Chapter 2
Principles of Operation
Overview ......................................................................................... 2-1
Connector Summary .................................................................. 2-1
Overview of Printer Mechanism Operation .............................. 2-3
Sensors ................................................................................. 2-4
Motors .................................................................................. 2-6
Printhead ............................................................................. 2-6
Circuit Overview........................................................................ 2-7
Firmware Overview ................................................................... 2-8
Principles of Operation .................................................................... 2-9
Power Supply Circuit ................................................................. 2-9
Power supply circuit block diagram .................................... 2-9
Chopper-type switching regulator circuit............................ 2-11
Filter circuit ......................................................................... 2-13
Transformer ......................................................................... 2-14
Rectifier and smoothing circuit ........................................... 2-15
+5 VDC regulator circuit .................................................... 2-16
pulse width modulation circuit ........................................... 2-19
+24 VDC regulator circuit .................................................. 2-21
Vx voltage supply circuit ..................................................... 2-24
Reset Circuit .............................................................................. 2-25
Power on or off ..................................................................... 2-26
-INIT signal input from CN1 .............................................. 2-26
ROM cartridge installation and removal ............................ 2-27
Address Decoder and Bank Register ......................................... 2-29
Address decoder.................................................................... 2-29
Bank register ....................................................................... 2-29
Carriage Operation ................................................................... 2-30
Carriage mechanism ...........................................................
Carriage motor drive circuit block diagram ....................... 2-31
Gate array E0lA05 in the carriage motor
drive circuit .................................................................... 2-32
Carriage motor drive circuit ................................................ 2-33
Carriage motor software control.......................................... 2-38
Paper Feeding ........................................................................... 2-43
Paper feed mechanism ........................................................ 2-43
Paper feed motor drive circuit ............................................. 2-45
Paper feed motor software control ....................................... 2-46
Printhead ................................................................................... 2-47
Printing ............................................................................... 2-47
Printhead drive circuit block diagram................................. 2-48
Gate array E05A02 in the printhead
drive circuit .................................................................... 2-49
Printhead drive circuit ......................................................... 2-50
Printhead software control .................................................. 2-51
A/D Converter Circuit ............................................................... 2-52
Host Interface ............................................................................ 2-55
Ribbon Feed Mechanism............................................................ 2-56
LQ-200/AP3000 2-i
Summary of Contents for ActionPrinter 3000
Page 1: ...EPSON LQ 200 ActionPrinterTM 3000 Service Manual Revision Level I Printed on recycled paper ...
Page 21: ... Normal character General Description Figure 1 5 Character Matrix LG 200 AP3000 1 13 ...
Page 97: ...Principles of Operation Figure 2 51 A D Converter Circuit LQ200 AP3000 2 53 ...
Page 101: ...Principles of Operation Figure 2 53 Ribbon Feed Mechanism LQ 200 AP3000 2 57 ...
Page 153: ...Table 5 1 Symptoms and Reference Pages 5 2 LQ 200 AP3000 ...
Page 155: ...Troubleshooting Abnormal Carriage Operation LQ 2OO AP3000 ...
Page 157: ...Troubleshooting Figure 5 2 Printhead Resistance 5 6 LQ 200 AP3000 ...
Page 158: ...Abnormal Paper Feed but Normal Printing LQ200 AP3000 5 7 ...
Page 159: ...Troubleshooting Abnormal Operation of the Control Panel 5 8 LQ 200 AP3000 ...
Page 162: ...Table 5 2 Repair of the Main Board cont LQ 2OO AP3000 5 11 ...
Page 163: ...Table 5 2 Repair of the Main Board cont 5 12 LQ 200 AP3000 ...
Page 164: ...Table 5 2 Repair of the Main Board cont LQ 200 AP3000 5 13 ...
Page 165: ...Troubleshooting Table 5 2 Repair of the Main Board cont 5 14 LQ 200 P3000 ...
Page 166: ...Table 5 2 Repair of the Main Board cont LQ 200 AP3000 5 15 ...
Page 167: ...Troubleshooting Table 5 2 Repair of the Main Board cont 5 16 LQ 2OO AP3000 ...
Page 169: ...Troubleshooting Table 5 3 Repair of the Printer Mechanism cont 5 18 LQ 2OO AP3000 ...
Page 170: ...Troubleshooting Table 5 3 Repair of the Printer Mechanism cont LQ 2OO AP3000 5 19 ...
Page 175: ...Maintenance Figure 6 2 LQ 200 AP3000 Lubrication Points 6 4 LQ 200 AP3000 ...
Page 178: ...Appendix Table A l Board Connector Summary A 2 LQ 200 AP3000 ...
Page 179: ...Circuit Diagrams Figure A 2 C064 MAIN Board Circuit Diagram A 3 LQ 200 AP3000 ...
Page 180: ...Appendix Figure A 3 PEBFILL_II Board Circuit Diagram LQ 2OO AP3000 A 5 ...
Page 181: ...Appendix A 6 Figure A 4 Control Panel Circuit Diagram LQ 200 AP3000 ...
Page 183: ...Appendix Exploded Diagrams Figure A 6 LQ 200 AP3000 Exploded Diagram LQ 200 AP3000 ...
Page 184: ...Appendix Figure A 7 M 5C1O Printer Mechanism Exploded Diagram LQ 200 AP3000 A 9 ...
Page 185: ...A p p e n d i x Figure AS Tractor Exploded Diagram A 10 LQ 200 AP3000 ...
Page 186: ...Table A 2 Part Number Reference Table Note ESG Epson standard gray A 11 ...
Page 188: ...Appendix Figure A 10 LQ 200 AP3000 Case Outline Drawing with Tractor Unit LQ 200 AP3000 A 13 ...
Page 189: ...Appendix Table A 3 Connector CN3 on the CM4 MAINBoard A 14 LQ 2OO AP3000 ...
Page 191: ...Appendix Table AS Connector CN5 on the C064 MAINBoard A 16 LQ 200 AP3000 ...