Minelab F3 Service Manual page 19


Turn on the detector with the black endcap attached.

Conduct the test piece test and note the number of LEDs that light up as well
as the tone and volume of the audio.

Increase the volume to maximum by pressing the
for the longer beep on the fifth press (indicating maximum Volume/Sensitivity).

Recheck the detector with the test piece, confirming an increased number of
LEDs light up and the tone is louder.

Decrease the sensitivity to normal by pressing the Θ button five times listening
for the double beep on the fifth press.
has returned to its default setting.

Decrease the detector sensitivity to minimum by pressing the Θ button five
times listening for the longer beep on the fifth press (Indicating lowest
Volume/Sensitivity).

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
Procedures.
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 sequence.

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
button five times listening
This indicates the detector sensitivity
NOTE
5 Fault Finding Procedures.
Page 19
F3 Service Manual
5 Fault Finding