Epson LX-850 Specifications Page 153
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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5.3.2 Printer Mechanism Repair
For detailed procedures for replacing
Reassembly”) and 4.4 (“Adjustment”).
,F:’:
+.-
or adjusting parts, refer to Sections 4.3 (“Disassembly and
If a problem or system recurs following an attempted repair, refer back to the Tables above to try to
find other potential causes.
Table 5-5. Printer Mechanism Repair
Problem Symptom
Cause Checkpoint Solution
The carriage The carriage
Foreign
Manually move the timing
Remove any
motor fails to motor completely
substances are
belt to see if this causes
foreign
operate.
fails to activate at lodged in the
the motor to rotate.
substances.
power ON.
gears or
e!swhere
Measure the coil resistance Replace the
in the mechanism.
of the motor.
The
resis-
carriage motor.
The carriage
tance
should be about 11
motor is defective.
ohms.
The carriage does The carriage
The belt pulley is
Check for broken
or
worn
Replace the belt
not operate motor rotates, but
defective.
pulley.
pulley.
normally at power the carriage does
ON (when the
The timing belt is
Check that the timing belt
Reinsert the
not move.
defective.
carriage has been
is correctly inserted into
timing belt.
manually centered
the bottom of the carriage.
prior to power Check for a broken timing
Replace the
ON.)
belt.
timing belt.
The carriage
The carriage
Check whether the carriage
Clean and
moves leftwards a movement is not moves smoothly when
lubricate.
little, then stops.
smooth.
moved manually.
The carriage The home
Use a tester to check the
Replace the home
moves to the left
position sensor is
the home position sensor.
position sensor.
end, then stops.
defective.
Self-test printing
The carriage
The common
Check the connector for
Replace the
FFC.
does not execute.
moves, but no
wires of the
the common wires of the
printing is
printhead
FFC
are
printhead
FFC.
performed.
disconnected.
Printing stops
The paper guide
Check whether the paper
Reset the paper
before the page
plate is not
guide plate is mounted in
guide plate.
end.
correctly
the right position.
positioned.
l.>
,p
. .
5-18
- 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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