Epson Scan 2500 service manual 1 B102 PSB/PSE Board, Application of DC Voltage

EPSON Stylus Scan 2500 Revision A

2.5.1 B102 PSB/PSE Board

The power supply board for the EPSON Stylus Scan 2500 generates +42VDC to drive the motors, +24VDC to drive the scanner and option, +12VDC to power the lamp, and +5VDC/+3.3VDC to power the printer logic. The table below shows application of voltages generated by PSB/PSE board.

1.Even if power is turned off during the middle of a print job, since the driving power is turned off after the carriage goes back to the carriage lock position, the possibility of clogged ink nozzles is reduced.

2.If power is turned off while paper is being fed in the printer, the same operation mentioned above is performed and the driving power is turned off after the paper is completely ejected. The time allowed is approximately 30 seconds, meaning voltage is flowing for 30 seconds after the power is turned off.

Application of DC Voltage

Voltage		Application
		Printer		Scanner
	•	CR Motor
+42VDC	•	PF/Pump Motor
	•	Printhead drive
+24VDC			•	Scanner Motor
			•	Option unit drive
+12VDC			Inverter board
			CCD sensor board
		Common
		Control circuit
+5VDC		Sensors (CR HP, PE, ASF)
		Control panel
		Printhead control
		Option unit logic
+3.3VDC		Control circuit

Figure 2-22 shows a block diagram of power supply board. The process from the input of AC voltage to the output of DC voltage is explained in the following pages.

Operating Principles Electrical Circuit Operating Principles 55