IBM Infoprint 6500-v05 Maintenance Manual page 198

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 5. General Symptom List
1. Load paper. Press FORM FEED 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 and adjust the paper feed timing belt. Replace the belt if it is damaged.
3. Check and adjust the platen gap.
4. Check and adjust the dynamic paper tension (page 384).
5. Check and adjust the tractor belt tension (page 387).
6. Check for heavily tented horizontal perforations in the paper. If horizontal perforations are heavily
tented, consider setting the "Set Platen at BOF" configuration option (in the Printer Control menu) to
Open. (Refer to the User's Manual .)
7. 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.
8. 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.
9. Power on the printer. Load paper. Run a print test. If the problem occurs, replace the paper feed
motor.
10. Check the shuttle for electrical shorts (page 252).
11. Power on the printer. Run a print test. If the problem occurs, the controller board or microcode is
suspect. Do the following:
12. Save the printer configuration values. (Refer to the User's Manual .)
13. Clear NVRAM (page 237).
14. Download and install the latest code from IBM First (page 231).
15. 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.
Corrective Action
General Symptom List
198