Printronix SL_T5R Energy Star - Manual (Page 228)

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Chapter 3 DIAGNOSTICS
Ptr Media Dist
Displays the cumulative number of inches the printer has moved media.
This value is set to zero at the factory.
Head Print Dist
Displays the length of media actually printed since the last Reset Head Data
operation. This value is set to zero at the factory.
Head On Time
Displays the time that power has been applied to the printhead since the last
Reset Head Data operation. This value is set to zero at the factory.
Reset Head Data
Resets all printhead statistics values (Head Prt Dist and Head On Time) to
zero.
Head Type
Displays the printhead type installed in dots per inch (203 dpi or 300 dpi).