Humminbird 300TX manual Using the Diagnostic Feature

switch is changed. Only if the transducer is faulty do you need to manually identify the transducer in the menu.

The 300TX can work with an older dual beam transducer (model DHS-W only); however the fishfinder will not show left/right fish location. If this transducer is being used, leave the menu set to “tri-beam”.

When using a dual beam and tri-beam transducer together with a switch, leave the menu set to Tri-beam. When using a dual beam and Wide Side transducer together with a switch, manually select the correct transducer in the menu each time the switch is changed.

Bottom Black. There are two selections available: Off and On. The factory setting is Off. With this setting, the 300TX displays the bottom using Structure ID. This allows you to determine the texture and relative hardness of the bottom. Selecting Bottom Black “ON” causes the unit to blacken in the display below the bottom. This gives the user easiest recognition of the bottom location, even from a great distance.

The 300TX remembers the Bottom Black setting when powered off.

Diagnostic. Two options are available” Hide and Show. The factory setting is Hide. Selecting Show brings up the Diagnostic screen. See the Using Diagnostic section for more information.

Reset. With the many User Options available to customize the 300TX, it is easy to configure the unit in such a way that it is detrimental to a particular use. By using the Reset function, all variable or user-controlled features of the 300TX are returned to the factory settings.

The reset function is an important first step in troubleshooting problems to ensure that a user selected setting is not the cause for the perceived problem.

Using the Diagnostic Feature

The 300TX contains a powerful diagnostic tool that can aid in determining the cause of a problem.