Humminbird 350TX 350TX User manual

WARNING: Dis-assembly and repair of this electronic unit should only be performed
by authorized service personel. Any modification of the serial number or attempt to
repair the original equipment or accessories by unauthorized individuals will void the
warranty. handling and/or opening this unit may result in exposure to lead, in the form
of solder.
Warning: This product contains lead, a chemical known to the State of
California to cause cancer and birth defects and other reproductive harm.

INSTALLATION PREPARATION . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PARTS SUPPLIED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . 2
ALTERNATIVE TRANSDUCERS AND MOUNTING METHODS . 4
TRANSDUCER EXCHANGE . . . . . . . . . . . . . . . . . . . . . . . . 5
USING THE 350TX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
HOW SONAR WORKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SIMULATOR OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WHAT YOU SEE ON SCREEN . . . . . . . . . . . . . . . . . . . . . . . 8
CONTROL FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MENU FUNCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ADVANCED FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
USING THE DIAGNOSTIC FEATURE . . . . . . . . . . . . . . . . . . 25
USING ALTERNATIVE TRANSDUCERS . . . . . . . . . . . . . . . . 26
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
CUSTOMER SUPPORT . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
TABLE OF CONTENTS
Rev. 11016E

2
INSTALLATION PREPARATION
PARTS SUPPLIED
PARTS SUPPLIED
Before installing your 350TX, please ensure the following parts are included
in the box:
• 350TX fishfinder
• Transducer with 6m (20') of cable and mounting hardware kit
• Mounting system and mounting hardware kit
• 2m (6') power cable
• Publications kit
If any of these items is missing, contact your local Humminbird dealer.
ACCESSORIES
Humminbird offers a wide assortment of accessories that complement and
expand the capability of your new 350TX. These accessories are designed
with the same high standards and are backed by the same one-year
warranty. 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 350TX 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.
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

3
INSTALLATION PREPARATION
INSTALLATION OVERVIEW
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 350TX includes a model XT-6-TB-90
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 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 character-
istics 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). Also, any air
trapped in the lamination of the
fiberglass would prevent the sonar
signal from passing through.
Transom Mounted Transducer
Inside the Hull Mounted Transducer

4
Inside the hull installations require no holes 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 350TX 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.
Thru-Hull Mounting
Thru-hull transducers install through a hole
drilled in the hull of the boat. Larger boats or
boats with inboard motors create turbulence
that make transom mounting ineffective. Also,
hulls that are very thick or are double layered, or
made from materials such as wood or metal,
(which do not conduct sonar signals) make
inside the hull mounting inadvisable.
INSTALLATION PREPARATION
ALTERNATE TRANSDUCERS AND MOUNTING METHODS

Thru-hull mounting may require the use of a fairing block to level the
transducer with the waterline. Also, since special tools and knowledge may
be required to perform this type of installation it is best to refer to a
qualified marine technician.
TRANSDUCER EXCHANGE
Other transducers are available as replacements for the standard
transducer. You may exchange your new and unassembled transducer for
another type. Contact your local distributor for details. Some transducers
may have additional costs. Refer to the Accessory catalog or call your
distributor for information.
BEGINNING INSTALLATION
Now that you have determined the transducer mounting method, you can
begin installation of the 350TX. 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 using the
XT-6-TB-90, you will need the mounting template at the rear 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)
INSTALLATION PREPARATION
TRANSDUCER EXCHANGE
5

USING THE 350TX
HOW SONAR WORKS
6
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
70m (240') and back again in less than ¹⁄₄ of a second. It is unlikely that
your boat can "outrun" this sonar signal.
The 350TX is a dual frequency, tri-beam unit, and generates three distinct
sonar signals - one narrow, two wide. Each signal is optimized for a
particular purpose. First, the center beam transmits at a frequency of
200 kHz in a 20°(narrow) symmetrical pattern for greater depth capability
and excellent detail. Information from this center beam is used to draw the
graphic representation of the bottom on the display.
The left and right beams are generated at 455 kHz for increased sonar
resolution and are shaped in an elliptical pattern for greater area of
coverage. (45ºside to side, and 16ºfront to back.) Information from these
two beams in conjunction with the center beam is used to accurately
detect the presence and location of fish.
The combination of the three beams and dual frequencies, provides the best
possible combination of a large area of coverage and a high level of detail.

7
USING THE 350TX
SIMULATOR OPERATION
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 350TX 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 350TX.
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 the DOWN ARROW until “Simulator”is highlighted. When the
screen times out, the unit will be in simulator mode.
When in simulator operation, the 350TX 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.
When in simulator mode, the word “simulator” occasionally
scrolls across the display indicating the information on-screen is
not real sonar data.
FEATURE MEMORY
If your 350TX 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 350TX in Simulator when no transducer is connected,
any selected options are lost when the unit is powered off. The 350TX 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 350TX 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 350TX uses a 128 V x 64 H
matrix FSTN LCD display. This display
provides outstanding viewability in all
light conditions over a wide range of
temperatures.
At initial power-up, the 350TX uses
settings that were set at the factory.
After initial use, the 350TX will
remember the settings you enter.
There are several elements on-screen
that are common to all modes of
operation.
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 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-screen.
8
USING THE 350TX
WHAT YOU SEE ON-SCREEN
Figure A