Hitachi LQZ700, Руководство пользователя

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5 MAINTENANCE
5-2
5.1 Maintenance and Inspection
5.1.1 Periodic check
To keep the module running in optimal condition, it requires checks. Make checks daily or
periodically (twice a year or more often).
Table 5-1 Maintenance and Inspection Items
Item Point to check
Module appearance Check the module case for cracks, flaws and other defects. Such
defects can be a sign of breakage in the internal circuitry, causing the
system to malfunction.
LED Check to see if the module ERR LED has not glowed.
Looseness of mounting
screws Check the module and communications cable mounting screws for
tightness. Give additional tightening to screws found loose. Loose
screws could cause the system to malfunction and lead to burnouts
after heating.
Cable sheath condition Check cable coverings for defects. A cable covering out of position
could cause the system to malfunction, incur electrical shock hazards,
or develop short circuits, resulting in burnouts.
Dust sticking condition Check to see if the module has not caught dust. If dust is noticed,
remove it with a vacuum cleaner or other apparatus. Dust could
cause short circuits in its internal circuitry, resulting in burnouts.
Module replacement Replacing the module without switching it off could cause damage to
its hardware and software. Before replacing the module, switch it
off first.
Connector condition Connectors might have their characteristics degraded to cause failures
if their contacts catch dust or foreign matter. Cover connectors out
of use with the protective cap supplied.
DANGER
z Static electricity may damage the module. Before starting the work,
discharge all electrostatic charge from your body.
z
Before replacing the module, switch it off to avoid electrical shock hazards and
also to prevent it from being damaged or malfunctioning.