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D400 Substation Data Manager User's Manual  
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Servicing the D400 
The D400 does not require any scheduled maintenance. However, you may need to 
replace the following parts occasionally: 
•  System battery 
•  CompactFlash card 
A periodic inspection is also suggested to ensure that: 
•  Unit has sustained no accidental physical damage 
•  Airflow is not obstructed 
•  Connectors and cables are intact and firmly attached 
•  Battery condition is good 
Only trained personnel should perform maintenance on the D400.