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6. TROUBLESHOOTING
6-11
6
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.
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.