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20.2 Before Maintenance on an XBU


20.2 Before Maintenance on an XBU
When replacing an XBU, perform one of the maintenance procedures listed below.


Caution - Before you handle any unit, be sure to wear a wrist strap to ground any static electricity. If you perform this procedure without a wrist strap, individual components or the overall system may be seriously damaged. For details, see "1.5 Precautions on Static Electricity."