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9-3SectionBoard Replacement
131
9-3-2 Inspection
To keep the Serial Communications Board in optimum condition, regular inspec-
tions must be performed. Normally, inspect the devices once every six months or
every year. Inspect the devices at more regular intervals when they are being
used in environments subject to high temperatures, high humidity, or high dust
levels.
Prepare the following materials before performing any inspections.
Materials Required Daily
For daily inspection, a Phillips screwdriver, flat-blade screwdriver, tester (or digi-
tal voltmeter), industrial strength alcohol, and all-cotton cloth are required.
Materials Required Occasionally
For some inspections, a synchroscope, a pen oscilloscope, a temperature
gauge, and a hygrometer will be required.
Inspect the following items to check whether the Serial Communications Board
is operating within the specified criterion. If the Serial Communications Board is
not within the criterion, improve the ambient operating environment and readjust
the device.
Item Details Criterion Inspection
materials
Operating
environment
Check the ambient temperature
and the temperature inside the
control panel.
0 to 55°C Temperature
gauge
Check the ambient humidify and
the humidity inside the control
panel.
10% to 90% RH
(no
condensation or
icing)
Hygrometer
Check for accumulated dust. No dust Visual
inspection
Installation
Check that the Serial
Communications Board is
mounted securely.
Board must be
mounted
securely.
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Check for loose screws on the
communications cables.
Screws must be
securely
tightened.
Phillips
screwdriver
Check for damaged
communications cables.
Cables should
be fully intact.
Visual
inspection
Materials for Inspection
Inspection Items