Printronix L1024, Руководство по обслуживанию

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6–10 Chapter 6 – Paper Feed Subsystem
6.2.1 Mechanical
The four units primarily responsible for positioning and moving media (paper or labels) are:
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The Tension Roller Assembly
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The Drive Gear Assembly
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The Tractor Assembly
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The Lower Paper Guide
6.2.2 Electrical
The electrical portion of the paper feed system consists of the following:
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Drive Gear Assembly. The Stepper Motor of the Drive Gear Assembly is driven by the
Stepper Motors Controller Board.
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Tractor Assembly. The Tractor Stepper Motor is driven by the Stepper Motors Controller
Board.
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Tractor Encoder. The Tractor Encoder Board has two optical sensors that sense the
1/8 inch and 1/16 inch slots in the Encoder Wheels. These pulses are sent to the Engine
Controller Board and are used to monitor and control print location and paper movement.
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Paper Top Sensor (PTOP). This sensor is located at the center rear of the tractor. It is
used to tell the printer when paper is present in the fuser. It is also used to indicate paper
location when paper is being backfed into the printer.
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Paper Empty Sensor. This sensor is located near the entry of the printer and tells the
printer when there is no paper available to be fed in.
Following is a block diagram of the paper motion elements. See Appendix B for a complete electrical
block diagram.