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Appendix B: Maintenance and Service 240
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Plug-In Extensions
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CAUTION
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Always turn the HP-41C off before inserting or removing any plug-in extensions
or accessories. Failure to do so could damage both the calculator and the
accessory.
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All plug-in extensions should be handled with care.
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1.
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Keep the contact area free of obstructions. Should the contacts become
dirty, carefully brush or blow the dirt out of the contact area. Do not
use any liquid to clean the contacts or extension.
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2.
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Store the extensions in a clean dry place. Do not place plug-in extensions
in a pocket unless they are protected in their case. Static electricity
could damage the extension.
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3.
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Always turn te HP-41C off before inserting or removing any plug-in
extension. Failure to do so could damage both the calculator and the
extension.
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Batteries
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Because your HP-41C uses so little power, the batteries should normally
last about 9 to 12 months, depending on how much you use the calculator.
Using alkaline batteries, near the end of the battery lifetime, the
BAT annunciator in the display
will turn on, reminding you that about 10 to 30 days of operating time
remain.
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New size N batteries, preferable alkaline, should be installed (refer to
Replacing the Batteries, below). Use only the following batteries:
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Eveready E90
Mallory MN9100
National AM5(s)
Panasonic AM5(s)
UCAR E90
VARTA 7245
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These batteries, like those originally supplied with your HP-41C, are
not rechargeable.
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WARNING
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Do not attempt to recharge the batteries. Do not store batteries
near a source of high heat or dispose of them in fire. Doing so
may cause them to leak or explode.
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An AC adapter is available as an optional accessory for your HP-41C.
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