Ricoh Aficio 250 Reference Manual page 9

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Ground the machine and the lightning protection circuit in accordance with
regulations. Do not ground to gas or water pipes, or to a telephone ground
plug. Proper grounding is to the ground terminal of the power outlet. Be sure
that the ground terminal of the power outlet is properly grounded.
The lightning protection circuit for the machine requires the machine to be
properly grounded. If proper grounding is provided, about 90% of lightning
damage can be prevented. For safety, be sure to connect the machine to a
three-prug grounded outlet.
Avoid raising the room temperature abruptly when it is below 57°F(14°C), or
condensation may form inside the machine.
1. Raise the room temperature to 68°F(20°C) at less than 18°F(10°C) per
hour.
2. Wait for 30 to 60 minutes.
3. Turn the power on.
4. Do not use the machine near a humidifier.
With proper grounding, about 90% of lightning damage can be prevented.
However, if possible, during severe electric storms turn the power switch off
and disconnect the power cord and telephone line cord.
1. Since some parts of the machine are supplied with high voltage, make
sure that you do not attempt any repairs or attempt to access any part of
the machine except those described in this manual.
2. Do not make modifications or replacements other than those mentioned in
this manual.
3. When not using the machine for a long period, disconnect the power cord.
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