Epson LX-850 Specifications Page 34
- Page / 176
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
REV.-A
CHAPTER 2
PRINCIPLES OF OPERATION
2.1
2.2
OVERVIEW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2.1.1 Connector Summary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-1
2.1.2 Outline of Printer Mechanism Operation . . . . . . . . . . . . . . . . . . . . . . 2-3
2.1.2.1 Sensors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-4
2.1.2.2
Mc~tors
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-7
2.1.2.3
Printhead
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
2-7
2.1.3 Circuit Overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-8
PRINCIPLES OF OPERATION
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-10
2.2.1 Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
2-10
2.2.1.1 TA Filter Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
2-11
2.2.1.2 + 12V DC Power Supply Circuit . . . . . . . . . . . . . . . . . . . . 2-12
2.2.1.3
+2!4V
DC Power Supply Circuit . . . . . . . . . . . . . . . . . . . . 2-13
2.2.1.4 +5A/ DC Power Supply Circuit . . . . . . . . . . . . . . . . . . . . . . . 2-19
2.2.2 Reset Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-20
2.2.2.1 Power-on Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-20
2.2.2.2 Operation at Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21
2.2.2.3 Power-off Reset
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-21
2.2.3 Carriage Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-22
2.2.3.1 Carriage Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22
2.2.3.2 Carriage Motor Specification
. . . . . . . . . . . . . . . . . . . . . . . . . .
2-22
2.2.3.3 Carriage Motor Drive Circuit
Block Diagram
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-23
2.2.3.4 Carriage Motor Drive Circuit
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2-24
2.2.3.5 Carriage Motor Software Control ................. 2-32
2.2.4 Paper Feed
. . . . . . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-35
2.2.4.1 Paper Feed Mechanism Operation ................ 2-35
2.2.4.2 Paper-Feed Motor Specifications ................... 2-36
2.2.4.3 Paper-Feed Motor Drive Circuit . . . . . . . . . . . . . . . . . . . . . . 2-37
2.2.4.4 Paper-Feed Motor Software Control ............. 2-38
2.2.5
Printhead
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-39
2.2.5.1
Printhead
Printing Operation
. . . . . . . . . . . . . . . . . . . . . . . . . .
2-39
2.2.5.2
Printhead
Specification
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2-39
2.2.5.3
Printhead
Drive Circuit Block Diagram ....... 2-40
2.2.5.4 Gate Array E05A30 Operation in
Printhead
Drive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.
2-40
2-i
- LX-810/850 1
- PRECAUTIONS 3
- REVISION TABLE 5
- TABLE OF CONTENTS 6
- CHAPTER 1 7
- GENERAL DESCRIPTION 7
- FEATURES 9
- Hardware Specifications 11
- Si_k&lL 12
- Figure 1 14
- Cut-Sheet Printing Area 14
- 3mm min 16
- Printing Columns 19
- See Table 1-10 19
- 1.3 INTERFACE OVERVIEW 20
- 1.4.1 DIP Switch Settings 23
- SELECTYPE 24
- FUNCTION 24
- TEAR-OFF 25
- FUNCTION 25
- 1.8 OPERATING INSTRUCTIONS 26
- 1.8.3 Buzzer Operation 28
- Beeps indefinitely until 28
- 1.6 MAIN COMPONENTS 30
- Control Panel 31
- 1.6.5 Housing 33
- 1-15. Housing 33
- CHAPTER 2 34
- PRINCIPLES OF OPERATION 34
- 2.1 OVERVIEW 37
- Optional 38
- Interface 38
- && 40
- <o—————u 41
- ‘Usir+km+=l 44
- ● EEPROM 45
- ● Power supply circuit 45
- 2.2.1.1 TA Filter Unit 47
- Figure 2-13 48
- 12V DC Power Supply Circuit 48
- Frb’+a*b 49
- Feedback Circuit 51
- Im_IL’’’’ompara’or 53
- UPC494C 54
- 2.2.2 Reset Circuit 56
- Power-off Reset 57
- : Driving Pulley 58
- PD78 10HG 59
- Figure 2-27. SLA7020M Circuit 61
- ““’’’-r’”’ 63
- Table 2-3. Reference Voltage 64
- ON then 66
- ON to IOFF 66
- ON increases 67
- D voltage reaches the 67
- D voltage 67
- C Phase D 68
- -f-e’’Jw-JL&aau 69
- --JvLODJm-J_ 70
- @~{’aperTe~~~~~~~con.ear 71
- ~>TractOrReductiOn 72
- Printhead 75
- This section describes the 75
- operation 75
- $:q:&J1-n—rL 78
- Figure 2-48 79
- 2.2.6 Host Interface 80
- 2.2.8 Ribbon-feed Mechanism 82
- CHAPTER 3 83
- OPTIONAL EQUIPMENT 83
- Cat. No 85
- X-ON/X -OFF 86
- 3.2 CUT SHEET FEEDER C80612* 88
- (0.0039 inches) 89
- 8.5mm(0..33”) 90
- Cut Sheet Feeder Mode 92
- E#j’::::d/w 93
- ‘. . . 94
- E-ring (6) 95
- Figure 3-7. E-Ring Removal 96
- PULL TRACTOR 100
- (@-ring’” 102
- Marks to ‘be Matched 103
- CHAPTER 4 104
- DISASSEMBLY, ASSEMBLY, AND 104
- ADJUSTMENT 104
- LIST OF FIGURES 104
- LIST OF TABLES 106
- JiMwf!3a 108
- DISASSEMBLY AND REASSEMBLY 109
- Casing Removal -1 111
- 4.2.2.2 113
- 3. Remove 115
- (M3 X 6) 115
- Removal of Printer Mechanism 116
- Remove the GND spring 117
- PaDer Guide 118
- Frame (R) 122
- Flat Spring 124
- Shaft Ground 125
- NOTES FOR REASSEMBLY: 129
- Home Position Sensor 130
- NOTES FOR REASSEMBLY 132
- CHAPTER 5 135
- TROUBLESHOOTING 135
- 5.1 GENERAL 136
- UNIT REPLACEMENT 136
- (5) Abnormal Control 143
- UNIT REPAIR 145
- Check point 148
- Solution 148
- Problem Symptom 150
- Symptom Cause 152
- Check point Solution 152
- Printer Mechanism Repair 153
- ● Replace the 154
- 6.1 PREVENTIVE MAINTENANCE 157
- APPENDIX 160
- /APD7810HG 163
- <,”> 165
- (AD7-0) 166
- A.1.2 E05A30 (3B) 168
- SRAM (3D) 170
- A.1.5 SLA7020M (1A) 172
- A.1.6 pPC494C (3A) 173
- A.2 EXPLODED DIAGRAMS AND 174
- SCHEMATICS 174
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