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Introduction

Thank you for purchasing the MarCum LX-3TC multicolor sonar unit. The 
LX-3TC incorporates the latest in sonar technology, featuring a patented 
flexible zoom that can be set anywhere between surface and bottom, a patent 
pending TrueColor display, 2000 watts of peak-to-peak power, patented signal 
interference rejection and target separation down to 1 inch. Our goal is to set 
the industry standard for performance while maintaining the highest level of 
reliability. Please read this manual carefully before using your LX-3TC system. 
Only by reading this manual can you realize the maximum benefit from your 
purchase — enjoy your new LX-3TC sonar system!

General Description

The LX-3TC multi-color sonar unit utilizes three different colors within its 
display to differentiate between densities of objects. Each of the three colors 
is represented by a separate LED on the display board. This new patent 
pending TrueColor display eliminates the blending of two colors to make a 
third and results in an ultra-crisp display that greatly enhances target identi-
fication. The use of different colors in defining return signals is meant to be 
informative in indicating the size of fish, type of bottom or location of weeds. 
The interpretation of these signals improves with experience and use in the 
field. 

The LX-3TC offers 12 levels of signal Interference Rejection (IR) from nearby 
competing units. This is most prevalent in ice-fishing applications where 
anglers utilizing sonar are often grouped together within small areas. 

The LX-3tc offers a Zoom feature that allows the user to hone in on a specific 
section of water within the water column. The Zoom window (area of water 
being selected) can be set at either 5 or 10 feet on the 20- and 40-foot depth 
range, 10 or 20 feet on the 80-foot depth range, or 20- or 40-feet on the 
160-foot depth range.

This allows for a larger Zoom window to be viewed on the deeper range 
settings. The Zoom window can be moved anywhere between the surface and 
the bottom by use of the UP / DN arrow keys located on the keypad.

The LX-3TC can utilize any one of three different twenty-degree (cone angle) 
transducers. The puck-style transducer is often used for mounting on the 
bottom of trolling motors or for in-hull applications. The high-speed trans-
ducer is intended for outside the hull mounting on the transom of a boat and 
is designed for picking up depth or return signals at higher speeds. 

The ice transducer is a weighted, self-aligning transducer used for ice-fishing 
applications. Your Marcum is water and weather resistant and is designed 
to be used in the outdoors, but in extreme weather conditions, care should 
be taken to shield the monitor from driving rain and boat spray.  At no time 
should your Marcum be allowed to be in direct contact with water, and if it 
does get wet, every attempt should be made to get your system dried off as 
soon as possible. 

Summary of Contents for LX-3TC

Page 1: ...LX 3TC Multicolor Sonar Unit User Manual www marcumtech com ...

Page 2: ...Operation 4 Battery Charging 6 Some common sense safety tips 7 To charge your battery 7 Signal Interpretation 8 User Tips 9 Open Water Set Up 10 High Speed Transducer Installation 10 Puck Transducer Installation 11 Product Performance Specifications 11 Two Year Warranty 12 How to Obtain Service 12 ...

Page 3: ...of signal Interference Rejection IR from nearby competing units This is most prevalent in ice fishing applications where anglers utilizing sonar are often grouped together within small areas The LX 3tc offers a Zoom feature that allows the user to hone in on a specific section of water within the water column The Zoom window area of water being selected can be set at either 5 or 10 feet on the 20 ...

Page 4: ... for turning the LX 3TC on or off as well as choosing the correct depth range The LX 3TC offers four depth ranges to choose from that can be selected by rotating the knob clockwise The depth ranges are 20 40 80 or 160 feet The depth range setting is deter mined by turning the unit ON and turning the Gain knob looking for a solid return band of light indicating bottom on the display If no return is...

Page 5: ...g is a multiple of 4 and the 160 foot range setting is a multiple of 8 Once you use the LX 3tc a few times your brain will automatically make the adjustment without any noticeable thought process The backside of the display 6 o clock moving clockwise to 12 o clock is the other half of your split screen display This half reads what you see on the right half but in a magnified version This will grea...

Page 6: ...or depress and hold the Zoom key while turning on the unit The unit will display a simulated bottom reading RED GREEN a fish just off the bottom GREEN and a moving jigging lure indicated by a YELLOW light The simulated fish GREEN will move off the bottom and change to RED as it approaches the lure This indicates that the fish was not in the center of the transmit cone when near the bottom but as i...

Page 7: ...en not in use and avoid leaving your battery hooked up to the charger for extended periods of time To charge your battery Your battery has a wiring harness attached to it that has piggyback termi nals on it enabling you to keep the power cord from the unit attached to the battery at all times as well as having the wiring harness with receptacle for your charger attached at all times To charge simp...

Page 8: ... strengthens or weakens reflecting their location Fish that are right on the bottom can appear as part of the bottom The best indication of a fish sitting right on the bottom is that the leading edge of the bottom return signal is either GREEN or possibly a dithering or flickering RED segment It is important that the GAIN or sensitivity be kept to a minimum when displaying a strong bottom return T...

Page 9: ...rength of the targets density Denser targets return with a stronger signal displayed as RED Less dense objects small fish return a medium strength signal displayed as GREEN The least dense objects weeds bait fish lure return a weak signal displayed as YELLOW Objects on the edge of the sound cone may appear as YELLOW A fish moving through the cone may appear first as YELLOW then GREEN then RED depe...

Page 10: ...water or turbulence resulting from rivets ribs or hull strakes It is preferable to mount the transducer at least 18 inches from the centerline of the boat to avoid turbulent water resulting from the outboard motor The transducer is wedge shaped and should be mounted with the leading edge mounted against the transom The leading edge of the transducer should be mounted flush with bottom of the boat ...

Page 11: ...the bilge pump in the transom area of the boat Some boats have false bottoms or floors Mounting the transducer in a location not in direct contact with the water will result in dead air space and no sonar reading Once the correct area is located the transducer is installed using a good grade of marine epoxy For more detailed installation information refer to the directions included with the puck t...

Page 12: ... a Return Authorization Number RA or e mail us at service versae com No service returns will be accepted without this return authorization number which must be clearly marked on the outside of the package Versa Electron ics retains the exclusive right to repair or replace the unit at its discretion The customer is responsible for shipping costs associated with returning the unit to Versa Electroni...

Page 13: ...uttle Transducer Arm Ice Ducer 12 v 9 amp Battery Power Cord Battery Charger Snowshield Open water transducers Puck Hi speed Replacements for these items can be ordered off our website marcumtech com or by calling the toll free number 888 778 1208 ...

Page 14: ... equal the ultimate in portability is matched to ShowDown s proven Crystal Quick vertical display The sonar instantly locks on to bottom and clearly displays the location of fish and your lure anywhere in the water column VS825SD The VS825sd offers several technologies that are the first of their kind making this system the most technologically advanced underwater viewing system available Using ne...

Page 15: ...www marcumtech com 15 ...

Page 16: ...www marcumtech com MarCum User Manuals are available for download from www marcumtech com ...

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