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4. If stray room light is falling on the sensor, close the top printer cover. Printing
or dark colors between the pin feed holes on the back of the form can appear
to the sensor to be a torn form.
5. The forms or tractor holes may be torn. This can be caused by a clinging chad
that is caught in the urge unit. Check the preprocessor to ensure that it is not
causing too much resistance or drag on the forms. Also check the urge unit and
buffer/flipper unit.
6. The forms may have lifted off the tractor pins. Ensure that the tractor holes are
aligned correctly on the tractor pins. Turn the Tractor Control knob as
necessary to ensure that the forms are tight between the tractors.
7. The forms are not flat and tight over the sensor. Ensure that the forms are
positioned correctly in the forms input area. The forms must not twist or tear
when they travel around the input guide, splicing table, and transfer station.
8. If the jam occurs only with one kind of form, especially one that has not been
used before on the printers, the problem may be form-related. Forms that are
unusually heavy or light and forms that have holes or cuts are all likely to
cause jams.
9. If the forms are in a box, ensure that the box does not interfere with form
movement.
Related information:
"Clearing forms jams" on page 230
provides more specific instructions on clearing forms jams.
"Suggestions for preventing jams" on page 245
provides additional suggestions about preventing forms jams.
079A, 0131, 0132 Tension errors
About this task
Symptom: The position of the tension arm is incorrect. The tension arm is in the
down or upper position. This error most often occurs when the tension arm is not
positioned correctly or you are running heavy forms. This error was detected by
the upper tractor jam sensor (Figure 100 on page 270), which is located at the
upper front tractor assembly.
Possible causes and suggested recovery actions:
Procedure
1. The tension arm may be misaligned. The blue mark on the tension arm should
be visible in the guide notch in the transfer station. If necessary, check the
tension arm (see "Checking the tension arm" on page 147).
2. The forms may be slipping at the hot roll. This can be caused by forms that
have absorbed moisture or forms that are smooth or coated.
3. If you are running with high preheat temperatures, or running unusually heavy
forms or narrow forms, the upper or lower tension arm may need adjustment.
4. The forms are not installed correctly or the forms are broken. A double-sheet
feed can also cause this error.
5. If the tension arm drifts up when the vacuum is turned off, there will not be
enough vacuum to hold the form correctly on the preheat platen. If this is the
case, call for service.
6. If the problem occurs after an NPRO, the upper tractor jam sensor may be
dirty. Check it for paper dust or toner buildup and clean it if necessary (see
"Cleaning the transfer station area" on page 269).
Chapter 6. Taking care of problems
225
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