Lexmark 2580+, Руководство по обслуживанию

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2-18
Service Manual
2580+, 2581+, 2590+, 2591+
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Pull Tractor sensor service check
The Pull Tractor sensor detects the tractor in the pull position and disables the load/unload and auto tear-off
functions. A failed sensor may prevent load/unload from functioning, with the tractor in the push position.
Top-of-forms service check
Tractor 2 service check
The Tractor 2 in-place sensor opens during installation when its actuator touches the printer cover.
The Tractor 2 Home sensor detects the position of the slider:
•
When Tractor 2 is selected, the motor-driven Tractor 2 slider pushes the printer sub slider cam lever to
engage the printer gear train, which drives the Tractor 2 tractors.
•
When the Tractor 2 is deselected, the motor retracts the slider, disengages the Tractor 2 gear drive, and
reengages the printer tractors.
10 beeps and blinking Ready, Paper, Font and Pitch LEDs
Tractor 2 Home sensor never made after turning the printer off and then on, or made at the wrong time. (The
same error indication is used for carrier home failure.)
Step FRU Action
1 Pull Tractor sensor With the tractor in the push position, press Load/Unload several times while
alternately holding down and releasing the left pull tractor actuator. The paper
should load and unload when the actuator is not held down, and should not load
or unload when the pull tractor actuator is held down.
If the paper does not move correctly, disconnect J3 from the logic board.There
should be continuity from J3-1 and J3-2 when the left pull tractor actuator is
pressed, and infinite resistance when the actuator is not pressed. Replace the
sensor if necessary.
If the sensor is good but the paper still does not move correctly, replace the logic
board and reset the bidirectional print adjustment. Go to
“Bidirectional print
adjustment” on page 4-3 .
Step FRU Action
1 Top-of-form sensor Check that the Top-of-form sensor and its flag are properly installed and are not
damaged.
2 Logic board Remove the paper and set the Paper Select lever to the cut sheet position, and
turn the printer on.
Measure the voltage between logic board connector J5-2 (TOF signal) and J5-3
(GND). You should receive the following voltage readings:
• When there is paper in the printer, the voltage should be 0 V dc.
• When there is no paper in the printer, the voltage should be 5 V dc.
Replace the Top-of-form sensor if the voltage is incorrect.
Replace the logic board if the voltage is correct, and reset the bidirectional print
adjustment. Go to
“Bidirectional print adjustment” on page 4-3 .