Ribbon Motor Temperature Sensor; Cl-E700 Series - Citizen CL-E700 series Technical Manual

(5) Ribbon motor temperature sensor

The ribbon motor temperature sensor is used to detect the temperature of the "SA Ribbon
Motor F" on the ribbon take-up side. This sensor is a thermistor bonded to the "SA Ribbon
Motor F".
Since the resistance of the thermistor changes according to the temperature change, the
voltage at pin 99 (TMPRIB) of the CPU (U1A) changes accordingly. The CPU senses the
voltage at pin 99 (TMPRIB) to detect the temperature of the "SA Ribbon Motor F".
U1A
CPU
TMPRIB
AN5
99
+3.3V
U5
FPGA
nTMPENB
33_N3
N3
R33
nTMPERR
21_K1
K1
nTMPERR
(L: Disables ribbon motor drive.)
Printing operation when the "SA Ribbon Motor F" temperature rises:
When the temperature of the "SA Ribbon Motor F" reaches 85  C (185  F), the "SA Ribbon
Motor F" stops after printing the current label.
In this case, the LED on the operation panel blinks in red and the LCD displays "Error RBMotor
Hot", and the printer goes off-line. When the temperature of the "SA Ribbon Motor F" falls
below 80  C (176  F), the LED and LCD returns to normal display, and printing automatically
resumes.
Normal speed
Normal speed
Abnormally high temperature detection:
To protect the "SA Ribbon Motor F" from being damaged, an abnormally high temperature
detection circuit is provided. If the temperature of the "SA Ribbon Motor F" exceeds a set
temperature limit, the LED on the operation panel blinks in red and the LCD displays "Error
System Fail", and the printer goes off-line. To recover from the error status, turn OFF the
printer once and then turn it ON.
A reference voltage, i.e., an allowable temperature limit, is applied to pin 2 of the comparator
(U8A), while the sensor output voltage (TMPRIB) from the ribbon motor temperature sensor is
applied to pin 3.
+3.3V
R75
R76
C103
TEMP ERROR Detection
+3.3V
U8A
R32
TMPRIB
3
+
1
2
-
BA2903SFVM
C49
Error: Low
[SA Main PCB]
80  C
(176  F)
J301
J304
J4
24 24 TMP_RIB 13
3-6 3-6
14-16
[SA Relay PCB]
R34
(Stops)
Normal speed
(185  F)
(Stop)
2-29
Chapter 2 Operating Principles
2-2.
Operation of Control Parts
Ribbon Motor
Temperature Sensor
Thermistor
J601 J603
13 1
RBMTH
2
14-16
[SA Ribbon Motor F]
[SA Ribbon
Control PCB]
85  C

CL-E700 series

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