Read Panasonic KX-FT57E Service Manual online
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KX-FT57E
A
A
B
C
B
C
28
27
26
25
22
24
23
49
27
26
25
22
24
23
49
38
STB1
STB2
STB3
STB4
THDAT
THCLK
THLAT
ADSEL1
STB2
STB3
STB4
THDAT
THCLK
THLAT
ADSEL1
AIN2
IC1
C39
C38
R49
R48
R47
C37
THERMAL
HEAD
HEAD
5V
0V
0V
Effective Signal
Bezugspegel-Clamp
1.5V
Internes Vorspannungs-
Clamp von IC1
Clamp von IC1
Circuit Diagram
Timing Chart
3-4. SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE
(1) Function
The thermal head temperature is converted to voltage by the thermistor and changed to digital data by using the 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.
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.
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