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Inspection and Cleaning Section 7-4
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. Insert a flat blade screwdriver at the top of the battery cover located at the
left of the rear face of the NT631/NT631C and pull it toward you.
3. Remove the battery that is secured under the battery cover, grip the cable,
and pull the connector straight out.
4. Insert the connector of the new battery into the connector on the NT631/
NT631C and fit the battery under the battery cover.
When inserting the battery connector, make sure that the projection on it
faces to the left, and press it fully home while keeping it straight.
The connector of the new battery must be connected within 5 minutes after
disconnecting the old battery’s connector. However, the battery can be re-
placed while the NT631/NT631C power is on, and in this case there is no
time restriction.
5. Close the battery cover, making sure that the cable is not trapped.
7-4 Inspection and Cleaning
Clean and inspect the NT631/NT631C regularly to ensure that it is always
used in its optimum condition.
Cleaning Method If the display is dirty the screen is difficult 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 par-
ticularly 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
neutral 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
periods 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.