240A IN-DASH MOUNT SONAR INSTALLATION AND OPERATION INSTRUCTIONS http://www.lowrance.
INSTALLATION MOUNTING Your 1240A is designed for convenient mounting the dash of your boat, or it can be mounted on any flat panel that's at least four inches in diameter. If the sonar is to located in the vicinity of a magnetic compass, run it in position temporarily to make certain it doesn't affect the compass readings. If the compass heading changes, choose an alternate location. (Note: The sonar must be running when you make this test.
Now drill the hole for the control. Use a 3/8" drill bit. MAKE CERTAIN THAT ALL HOLES ARE DRILLED PERPENDICULAR TO THE MOUNTING SURFACE AND NOT AT AN ANGLE. A "U" bracket is supplied to hold the sonar to the dash. Place it over the studs on the back of the unit and secure it using the nylon wing nuts provided. If the "U" bracket is too long, it can be cut to the desired length with a saw. Before mounting the control, clean the mounting surface for the control decal.
POWER CONNECTION 12-volt DC power for the 1240A is supplied from the boat's 12-volt electrical system. You can connect the power either from an existing fuse block that's behind the dash or directly to the battery. An in-line fuse holder is supplied with the unit in case a fuse is not available. Attach the fuse holder as close to the power source as possible. This will help protect both the unit and the power cable in the event of a short circuit.
If you're in doubt about the depth, turn the unit off until the scan disc stops. Turn it back on and watch to see if the bottom signal completes one revolution before stopping. If it does, the present water depth is the depth shown plus 100 feet. If the signal travels around the dial two times, the water depth is the depth shown plus 200 feet. SENSITIVITY Vary the sensitivity by rotating the small knob. It works similarly to the volume control on a radio.
signal appears at 10 feet on the dial. As it's turned up more, this signal will get wider and other smaller signals from fish (if present) appear between 0 and 10 feet. The bottom signal gets wider because you are seeing more bottom area. Remember that the true depth is always the shallowest edge of the bottom signal, NOT the middle. As you turn the sensitivity up more, another signal appears at 20 feet on the dial, double the depth of the first signal.
LOWRANCE ELECTRONICS FULL ONE-YEAR WARRANTY “We", “our”, or “us” refers to LOWRANCE ELECTRONICS, INC., the manufacturer of this product. “You” or “your” refers to the first person who purchases this product as a consumer item for personal, family, or household use. We warrant this product against defects or malfunctions in materials and workmanship, and against failure to conform to this product’s written specifications, all for one year (1) from the date of original purchase by you.
How to Obtain Service - U.S.A. Only We back your investment in quality products with quick, expert service and genuine Lowrance® replacement parts. If you're in the United States and you have questions, please contact the Factory Customer Service Department using our toll-free number listed below. You must send the unit to the factory for warranty service or repair. Please call the factory before sending the unit. You will be asked for your unit's serial number.
