Humminbird TFX128 Operation Manual
TFX128
Operations Manual
Thank you for choosing Teleflex for your sonar fishfinder and depthsounder.
Teleflex Marine has built its reputation by designing and manufacturing top-quality,
thoroughly reliable marine equipment. Your Teleflex is designed for trouble-free use
in even the harshest marine environment.
In the unlikely event that your Teleflex does require repairs, we offer an exclusive
Service Guarantee - free of charge during the first year after purchase, and
available at a reasonable rate after the one-year period. Complete details are
included at the end of this manual.
We encourage you to read this operations manual carefully in order to get full
benefit from all the features and uses of your Teleflex product. Also, to register
your purchase and help us learn more about you, please fill out the included
warranty registration card
WARNING! This device should not be used as a navigational aid to prevent
collision, grounding, boat damage, or personal injury. When the boat is
moving, water depth may change too quickly to allow time for you to
react. Always operate the boat at very slow speeds if you suspect shallow
water or submerged objects..
THANK YOU
WARNING:
Dis-assembly and repair of this electronic unit should only be performed by authorized service personnel.
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.
Section 1: USING THE 128 SERIES . . . . . . . . . . . . . . . . . . . 2
How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Simulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Feature Memory. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
What You See On Screen . . . . . . . . . . . . . . . . . . . . . . 4
Control Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Control Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Control Menus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Section 2: MAINTENANCE AND WARRANTY. . . . . . . . . . . 16
Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Customer Support . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
TABLE OF CONTENTS
USING THE 128 SERIES
HOW SONAR WORKS
2
2
HOW SONAR WORKS
Your Teleflex 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 Teleflex 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
Teleflex 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' (185m) and back again in less than
¹⁄₄ of a second. It is unlikely
that your boat can "outrun" this sonar signal.
The
128 is a single frequency, single beam unit, and generates a 20°
symmetrical cone of sonar coverage at 200kHz. The 20° coverage shows
excellent bottom detail with a greater depth capability than wider beams.
The sonar return shows the most current information at the right of the
screen and draws a history of the information as it scrolls across to the left.
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
USING THE 128 SERIES
SIMULATOR OPERATION
3
SIMULATOR OPERATION
All128 Series fishfinders contain 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 fishfinder.
To use the simulator, with the unit off, press
and hold the GAIN P
USH POWER / LIGHT knob
for approximately three seconds* until you
hear a continuous chirp. When in simulator
operation, the
128 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 S
IMULATOR mode, power the unit off.
When in SIMULATOR mode, the word
“
SIMULATOR” occasionally flashes on the display indicating the
information on-screen is not real sonar data.
FEATURE MEMORY
Many changes you make to the set-up or user options (see Control
Functions) are retained in the unit’s memory. This allows you to use the
S
IMULATOR mode to experiment with the various set-up options. Change to
normal operating mode, make the same changes to the
128 settings,
they are retained for the next time you use the
128.
*A short push will turn the 128 ON in the normal operating state.
USING THE 128 SERIES
WHAT YOU SEE ON-SCREEN
Note: Settings are not retained when made in SIMULATOR MODE.
Changes are retained in feature memory only when made when
the unit is in the normal operating mode."
WHAT YOU SEE ON-SCREEN
Your 128 uses a 128 x 64 matrix FSTN LCD display. This display provides
outstanding viewability in all light conditions over a wide range of
temperatures.
At initial power-up, the
128 uses
settings that were set at the factory.
After initial use, the
128 will
remember many of the settings you
enter.
There are several elements on-screen
that are common to all modes of
operation.
SPEED/TEMPERATURE. The initial screen
layout takes one of two basic forms
depending on whether the optional
Speed/Temp accessory is installed.
Figure A shows the default view
when the Speed/Temp accessory is
installed. Figure B shows the default
view when the Speed/Temp accessory is not installed.
DEPTH. The digital depth number shows the water depth directly beneath
the transducer location.
4
Figure A
Water Depth
Depth Range
Water Temperature
Speed
5
DEPTH RANGE. The depth range is
shown to the right of the screen. The
upper number is 0 indicating the
transducer position. 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.
When in Auto mode, the horizontal
line at the top of the screen is the
“zero line,” representing the
transducer location. Occasionally
there is a gap in this line. This gap
indicates the unit is updating the
display even if the bottom is not
visible on-screen, or if the bottom information is not changing.
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
128 can automatically select the
appropriate depth range to show
the depth of water beneath the
transducer. 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 an effective tool
for understanding the composition
of the bottom. 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 much of the signal is
USING THE 128 SERIES
WHAT YOU SEE ON-SCREEN
Water Depth
Bottom Depiction
Depth Range
Figure B
Zero Line
Rocky Bottom
Soft Bottom Hard Bottom
USING THE 128 SERIES
WHAT YOU SEE ON SCREEN
6
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
128 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 structure is
to operate the
128 over a variety of known conditions and experiment
with the user functions GAIN and
the Chart Speed and FILTER Control
Panels 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 individual dots near the “0” line.
Thermocline Second Return
Surface clutter Structure
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