Printronix P7000 Series Maintenance Manual page 201

Symptom
Vertical misalignment of
characters:
1. Dots or characters move
up or down from dot row to
dot row or line to line
2. Incorrect spacing from dot
row to dot row or line to line
3. Characters randomly
compressed and/or enlarged
Table 6. General Symptom List
1. Load paper. Press PAPER ADVANCE and check that
paper feeds smoothly. Press VIEW to verify that paper
moves in both directions. Check the forms thickness lever:
if it is set too loose or too tightly print quality can be
affected. Set the forms thickness lever to match the
thickness of the paper being used.
2. Check the condition and tension of the paper feed timing
belt. Adjust the paper feed timing belt. Replace the belt if it
is damaged.
3. Check the platen gap. Adjust the platen gap.
4. Inspect the tractors and tractor door springs for damage,
excessive wear, and equal door closing tension. If either
tractor is worn, damaged, or exhibits uneven door closing
tension, replace both tractor assemblies.
5. Check the dynamic paper tension.
6. Remove the paper guide assembly or pedestal top cover.
Make sure connector P107/PAPR M is fully seated in
connector J107 on the controller board.
7. Load paper. Power on the printer. Run a print test. If the
problem occurs, replace the paper feed motor.
8. Run a print test. If the problem occurs, replace the
controller board.
9. Run a print test. If the problem occurs, replace the power
supply board.
General Symptom List
Solution
201