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– 16 –
PRINCIPLES OF OPERATION
Fig. 2-5 Block Diagram of Drive IC
2-2-3. Head current control
Although the thermal printhead has four different STROBE lines, in fact it uses only three strobe signals to control its 576
elements. Specifically, each signal drives 192 of these elements. The signal/element arrangement is shown below.
Thermal Printhead Elements Strobe Signal
STROBE1 1 – 192 STB1
STROBE2 193 – 256
STB2
STROBE3 257 – 384
STROBE4 385 – 576 STB3
DO1
GND
H
V
DD
SO
DO2
V
DD
GND
L
STB
BEO
D
Q
L
C
Q
D
D
Q
L
C
Q
D
DO3
D
Q
L
C
Q
D
V
DD
CHECKER
LAT
SI
CLK
CTL
DO62 DO63
D
Q
L
C
Q
D
D
Q
L
C
Q
D
DO64
D
Q
L
C
Q
D
BUFFER
LATCH
SHIFT
REGISTER