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

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Epson SEIJ98006 manual Linear Encoder Specifications, Ink Cartridge Sensor Specifications, Ink Cartridge Sensor Switch Mode
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SEIJ98006 specifications

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