Paper Path Service Checks - IBM 4247 Maintenance Information

2. With the printer powered on, look at the back of the tractor sensor. In a darkened room, you should be able to
see the red dot of the light emitting diode (LED). If the LED is not lighted, verify that the tractor is plugged
correctly into the electrical socket. If you determine the mechanical connection is adequate but the LED is not
lighted, replace the tractor assembly.
3. Verify the sensor can read the tractor holes in the forms.
a. Mount forms onto the tractor pins.
b. While holding the paper in place, advance the forms by hand cycling the upper feed roller.
c. Ensure the sensor is positioned so the LED light passes through the tractor holes.
d. If adjustment is indicated, loosen and retighten the sensor.
e. If adjusting the sensor does not correct the condition, replace the tractor assembly.

Paper Path Service Checks

Main Paper Drive Check and Adjustment
1. Power off (O) the printer.
2. Check the paper bail setting.
The paper bail is removed from the printer when the rear pull forms path is used.
When the paper bail is installed, ensure that it is as shown here.
Chapter 5. Removals and Adjustments
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