Minelab F3 Service Manual page 18

F3 Service Manual

Switch the F3 on and confirm the threshold tone is audible.

If an Earset 'speaker on' (4523-0027) is being tested, check that tones can be
heard from both the detector loudspeaker and the Earset.

If an Earset 'speaker off' (4523-0025), identified by green band on earset cable
near the plug is being tested, check that no tones can be heard from the
detector loudspeaker and the audio tones can be heard only from the earset.
If the detector being serviced is an F3L configuration (contains LEDs on handle
assembly), the LEDs should illuminate when using an Earset 'speaker on' and
extinguish when using an Earset 'speaker off'.

If a fault is discovered refer to section
f. Alarm Tone Test. This test will produce an alarm when either the red endcap
or yellow endcap is dislodged. This is a safety feature designed to ensure the detector
operates at the correct level of sensitivity. To conduct the test:

With a red or yellow endcap fitted and the detector switched on, remove the
endcap and confirm that a continuous cycling alarm tone is produced.

If an alarm tone does not occur refer to section
The red and yellow endcaps are detected by the electronics pack due to magnets
located within the endcaps. The black endcap has no magnets and represents the
default sensitivity of the F3. This means the black endcap, if dislodged, will not
cause an alarm because the detector is already operating at the default sensitivity.
g. F3L - LED and Volume/Sensitivity Control Test. This test will confirm the
LEDs and the Volume/Sensitivity controls are operating correctly. For the F3L
configuration, LED and volume control is tested as follows:
Figure 8: Connecting the Earset.
NOTE
5 Fault Finding Procedures.
NOTE
Page 18
5 Fault Finding Procedures.