Epson FX-870/1170 User Manual Page 59
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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Troubleshooting
Problem Isolation
Most printer problems can be corrected by replacing the defective unit. First, identify the
problem from the symptoms you observe using the table below. Then, follow the instructions in
the corresponding flowchartto correct the problem.
Table 3-8. Symptoms and Flowchart References
Flowchart
Symptom
Possible Problems .
or Solution
Printer dead, or abnormal l Possible power supply voltage problem.
See
operation at power on.
l
A motor or printhead may be shorted.
Chart 1.
. CO94 MAIN board may be bad.
Carriage does not move, or
l
Something in the mechanism may be catching.
See
carriage operation abnormal.
l
Sprocket or ribbon driie gears may be stuck or broken.
chart 2.
l
CR HOME sensor may be bad.
l
Carriage motor may be bad.
l Driver for CR on CO94 MAIN board may be bad.
Paper does not feed, or l Something in the mechanism may be catching.
See
paper feeds abnormally.
l Paper feed motor may be bad.
Chart 3.
l
Drier
for PF on CO94 MAIN board may be bad.
Self-test printout has poor
l
Platen gap may be incorrect.
quality.
l
Printer may need bidirectional adjustment.
See
l Head cable may be bad.
Chart 4.
l Printhead may be bad.
l
Printhead
drivers
on CO94 MAIN board may be bad.
Printing is darker on one
l
Platen may not bs parallel to carriage guide shaft.
Perform platen
side of the page than on
gap adjustment.
the other side.
Printing is intermittently
l Ribbon may be bad.
dark and light.
l Ribbon mask may be damaged.
See
l Sprocket or ribbon drive gears may be stuck or broken.
Chart 5.
l Platen gap may be incorrect.
Data from the host is
l
Printer default settings may be wrong for application.
printed incorrectly. (Host is
l
Interface cable may have a problem.
See
assumed to have checked
l
Software settings may be incorrect for printer.
Chart 6.
out OK
with
another printer.)
l
Possible problem with ROM or CO94 MAIN board.
-,
-_
3-6
Epson FX-8700170
- FX-870/1170 1
- FCC Compliance Statement 2
- Copyright Notice 3
- Trademarks 3
- Precautions 4
- How to Use this Manual 5
- EptmnFX-870/1170 6
- Numbers and Addresses 7
- Contents 8
- Removing the Panel Unit 9
- Printer Features 10
- List of Figures 11
- List of Tables 11
- 80-column model 14
- 136-column model 14
- Hardware Specifications 15
- FX-8700170 20
- 0.12” (3.0 mm) or more 22
- EpsonFX-870/1170 22
- Epson FX-8700170 24
- Interfaces 25
- Control Panel 29
- Default Settings 32
- Position 1 (3rd step) 37
- Printer Initialization 38
- Table 1-21. Buzzer Functions 39
- Main Components 40
- ,,DAld-lfil-l 41
- Epson FX-87011170 42
- Housing Assembly 44
- Chapter 2 48
- Site Requirements 49
- The Correct Power On Sequence 49
- Parallel Cables 50
- Serial Cables 50
- Serial Cable 51
- Tips to Increase Printer Life 52
- Troubleshooting 53
- Troubleshooting 3 54
- Table 3-2. Sensor Test Points 55
- Error Codes 58
- Problem Isolation 59
- Serial Communications Errors 60
- Possible Cause 61
- 3-10 Epson 63
- Self-Test 66
- Chart 6. Data 68
- Host is Printed Incorrectly 68
- FX-870/i 70
- Connector Locations 71
- Sensor Locations 72
- Figure 3-5. Platen Gap Sensor 73
- Disassembly and Assembly 78
- Disassembly and Assembly 4 80
- Service Checks After Repair 81
- Screw Specifications 82
- Removing the Printhead 86
- Removing the 87
- Insertion 93
- Printer Mechanism 97
- Arranging the Cables 100
- Disassembly 103
- Assembly 103
- Epson FX-870/1170 103
- Adjustments, Maintenance, and 105
- Lubrication 105
- Platen Gap Adjustment 106
- Preventive Maintenance 110
- Table 5-2. Lubrication Points 111
- Principles of Operation 113
- Carriage Mechanism 118
- Paper Handling Mechanisms 120
- Ribbon Advance Mechanism 133
- Power Supply Operation 134
- Pfinciples of Operation 135
- Secondary 136
- Control Circuit Operation 137
- E05A66YA (IC4) 139
- FX-87W1170 139
- Sensor Circuits 141
- Carriage Motor Drive Circuit 142
- Printhead Drive Circuit 144
- Parallel Interface Circuit 144
- PROM Control Circuit 145
- CH1=50V TIME=2ps 146
- Reference Materials 153
- Reference Materials 7 154
- Circuit Diagrams 158
- Circuit Diagram 159
- C076 PSB Power Supply Board 160
- CO76 PSB Power Supply Board 161
- Figure 7-6 162
- Figure 7-7 163
- Outline Drawings 166
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