Epson SQ-B50/2550 Technical Manual page 65

Figure 2-16. Constant Voltage Control 2-19
Figure 2·17. EA1 Outoput 2-19
Figure 2-18. Over-Current Protection (OCP) 2-20
Figure 2-19. IC494 Internal Circuit 2-21
Figure 2-20. PWM Output 2-22
Figure 2-21. Voltage Limiting Circuit 2-22
Figure 2-22.
±
12 VDC Supply Ciucuit 2-23
Figure 2-23. Friction Feed 2-25
Figure 2-24. Tractor Feed 2-25
Figure 2-25. Paper Feed Motor and Control Circuit
Block Diagram 2-27
Figure 2·26. TM1 Signal and PFA/A Signal
Operation Wave Forms 2-27
Figure 2-27. Paper Feed Motor Control Sequence 2-27
Figure 2-28. SLA7020M Internal Block Diagram 2-28
Figure 2-29. Constant-Current Drive Circuit 2-31
Figure 2-30. Section Operation Wave Forms 2-31
Figure 2·31. Excitation Signal Input Circuit 2·32
Figure 2-32. 2-2 Phase Excitation Timing Chart 2-32
Figure 2-33. TE Holder Mechanism 2-33
Figure 2-34. Top Edge Holding Control Circuit
Block Diagram 2·34
Figure 2-35. TM2 Signal and TEA Signal Operation
Wave Forms 2·35
Figure 2-36. Top Edge Holding Motor Control Sequence
(Independent Mode) 2-35
Figure 2-37. Top Edge Holder Moter Circuit 2·36
Figure 2-38. Operating Waveform
for the Top Edge Holder Moter Driver Circuit 2-36
Figure 2·39. PE Senser and TE Sensor 2·37
Figure 2·40. Senser Interface 2-38
Figure 2·41. Senser Detection 2·38
Figure 2·42. Paper Change Mechanism 2-39
Figure 2·43. Block Diagram
of Paper Change Mechanism Control Circuit 2·40
Figure 2-44. Waveform for Release Solenoid Drive Operation 2·40
Figure 2·45. CSF sensor 2·41
Figure 2-46. Carriage Mechanism 2·43
2-iii
REV.-A