Cutter Control Circuit (For Optional Cutter) - Citizen CL-S6621 Technical Manual

(9) Cutter control circuit (for optional cutter)

The cutter control circuit supplies VMT (+24V) to an optional cutter.
When a cutter is installed in the printer, pin 81 (CPRTYP0) is set to "Low" level. With this "Low"
level signal, the printer recognizes the connected cutter. (The CPU judges the connected
optional device (either peeler or cutter) by detecting signals CPRTYP0 (at pin 81) and
CPRTYP1 (at pin 80). The signal CPRTYP1 for an optional peer is now at "High" level (not
connected). ) The cutter action is controlled by the signals CUTCON0 and CUTCON1 (at pins
N1 and N2) output from U14 (FPGA). The cutter home position signal is input to pin 118
(CUTHP) of U1A (CPU).
A thermistor is attached to the cutter motor for detecting the motor temperature. The signal
from the thermistor is input to pin 12 (CUTTMP) of U1A (CPU). The CPU detects the
temperature by monitoring the signal CUTTMP and, if the temperature reaches 78 ° C (108.4 ° F),
the cutter motor stops its operation. At this time, an error is issued and the PRINT LED and
CONDITION LED blink alternatively. Wait until the cutter motor gets cool. When the
temperature of the cutter motor falls below 70°C (185°F), the cutter operation will automatically
resume.
U14
FPGA
CUTCON0
B1_33
N1
B1_34
N2
U1A
CPU
CUTHP
D20
118
CPRTYP0
PCT2
81
CPRTYP1
PCT3
80
CUTTMP
(PEELSENS)
ANI7
12
Switch: ON (Fixed)
U14
FPGA
nTEMP_ENABLE
B2_28
C11
nTEMP_ERROR
B2_27
C6
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.
CUTCON1
C98
L: When Cutter installed.
+3.3V
R84
4
CUTTMP
2 1
U5
(Analog Switch)
+3.3V
R40
R41
R42
Error: Low
(+24V)
VMT
+3.3V
RA18
R77
+3.3V
R82
R85
C101
Q11
DTC114EM
+3.3V
R79
R81
C100
TEMP ERROR Detection
+3.3V
R39
U17B
CUTTMP
+
7
5
-
6
C41
BA2903SFV
[SA, Main PCB]
2-41
Operation of Control Parts
J10
Cutter Control Circuit
1
+24V
2
+24V
3
CUTCTL0
4
CUTCTL1
5
CUTHP
6
CUTTH
7
CPRTYP0
8
GND
9
GND
10
GND
CL-S6621