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4
Fault Finding ProceduresIntroduction
a.
A functional test failure can generally be repaired by replacing one of the sub-
assemblies (Spare Parts Kits) of the detector.
The MF5 is designed so that Spare Parts Kits can be exchanged between detectors
b.
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 faults and provides recommended solutions. The
suggested solutions should be investigated in the order they are listed.
Problem
Detector will not
switch on
Detector will not switch
off
After switching on the
detector makes no sound
from speaker
Constant steady tone from
detector
On switch on, the "Coil
Fault" tone occurs - "low
pitched double tone every
five seconds"
On switch on, the
"Equipment Fault" tone
occurs – "low pitched slow
oscillating tone (ee-aww,
ee-aww)
Recommended Solutions
•
Check batteries are installed correctly
•
Replace batteries with fresh batteries
•
Replace battery compartment
•
Replace main PCB
•
Remove batteries
•
Replace Main PCB
•
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
•
Ensure area is free from local electromagnetic
interference
•
Conduct Noise Cancel
•
Check coil plug is tight
•
Replace coil
•
Replace main PCB
•
Check the coil connector is firmly secured
•
Inspect coil cable for damage – if no damage replace
main PCB
•
If damaged replace with new coil
•
Turn off then conduct factory reset
•
Replace the switch
•
Replace main PCB
85
MF5 Service Manual
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