Kodak 800 SERIES - Manual (Page 73)

Maintenance 3-21
NovaJet 800 Series Service Manual
MAINTENANCE
Menu, Service Menu, Test Print) may be used, but this test is a
compressed vector based file and may exhibit certain dithering
properties different from that of another rasterized print.
12. Refer to 'Cartridge Misfires' and 'Ink Dropout' to ensure all other
troubleshooting checks have been made.
13. For single color or multiple color print failures replace the carriage PWA.
If normal test patterns (i.e. Color Test and normal basic test patterns) are
seriously degraded then replace the carriage PWA. Refer to
Disassembly.
14. Inspect and clean stepper motor and lower roller drive gears if printer is
older than 5 years. Other unique causes include synchronization errors
from the stepper drive system due to defects or gear cleanliness.
15. Replace stepper motor for consistently spaced horizontal patterns (2 -
10 mm apart) when printer is run in the best mode with a test print.
Often a lower roller drive noise will accompany the banding. Inspect
stepper motor gearing/lower roller for damage/debris (ensure screws are
tight).
Check stepper motor winding resistance.
16. Check lower roller height for head scrapes on media. Banding will have
jagged or slightly angled lines at the termination points or may even
appear as light cuts in the media (like a utility knife cut the surface of a
print). The normal head height range between the bottom surface of the
cartridges and the platen surface is 0.062" to 0.068". Use the Carriage
Head Height Kit for proper adjustment. Refer to Alignments.
17. Replace the servo motor for horizontal bands (thicker than 2 mm) which
extend beyond the page layout from .5 mm to 20 mm. The servo motor
bearings may be faulty; normal servo motor life is 1600 to 2500 plot
hours. Horizontal bands (0.2 mm to 1 mm) which extend beyond the
page layout are usually caused by the workstation memory or the driver
not having sufficient work space. Ensure 1GB is free on hard drive at all
times; 256 MB of memory is suggested. Partitioning the hard drive is
recommended. Refer to Disassembly.