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Section 5: MAINTENANCE
This section covers maintenance items which should be verified periodically.
5.1 MAINTENANCE ITEMS
The Model 9000 DME system was designed to reduce routine maintenance to a minimum. Items which
require periodic function check or maintenance are listed below:
• System Status Indicators & Alarm Outputs
This item provides a verification of the system status indicators (see Section 1.1 and Section 1.2)
and a function check of the alarm output contacts (see Section 1.2).
o ON LINE:
This alarm output can be tested by powering off one of the M9000 modules. Once the
alarm output activates, return power to the module to clear the alarm.
o TRIGGER:
This alarm output can be tested by using the Trigger Now feature in the user interface (see
Section 3.3)
o CLOCK SYNC:
This alarm output can be tested by disconnecting the IRIG input cable from the system
(see Figure 1-3).
o COMMUNICATION:
This alarm output can be tested by disconnecting a network cable from one of the M9000
modules (see Figure 1-3).
o POWER:
This alarm output can be tested by powering off one of the M9000 modules. Once the
alarm output activates, return power to the module to clear the alarm.
o DISK:
This alarm output can not be field tested.
o TEMPERATURE:
This alarm output can not be field tested.
• Analog Inputs
This item provides a verification of the analog inputs. This is done using the Scope feature of the
user interface (see Section 2.3.7).
o Calibration:
The tools used for this item are listed below:
▪ Internal Calibration
See the Internal Calibration section for details.
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