POSIFLEX Business Machines PP5600 SERIES - Manual (Page 17)

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D.
SELF TEST
Press and hold down
the feed button while
turning on the power. The
printer will then perform a
self test and print out some
major settings detected. You
may turn off the power and
turn it on again to resume
normal use of the printer at
this stage. You may also
press the feed button at this
moment to have the printer
further print out some basic
font used and a special
pattern to have the self test
proceedings completed. A
sample slip of whole self
test result is printed here for
reference. Please note that
both serial and parallel
interfaces are indicated.
That means the printer is
working on an auto-sensing
and auto-select algorithm.
The pattern of long vertical
lines at bottom of the slip is
an indicator for adjustment
on so-called bi-directional
printing offset.