Cleaning And Maintenance - Huawei U3900 User Manual

Do not drop the device or battery. If the device or battery is

dropped, especially on a hard surface, and may be damaged.
If the device standby time shortens significantly, replace the

battery.

Cleaning and maintenance

Keep the device and accessories dry. Do not attempt to dry it

with an external heat source, such as a microwave oven or hair
dryer.
Do not expose your device or accessories to extreme heat or

cold. These environments may interfere with proper function
and may lead to fire or explosion.
Avoid collision, which may lead to device malfunctions,

overheating, fire, or explosion.
Before you clean or maintain the device, stop using it, stop all

applications, and disconnect all cables connected to it.
Do not use any chemical detergent, powder, or other chemical

agents (such as alcohol and benzene) to clean the device or
accessories. These substances may cause damage to parts or
present a fire hazard. Use a clean, soft, and dry cloth to clean
the device and accessories.
Do not place magnetic stripe cards, such as credit cards and

phone cards, near the device for extended periods of time.
Otherwise the magnetic stripe cards may be damaged.
Do not dismantle or remanufacture the device and its

accessories. This voids the warranty and releases the
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