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Figure 4-34. Defective Carriage PWA (Color Test).
15. Inspect and clean stepper motor and lower roller drive gears if
printer is older than 5 years. (Every two years if printer is used
for textile printing.) Other unique microbanding causes include
synchronization errors from the stepper drive system due to
defects or gear cleanliness.
Figure 4-35. Defective Stepper Motor.
16. Replace stepper motor for consistently spaced horizontal
patterns (2 - 10 mm apart) when printer is run in the enhanced
modes 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 (7.2-8.0 ohms; check full
360-degree rotation)
NovaJet 800 Series Service Manual
Troubleshooting
4-37
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