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5 PRINTHEAD
MT2480 has a thickfilm thermal printhead. Scanning Line Time (SLT) is the time to print one complete line using all strobes
available . The relation between the printhead supply voltage and "On Time" (Ton) is as follows:
Po = Io
x Rave =
2
(Ndot x Rcom Rave + Ric)
SYMBOL
PARAMETER
Rave
Average resistance
Rcom
Common terminal resistance
Ric
ON resistance value of Driver IC
5.1 Block diagram of the electrical circuit
VH (+24V)
GND
TM
VDD (+3.3V)
STB4
STB3
STB2
STB1
LATCH
DATA IN
CLOCK
Each STB Line is pulled-down within the driver IC .
STB No .
Dot No .
1
1 ~ 256
2
257 ~ 352
3
353 ~ 448
4
449 ~ 640
Vset
2
x Rave
2
VALUE
1, 2, 3
4, 5, 6
8
THERMISTOR
30KΩ B:3950
7
12
11
10
9
14
15
13
Number of Dots
256
96
96
192
Eo
Ton =
Po
UNIT
800
Ω
0 .07
Ω
33
Ω
DOT #640
DOT #448
4
LATCH REGISTER
640 BIT SHIFT REGISTER
DOT #352
DOT #256
3
2
1
17
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