BIXOLON service manual Special Circuit Descriptions, SRP-350/352plusA&C, Power Circuit, Voltage

SRP-350/352plusA&C

4-3 Special Circuit Descriptions

4-3-1 Power Circuit

This system is operated under 100Vac or 240Vac. The power circuit supplies the three differential DC voltage sources.

		[Figure 4-3 Power Block Diagram]
No.	VOLTAGE		DESCRIPTION
1	VPP(+24VDC)		Cash Drawer Solenoid Driving / Step Motor Voltage
2	VTH(+24VDC)		Thermal Printer Head (TPH) Voltage
3	Vdw(+7.8VDC)		CPU Download Voltage
4	Vcc(+5VDC)		Logic, Sensor Voltage
5	Vdd(+3.3VDC)		CPU, Flesh, SRAM, Reset Voltage
6	Vdd(+2.5VDC)		USB core Voltage

1)Drawer Driving and Feed, Auto Cutter Motor Voltage, TPH Driving Voltage : +24VDC +24VDC is supplied from SMPS. This Voltage is smoothed by capacitors (CL1).

This voltage is used as a Cash Drawer Solenoid Driving voltage, Step motor driving voltage and a source voltage of the other voltage sources and TPH Driving Voltage.

2)Voltage : +7.8V (CPU Download Voltage)

Change the input 24V to 7.8V by a regulation. U1(LM2575S-ADJ)

3) Logic IC Driving Voltage: +5V

Change the input 7.8V to 5V by a regulation. U2(BA17805-E2)

4) CPU, Flesh, SRAM, Reset Voltage: +3.3V

Change the input 7.8V to 3.3V by a regulation. U3(BA033FP-E2)

5) USB core Voltage: +2.5V

Change the input 5V to 2.5V by a regulation. U202(BH25FB1WHFV)

Rev. 2.01 - 34 -