Epson Stylus COLOR 3000 Service Manual - Page 60

EPSON Stylus COLOR 3000 ASF_PQ :Output from the PQ (Paper Quantity) sensor. The paper quantity sensor uses a sliding potentionmeter. (The maximum resistance:10 ohms) The sensor ,attached to the right edged guide in the hopper assembly, detects the paper quantity between the maximum of 15 mm and the minimum of 3 mm. The detected quantity is converted into the corresponding resistance and the information is transferred to the analog port of the . When the sensor detects the condition of 3.6 mm which accommodates 25 sheets of 55 kg/m2-paper, it outputs the signal . GAP : Output from the PG (Platen Gap) sensor. The sensor determines whether the adjust lever is set to the thin paper side or thick paper side. The signal is when the lever is on the thick paper side, and on the thin paper side. This sensor uses a mechanical switch. REL : Output from the release sensor. Release sensor attached to the left and rear side of the printer mechanism determines whether the release lever is set to friction feed side or tractor side. The signal is on the tractor side and is on the friction feed side. CR_PW : Output from the CR PW (Paper Width) sensor. The sensor, attached to the left side of the unit, uses a photo interrupt system. While the makes 1 return in the paper width seek mode, sensor reads the voltage level of the output signal at each motor phase change pulse to determine the positions for the both edges of the paper. This operation prevents printing on the platen. In case no change is detected in paper size from the previous paper by the sensor and ASF PL sensor, the sensor is not activated. The signal output from this sensor is directly sent to the analog port of the . Figure 2-21 shows the sensor circuit block diagram. Figure 2-17. Sensor Circuit Block Diagram Rev. A 2-19