Omron NT21 - SETUP MANUAL 10-2001 Setup Manual page 197

Inspection and Cleaning
Point
Inspected
Power supply Fluctuation in power supply terminal
voltage voltage
Ambient Ambient temperature (temperature in the
e environmental o e ta operation panel)
conditions
Ambient humidity (humidity in the
operation panel)
Presence/absence of dust
Mounting g Looseness of mounting brackets, etc.
conditions di i
Connector connections of connecting
cable
Looseness of screws in external wiring
Conditions of external connecting cables Faults such as incipient disconnection Visual inspection
Components Brightness of the backlight
with limited
lives
Reference: Desire on replacing the NT21
186
Inspection Details
Note 1. Do not disassemble for repairs or modification. Otherwise the product may
malfunction.
2. The disposal of the Unit and spent batteries may be regulated by national or
local authorities. Dispose of them in accordance with the laws and regula-
tions of the relevant country and local authority.
When replacing the NT21 after discovering a fault during inspections, note the
following points:
S Be sure to switch the power OFF before starting replacement.
S After replacement, check that the new NT21 is not subject to the same error.
S If a faulty Unit is returned for repairs, write as detailed a description of the fault
as possible and send this description together with the Unit to the OMRON ad-
dress indicated on the back cover of this book.
Criterion
Permissible voltage fluctuation range
(24 VDC −15% to +15%)
0 to 50_C
35% to 85% RH
Dust must not be settled
To be no looseness
To be fully inserted and locked, with
no looseness
To be no looseness
Must be sufficiently bright.
Backlight life:
At normal ambient temperature and
humidity, the backlight brightness will
drop to about 50% of its original
brightness after 50,000 hours of use.
Section 7-4
Inspection
Instrument
Tester
Thermometer
Hygrometer
Visual inspection
Philips screwdriver
Philips screwdriver
Philips screwdriver
Visual inspection