F3 Field Service Manual – Level 1 Maintenance
Page 51
4.
FAULTFINDING PROCEDURES
Faultfinding is carried out using the substitution method, whereby known
good components are substituted to confirm a faulty component. So a complete
and serviceable F3, or a range of parts should always be on hand to conduct these
faultfinding procedures. When a faulty component is identified, replace it using the
Disassembly and Reassembly procedures at Section 3.
4.1
Switch On Test Faultfinding
•
If the detector makes no noise at all, with known good batteries, replace the
battery pack.
•
If there is still no sound, plug an earset into the detector, if there is sound
from the earset, the problem may be either the loudspeaker (part of speaker
pod assembly), main wiring loom or electronics pack. Replace these one at a
time until the faulty component is identified.
•
If there is no sound from the earset or from the detector, the problem may be
either the on/off switch actuator, main wiring loom or the electronics pack.
Replace these one at a time until the faulty component is identified.
4.2
Noise Cancel Faultfinding
•
If nothing happens when the noise cancel button is pressed or if the wrong
tones are heard, the problem may be either the main wiring loom (which
contains the noise cancel button) or the electronics pack.
•
Replace these one at a time until the faulty component is identified.
4.3
Audio Reset Faultfinding
•
If the detector does not audio reset correctly, the problem may be either the
audio reset/ground balance button (part of speaker pod assembly), main
wiring loom or electronics pack.
•
Replace these one at a time until the faulty component is identified.
Note:
The audio reset/ground balance button and main wiring loom can be checked
by ground balancing the detector, if the detector ground balances correctly,
the audio reset/ground balance button and main wiring loom are OK.
4.4
Ground Balance Faultfinding
•
If the detector does not ground balance correctly, the problem may be either
the audio reset/ground balance button (part of speaker pod assembly), main
wiring loom, coil or electronics pack.
•
Replace these one at a time until the faulty component is identified.
Note:
The audio reset/ground balance button and main wiring loom can be checked
by conducting an audio reset procedure, if the detector audio resets correctly,
the audio reset/ground balance button and main wiring loom are OK.)
4.5
Test Piece Faultfinding
Note:
The detector may not detect the test piece until 30 seconds after the detector
has been turned on, this is normal.
•
If the detector does not detect the test piece correctly, the problem may be
either the coil or electronics pack.
•
Replace these one at a time until the faulty component is identified.
