Lowrance 1240A User Manual

1240A

IN-DASH MOUNT SONAR

INSTALLATION AND

OPERATION INSTRUCTIONS

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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.)

To mount the 1240A, first make certain there is clearance behind the dash
in the desired location. (See below for the unit's dimensions.) Also, be sure
there is enough room to connect power and attach the transducer connec­tor at the rear of the unit. At least 5 1/4" are needed from the front surface
of the dash to clear all connectors and wiring. Once you've decided on the
mounting location, mark the spot.

Next, determine where to mount the control. Select an area with sufficient
space for the control decal on the front and enough depth behind the panel
for the control. The maximum panel thickness the control will attach to is
5/8". Make certain the control's cable will reach the display. Mark the spot
for the control.

Using a 3 3/8" hole saw, drill the display mounting hole. The display's bezel
will overlap the hole by 5/16", hiding minor chipping which may occur when
drilling the hole in fiberglass.

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. Remove the paper backing from the decal to expose the adhesive
and place it over the control's mounting location. Make certain the holes in
the decal and dash are aligned.

Mounting hardware for the control, consisting of two nuts, lockwashers,
and flat washers are supplied in the hardware pack. First, thread a nut onto
the shaft. The amount of threading depends on the thickness of the dash.
Place a lockwasher and a flat washer on the shaft. Insert the control in the
hole from the back side of the dash and place another flat washer and lock
washer onto the shaft. Thread the other nut on, but don't tighten it yet. Place
the large knob onto the shaft and tighten the set screw enough to lock it into
position on the flat side of the shaft. With the switch in the far left "OFF"
position, rotate the control so that the pointer on the knob aligns with the
"OFF" position on the decal. When it's properly positioned, slide the knob
off and tighten the nut on the control. About 1 1/2 threads should show
beyond the nut on the front of the dash. Place the foam washer and large
knob over the shaft and tighten the knob's setscrew. Place the small knob
onto the shaft, align the setscrew with the flat on the shaft, leave a small
gap between the small knob and the large one and tighten its setscrew.