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3-4. SUPERVISION CIRCUIT FOR THERMAL HEAD TEMPERATURE
(1) Function
Thermal head temperature is disposed to convert voltage to digital data by using A/D converter of IC1. The CPU decides
the strobe width of the thermal head according to this value. Therefore, this circuit can keep the thermal head at an even
temperature in order to stabilize the printing density and prevent the head from being overheated.
TH-
HEAD
5V
A
0V
B
0V
C
Circuit Diagram
A
C37
R47
R48
R49
C38
Timing Chart
Effective signal
ref LEVEL CLAMP
C39
B
C
1.5V
| 135 |
KX-F910BX
28
STB1
27
STB2
26
STB3
25
STB4
22
THDAT
24
THCLK
23
THLAT
49
ADSEL1
38
AIN2
IC1
IC1 internal bias
CLAMP
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