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Maintaining the System C-5
If the system has been exposed to abnormally cold temperatures, allow a two-
hour warm-up period to bring it up to normal operating temperature before
turning it on. Failure to do so may cause damage to internal components, particu-
larly the hard-disk drive.
If intermittent system failures are noticed, try reseating any socketed chips,
which might have become loose due to temperature fluctuations.
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High-humidity conditions can cause moisture migration and penetration into the sys-
tem. This moisture can cause corrosion of internal components and degradation of
properties such as electrical resistance, thermal conductivity, physical strength, and
size. Extreme moisture buildup inside the system can result in electrical shorts, which
can cause serious damage to the system.
Each Dell system is rated to operate at 8 to 80 percent relative humidity, with a
humidity gradation of 10 percent per hour. In storage, a Dell system can withstand
from 5 to 95 percent relative humidity.
Buildings in which climate is controlled by air-conditioning in the warmer months and
by heat during the colder months usually maintain an acceptable level of humidity for
system equipment. However, if a system is located in an unusually humid location, a
dehumidifier can be used to maintain the humidity within an acceptable range.
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Operating a system at high altitude (low pressure) reduces the efficiency of forced
and convection cooling and can result in electrical problems related to arcing and
corona effects. This condition can also cause sealed components with internal pres-
sure, such as electrolytic capacitors, to fail or perform at reduced efficiency.
Each Dell system is rated to operate at altitudes from 16 to 3048 meters (m) (50 to
10,000 feet [ft]) and can be stored at altitudes of 16 to 10,600 m (50 to 35,000 ft).
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A clean operating environment can greatly reduce the negative effects of dust and
other particles, which act as insulators and interfere with the operation of a systems
mechanical components. Also, in addition to regular cleaning, you should follow these
guidelines to deter contamination of the system equipment:
Do not permit smoking anywhere near the system.
Do not permit food or drink near the system.
Use dust covers when the system is not in use.
Keep all diskettes in a closed diskette box when not in use.
Close windows and outside doors to keep out airborne particles.
3502Ebk0.book Page 5 Friday, November 13, 1998 10:00 AM