Reliability - Fujitsu M2361A Customer Engineering Manual

1.2.5 Reliability
(i)
Mean time between failure (MTBF)
The MTBF is defined as follows:
MTBF
= __
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Number of Equipment Failures
The MTBF shall exceed 20,000 hours (design value). Estimated operating
hours should not include any maintenance time. Equipment failure means
any stoppage or substandard performance of the equipment because of
equipment malfunction, excluding that caused by operator error, cable
failure, or other failure not due to the equipment. To establish a
meaningful MTBF, operating hours must be greater than 6,000 hours and
shall include field performance data from all field sites.
For the purpose of this specification, equipment failures are defined as
those failures necessitating repair or replacement on an unscheduled
basis.
(2) Mean time to repair (HTTR)
The mean time to repair shall not exceed 0.5 hour. It is defined as the
time for an adequately trained and competent service technician to
diagnose and correct a malfunction.
(3) Preventive maintenance time
The air filter should be cleaned or replaced at one year intervals, or as
required.
(4) Component Life
The M2361A provides a useful life of five (5) years before factory
overhaul or replacement is required.
(5) Power Less
Data integrity is assured in the event of a power loss (data is not
assured during write operation).
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