单项选择题

A polygon mirror is part of which of the following assemblies？（）

A.Laser unit
B.Developer unit
C.Charge assembly
D.Fuser assembly

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单项选择题

Acustomerhasinstalledanewcomputerontheirnetwork.Theycanprinttotheprinterbuttheoptionforduplexprintingisnotavailable.Allothercomputershavetheoption.Whichofthefollowingisthecauseoftheproblem？（）

A.The new computer is printing to the wrong IP address.
B.The new computer is using the wrong protocol.
C.The driver port is not setup correctly.
D.The option has not been selected on the driver.

单项选择题

Whenisitadvisabletodumpthewastetonerfromatechniciansservicevacuum？（）

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