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

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2.2 OUTLINE OF CONTROL ELECTRONICS
Fig. 2.2-1 shows the block diagram of the control electronics. The control electronics consist of
the following components.
Fig. 2.2-1 Block Diagram of the Control Electronics
2.2.1 Main PCB ASSY
This manages all the components. This PCB consists of CPU, EEPROM, USB chip and motor
drivers etc.
2.2.2 Media Type Detect Switch PCB (Media PCB ASSY)
The sensor (mechanical SW) that detects media type and size is connected to main PCB ASSY.
A semi-fixed resistance (VR) for adjustment of the media position detect sensor is mounted on it.
2.2.3 Media Position Detect Sensor PCB (Tape Sensor PCB ASSY)
This sensor detects the printing start position for the die cut label, and checks existence of the
zebra pattern media using refection type photo sensor for the free length label.