Operating Principles

￿Thermistor

Thermistor is attached onto the color printhead to monitor the temperatures around the printhead. It functions to avoid change in ink viscosity, which affects printing result. The signal output from the sensor is directly transmitted to the analog port of the ￿￿ .

￿ASF_PW : Output from the ASF PW (Paper Width) sensor.

The ASF ￿￿ sensor uses a sliding potentionmeter. (The maximum resistance :10kΩ.) It is attached to the left edge guide in the ASF hopper assembly. By aligning the left edge guide to the paper, the sensor actuator runs along the grooves at the bottom of the stacker. The length measured by the actuator is converted into ohms which corresponds to the paper width, then the value is transferred to the analog port of the ￿￿ . The paper width is detected in 10 ranges between 98 mm and 441 mm. (See Table 2-9.) If the detected paper width does not match the width for the selected page size, the printer ignores the data which does not fit in the printable area of the paper. In case no change is detected in paper size by the ASF PW sensor and ASF PL sensor, the CR PW sensor* is not

activated.

Note) *CR PW sensor: See Page 2-19.

Table 2-9. Paper Width Range

Detecting Range

Paper Width (mm):D

(Length between right and left edge guides)

198=<￿=<108.6 / 123.4=<￿=<141.9

2146.7=<￿=<151.9 / 161.6=<￿=<187.8

3196.6=<￿=<232.1

4231.8=<￿=<260.6

5276=<￿=<283

6293.6=<￿=<300.6

7325.4=<￿=<332.6

8349.6=<￿=<367.6

9416.6=<￿=<423.1

10429.1=<￿=<441

￿ASF_PL : Output from the PL (Paper Length) sensor.

Paper length is determined by three mechanical switches which detect the paper tray condition based on the rear edge guide position and paper tray extension position. Each paper size range is detected by the paper tray condition based on the combination of on/off status of the switches, as shown in Table 2-10. The paper size is determined and memorized by combining the paper width and paper length detected by the ASF PW sensor and the PL sensor.

Table 2-10. Paper Length Detecting Range

 

Paper tray condition

Corresponding sensor combination

 

 

 

 

 

 

Length Range

Rear edge

Paper tray

Switch 1

Switch 2

Switch 3

 

guide

extension

 

 

 

 

 

 

 

 

 

 

Up to 158 mm

0 to 22 mm

In

On

On

Off

Up to 232 mm

Up to 96 mm

In

On

Off

Off

Up to 260 mm

Up to 125 mm

In

Off

On

Off

Up to 283 mm

Up to 147 mm

In

Off

Off

Off

Up to 302 mm

Up to 167 mm

In

Off

On

Off

Up to 623 mm

Down

￿())￿￿ *(+ ,*-￿

On

On

On

+￿.￿ / ,,%

 

 

 

 

 

2-18

Rev. A