John Lewis JLBIGH753 - Manual (Page 10)

10
Fault Finding Fault Finding Fault Finding Fault Finding Fault Finding
Pr Pr Pr Pr Preliminar eliminar eliminar eliminar eliminary Electrical y Electrical y Electrical y Electrical y Electrical
Systems Check Systems Check Systems Check Systems Check Systems Check
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Blue
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Green Brown
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A. A. A. A. A. EAR EAR EAR EAR EARTH CONTINUITY CHECK TH CONTINUITY CHECK TH CONTINUITY CHECK TH CONTINUITY CHECK TH CONTINUITY CHECK
Appliance must be electrically disconnected -
meter set on W (Ohms) x 1 scale and adjust
zero if necessary.
a) Test leads from any appliance earth point to
earth pin on plug. Resistance should be less than
0.1 W (Ohm), check all earth wires for continuity
and all contacts clean and tight.
B. B. B. B. B. INSULA INSULA INSULA INSULA INSULATION CHECK TION CHECK TION CHECK TION CHECK TION CHECK
Appliance electrically disconnected, all switches
ON.
a) meter set on W (Ohms) x 1 scale.
Te s t
leads from L to N in appliance terminal block. If
meter reads «0» then there is a short circuit.
b) meter set on W (Ohm) x 100 scale.
Repeat test with leads from L to E. If meter reads
less than
¥ (infinity) there is a fault.
NOTE - Should it be found that the fuse has
failed but no fault is indicated - a detailed
continuity check (i.e. by disconnecting and
checking each component) is required to trace
the faulty component.
It is possible that a fault could occur as a result
of local burning/arcing but no fault could be
found under test. However a detailed visual
inspection should reveal evidence of burning
around the fault.
Electricity supply
should now be
satisfactory.
START START START START START
Isolate appliance
and carry out:
A:
A: A: A: A: Earth Continuity
check.
Has inlet fuse blown?
Carry out:
B:
B: B: B: B: Insulation
check.
Inlet wiring
faulty.
Rectify any
fault.
Isolate appliance and
carry out:
B:
B: B: B: B: Insulation check.
Rectify any fault
including replacing
fuses as necessary.
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