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Operation of Control Parts
CL-S6621 2-28
85°C
(185°F)
90°C
(194°F)
Normal speed
(Stop)
Normal speed
Normal speed
95°C
(203°F)
Low speed
(Stops)
(Stop)
(5) 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 a temperature change, the voltage at pin 8 (PFTMP) of U1A (CPU)
changes accordingly. The CPU senses the voltage at pin 8 (PFTMP) to detect the PF motor
temperature.
Printing operation when motor temperature rises:
When the temperature of the “SA PF Motor” rises above 90°C (194°F), printing speed is
reduced to avoid overheating. If it reaches 95°C (203°F), the “SA PF Motor” stops after printing
the current label. In this case, the PRINT LED and CONDITION LED alternately blink on the
operation panel.
When the temperature of the “SA PF Motor” falls below 85°C (185°F), the LEDs stop blink and
printing will be resumed.
For further safety, an abnormally high temperature detection circuit is provided. In case this
circuit is activated, the System error is displayed, and the printer stops.
The comparator U16A detects if the level at pin 8 (PFTMP) (i.e., the temperature of the “SA PF
Motor”) exceeds a certain reference level determined by the output from pin C11
(nTEMP_ENABLE) of U14 (FPGA) (i.e., the predetermined allowable limit temperature). If it
does, nTEMP_ERROR at pin C6 goes “Low” level and this signal is fed to U14 (FPGA). Then,
the System error is displayed and the printer stops. At this time, nTEMP_ENABLE at pin C11 is
set to “Low” level so that nTEMP_ERROR is securely maintained at “Low” level. (To clear the
System error, you need to turn OFF the printer once and then turn it ON.)
1
J7
M
SA PF Motor
2
Thermistor
R63
C94
R64
PFTMP
U1A
CPU
ANI3
8
U16A
BA2903SFV
-
+
3
2
1
+3.3V
R39
+3.3V
R40
C41
R41
R42
C11
C6
B2_28
B2_27
U14
FPGA
nTEMP_ERROR
nTEMP_ENABLE
PFTMP
+3.3V
[SA, Main PCB]
TEMP ERROR Detection
Error: Low