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REV.-B
4.1 GENERAL REPAIR INFORMATION
This chapter describes the disassembly, assembly, and adjustment procedures for replacing any of the
main components of the LX-800.
DANGER
● Prior to beginning the disassembly, assembly, and adjustment procedures, be sure to disconnect
the AC power cord.
● When assembling, disassembling, and adjusting the printer, wear gloves to protect your hands
from being cut by the printer mechanism or an edge of a plate, such as the ground plate.
WARNING
●
The printer mechanism, the various boards, and other parts are sometimes held without screws
by plastic clips. When removing these units be careful not to damage the plastic clips.
The tools and measuring instruments listed in Tables 4-1 and 4-2 are recommended for use when
disassembling and repairing the printers.
—
.—
Table 4-1. Repair Tools
Description
Brush No. 1
Brush No. 2
Cleaning Brush
Round
nose pliers
Diagonal cutting nipper
Tweezers
Electric soldering iron
E-ring holder #2.5”
E-ring holder #5
Phillips screwdriver No. 2
Screwdriver No. O
Thickness gauge (0.47
mm)
Type
o
0
0
0
0
0
0
0
0
0
:
Part No.
B74 1400200
B74 1400100
B74 1600100
B7404OO1OO
B7405OO1OO
B64 1000100
B740200 100
B740800400
B740800700
B743800200
B743800300
B776701
201
NOTES: 1. The tool marked ● is used when attaching the E-ring (2.3 mm).
2.0 = Commercially available tool
3.
@
=
EPSON exclusive
tool
Table 4-2. Measuring instruments
Description
Specification
Class
Oscilloscope
50 MHz
A
Tester
A
Slide calipers
A
Multi meter
B
Logic Analyzer
B
NOTE: A =
Mandatory, B = Recommended
After printer disassembly, assembly, and adjustment, be sure to perform lubrication,
adhesive
application, cleaning, and maintenance as indicated in Chapter 6, in order to maintain optimal printer
performance.
4-1
- TECHNICAL MANUAL 1
- PRECAUTIONS 3
- REVISION SHEET 5
- TABLE OF CONTENTS 6
- CHAPTER 1 7
- GENERAL DESCRIPTION 7
- FEATURES 9
- 1.2 INTERFACE 11
- 1.3 SPECIFICATIONS 14
- 1.4 OPERATING CONTROLS 20
- Middle and 21
- 1.5 MAIN COMPONENTS 26
- CHAPTER 2 30
- OPERATING PRINCIPLES 30
- 2.1 GENERAL 33
- MODEL-3A1O PRINTER MECHANISM 34
- (MAIN BOARD) 34
- 2.3 POWER SUPPLY CIRCUIT 35
- 2.3.2 Regulator Circuit 37
- 2.4 CONTROL CIRCUIT 41
- (ControIl 46
- 1. Address latch 47
- -“’’’’’’’’’’’’’;’’’”:l 51
- *m(cN2pin’3) 54
- 2.4.6 Paper Feed Motor 59
- ~---vuvu 61
- 61
- EPSON LX-800 62
- 2.4.8 Print Timing Control 66
- 4,,1<,1 68
- 2.5.1 Sensor Mechanism 69
- Carriage Guide Shaft 70
- Paper Feed Motor 72
- Breaking 74
- CHAPTER 3 75
- OPTIONAL EQUIPMENT 75
- 3.1 GENERAL 76
- 3.2 OPTIONAL INTERFACES 76
- CHAPTER 4 77
- ISASSEMBLY, ASSEMBLY, AND 77
- ADJUSTMENT 77
- 4.2 DISASSEMBLY AND ASSEMBLY 82
- 4.2.2 Removal of Cases 83
- Flat Spring 92
- , Platen 92
- Platen Gear 92
- Carriaga Guide 93
- Shaft Ground 93
- Sprocket Shaft 98
- Guide Roller’ 98
- Sprocket Wheel 98
- 4.3 ADJUSTMENT 99
- ,’v?,?la 100
- CHAPTER 5 101
- TROUBLESHOOTING 101
- LIST OF FIGURES 101
- LIST OF TABLES 101
- ‘ARN’NG~ 102
- I printer mechanism 104
- Set the gap-adjustment lever 107
- Printhead 111
- 5.3 UNIT REPAIR 112
- ● The l/F cable is 113
- Solution 113
- 5.3.2 Printer Mechanism 115
- ● Replace the 116
- ● Resistance value: 117
- ● Sheet load 118
- ● Remove any 118
- CHAPTER 6 120
- MAINTENANCE 120
- 6.1 PREVENTIVE MAINTENANCE 121
- Adhesive Application Point 122
- No. of Point 122
- APPENDIX 124
- A.1 PRINCIPAL 126
- SPECIFICATIONS 126
- Fig. A-2. wPD7810/7811 Block 128
- E05A03BA 132
- (E05A03CA) 132
- Gate Array 132
- Memory Ce I 134
- A.1.4 494 Regulator IC 135
- A.1.5 7407 137
- Fig. A-1 2. 7407 Pin Diagram 137
- A.2 SCHEMATICS AND DIAGRAMS 138
- Fig, A-15 139
- Board Component Layout 139
- in Japan 142
- 87.07 -.6 142
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