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4. When in very shallow water, I get gaps in the bottom reading
and inconsistent digital depth indication.

The 

128

will work reliably in water 3' or deeper. The depth is measured

from the transducer, not necessarily from the surface.

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 

128

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. Check the
input voltage with a volt meter while operating the engine at various
speeds to confirm input voltages.

8. The screen begins to fade out. Images are not as sharp as
normal.

The 

128

will not operate on input voltages below 10 VDC. Check the

input voltage at lower engine speeds for under voltage.

MAINTENANCE AND WARRANTY

TROUBLESHOOTING

Summary of Contents for TFX128

Page 1: ...TFX1 28 Operations Manual...

Page 2: ...er 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 bo...

Page 3: ...eration 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 Pol...

Page 4: ...onar is very fast A sound wave can travel from the surface to a depth of 600 185m and back again in less than of a second It is unlikely that your boat can outrun this sonar signal The 128 is a single...

Page 5: ...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 flashes on...

Page 6: ...t 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 in...

Page 7: ...ormation 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 a...

Page 8: ...e 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...

Page 9: ...as a fish arch A fish arch forms as the fish moves through the sonar beam Due to the transducer beam angle the distance to the fish decreases as it moves into the beam and then increases as it moves o...

Page 10: ...merged trees an area just above a ledge or therm ocline Adjusting gain down from a higher setting until noise and clutter is removed from the screen is a good initial setting See the Filter Control Pa...

Page 11: ...g the 128 in a portable configuration powered by a separate battery or when powering the unit from a trolling motor battery 4 GAIN can also be used to go directly into SIMULATOR mode To enter simulato...

Page 12: ...can be used when no menu is on screen In these situations rotating the RANGE knob affects the setting of the highest level function available This is a short cut to menu operation In manual depth sel...

Page 13: ...ettings available in another menu See Zoom for further explanation CONTROL PANELS DEPTH RANGE The Depth Range function controls the vertical distance displayed on the graphic area of the display There...

Page 14: ...t 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...

Page 15: ...Zoom range is 7 If the 60 or 120 range is in use the Zoom range is 15 if a 180 480 depth range is in use the Zoom range is 30 and if the 600 range is in use the Zoom range is 60 The Zoom range is sho...

Page 16: ...NEL Knob again to return to the sonar window When the unit is powered off the Zoom menu returns to Zoom Off DEPTH ALARM The 128 contains an audible alarm to warn you of shallow water depths The alarm...

Page 17: ...alls within the sonar cone However this extreme sensitivity requires you to optimize the installation of your unit and transducer so that noise generated by a moving boat is not picked up by the fishf...

Page 18: ...oat 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 hot water Pivoting the...

Page 19: ...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...

Page 20: ...ible 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 o...

Page 21: ...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 ca...

Page 22: ...lude 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 warran...

Page 23: ...fort 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 Units received on Friday are usually shipped by Wednesday u...

Page 24: ...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 I...

Page 25: ...a of Coverage 20 at 3 db Power Requirement 10 20 VDC Display FSTN LCD LCD Matrix 128 V x 64 H Viewing Area 2 90 V x 2 35 H Mounting In Dash or Gimbal Unit Size 6 H x 6 W x 4 D Transducer Standard TZ16...

Page 26: ......

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