Minelab F3 Service Manual download pdf (Page 8)

F3 Field Service Manual

Page 8

● During the 45 seconds, the detector scans the environment searching for the source

of any electrical interference. Once detected, the F3 will automatically select a

different operating frequency to eliminate or reduce the interference.

● If the correct sequence of Noise Cancel beeps is not heard, refer to Section 4 for

faultfinding procedures.

d. Audio Reset Test. This test confirms the audio reset button (also the ground

balance button), wiring loom and electronics pack are functioning correctly. The objective is

to ensure the Threshold Tone returns to its correct volume if altered from its steady state.

The test is conducted as follows:

● Hold the coil at least 600mm (24ins) off the ground and away from any metallic

objects.

● Induce a Threshold Tone rise in volume by collapsing the lower shaft into the middle

shaft. Alternatively, slowly move the coil toward a metal object and once the

Threshold Tone increases in volume, hold the detector stationary.

● Once the Threshold Tone has increased in volume, press and

immediately release

the green ground balance button. (Figure 5)

NOTE

If the ground balance button is not immediately released, the F3 will commence the Ground

Balance procedure.

Figure 5: Audio Reset

● Within two seconds the Threshold Tone should return to its correct level.

● If the threshold tone does not return to the correct level, refer to Section 4 for

faultfinding procedures.

e. Ground Balance Test. This test confirms the detector is capable of ground

balancing against mineralised ground. In doing so, it confirms the correct operation of the

ground balance button, wiring loom and coil. The test is conducted as follows:

● Ensure hands and arms are free of metallic objects (watches, rings etc), and that no

other metallic objects are near the coil.

● Keeping the detector stationary, press and hold the ground balance button for five

seconds then release the button.

NOTE

This action will cause the F3 to delete the previously stored ground balance condition.

Unless this is done, the detector will remember its last ground balance condition regardless

of the unit being switched off or the batteries removed.

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Minelab F3 Service Manual Page 8