II- 16
2.3.6
Head Temperature Detect Circuit
QL-1050 measures the following temperature.
- Head temperature: The CPU determines the ambient temperature of the head from the AD
converted voltage value input to TH (78pin) of the CPU via CN13.
Fig. 2.3-8 Head Temperature Detect Circuit
2.3.7
Cutter Home Position Sensor Circuit
QL-1050 identifies open/close of the cutter from the status of mechanical switch.
Closing the cutter, the cutter home position sensor opens.
The change of status is sent as the signal through CN10 to CUTSEN (74 pin) of the CPU.
QL-1050 first confirms
that the cutter stays on its’ home position prior to printing.
When the cutter returns to the home position, the cutter home position sensor circuit
recognizes it and stops the DC motor rotation.
Fig. 2.3-9 Cutter Home Position Sensor Circuit
2.3.8 Reset
Circuit
QL-1050 receives the electric power from the power supply PCB and 5V and +3v to
the CPU.
When the power is supplied, the reset circuit (U10) returns high to reset input pin (66pin) of
the CPU when detecting the voltage the +3V voltage line rises over +2.8V. This input
releases the reset status of CPU.
If the +3V voltage line drop to +2.8V or lower due to any reason during operation, the reset
circuits returns Low signal to the CPU and the CPU goes to the reset status.
Fig. 2.3-10 Reset Circuit
