Brother QL 570 - P-Touch B/W Direct Thermal Printer, Service Manual

Page: 24 / 122

II- 15
2.3.6 Head Temperature Detect Circuit
This circuit measures the temperature described below.
Head temperature: The CPU determines the ambient temperature of the head from the AD
converted voltage value input to TH (98 pin) of the CPU via CN3.
Thermal head
Fig. 2.3-8 Head Temperature Detect Circuit
2.3.7 Cutter Home Position Detect Sensor Circuit
Confirm that the cutter stays on its' home position prior to printing.
When the cutter returns to the home position, the cutter home position detect sensor circuit
recognizes it and stops the DC motor driving.
The sensor uses a micro switch to detect the position of the cutter.
Cutter sensor
Fig. 2.3-9 Cutter Home Position Detect Sensor Circuit