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Inspection and Cleaning Section 7-4
Points Inspected
Inspect the following points to determine if there is any divergence from the
stated criteria. If there is, either improve the surrounding environment so that
the values fall within the stated range, or adjust the NT31/NT31C, for example
by re-tightening screws.
Note 1. Do not disassemble for repairs or modification.
2. The disposal of the PT (including batteries to be disposed and backlight)
may be regulated by national or local authorities. Dispose of them in accor-
dance with the laws and regulations of the relevant country and local au-
thority.
Reference: Desire on replacing the NT31/NT31C
When replacing the NT31/NT31C after discovering a fault during inspections,
note the following points:
• Be sure to switch the power OFF before starting replacement.
• After replacement, check that the new NT31/NT31C is not subject to the
same error.
• If a faulty PT is returned for repairs, write as detailed a description of the
fault as possible and send this description together with the PT to the
OMRON address indicated on the back cover of this book.
Point
Inspected
Inspection Details Criterion Inspection
Instrument
Power supply
voltage
Fluctuation in power supply terminal volt-
age
Permissible voltage fluctuation range
20.4 to 26.4 VDC
(24 VDC –15%, +10%)
Te st e r
Ambient envi-
ronmental con-
ditions
Ambient temperature (temperature in the
operation panel)
0 to 50°C Thermometer
Ambient humidity (humidity in the opera-
tion panel)
35% to 85% RH Hygrometer
Presence/absence of dust Dust must not be settled Visual inspection
Mounting condi-
tions
Looseness of mounting brackets, etc. To be no looseness Phillips screwdriver
Connector connections of connecting
cable
To be fully inserted and locked, with no
looseness
Phillips screwdriver
Looseness of screws in external wiring To be no looseness Phillips screwdriver
Conditions of external connecting cables Faults such as incipient disconnection Visual inspection
Components
with limited lives
Brightness of the backlight Must be sufficiently bright.
Backlight life:
Brightness is halved after about
50,000 hours of use at high brightness.
Visual inspection
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