EC-PM-80320 Service Manual
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4.1.2 The structure of thermal head
Figure 4-3 shows electric theory of EC-PM-80320 thermal head.
Table 4-1 explains the relationship between DST module and the start-up fever component.
Thermal head contains several fever components a head-driver which is used to control and drive
the fever components. Along with the CLK signal, Serial data is transmitted from DATAIN to
shift-register synchronously, and to be saved in the latch-register with the LATCH signal cycle
time. Later on, print start-up signal (DST1, 2) will heat the corresponding fever component
according to the data latched in the latch-register. EC-PM-80320 thermal head prints 128 dots per
section according to the print content.
Because print separately can cut down the peak value of electricity caused by reducing the
average of print speed, which is useful to high-frequency print. When the print section is lower
than 128 dots, excrescent voice evokes or disruption can be produced and the print quality will
also be dropped. So please check the dots in advance.
When the dots of high-frequency are lower than 176, the phenomenon of paper glued occurs for
the reason of the surrounding temperature, drive voltage and paper used, which is also need to
check the dots in advance.
DST NO Numbers of fever component Dots/DST
DST1 1 to 384 384
DST2 385 to 640 256
Figure 4-3 Electric structure features of thermal head
Table 4-1 DST module and fever component
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