Epson SEIJ98006 manual 4. Linear Encoder Specifications, 5. Ink Cartridge Sensor Specifications

EPSON Stylus Color 900 Revision C

Table 2-4. Linear Encoder Specifications

No.	Item	Specifications
1	Type	Radiative Incremental encoder module
2	Drive voltage	5 VDC ± 5%
3	Output	Phase A/B 2-channel digital output (TTL level)
	waveform
4	Minimum step	1/180 inch (increment of the lines on the linear scale)
5	Response	20 KHz
	frequency

The ASIC (IC2) reads the linear scale (increment: 1/180 inch) and internally divides data by 8. The read information is used to produce basic drive frequency for 2880-dpi trapezoidal waveform production. If the encoder is defective or in an undetectable condition, the printer generates a fatal error immediately after power on. This error occurs before the carriage’s home position seeking operation.

Beside detecting the carriage position, the CRHP sensor also serves to determine whether or not the carriage is working properly. If the setting signals (pulses) sent from the encoder do not reach the specified level while the CR is moving in the acceleration / constant / deceleration modes in its operative range, the program consequently assumes that paper is jamming or the carriage is operating irregularly, and shows the paper jam error by bringing up the LEDs of the corresponding combination.

The printer is equipped with 2 actuators used to detect the ink cartridges in the carriage unit driven by the CR motor. The printer, however, is designed to operate the actuators only when both black and color ink cartridges are installed. See Table 2-5 and Table 2-6 for the ink cartridge sensor specifications and ink cartridge sensor switch mode, respectively.

Table 2-5. Ink Cartridge Sensor Specifications

No.	Item	Specifications
1	Detection type	Using a micro switch
2	Rated voltage	5 VDC ± 5%
3	Rated current	10 mA
4	Contact resistance	50 mΩ

Table 2-6. Ink Cartridge Sensor Switch Mode

Cartridge	Sensor Status	Sensor Output
Absent	Open	2.4 VDC or more
Present	Closed	0.7 VDC or more

If the ink cartridge sensor is defective or in an endetectable condition, the printer shows No Ink Cartridge Error immediately after the printer is turned on.

Operating Principles Printer Mechanism Operating Principles 47