Panasonic KX-FT21BX

CIRCUIT OPERATIONS
- 123 -
KX-FT21LA
MAIN BOARD
170
THON
GATE ARRAY
(IC1)
THLAT
THDAT
THCLK
THLAT
THDAT
THCLK
STB1
STB2
AIN2
+24V
CN4
+24V
+24V
+24V
+5V
VDD
GND
CLOCK
SI
TM
STROBE1
STROBE2
R70
R75
R74 Q13
R71
R69
R67
R68
2
10
7
8
9
10
3
9
6
8
4
5
5
4
2
3
11
1
167
163
166
159
160
207
C77
R73
R66
C75
L3
L18
C74
THERMISTOR
THERMAL HEAD
NO.1 NO.2
NO.19
LATCH REGISTER
SHIFT REGISTER
LATCH REGISTER
SHIFT REGISTER
192DOT 192DOT
1
6
11 7
Q8
LATCH
GND
Circuit Diagram
10
THDAT
7
THCLK
2 THLAT
3 STB1
9 STB2
9.216 msec (COPY)
PRINT DATA
(3.0µsecX1728)
5.184msec
NEXT LINE PRINT DATA
3.0µsec
3.0µsec
3.0µsec
3.0µsec
about 4.0 msec (at 25¡C)
about 3.2 msec (at 25¡C)
TEMPERATURE OF THERMAL HEAD
TEMPERATURE OF THERMAL HEAD
1728 pcs320 pcs1728 pcs
CN4
Timing Chart