7-4SectionInspection and Cleaning
185
• When the message “The voltage is lowered.” is displayed when the NT21 is
turned ON.
• When The voltage is lowered is displayed in the Battery check in the battery
check menu of the Maintenance mode.
Battery Replacement Procedure
Use
the following procedure to replace
the battery
. T
o preserve the contents of
the memory, the battery must be replaced within 5 minutes.
1, 2, 3... 1. Keep the NT21’s power ON for at least 5 minutes and then turn it OFF.
It is also possible to replace the battery with the power ON.
Reference: Unless
the power is kept ON for at least 5 minutes, the memory contents cannot
be retained for more than 5 minutes without a battery.
2. Remove
the battery from the battery cover
, grip the cable, and pull the
con
-
nector straight out.
3. Refer
to
Installing the Battery
above (page
184) for details on installing the
new battery.
7-4 Inspection and Cleaning
Clean
and inspect the NT21 regularly to ensure that it is always used in its opti
-
mum condition.
If
the display is dirty the screen is dif
ficult to see. Clean the screen from time to
time as follows.
• In
daily cleaning, wipe the display with a soft dry cloth. If the soiling is particular
-
ly heavy, attempting to remove it by wiping with a dry cloth may damage the
front sheet of the Unit. In this case, wipe with a damp cloth.
• If
the soiling cannot be removed with a dry cloth, wet the cloth with diluted neu
-
tral detergent (2%), wring it out well and wipe the display with it.
• If
rubber or
vinyl products, tape, etc., are left stuck to the display for long peri
-
ods
they will cause staining. If such items are stuck to the display
, remove them
during cleaning.
Note Never use volatile solvents such as benzene or thinners, or chemical dusters.
Otherwise the product may malfunction.
In
normal environments, inspect the NT21 at intervals of between 6 months and
a
year
. In environments that are extremely hot and humid, or very dusty environ
-
ments, shorten the inspection interval.
Items Required for the Inspection
Prepare the following items before starting the inspection.
• Screwdrivers (Philips, flat head)
• Tester (or digital voltmeter)
• Industrial alcohol
• 100% cotton cloth
• Hygrometer (required in some cases)
• Thermometer (required in some cases)
• Synchroscope (required in some cases)
• Pen-writing oscilloscope (required in some cases)
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
NT21, for example by re-tighten
-
ing screws.
Cleaning Method
Inspection Method
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