IBM 4247-V03, Maintenance Information

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Tractor sensor check and adjustment
Use this procedure when the printer displays a “002/020 FORMS JAM” message that is caused by a forms tractor
sensor.
To verify that the tractor sensor is requesting the message, with the ”002/020 FORMS JAM” message in the
display, open and close the printer top cover. If the carriage does not move across the print line, investigate the
tractor sensor.
The tractor sensor is located under the black cover on each tractor assembly. When the printer is operating
correctly, a light beam between the transmitter and receiver of the tractor is interrupted by the tractor holes in the
forms, as the forms travel through the tractor.
Attention: Do not use T&D07 for this procedure. T&D07 only applies to the paper presence sensors.
When the printer displays a 002/020 FORMS JAM message, examine the tractor for damaged forms.
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If you do find damaged forms in the tractor, go to MAP 0190: Form feed problems to check the forms path.
- or -
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If you do not find damaged forms in the tractor:
1. Look for paper chad inside the tractor sensor. If you find chad:
a. Use a lint-free cloth to wipe the sensor. As a preventative measure, apply anti-static liquid (IBM P/N
2200118) to the sensor, using a lint-free cloth. Consider occasional treatment, if problem recurs.
b. If you find chad, and judge it to be excessive, advise the customer to:
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Frequently clean out the chad.
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Ask the forms supplier to reduce the chad.
2. With the printer turned 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.
Chapter 5. Removals, service checks and adjustments
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