Principles of Operation
Chapter 6
Principles of Operation
Printer Mechanism Operation
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6-1
Printhead Mechanism
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6-1
Carriage Mechanism
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6-3
Platen Gap Adjustment
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6-4
Paper Handling Mechanisms
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6-5
Paper Feed Mechanisms
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6-5
Paper Advance Mechanisms
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6-6
The Release Lever
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6-12
Paper Paths
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6-13
Ribbon Advance Mechanism
..
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6-18
Power Supply Operation
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6-19
Power Supply Overview
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6-19
Power Supply Circuit Operation
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6-19
Control Circuit Operation
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6-22
Control Circuit Operation Overview
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6-22
Reset Circuit
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6-25
Sensor Circuits
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6-26
Carriage Motor Drive Circuit
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6-27
Paper Feed Motor Drive Circuit
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6-28
Printhead Drive Circuit
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6-29
Parallel Interface Circuit
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6-29
E2PROM
Control Circuit
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6-30
Component Repair Information (for Dealers Outside the U.S.)..
6-31
Repairing the C076 PSB Board Assembly
...........................
6-31
Repairing the
C094 MAIN Board Assembly..
......................
6-34
List of Figures
Figure 6-1.
How the Printhead Works
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6-2
Figure 6-2 . Carriage Operation
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6-3
Figure 6-3.
Platen Gap Adjust Lever
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6-4
Figure 6-4.
Friction Advance Operation Using the
Top Paper Entrance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-6
Figure 6-5.
Push Tractor Operation Using the Rear Paper Entrance ........ 6-7
Figure 6-6.
Push Tractor Operation Using the Front
Paper Entrance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-8
Figure 6-7.
Pull Tractor Operation Using the Bottom Paper
Entrance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-9
Epson FX-870/1170
6-i
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