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PRINCIPLES OF OPERATION
3 Head-Up Detector
This detector senses the position of the thermal printhead. The leaf switch closes when the printhead is in contact
with the platen, and opens when the printhead is separated from the platen.
Fig. 2-20 Head-Up Detector
4 Cover-Open Detector
This detector senses whether the upper cover is open or closed. The leaf switch closes when the cover closes,
and opens when the cover opens.
Fig. 2-21 Cover-Open Detector
3-4. Auto-Cutter Drive circuit (on TSP242-24/120/230 only)
The TSP242 includes a guillotine-type cutter. The motor rotation direction determines whether the cutter executes a full
cut or a partial cut. (The partial cut leaves paper attached at one point.)
Note that Memory Switch 2 Bit 8 must be set ON to enable use of the cutter.
Fig. 2-22 Auto-Cutter Drive Circuit
P44
CN7
+5V
2
1
IC1
CPU
Leaf Switch
P46
CN1
+5V
1
2
IC1
CPU
Leaf Switch
CN9
P40
2
3
4
5
6
2
8
4
7
3
9
5
OUT
P42
IC3
IC1
CPU
P41
V
CC
VM
VM
V
CC
Switch
Motor
GND
M-GND
GND
VM
C
C
C
C
E
E
10
1
B
B
B
B
TA2
TH3C10
M