Cover Open Sensor Circuit; Power Supply Pcb - Brother PT-9200PC Service Manual

3.2.13 Cover Open Sensor Circuit

Fig. 3.2-14 shows the cover open sensor circuit.
This circuit detects the open/closed state of the cassette cover.
The sensor input level is low with the cover closed, while it is high with the cover
open.
With the cover open, all drives are disabled.
3.3

POWER SUPPLY PCB

Commercially available power is supplied to the power supply PCB through the
power supply cord, which is inserted into an inlet. The inlet has a total of three
wires, one of which is for grounding, and the other two are for inputting AC voltage
into the power supply PCB. The switching regulator of the power supply PCB
stabilizes the AC voltage to generate DC voltage (VH: +24V ±0.3V for the thermal
head and the DC motor, and Vcc: +5V DC±0.25V for the logic components),
supplying it to the main PCB.
Fig. 3.2-14 Cover Open Sensor Circuit
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