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Appendix 1 Maintenance and Inspection
Periodic Inspection
Check the following items periodically, once every six months. Also, check these points if any
surrounding conditions or any aspect of the environmental changes.
Table A.1 Periodic Inspection Items
Inspection item Inspection Criterion Resolution procedure
Power supply systems
(T2N power supply/MAU
power supply)
Measure the power-supply
voltage at the power-supply
terminals.
Voltages must be within the
stipulated ranges.
Adjust the input voltages to be
within the stipulated ranges.
Check for loose screws at the
power-supply terminals.
There must be no
looseness.
Turn off (remove power from)
the power supply and tighten
down the screws with a
screwdriver.
Check for damage to the
power-supply cables.
There must be no damage. Turn off (remove power from)
the power supply and replace
the damaged cables.
Installation state Is the module firmly locked in
place?
There must be no
looseness or play.
First press the module.
Transmission cable
connections
10BASE5: Are the AUI cables
firmly locked in place?
There must be no
looseness or play.
The 10BASE5 connector
slide latches must be in
their locked positions.
First press the cable firmly into
the connector and then slide
the slide latch to the locked
position.
10BASE2: Are the coaxial
cables firmly locked in place?
There must be no
looseness or play.
The T-connector locks
must be engaged.
First press the T-connector
firmly into position and then
engage the T-connector lock.
10BASE-T: Are the twisted pair
cables firmly locked in place?
There must be no
looseness or play.
The modular connector
locks must be engaged.
First press the twisted pair
cable into modular connector.
Transmission cable wiring
(See section 9.4,
"Network Wiring".)
10BASE5/2/-T: Check for
damage to the cables.
There must be no damage. Stop the system, turn off
(remove power from) the power
supply and replace the
damaged cables.
Are the cables installed near
any power or other cables?
There must be no power or
other similar cables in the
vicinity.
Separate the cables from the
power lines.
Shield the cables.
Ambient conditions Verify that temperature,
humidity, vibration, and dust
levels are all within the
stipulated ranges.
The values must be within
the ranges from the
general specifications for
the module.
Improve the environment so
that all aspects are within the
ranges stipulated in the
specifications.