Yamaha QX5 Owner's Manual page 6

PRECAUTIONS
on
LOCATION
HANDLING
POWER CABLE
CLEANING
ELECTRICAL STORMS
(LIGHTNING)
ELECTROMAGNETIC
FIELDS
Avoid placing the QX5 in direct sunlight or close to a source of heat. Also, avoid
locations in which the device is likely to be subjected to vibration, excessive dust,
cold or moisture.
Avoid applying excessive force to the switches, dropping or rough handling. While
the circuitry is of reliable integrated circuit design, the QX5 should be treated with
care.
Always grip the plug directly when removing it from an AC receptacle. Removing
the plug from the AC receptacle by pulling the cable can result in damage to the
cable, and possibly a short circuit. It is also a good idea to disconnect the QX5 from
the AC receptacle if you don't plan to use it for an extended period of time. ~
Use only a mild detergent on a cloth, and dry with a soft cloth. Never use solvents
(such as benzine or thinner) since they can melt or discolor the finish.
Computer circuitry, including that in the QX5, is sensitive to voltage spikes. For
this reason, the QX5 should be turned off and unplugged from the AC receptacle
in the event of an electrical storm. This precaution will avoid the chance that a
high voltage spike caused by lightning will damage the device.
Computer circuitry is also sensitive to electromagnetic radiation. Television sets,
radio receivers, transmitters and transceivers, and wireless microphone or intercom
systems are all potential sources of such radiation. The QX5 should not be placed
too close to such devices.