IBM 4247 Maintenance Information page 300

11. After changing the microcode module, check the Configuration Parameter values, and proceed with the
Adjustment section of T&D11
Tractor Sensor Check and Adjustment
Use this procedure when the printer displays a '02/002/020 FORMS JAM' message that is caused by a forms
tractor sensor.
To verify that the tractor sensor is requesting the message, with the '02/002/020 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 blue 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&D11 for this procedure. T&D11 only applies to the paper presence sensors.
When the printer displays a '02/002/020 FORMS JAM' message, examine the tractor for damaged forms.
v If you do find damaged forms in the tractor, go to "MAP 0190: Form Feed Problems" on page 101 to check the
forms path.
- or -
v 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:
v Frequently clean out the chad.
v Ask the forms supplier to reduce the chad.
Chapter 5. Removals and Adjustments
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