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If there is no paper jam and the print head is not overheated,
turn off the printer and wait for half a minute then turn it back on.
If the problem still remains, contact a qualified service person.
Nothing can be printed with ERROR LED OFF – Try to
run self test according to previous chapter to check if the printer
itself works properly. If the self test passes, check the following:
a. Check the signal of the wireless interface at both the
printer and computer.
b. Check the printer data communication settings against the
computer. The printer settings can be found easily on the
self test print out.
If the problem remains or the self test fails, contact your
dealer or a qualified service person.
Poor printing quality – Contaminants like paper scraps and
dusts on the thermal print head can lower the print quality
drastically. Clean the print head as described in previous section.
Printer trembles when printing – Since PP7700 prints at
180 mm / sec that is extremely high speed, the printer may
tremble due to frequent engagement of the brake and acceleration
of the motor. Such situation in turn can be consequences of very
complicated printer operation command or heavily dense printing
(like in inverse printing) in print content or irregular / insufficient
data flow received from the host. When this happens, the print
speed will be dragged down drastically since the motor has to be
stopped frequently. Avoiding such draw backs can free the printer
from trembling and degraded performance. As a common practice,
increasing the communication baud rate could be a smart decision.