Xerox B310 Service Manual page 212

Theory Of Operation
POR Sequence
As the printer is turned on, the engine code goes through a series of tests to verify hardware integrity.
If a hardware failure is detected, then it is reported to the printer. If the POR sequence cannot be
completed successfully, then the printer may post an error message. The message states that service
may be needed.
212 Xerox B310 Printer
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Service Manual