Printronix L1024, Maintenance Manual

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6–29 Chapter 6 – Paper Feed Subsystem
TRACTOR ASSEMBLY REMOVAL
6. Loosen the Tractor Drive Shaft by removing 1 E-ring from the left end of the Shaft and sliding
the Bushing off of the Shaft.
NOTE: Do not remove the Spring Pin from the right end of the Shaft.
7. Slide the Shaft to the right so that the Bushing is clear of the Frame.
8. Loosen the Guide Shaft by removing 1 Screw from each end of the Shaft.
9. Loosen the Rear Guide Shaft by removing 1 E-ring and Bushing from each end of the Shaft.
10. The Tractor Assemblies and Shafts can now be removed from the Frame by lifting them out.
It may be necessary to release the ends of the Guide Shaft from the Tractor Frame by gently
pulling the ends of the Frame.
NOTE: Upon assembly, the ends of the Guide Shaft must be aligned with the holes
in the ends of the Tractor Frame.
11. The Centering Gear can be removed from the Tractor Frame by removing 1 E-ring.
12. Remove the Shafts from the Tractor Assemblies.
NOTE: Upon assembly, the Drive Shaft must be installed so that the Timing Mark
of each Tractor is facing up. This aligns both Tractors so that the Paper
Pins are in the center of the Drive Shaft. The Drive Shaft must be installed
so that the Flat Face for the Encoder Wheel is facing toward the rear of the
printer.
See Detail 6–9.
13. Remove the Centering Arm off of each Tractor by removing 2 Screws.
6.5.2 Reassembly and Replacement
Reverse all of the Steps above as needed.
6.5.3 Adjustment
Adjusting the Tractor Encoder Board moves the first line of print on a page closer to or farther from the
page break perforations. Perform this adjustment only if the original position of the Encoder Board was
not noted during disassembly, or if the registration of the first line is unsatisfactory.
NOTE: This adjustment will correct a misregistration of print when a customer is
using preprinted forms. However, this adjustment will also affect
all stock
printed subsequently.
1. Remove 1 Screw, then remove the Tractor Encoder Cover.
2. Losen, but do not remove, 1 Screw on the Tractor Encoder Board.
See Detail 6–10.