F3 Service Manual
Page
15
Press and immediately release the black Noise Cancel button, as shown in
figure 5.
Figure 5: Noise Cancel
NOTE
The coil should not be moved nor should metallic objects be brought near the coil
during this procedure.
If functioning correctly, Noise Cancel will commence with two single beeps
followed by 45 seconds of sharp double beeps and finishing with four single
beeps.
During the 45 seconds, the detector scans the environment searching for the
source of any electrical interference. Once detected, the F3 will automatically
select a different operating frequency to eliminate or reduce the interference.
If the correct sequence of Noise Cancel beeps is not heard refer to section 5
Fault Finding Procedures.
c. Audio Reset Test. This test confirms the green audio reset button (also the
ground balance button), wiring loom and electronics pack are functioning correctly.
The objective is to ensure the threshold tone returns to its correct volume if altered
from its steady state. The test is conducted as follows:
Hold the coil at least 60cm (24ins) off the ground and away from any metallic
objects.
Induce a threshold tone rise in volume by collapsing the lower shaft into the
middle shaft. Alternatively, slowly move the coil toward a metal object and once
the threshold tone increases in volume, hold the detector stationary.
Once the threshold tone has increased in volume, press and immediately
release the green ground balance button to initiate an audio reset, as shown in
figure 6
To Next Page
Loading...
Need help?
General
