Printronix P7000 Series Maintenance Manual page 199

Symptom
Characters or dots are
missing, smeared, too light,
or too dark. (continued.)
Characters are compressed
on first line of a form
Horizontal misalignment of
characters (Dots or
characters move left or right
from dot row to dot row or line
to line)
Table 6. General Symptom List
12. Power on the printer. If the problem still occurs, replace
the controller board.
Adjust the tension of the tractor belts (page 258).
1. Take the printer offline and print a test pattern of All H's. If
characters shift left or right from line to line, there might be
a proportional spacing problem. If the pattern of H's prints
correctly (that is, all the columns line up), contact your
support group or configuration help desk, because a
configuration change may be necessary. If the pattern of
H's did not print OK, go to the next step.
2. Check the hammer phasing. Adjust hammer phasing if
necessary.
3. Check the dynamic paper tension.
4. Inspect the shuttle frame assembly area for ink residue,
paper chaff, or debris. Clean the shuttle frame assembly.
5. Check the MPU gap. Using a feeler gauge, adjust the gap
between the MPU assembly and the flywheel to 0.010 ±
0.001 inch (0.254 ± 0.025 mm). Torque the 7/16 inch MPU
clamp screw to 18 inch-pounds (2.03 N•m).
6. Power on the printer. Run a print test. If the symptom is not
gone, replace the MPU.
7. Power on the printer. Run a print test. If the symptom is not
gone, replace the controller board.
8. Power on the printer. Run a print test. If the symptom is not
gone, replace the shuttle frame assembly.
General Symptom List
Solution
199