Panasonic NVRZ1EG, Service Manual

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below.
3.3. SERVICE MODE 3
- After undesirable conditions occured, you can see what kind of
error occured by turning on the Service Mode 3.
3.4. INSERTING THE BUTTON-TYPE BATTERY
Note:
The lithium battery is a critical component (Type No.: CR2025
Manufactured by Panasonic.)
It must never be subjected to excessive heat or discharge.
It must therefore only be fitted in equipment designed specifically
for its use.
Replacement batteries must be of the same type and manufacture.
They must be fitted in the same manner and location as the original
battery, with the correct polarity contacts observed.
Do not attempt to re-charge the old battery or re-use it for any other
purpose.
It should be disposed of in waste products destined for burial
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