单项选择题

When is it advisable to dump the waste toner from a technicians service vacuum？（）

A.When it is full.
B.It is not recommended.
C.Before performing preventative maintenance.
D.After each call.

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Which of the following would be the BEST process for the technician to follow when beginning to diagnose a unit at a customers site？（）

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D.Gather information from the primary user， and then evaluate the printers condition.