the transducer
itself may be the problem. Be sure to include the transducer if returning the unit
for repair.
4. When in very shallow water, I get gaps in the bottom reading
and inconsistent digital depth indication.
The 405SX will work reliably in water 2' or deeper. The depth is measured from
the transducer, not necessarily from the surface.
27
MAINTENANCE
TROUBLESHOOTING
5. The unit comes on before I press POWER, and won’t turn off.
Check the transducer cable—if the outer jacket of the cable has been cut and the
cable is in contact with bare metal, you need to repair the cut with electrical tape.
If there is no problem with the cable, disconnect the transducer from the unit and
see if the problem is corrected, to confirm the source of the problem.
6. I get gaps in the reading at high speeds.
Your transducer needs adjusting. If the transducer is transom-mounted, there are
two adjustments available to you—height, and running angle. Make small
adjustments and run the boat at high speeds to determine the effect. It may take
several tries to optimize high speed operation. This can also be a result of air or
turbulence in the transducer location caused by rivets, ribs, etc.
7. My unit loses power at high speeds.
Your 405SX has over-voltage protection that turns the unit off when input voltage
exceeds 20 VDC. Some outboard motors do not effectively regulate the power
output of the engine’s alternator and can produce voltage in excess of 20 volts
when running at high RPMs. The 405SX displays input voltage in the Diagnostic
screen. Use this readout to determine if the voltage exceeds 20 VDC.
8. The screen begins to fade out. Images are not as sharp as normal.
Check the input voltage using Diagnostic. The 405SX will not operate on input
voltages below 10 VDC.
9. The display shows many black dots at high speeds and high
sensitivity settings.
You are seeing noise or interference caused by one of several sources. Noise can
be caused by other electronic devices. Turn off any nearby electronics and see if
the problem goes away. Noise can also be caused by the engine. If engine noise
is causing the interference, the problem will intensify at higher RPMs. Increase the
engine speed with the boat stationary to isolate this cause. Propeller cavitation
can appear as noise on-screen. If the transducer is mounted too close to the
propeller, the turbulence generated can interfere with the sonar signal. Ensure
that the transducer is mounted at least 38cm (15") from the prop.
28
MAINTENANCE/WARRANTY
WARRANTY/SERVICE POLICY
HUMMINBIRD ONE YEAR FULL WARRANTY
First year repairs (from original date of purchase) on your 100SX are
absolutely free. This does not include physical damage to the unit or its
accessory items. Any modification or attempt to repair the original
equipment or accessories by unauthorized individuals will void the
warranty. Return the warranty registration card and retain your bill of sale
for warranty verification. Accessories not manufactured under the
Humminbird trade name are not covered by our warranty. The customer
is responsible for shipping charges to Humminbird. Humminbird will
provide ground UPS or Parcel Post shipping back to the customer free of
charge. This warranty applies to the original purchaser only.
This warranty is in lieu of all other warranties expressed or implied and no
representatives or persons are authorized to provide for any other liability
in connection with the sale of our products. Humminbird reserves the
right to perform modifications or improvements on its products without
incurring the obligation to install the changes on units previously
manufactured, sold, delivered, or serviced.
THIS IS A FULL WARRANTY AS DEFINED BY THE FEDERAL WARRANTY
ACT, EFFECTIVE JULY 4, 1975.
SERVICE POLICY
This Service Policy is valid in the United States only. This applies to
Humminbird units returned to our factory in Eufaula, Alabama, and is
subject to change without notice.
All repair work is performed by factory-trained technicians to meet
exacting factory specifications. Factory serviced units go through the same
rigorous testing and quality control inspection as new production units.
Even though you’ll probably never need to take advantage of our
incredible service guarantee, it’s good to know that we back our units
this well. We do it because you deserve the best. We will make every
effort to repair your unit within three working days from the receipt of
your unit. This does not include shipping time to and from our factory.
29
MAINTENANCE
CUSTOMER SUPPORT
Units received on Friday are usually shipped by Wednesday, units received
Monday are usually shipped by Thursday, etc.
We reserve the right to deem any product unserviceable when replacement
parts are no longer reasonably available or impossible to obtain.
After the original warranty period, a standard flat rate service charge will
be assessed for each repair (physical damage and missing parts are not
included). Please call our Customer Support Department to verify the
service charge for your unit.
If charges are not prepaid, the unit will be returned C.O.D. If you are
experiencing problems related to bottom or depth readings, please send
your transducer along with your unit when sending for repair.
CUSTOMER SUPPORT
If you have any questions, call our Humminbird Customer Support
Hotline: 1-334-687-0503
Throughout the U.S. and Canada, hours are Monday-Friday, 8:00 a.m. to
5:00 p.m. Central time.
If after reading “Troubleshooting” you determine your unit needs factory
service, please attach a description of the problem and send it with the
unit to the address below.
If you are including a check, please attach it to the unit.
Humminbird
Service Department
108 Maple Lane
Eufaula, AL 36027
Further information on Humminbird products can be found at:
30
SPECIFICATIONS
Operating Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 kHz
Power Output . . . . . . . . . . . . . . . . . . . . . . . . . 300 Watts (RMS)
2400 Watts (Peak to Peak)
Area of Coverage . . . . . . . . . . . . . . . . . . . . . . . . 24° at -10 db
Power Requirement . . . . . . . . . . . . . . . . . . . . . . . . 10 - 20 VDC
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FSTN LCD
LCD Matrix in pixels . . . . . . . . . . . . . . . . . . . . . . . 160 H x 160 V
Viewing Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4" H x 3" V
Mounting . . . . . . . . . . . . . . . . . . . . . . Quick Disconnect Mount
Unit Size . . . . . . . . . . . . . . . . . . . . . . . 7⁵⁄₈"H x 7⁷⁄₈"W x 4³⁄₈"D
Transducer (Standard) . . . . . . . . . . . . . . . . . . . . . . . . . . XT-6-24
Transducer Cable Length . . . . . . . . . . . . . . . . . . . . . . . . . . . 20'
Depth Ranges . 15', 30', 60', 120', 180', 240', 360', 480', & 600'
Zoom Ranges . . . . . . . . . . .7¹⁄₂', 15', 30',45', 60', 90', 120', 150'
31
32
Use with XT Series Transducer
Part #531055-1 Rev. 11102E
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