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Maintenance 3-17
NovaJet 800 Series Service Manual
MAINTENANCE
Banding Differences
Consistent horizontal banding is usually hardware related. Normally
horizontal microbanding is caused by improper color deadband or color
calibrations, dirty cartridges or service station. Inconsistent banding is
usually software related. However, electrostatic discharge (ESD) from
media (i.e. Backlit/Duratrans films) can also cause inconsistent horizontal
banding. While minimal microbanding in an image typically occurs due to
cartridge jet failures and clogs, dirty service station or an improper calibra-
tion of the printer, gross microbanding can be caused by a dirty encoder
strip causing image skew or real hardware failures.
Vertical banding is always hardware related. Diagonal banding could be
either hardware or software.
HARDWARE
SOFTWARE
Figure 3-10. Examples of Horizontal Banding.
Hardware banding is usually characterized by consistent banding strips as
shown. Typically horizontal banding is caused by the cartridge or print head
in 95% of the cases. It signifies a slippage in the media’s normal movement
that is possibly due to the stepper motor, lower drive shaft assembly, pinch
rollers, or the rollguides on the back of the printer. All these possible faulty
areas deal with a rotational movement that, if faulty, will generate a consis-
tent banding pattern. The Main PWA and Carriage PWA can also cause
this type of error to occur.
Software banding is characterized by inconsistent banding lines or lines
which violate the page layout (extend beyond the print border). These