Lowrance 3500 User Manual

3500

Installation and Operation

Instructions

The 3500 is a high-performance digital sonar. It works only off the bottom signal and it's operation is completely automatic. There are no sensitivity or noise controls. All of this is made possible by the computer built inside. This unit fits in a standard 2 1/8" (54 mm) hole used by most marine equipment manufacturers.

Mounting

The 3500 needs at least 2 1/2" (64 mm) of space to mount on any flat panel or dash. To install the unit, also make certain there is at least 3 3/4" (95 mm) from the

front

of the dash to any obstruction behind the dash. Check to be sure there is room to route the power and sensor cables. The ness is 1 1/8" (28.5 mm).

maximum

usable dash thick-

23456

3 3/4" minimum

clearance

SCREW

DASH

TIGHTEN THESE SCREWS

When you determine the location for the 3500, drill a 2 1/8" (54 mm) hole in the dash. Slide the 3500 through the hole from the front of the dash. Align it so that it's straight, then tighten the two screws with a phillips-head screwdriver.

To prevent damage to the unit, DO NOT use a pneumatic/power screwdriver. Use a hand-held screwdriver and the torque should not exceed 7 in lbs. Also, when removing the unit, do not back the screws out of the case. Damage to the faceplate will result. We recommend backing off the screws one complete turn before attempting to remove the unit. If further loosening of the screws is required, do so in half-rotation increments.

Place the push-button into the holes in the bezel and snap it on to the 3500. The unit is now ready for wiring.

CAUTION!

WIRING

Connect the wires as shown in the diagram on the next page. The 3500 operates from 10 to 15 vdc (12-volt system). You can connect the wires as shown in the diagram at the top of the page using two accessory switches (not included), which switches the unit's lights on separately from the power, or you can wire the lights to the power switch as shown at the bottom of the page. (The white wire on the power cable is connected to the lights.) Regardless of which wiring method you use, the 3500 must be wired to a 3-amp fuse! Failure to fuse this product will v oid the warranty and could result in damage to the unit or your boat.

The unit won't be harmed if the power wires are connected backwards, howev er, it won't work until they're properly connected.

Find a location for the speaker that is protected from the elements, but still lets you hear it. The typical mounting location is behind the dash. Make certain to wire the speaker's wires to the same color wires on the 3500's speaker cable - red to red and black to black. If the 3500's wires won't reach the speaker, splice ordinary speaker wire to them.

TRANSDUCER

The 3500 can use any Lowrance 192 kHz transducer with gray connectors. For the best performance, we recommend a transducer with a narrow (8°) cone angle. See y our transducer o wner's manual f or installation instructions.

OPERA TION

Since the 3500 is an automatic sonar, all y ou hav e to do is turn it's power on. It will giv e you a water depth reading within seconds . Once it finds the bottom, the 3500 locks onto it and automatically adjusts the sensitivity and noise suppression circuits. It will tr ac k the bottom at speeds o ver 70 m.p.h..

Feet/Meters

You can view the water depth in feet or meters. When the 3500 is first turned on, the depth is in feet. To change it to meters, simply press the left arrow key. To switch back to feet, press the left arrow key again. The display shows the depth in tenths of a f oot when the water depth is below 100 feet. It shows the depth in tenths of a meter below 100 meters. The letters "FT" or "M" appear at the bottom of the display, depending if the unit is in feet (FT) or meters (M).

If the 3500 loses the bottom signal for any reason, it flashes the last known water depth until it reacquires the bottom signal.

RED

SPEAKER

CABLE

DASH

BLACK

POWER

CABLE

TRANSDUCER

CABLE

WHITE

TRANSDUCER

BLACK

LIGHT

SWITCH

(NOT

INCLUDED)

WHITE

RED

POWER

SWITCH

(NOT

INCLUDED)

POWER

SWITCH

(NOT

INCLUDED)

3-AMP FUSE

12-VOLT

BATTERY

RED

BLACK

3-AMP FUSE

12-VOLT

BATTERY

+ 4 hidden pages