F3 COMPACT Service Manual
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62
4
Fault Finding Procedures
4.1
Introduction
a.
A functional test failure can generally be repaired by replacing one or all of the line
replaceable units.
b.
The F3 COMPACT is designed so that line replaceable units can be exchanged between
detectors without the need to calibrate. This means that where spare parts are not available
and more than one detector is faulty, then parts from one detector can be used to make another
serviceable. For example, if detector # 1 has an unserviceable coil and detector # 2 has an
unserviceable battery compartment, then the coil from detector # 2 can replace the coil on
detector # 1 thereby producing a serviceable detector.
4.2
Trouble Shooting Table
a.
The following table identifies a number of faults and provides recommended solutions.
The suggested solutions should be investigated in the order they are listed.
Problem
Recommended Solutions
Detector will not switch
on
●
check batteries are installed correctly
●
replace batteries with fresh batteries
●
replace battery compartment
●
replace main PCB
Detector will not switch
off
●
remove batteries
●
replace Main PCB
After switching on the
detector makes no
sound from speaker
●
check for tone using the earset, turn LEDs on
●
if there is tone through earset – replace the speaker
●
if there is no tone through earset – replace main PCB
Threshold Tone is too
loud
●
ensure area is free from local electromagnetic interference
●
conduct Audio Reset
●
conduct Noise Cancel
●
check coil plug is tight
●
replace coil
●
replace main PCB
On switch on, the “Coil
Fault” tone occurs - “low
pitched double tone
every five seconds”
●
check the coil plug is firmly secured
●
inspect coil cable for damage – if no damage replace main
PCB
●
if damaged replace with new coil
On switch on, the
“Equipment Fault” tone
occurs – “low pitched
slow oscillating tone
(ee-aww, ee-aww)
●
turn off then on
●
replace the switches
●
replace main PCB
After working in hot
conditions, detector
makes a loud noise
●
conduct Audio Reset
●
check coil plug is tight
●
replace coil
●
replace main PCB
