Pf Motor Temperature Sensor - Citizen CL-E700 series Technical Manual

to pin 3.
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" and "SA Ribbon Motor F".

(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".
U1A
CPU
TMPPF
AN3
97
U5
FPGA
nTMPENB
33_N3
N3
nTMPERR
21_K1
K1
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.
Normal speed
Normal speed
C126
TEMP ERROR Detection
+3.3V
U7B
TMPPF
5
R32
+
6
-
R33
BA2903SFVM
C49
Error: Low
nTMPERR
(L: Disables ribbon motor drive.)
Normal speed
90°C
(Stop)
(194°F)
2-27
PF Motor
Temperature Sensor
+3.3V
J6
R85
R86
1
2
+3.3V
R34
7
[SA Main PCB]
Low speed
95°C
(203°F)
Chapter 2 Operating Principles
2-2.
Operation of Control Parts
Thermistor
M
[SA PF Motor]
(Stops)
105°C
(Stop) (221°F)
CL-E700 series