IBM Infoprint 6500-v05 Maintenance Manual page 195

Symptom
Horizontal misalignment of characters
(Dots or characters move left or right
from dot row to dot row or line to line)
Table 5. General Symptom List
1. Check and adjust hammer phasing.
2. Check the dynamic paper tension.
3. Remove the shuttle frame assembly and place it on a hard, flat surface. Spin the flywheel by hand
and check for binding. The flywheel should spin more than one turn. If it fails this test, replace the
shuttle frame assembly. If it passes this test, inspect the shuttle frame assembly area for ink
residue, paper chaff, or debris and clean the area and components as necessary.
4. Check the shuttle for electrical shorts (page 252).
5. Check the MPU gap. Using a feeler gauge, adjust the gap between the MPU assembly and the
flywheel to 0.010 ± .001 inch (0.254 ± 0.025 mm). Torque the 7/16 inch MPU clamp screw to
18 ± 1 inch-pounds (2.03 ± 0.11 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 shuttle frame
assembly.
8. Power on the printer. Run a print test. If the problem reappears, the controller board or microcode is
suspect. Do the following:
9. Save the printer configuration values. (Refer to the User's Manual .)
10. Clear NVRAM (page 237).
11. Download and install the latest code from IBM First (page 231).
12. Power on the printer in download mode and load flash memory (page 238).
a. If you encounter loading problems, go to the appropriate error code for resolution.
b. If you encounter the failure or message that brought you to this procedure, replace the controller
board (page 319). After replacing the controller board, DO NOT make the printer READY, but
proceed immediately to the next step.
13. Download and install the latest code from IBM First (page 231).
14. Power on the printer in download mode and load flash memory (page 238).
15. If you encounter the failure after replacing the controller board, reinstall the original controller board
and contact your DDS and Second Level Support.
Corrective Action
General Symptom List
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