Minelab F3 Service Manual download pdf (Page 11)

F3 Field Service Manual

Page 11

● Decrease the detector sensitivity to minimum by pressing the Θ button five times

listening for the longer beep on the fifth press.

● Check the detector with the test piece and confirm there is no audio or LED indication

to the test piece with detector set to its minimum sensitivity.

● If the correct LED/volume responses are not achieved, refer to Section 4 for

faultfinding procedures.

NOTE

Regardless of minimum sensitivity, at least one LED will remain illuminated provided an

earset speaker off is not connected to the detector.

● Switch the F3 off and on – this will revert the detector to default sensitivity. Move the

detector coil over a large metal target checking that the LEDs light up in the correct

way.

● Check that the LEDs can be extinguished by pressing and holding Θ button then

quickly pressing and releasing the green ground balance button.

● Once extinguished, check the LEDs can be illuminated by pressing and holding the

button and quickly pressing and releasing the green ground balance button.

● If any fault is detected, refer to Section 4 for faultfinding procedures.

i. Test Piece Test. This is a critical test and should be conducted last to confirm the

detector is performing correctly and at an acceptable sensitivity level. It should be

conducted in an environment that is free from electrical interference and an earset must be

connected. 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. Switch the detector on and confirm a steady

threshold tone is present.

NOTE

Maximum sensitivity is only available 30 seconds after the threshold tone is heard. Do not

test the detector with the test piece until 30 seconds after the threshold tone is heard.

● Black Endcap. Ensure the black endcap is securely fitted to the electronics pack.

Conduct the test as follows:

- Hold the test piece above the middle of the coil with the rounded end

(containing metallic target) away

from the coil.

- Move the test piece towards the centre of the coil until it lightly touches the

coil then move it sideways off the coil. (Figure 8)

- Confirm a faint but clear response (change in threshold tone volume and

pitch) is heard.

Figure 8: Test Piece Test

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Minelab F3 Service Manual Page 11