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6. TROUBLESHOOTING
6-8
Table 6-5 Periodic Inspection List
Area of
Inspection
Inspection Items Methods Criteria
Surrounding
environment
1) Check ambient temperature,
humidity, vibration, ambience
(for dust, dirt, gas, oil mist,
water drops, etc.)
2) Check for tools, foreign matter
and dangerous articles in the
periphery.
1) Measure visually
or with
instruments.
•
Thermometer
•
Hygrometer
•
Recorder
2) Visual check.
1) Standard
specification
values must
be satisfied.
2) Must not be
left
unremoved.
Overall unit
Check for unusual vibration and
unusual noise.
Visual and auditory
checks.
No fault.
General
1) Check for loose screws and
bolts.
2) Check parts and members for
deformation, crack, damage,
and discoloration caused by
overheat or deterioration.
3) Check for contamination and
sticking dust and dirt.
1) Retighten.
2), 3) Visual check.
1), 2), 3)
No fault.
Conductors,
cables
1) Check conductors for
discoloration and distortion
caused by overheat.
2) Check cable sheaths for
breakage and discoloration.
1), 2) Visual check. 1), 2) No fault.
Terminal
block
Check for damage. Visual check. No fault.
Smoothing
capacitor
1) Check for liquid leakage,
discoloration, crack and
casing expansion.
2) Check for projected safety
valve.
3) Measure capacitance.
1), 2) Visual check.
3) Use capacitance
meter for
measurement.
1), 2) No fault.
3) 85% or more
of rated
capacitance.
Main circuit
Resistor
Check for foul odor and
insulation crack due to overheat.
Olfactory, visual
checks.
No fault.
Control circuit
Control
printed
circuits,
connectors
1) Check for loose screws, bolts
and connectors.
2) Check for unusual odor and
discoloration.
3) Check for crack, damage,
deformation, and rust.
4) Check capacitor for liquid
leakage and traces of
deformation.
1) Retighten.
2) Olfactory, visual
checks.
3), 4) Visual check.
1), 2), 3), 4)
No fault.
Cooling fan
1) Check for sticking foreign
matter.
2) Check for loose connection.
1) Hand turn.
2) Visual check
1) Smooth turn.
2) No fault.
Cooling system
Ventilation
path
Check for clogged heat sink,
suction/exhaust ports, and
sticking foreign matter.
Visual check. No fault.