Epson FX-870

Principles of Operation
Figure 6-8. Push-pull Tractor Operation Using the
Rear Paper Entrance
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6-10
Figure 6-9. Push-pull Tractor Operation Using the
Front Paper Entrance
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6-11
Figure 6-10. Release Lever
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6-12
Figure 6-11. Release Lever Setting Functions
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6-12
Figure 6-12. Paper Path for Friction Feeding Using the
Top Entrance
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6-13
Figure 6-13. Paper Path for Push Tractor Feeding Using the
Rear Entrance
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6-14
Figure 6-14. Paper Path for Pull Tractor Feeding Using the
Rear Entrance
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6-14
Figure 6-15. Paper Path fbr Push-pull Tractor Feeding Using the
Rear Entrance
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6-15
Figure 6-16. Paper Path for Pu11 Tractor Feeding Using the
Bottom Entrance
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6-15
Figure 6-17. Paper Path for Friction Feeding Using the
Front Entrance
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6-16
Figure 6-18. Paper Path for Push Tractor Feeding Using the
Front Entrance
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6-16
Figure 6-19. Paper Path for pull Tractor Feeding Using the
Front Entrance
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6-17
Figure 6-20. Paper Path for Push-pull Tractor Feeding Using the
Front Entrance
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6-17
Figure 6-21. Ribbon Advance Mechanism
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6-18
Figure 6-22. Power Supply Circuit Block Diagram
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6-21
Figure 6-23. Control Circuit Block Diagram
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6-22
Figure 6-24. Data Flow
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6-23
Figure 6-25. Power On Reset Circuit
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6-25
Figure 6-26. Sensor Circuit Block Diagram
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6-26
Figure 6-27. Carriage Motor Drive Circuit
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6-27
Figure 6-28. Paper Feed Motor Drive Circuit
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6-28
Figure 6-29. Printhead Drive Circuit
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6-29
Figure 6-30. Parallel Interface Circuit
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6-29
Figure 6-31. E2PROM Control Circuit
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6-30
List of Tables
Table 6-1.
Paper Feed Methods
and Paper Entrances
........................ 6-5
Table 6-2.
Ribbon Advance Gear Linkage
.........................................
6-18
Table 6-3.
Power Supply Input Voltage and Fuse Rating..
............... 6-19
Table 6-4.
Power Supply Output Voltages and Applications
............
6-19
Table 6-5.
Functions of Main Components of C094 MAIN
...............
6-24
6-ii
Epson FX-870/1170