Rev. A
Operation Principles 2-7
EU-T532/T542 Technical Manual
Confidential
Data input and printing
The
thermal head
consists of the head heating elements, the head driver, which controls or
drives the head heating elements, and the
thermistor
,
which detects the temperature of the
thermal head
. The serial print data input from Data In (DI1) is synchronized to the CLOCK
(CLK) input, and temporarily placed in the SHIFT REGISTER. Using the LATCH (/LAT) signal
timing, these data are then stored in the LATCH REGISTER. Activated by the STROBE signals
(/STR1, /STR2), the stored print data is used to control the gate ON condition for the head
heating element drive pulse.
This printer is equipped with two strobes, and can print using a maximum of four divisions.
The drive pulse width is controlled by the control circuit board module.
Figure 2-8 Thermal head block diagram
Table 2-3 Strobe and Dot Number
STROBE No.
Dot No.
Dots/STROBE
1
1 to 320
320
2
321 to 640
320
*The STB terminals are pulled down in the control IC.
64 output each
