Chapter 2 Operating Principles
2-2.
Operation of Control Parts
2-21
CL-E720DT
If the temperature of the “SA Head” exceeds 100
C (212
F), the head temperature sensor
output voltage becomes lower than the reference voltage, and pin 1 of U7A goes to “Low” level.
At this time, pin K1 (nTMPERR) is “Low” and the FPGA (U5) detects an abnormally high
temperature.
In this abnormal state, the printer stops +24V DC supply to the “SA Head”. Also it stops +24V
DC supply to the “SA PF Motor”.
(4)
PF motor temperature sensor
The PF motor temperature sensor is used to detect the temperature of the “SA PF Motor”. This
sensor is a thermistor bonded to the “SA PF Motor”.
Since the resistance of the thermistor changes according to the temperature change, the
voltage at pin 97 (TMPPF) of the CPU (U1A) changes accordingly. The CPU senses the
voltage at pin 97 (TMPPF) to detect the temperature of the “SA PF Motor”.
Printing operation when the “SA PF Motor” temperature rises:
When the temperature of the “SA PF Motor” rises to 95
C (203
F), printing speed is reduced to
avoid overheating. If it reaches 105°C (221°F), the “SA PF Motor” stops after printing the
current label. In this case, the LED on the operation panel blinks in red and the LCD displays
“Error PFMotor Hot”, and the printer goes off-line.
When the temperature of the “SA PF Motor” falls below 90
C (194
F), the LED and LCD
returns to normal display, and printing automatically resumes.
90°C
(194°F)
95°C
(203°F)
Normal speed
(Stop)
Normal speed
Normal speed
105°C
(221°F)
Low speed
(Stops)
(Stop)
1
J6
M
[SA PF Motor]
2
Thermistor
R85
C126
R86
PF Motor
Temperature Sensor
TMPPF
AN3
97
U7B
-
+
5
6
7
+3.3V
+3.3V
[SA Main PCB]
TEMP ERROR Detection
TMPPF
BA2903SFVM
R34
+3.3V
R32
C49
R33
N3
K1
33_N3
21_K1
FPGA
nTMPERR
nTMPENB
Error: Low
U5
CPU
U1A
Summary of Contents for CL-E720DT
Page 1: ...Technical Manual CL E720DT Direct Thermal Barcode Label Printer ...
Page 5: ...Chapter 1 Specifications 1 1 CL E720DT CHAPTER 1 SPECIFICATIONS ...
Page 15: ...Chapter 2 Operating Principles 2 1 CL E720DT CHAPTER 2 OPERATING PRINCIPLES ...
Page 75: ...Chapter 3 Disassembly and Maintenance 3 1 CL E720DT CHAPTER 3 DISASSEMBLY AND MAINTENANCE ...
Page 119: ...Chapter 4 Troubleshooting 4 1 CL E720DT CHAPTER 4 TROUBLESHOOTING ...
Page 131: ...Chapter 5 Parts Lists 5 1 CL E720DT CHAPTER 5 PARTS LISTS ...
Page 159: ...Chapter 5 Parts Lists 5 29 CL E720DT DRAWING NO 7 Unit Opepane Rev 0 ...
Page 162: ...Chapter 5 Parts Lists CL E720DT 5 32 DRAWING NO 8 Accessories Rev 0 3 2 1 1 1 2 1 3 ...
Page 164: ...Chapter 6 Circuit Diagrams 6 1 CL E720DT CHAPTER 6 CIRCUIT DIAGRAMS ...
Page 183: ...Appendices AP 1 CL E720DT APPENDICES ...
Page 186: ...Appendices A Mounting Diagrams CL E720DT AP 4 2 Solder side ...