Humminbird SINGLEBEAM 405SX User manual

405SX SINGLEBEAM
OPERATIONS MANUAL
fishfinder

THANK YOU FOR CHOOSING YOUR 405SX FISHFINDER, MADE BY
TECHSONIC INDUSTRIES, MANUFACTURER OF AMERICA’S #1 NAME IN
FISHFINDERS, HUMMINBIRD. HUMMINBIRD HAS BUILT ITS REPUTATION
BY DESIGNING AND MANUFACTURING TOP QUALITY, THOROUGHLY
RELIABLE MARINE EQUIPMENT. YOUR HUMMINBIRD PRODUCT IS
DESIGNED FOR TROUBLE-FREE USE IN EVEN THE HARSHEST MARINE
ENVIRONMENT.
IN THE UNLIKELY EVENT THAT YOUR HUMMINBIRD DOES REQUIRE
REPAIRS, WE OFFER AN EXCLUSIVE SERVICE GUARANTEE. COMPLETE
DETAILS ARE INCLUDED AT THE END OF THIS MANUAL.
WE ENCOURAGE YOU TO READ THIS OPERATIONS MANUAL CAREFULLY
IN ORDER TO GET FULL BENEFIT FROM ALL THE FEATURES AND USES OF
YOUR Humminbird PRODUCT.
WARNING! THIS DEVICE SHOULD NOT BE USED AS A
NAVIGATIONAL AID TO PREVENT COLLISION, GROUNDING,
BOAT DAMAGE, OR PERSONAL INJURY. WHEN THE BOAT IS
MOVING, WATER DEPTH MAY CHANGE TOO QUICKLY TO
ALLOW TIME FOR YOU TO REACT. ALWAYS OPERATE THE BOAT
AT VERY SLOW SPEEDS IF YOU SUSPECT SHALLOW WATER OR
SUBMERGED OBJECTS.
THANK YOU
WARNING: Dis-assembly and repair of this electronic unit should only be performed by authorized
service personnel. Any modification of the serial number or attempt to repair the original equipment or
accessories by unauthorized individuals will void the warranty. Handling and/or opening this unit may
result in exposure to lead, in the form of solder.
WARNING: This product contains lead, a chemical known to the State of California to
cause cancer and birth defects and other reproductive harm.

Section 1: Installation preparation . . . . . . . . . . . . . . . . . . . 2
Parts Supplied . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation Overview . . . . . . . . . . . . . . . . . . . . . . . . . 2
Alternative Transducers and Mounting Methods. . . . . . 4
Beginning Installation . . . . . . . . . . . . . . . . . . . . . . . . . 5
Section 2: USING THE 405SX. . . . . . . . . . . . . . . . . . . . . . . 6
How Sonar Works . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Simulator Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 6
What You See On Screen . . . . . . . . . . . . . . . . . . . 7–11
Control Functions . . . . . . . . . . . . . . . . . . . . . . . . 11–15
Menu Functions . . . . . . . . . . . . . . . . . . . . . . . . . 15–25
Section 3: ADVANCED FEATURES. . . . . . . . . . . . . . . . . . . 24
Using Diagnostic . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Section 5: MAINTENANCE/WARRANTY. . . . . . . . . . . . . . . 25
Maintenance and Troubleshooting . . . . . . . . . . . . 26–28
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Service Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Customer Service . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
TABLE OF CONTENTS
Rev 10416E

2
INSTALLATION PREPARATION
PARTS SUPPLIED
PARTS SUPPLIED
Before installing your 405SX, please ensure the following parts are included in
the box:
•405SX fishfinder
•Transducer with 20' of cable and mounting hardware kit
•Mounting system and mounting hardware kit
•6' power cable
•Publications kit
Note: The 405SX includes a temperature sensor and the 405SX+
includes speed and temperature sensors with appropriate
hardware and instructions for installation.
If any of these items is missing contact your local dealer.
ACCESSORIES
Humminbird offers a wide assortment of accessories that complement and
expand the capability of your new 405SX. These accessories are designed with
the same high standards. The Humminbird Accessory catalog included with
your unit contains descriptions of the many accessories available and ordering
information. All Humminbird accessories are available through your full-service
Humminbird dealer.
INSTALLATION OVERVIEW
The 405SX consists of two primary components to install: the control head and
the transducer.
The control head contains the sonar transmit and receive circuitry, as well as the
user controls and display. It should be installed in a location that provides access
to the controls and visibility while in use. The control head mounts on a quick
disconnect mounting system that swivels and tilts, providing flexibility for
viewing from almost anywhere on the boat.

3
INSTALLATION PREPARATION
INSTALLATION OVERVIEW
The transducer converts electrical energy from the transmitter into mechanical
pulses or sound waves. The transducer also receives the reflected sound waves
and converts them back into electrical signals for display on the control head. It
should be installed in contact with the surface of the water in an area that has
smooth water flow - usually on the transom of the boat. There are several
mounting options for the transducer. Review the
following section to determine the method that
works for you and your boat.
Determining How to Mount the
Transducer
The 405SX includes a model XT-6-24 transducer.
This transducer can be mounted on the transom
of the boat, or bonded to the inside of a
fiberglass hull boat.
The transom installation, which is the most
widely used, places the transducer on the outside
of the boat hull. This technique produces the
least signal loss, and provides a way to adjust the
transducer after installation. The mounting
hardware included is designed to
protect both the boat and the
transducer should the boat strike
debris in the water or when trailering.
As an alternative to transom mounting,
it is possible on many fiberglass-hulled
boats to glue the transducer on the
inside of the boat hull. Since fiberglass
has similar sonar characteristics as
water, the sonar signal can pass
through the boat hull with minimal
loss. The hull of the boat must be single
layer construction (not double-hulled).
Also, any air trapped in the lamination
of the fiberglass would prevent the
sonar signal from passing through.
Inside the Hull Mounted Transducer
Transom Mounted Transducer
For additional details reference the
TRANSDUCER INSTALLATION section of
the enclosed Installation Sheet.