Epson Photo750 manual Sensor Circuit

EPSON Stylus Photo 750 Revision A

2.2.2.3 Sensor Circuit

The following sensor circuits are mounted on the C259 Main Control Circuit.

†HP Sensor

HP sensor uses the photo interrupter method. A HP sensor detects the carriage home position. It is used for managing printing position and cleaning, etc.

†PE Sensor

PE sensor uses the photo interrupter method. A PE sensor determines if there is a paper in the printer. Based on the signal from this sensor, a particular page edge treatment such as Micro- weave printing is performed.

†ASF Sensor

ASF sensor uses the photo interrupter method. An ASF sensor detects the position of return lever when the power is turned on, and causes the paper to be picked up by the pick up roller fro the normal initial position.

†Thermistor Sensor (TH)

This sensor is mounted on the print head board and measures the temperature around the head. It keeps stable printing quality, changing PZT drive voltage(VH) slightly according to changes of environmental temperature.

†Black/Color Cartridge Sensor(COB/COC)

Cartridge sensor uses the mechanical method. The sensor detects if the cartridge is installed or not.

IC 2			+5V	ASFV
E05B58**			+5V	GND	CN4
SWA0		97	+5V	ASF	ASF
			+5V	HPV
			+5V	GND	CN5
SWA1		98	+5V	HP	HP
			+5V	PEV
			+5V	GND	CN6
SWA2		99	+5V	PE	PE
SWC0				COB
SWC1				coc
				GND
					CN9
CPU	AN0			THM
					op06

Figure 2-6. Sensor Circuit

Operating Principles Operating Principles of Electric Circuit 34