Citizen CLP-621 - 3 Printer Adjustments; Sensor Adjustments Overview

2-2. Operation of Control Parts
2-27 CLP-621 & CLP-631
(3-6) Ribbon motor temperature sensor
The ribbon motor temperature sensor is used to detect the temperature of the Ribbon
Motor F on the take-up side. This sensor is a thermistor bonded to the Ribbon Motor F.
Since the resistance of the thermistor changes according to the temperature change, the
voltage at pin 11 (ENVTMP) of IC1 (CPU) changes accordingly. The CPU senses the
voltage at pin 11 to detect the ribbon motor temperature.
5
CN702
M
Ribbon Motor F
(Take-up Side)
6
Thermistor
R113
C73
IC1
CPU
[Ribbon Main PCB]
ENVTMP
ANI6
11
9
CN701
20
+3.3V
1
12
CN8
[Main PCB]
Printing operation at ribbon motor temperature rise:
When the temperature of the Ribbon Motor F reaches 85
°C (185°F), the ribbon motor
stops after printing the current label. In this case, PRINT LED and CONDITION LED
alternately blink on the operation panel.
When the temperature of the Ribbon Motor F falls below 80
°C (176°F), LEDs stop blink
and printing resumes.
80°C
(176
°F)
85°C
(185
°F)
Normal speed
(Stop)
Normal speed
Normal speed
(Stops)