Minelab F3 Service Manual download pdf (Page 10)

F3 Field Service Manual

Page 10

Figure 7: Connecting the Earset

● 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 also be

heard from the detector loudspeaker.

● 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.

NOTE

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 4 for faultfinding procedures.

g. 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 4 for faultfinding procedures.

NOTE

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.

h. F3L - LED and Volume Control Test. For the F3L configuration, LED and volume

control is tested as follows:

● Turn on the detector with the black endcap fitted.

● Conduct the test piece test and note the number of LEDs that light up and the tone

and volume of the audio.

● Increase the volume to maximum by pressing the

button five times listening for the

longer beep on the fifth press.

● 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. This indicates the detector sensitivity has returned to

its default setting.

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Minelab F3 Service Manual Page 10