Hitachi 65 Instruction Manual page 35

(5) INSTALLATION ENVIRONMENT
<Precautions>
・When you install a commercially extension slot, the specifications for the required
environment for both the commercially available device and this equipment must be met.
(See "1.6.1 Environment".)
・When you install a device in a general purpose 5-in bay or extension slot, make sure the
power consumption does not exceed the maximum current rating. (See "5.1(9) Maximum
current specifications".)
・In order to use this equipment without failure for a long period of time, you must use it
with proper care and in the proper environment. Do not use the equipment in the
locations described below. If you do, the life span of the equipment may be reduced and
failure of the equipment may result.
⚫ In a place subject to exposure to direct sunlight......Too close to a window
⚫ In a place subject to rapid temperature or humidity change......Too close to an air conditioner
⚫ In a place close to device that generates electrical noise......Too close to electric motors and
⚫ In a place close to device that generates a strong magnetic field......Too close to magnets or the like
⚫ In an environment full of dust
⚫ In a place subject to vibration
⚫ In an environment with corrosive gasses present
⚫ In a place with vibration caused by loud sounds......Too close to device that generates a loud
・The following are precautions for the left, right, top, and bottom sides of the equipment:
・Do not attach heating devices.
・For ease of maintenance work, make sure that the Equipment can be moved easily;
if fixed, ensure that the Equipment can be removed easily.
・It is reported that zinc whiskers can cause a problem with the device. Do not use electro-
galvanized material near or at the place where the equipment is installed.
(A quote from the Technical Report of JEITA(*) ITR-1001 "Guideline of Facilities and
Equipment for Information Systems")
Location of whiskers:
Phenomenon:
the floor for some reason, go inside the device, and short-circuit a PCB or its
pins. The root cause is difficult and time-consuming to find because the
symptom differs depending on the location of the short circuit, and often, it is
mistaken for a temporary issue.
(*) JEITA : Japan Electronics and Information Technology Industries Association
Whiskers are created by electrogalvanized equipment such as
floor panels, stringers, posts, aseismatic flat steel, and the like.
Hair-like zinc crystals (conductive whiskers) float into the air from
C-4
generators
buzzer or alarm