Instruction manual

The Procedures
59
connector P107/HBF for shorts or opens. (Refer to the Main Wire
Harness Test Tables in Appendix A.)
Replace components that fail test.
3. Make sure P107/HBF has a good connection at J107 on the CMX
controller board.
Connect P107 to the CMX controller board.
4. Inspect for obstructions of airways and vents.
Remove obstructions.
5. Power on the printer.
If the message appears, replace the CMX controller board. Record
the message and return it with defective CMX board.
Horizontal misalignment of characters (Dots or characters
move left or right from dot row to dot row or line to line
1. If dots between alternate dot rows are misaligned, check the hammer
phasing.
Adjust hammer phasing.
2. If the printer is a P5X05 model (i.e., a 475 or 500 lpm model), check the
shuttle speed setting.
Set the shuttle speed (page 135).
3. Inspect the shuttle frame assembly area for ink residue, paper chaff, or
debris.
Clean the shuttle frame assembly.
4. 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).
5. Power up the printer. Run a print test.
If the symptom is not gone, replace the MPU.
6. Power up the printer. Run a print test.
If the symptom is not gone, replace the CMX controller board.
7. Power up the printer. Run a print test.
If the symptom is not gone, replace the shuttle frame assembly.
ILL EXT BUS ACC* Message
1. Illegal External Bus Access. Firmware error on the CMX controller board.
Cycle power. Run the print job again. If the message appears,
download the emulation software again (page 130).
2. Cycle power. Run the print job again.