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6 INSPECTION AND MAINTENANCE
Daily Inspection(continued)
Item Inspection item Inspection Criterion Action
Input LED
Check that the LED is
ON/OFF.
The LED must be ON at input signal ON.
The LED must be OFF at input signal OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
4
Module indication LED
I/O module
Output LED
Check that the LED is
ON/OFF.
The LED must be ON at output signal ON.
The LED must be OFF at output signal OFF.
(Abnormal if the LED does not turn ON or
turn OFF as indicated above.)
Refer to
"I/O Module Type
Building Block
User's Manual".
Check for vibration, howl
and noise.
No vibration, howl and noise.
(A service life time of the cooling fan unit :
when the number of the revolution lower than
the 20% of the initial time.)
Replace it with a
new one if a
service life time of
the cooling fan
unit is exceeded,
5
Cooling fan unit
(Q173CPU/Q172CPU
only)
Check that the connectors
for cooling fan unit is not
dislocated and the hooks
of cooling fan unit is
engaged correctly.
The connectors for cooling fan unit and hooks
of cooling fan unit must be engaged and
installed correctly.
Engage the
connectors and
hooks correctly.