Minelab F3 Service Manual page 20

F3 Service Manual
h. 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.
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

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, as shown in figure 9.
- Confirm a faint but clear response (change in threshold tone volume and
pitch) is heard.
- If the test piece is not heard conduct audio reset and repeat the test.

If the test piece is still not heard refer to section
- Red Endcap. Ensure the red endcap is securely fitted to the electronics
pack, switch on and wait until the steady threshold tone is heard. Conduct
the test as follows:
- Hold the test piece above the middle of the coil with the rounded end
(containing the metallic target) towards the coil.
NOTE
is heard.
Figure 9: Test Piece Test.
Page 20
5 Fault Finding Procedures.