Paper Feed Mechanism
This printer’s paper feed mechanism consists of the built-in auto sheet feeder (ASF), push tractor,
paper feed (PF) motor, front/rear paper end (PE) sensors, PF roller, eject roller unit, and disengage
mechanism. The PF motor is a 4-phase, 48-pole, PM-type stepping motor that directly drives the
paper feed mechanism (for paper advancing and paper pickup). This motor also drives the pump
mechanism, but only when the printer is in the cleaning state. The paper feed mechanism is driven
using a 1-2 phase drive method, except in the paper feed drive sequence (W1-2 phase). The paper
feed mechanism is illustrated in Figure 2-6.
The disengage mechanism switches PF motor torque between the PF drive and pump drive via the
carriage unit stop positions. PF motor torque is transmitted to the PF roller via the PF motor
pinion, disengage mechanism, and gear train. The torque is then separated for each of the two
directions of the PF roller. One direction of torque transmission is used to drive the paper-ejecting
mechanism via the gear train of the upper paper guide assembly. The other direction is used to
drive the push tractor or ASF mechanism.
Table 2-3. Paper Feed Motor Specifications
Item
Description
Motor type
4-phase, 96-pole, HB-type
Drive voltage
+42 VDC
±
5%
Coil resistance
10
Ω ±
10%
Drive frequency
300 - 2160 Hz
Excitation mode
❑
Constant current bipolar drive
❑
Paper feed / pump drive: 2-2 phase, W1-2 phase
Minimum step
1/720" (2-2 phase)
Table 2-4. Drive Terms (Paper Feed Mechanism)
Mode
Frequency
(Hz)
Current Value (A / Phase)
Acceleration
W1-2 / 2-2
Phase
Constant
Deceleration
W1-2 / 2-2
Phase
Rush
(before
/ after)
Paper loading (ASF)
2160
0.9 / 0.9
0.9
0.75 / 0.75
0.6 / 0.6
Paper feed
2160
0.9 / 0.9
0.9
0.75 / 0.75
0.6 / 0.6
Pump drive
700
— / 0.9
0.9
0.9 / —
0.75 / 0.75
Pump drive
(lower speed)
300
— / —
0.9
— / —
0.75 / 0.75
Note:
Hold current is 0.6 A.
Operating Principles
EPSON Stylus 1500 Service Manual
2-7
Summary of Contents for Stylus 1500
Page 1: ...EPSON AMERICA INC Stylus 1500 EPSON Service Manual TM STYLUS15 ...
Page 2: ...EPSON Stylus 1500 Service Manual Revision Date 1st Printing 1 25 96 ...
Page 3: ...ii EPSON Stylus 1500 Service Manual ...
Page 105: ...Adjustments 4 2 EPSON Stylus 1500 Service Manual ...
Page 132: ...Troubleshooting 5 2 EPSON Stylus 1500 Service Manual ...
Page 149: ...Maintenance 6 2 EPSON Stylus 1500 Service Manual ...
Page 156: ...Appendix A 2 EPSON Stylus 1500 Service Manual ...
Page 166: ...Appendix A 12 EPSON Stylus 1500 Service Manual ...
Page 167: ...Figure A 3 C172 MAIN Board Circuit Diagram 2 Appendix EPSON Stylus 1500 Service Manual A 13 ...
Page 168: ...Appendix A 14 EPSON Stylus 1500 Service Manual ...
Page 172: ...Figure A 7 C172 MAIN Board Component Layout Appendix A 18 EPSON Stylus 1500 Service Manual ...
Page 174: ...Figure A 9 C172 PNL Board Component Layout Appendix A 20 EPSON Stylus 1500 Service Manual ...
Page 175: ...Figure A 10 Stylus 1500 Exploded Diagram 1 Appendix EPSON Stylus 1500 Service Manual A 21 ...
Page 178: ...Appendix A 24 EPSON Stylus 1500 Service Manual ...