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Therefore, it is recommended to conduct the temperature control by thermistor in order to secure
safely of the system, and design shut-down of power source for the head (V
H
, V
DD
) when anomaly takes
place.
(18) If dusts/foreign articles stuck on the surface of thermal head substrate or printed circuit board. It may
cause stained print, faded print and also damage of heat element, smoking and combustion. In this case,
the head should be cleaned by ethyl-alcohol after power source for head is shut down and please check
if the dusts/foreign articles are completely removed.
Yet, make sure that ethyl-alcohol is dried up before restarting the operation.
(19) Please design power source for head (VH, VDD) to be shutdown when the thermal head surpasses the
maximum rated wattage while STB is On, or the printing medium does not move like paper jam.
Otherwise, heated printing medium bums and sticks to the head and may lead to combustion in the
worst case.